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HP 9483C User's Manual

1. OPERATING AND SERVICE MANUAL DC POWER SUPPLY SCR 10 SERIES MODEL 6483 8 HEWLETT PACKARD O HEWLETT PACKARD CERTIFICATION Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States National Bureau of Standards to the extent allowed by the Bureau s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Hewlett Packard instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Company wiil at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by HP Buyer shall prepay shipping charges to HP and HP shail pay shipping charges to return the product to Buyer However Buyer shall pay ali shipp ng charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programm ing instructions when properly installed on that instrument HP does not warrant that the operation of the i
2. modular or modified mounting normally closed normally open nickel plated order by description outside diameter pico 10 12 printed circuit potentiometer parts per million peak reverse voltage rectifier root mean square silicon single pole double throw single pole single throw small signal slow blow tantulum titanium volt variable wirewound Watt Table 6 3 MANUFACTURER ADDRESS EBY Sales Co Inc Aerovox Corp Sangamo Electric Co S Carolina Div Allen Bradley Co Litton Industries CODE NO 00629 Jamaica N Y New Bedford Mass Pickens S C 01121 Milwaukee Wis 01255 Inc Beverly Hills Calif TRW Semiconductors Inc Lawndale Calif 01281 01295 Texas Instruments Inc Semiconductor Components Div Dallas Texas Manchester N H Rockford Dover Ohio Saugerties N Y 01686 01930 02107 02114 02606 02660 02735 RCL Electronics Inc Amerock Corp Sparta Mfg Co Ferroxcube Corp Fenwal Laboratories Morton Grove Ill Amphenol Corp Broadview 11 Radio Corp of America Solid State and Receiving Tube Div Somerville N J Semiconductor Products Dept Syracuse N Y 03797 Compton Calif 03877 Eldema Corp Transitron Electronic Corp Wakefield Mass Pyrofilm Resistor Co Inc Cedar Knolls N J Arrow Hart and Hegeman Electric Co Hartford Conn ADC Electronics Inc
3. 20 41 43 49 4 11 4 13 4 15 4 17 4 20 4 22 4 26 4 28 4 30 4 31 4 45 4 51 4 53 4 57 4 61 4 63 4 65 4 67 4 70 433 4 78 4 85 Overall Block Diagram Discussion Feedback Loop Current Balance Circuit Turn On Control Circuit Overvoltage Protection Feature Overcurrent Protection Circuit Early Overcurrent Protection Circuit Phase Protection Circuit Overload Circuit Reference Supply Overvoltage Crowbar Detailed Circuit Analysis SCR Regulator and Firing Circuits Constant Voltage Comparator 45 Comparator Protection Circuit 4 6 Constant Current Comparator Error Amplifier Overcurrent Protection Circuit Turn On Control Overvoltage Protection Circuit 4 6 Phase Protection Circuit 47 Early Overcurrent Protection 4 7 Current Balance Circuit 4 7 Overload Circuit 47 Reference Supply 4 8 5 1 5 3 5 5 5 7 5 27 5 35 5 40 5 44 5 49 5 51 5 54 5 56 5 58 5 60 5 62 5 66 5 68 5 70 Introduction Test Equipment Required Performance Test Constant Voltage Tests Constant Current Tests Troubleshooting Overall Troubleshooting Procedure Amplifier Circuits Open Loop Troubleshooting Firing Circuits Open Loop Troubleshooting Crowbar Troubleshooting Repair and Replacement Air Filter Hinged Front Panel Prin
4. 5OmsEC 00 5 yatvours aaa GERM UNLOADING TRANSIENT LOADING TRANSIENT 100 5 2 0 05 Figure 5 5 Transient Recovery Time Waveforms CURRENT SAMPLING TERMINALS TO UNGROUNDED TO GROUNDED TERMINAL OF TERMINAL OF R POWER SUPPLY SANT POWER SUPPLY RESISTOR LOAD TERMINALS Figure 5 6 Current Sampling Resistor Connections 5 27 Constant Current Tests 5 28 The instruments methods and precautions for the proper measurement of constant current power supply 5 5 characteristics are for the most part identical to those already described for the measurement of constant voltage power supplies There are however two main differences first the power supply performance will be checked be tween short circuit and full load rather than open circuit and full load Second a current monitoring resistor is in serted between the output of the power supply and the load 6 29 For all output current measurements the current sam pling resistor is a four terminal meter shunt The load cur rent is fed to the extremes of the wire leading to the shunt resistance while the sampling terminals are located as close as possible to the resistance portion itself see Figure b 6 Recommended sampling shunts are given in Table 5 1 5 30 Rated Output and Meter Accuracy Connect test setup shown in Figure 5 7 b Turn VOLTAGE controls full
5. Bumper Rubber 6 32 Thread 0403 0088 Socket Relay 14 Terminal K1 27 007 0490 0402 Heat Sink A105 5000 6025 Card Extractor 5020 2045 Rollpin Extractor 52 012 062 0250 1480 0059 A2 Firing Board Socket Transistor Control Board Spacer 10 x 375 Standoff 10 32 x 1 000 05 3305 1200 0708 9319 A 194 0 9758 A 1032 0 0380 0471 0380 0728 NOTE resistors are in ohms unless otherwise indicated 8 NOTE These components are applicable to Options 001 and 002 Components will change for Options 003 031 and 032 See applicable Option at rear of Table 6 10 DESCRIPTION MFR PART NO HP PART NO RS Front Panel Assembly Knob Black R1 R4 Spring Meter M1 M2 Bezel Meter 1 2 Coupler Flexible R1 R4 Bracket R1 R4 Mounting Shaft Insulated R1 R4 Insulator R1 Hinge Front Panel Left Hinge Front Panel Right 0370 0026 1460 0256 4040 0297 1500 0299 5000 9323 5020 8038 5020 8039 5000 6280 5000 6281 Bo GROS Qd Rear Panel Assembly Cable Clamp 0100 0407 Fuse Holder FA F8 2110 0397 Panel Rear 5000 6282 AC Terminal Board TB1 0360 1663 Bracket TB1 5000 6283 Mounting Plate TB1 5000 6284 Output Capacitor Tray Tray Capacitor C1 C16 5000 6285 Cover Capacitor Tray 5000 6286 Pan Bottom Right 5000 6291 Busbar 1 16 5000 9328 Main Frame Assembly Eye Bolt 0570 1101 Screw Socket Head 3 4 10 3030 0370 Pan Bottom
6. IMC Magnetics Corp New Hampshire Div Rochester SAE Advance Packaging Inc Santa Ana Calif Ramona Calif Owensboro Ky Chicago Ill 31514 31827 33173 35434 37942 Budwig Mfg Co G E Co Tube Dept Lectrohm Inc Mallory amp Inc Indianapolis Ind Muter Co Chicago 11 42190 43334 New Departure Hyatt Bearings Div General Motors Corp Sandusky Ohio Ohmite Manufacturing Co Skokie Ill Penn Engr and Mfg Corp Doylestown Pa Polaroid Corp Cambridge Mass Raytheon Co Lexington Mass Simpson Electric Co Div of American Gage and Machine Co Chicago Ill Sprague Electric Co North Adams Mass Superior Electric Co Bristol Conn Syntron Div of FMC Corp Homer City Pa Philadelphia Pa New York N Y 44655 46384 47904 49956 55026 56289 58474 58849 59730 61637 63743 Thomas and Betts Union Carbide Corp Ward Leonard Electric Co Mt Vernon Y Code List of Manufacturers Continued CODE MANUFACTURER ADDRESS 70563 Amperite Co Inc Union City 1 70901 Beemer Engrg Co Fort Washington 70903 Belden Corp Chicago Ill 71218 Bud Radio Inc Willoughby Ohio 71279 Cambridge Thermionic Corp Cambridge Mass 71400 Bussmann Mfg Div of McGraw amp Edison Co St Louis Mo 71450 CTS Corp Elkhart Ind 71468 I T T
7. 1525 1825 0 0 1005 4715 Type CEA 7 0 Type CEA 0 1325 425 2725 1815 6215 1035 3035 1535 4335 425 425 0 0 1025 3315 7535 0 1055 100 4 425 0 0 1025 3315 7535 Type CEA 0 EB 1055 Type CT 100 4 EB 2025 Type CEA T 0 EB 1045 EB 1025 Type CEA T 0 HP PART NO 0686 1015 0698 5087 0686 1025 0686 3935 0686 1035 0811 1671 0686 2425 0686 1525 0686 1825 0698 5088 0757 0441 0811 1934 0686 1005 0686 4715 0698 5088 0698 5087 0686 1325 0698 3644 0686 2725 0686 1815 0686 6215 0686 1035 0686 3035 0686 1535 0686 4335 0698 3669 0698 3609 0757 0288 0757 0440 0686 1025 0686 3315 0686 7535 0757 0446 0686 1055 2100 0896 0698 3609 0757 0288 0757 0440 0686 1025 0686 3315 0686 7535 0757 0446 0686 1055 2100 0896 0686 2025 0757 0457 0686 1045 0686 1025 0757 0436 RS REF DESIG DESCRIPTIONT 1 131 R133 134 R135 R137 R138 R139 R141 R142 R143 R144 8145 8 46 8 C11 C12 C13 C14 C15 C21 C22 C23 C24 C25 CR1 2 CR3 CR4 CR5 CR6 7 CR11 12 CR13 CR14 t NOTE 8 NOTE var ww 2k 596 Single Turn fxd ww 400 5 10W 30ppm 9C fxd comp 750 5 fxd met oxide 620
8. 5 9 avoid mutual coupling effects each monitoring device must be connected to the sensing terminals by a separate pair of leads Twisted pairs or shielded two wire cables should be used to avoid pickup on the measuring leads The load resistor should be connected across the out put busbars as close to the supply as possible When mea suring the constant voltage performance specifications the current controls should be set well above at least 1096 the maximum output current which the supply will draw since the onset of constant current action will cause a drop in output voltage increased ripple and other performance changes not properly ascribed to the constant voltage oper ation of the supply CAUTION Never connect a load or a short to the and output or sensing terminals located on the rear terminal strips This causes the heavy load cur rent to flow through the P C Board tracks and consequent damage to the P C Board Loads must always be connected to the busbars Exercise caution when checking out any 10kW unit since high potentials are provided by the unit Rubber gloves are recommended to protect against shock hazard 5 10 Voltage Output and Voltmeter Accuracy To check the output voltage proceed as follows a Connect load resistor indicated in Figure 5 2 across output busbars b Connect differential voltmeter across S and S ter minals of supply observing correct polarity c Turn
9. AI AD 6 AS Ad 45 5 A2 AL AO lel lelelele Figure 3 7 Remote Sensing another factor that must be considered is the inductance of long load leads This causes a high ac impedance and could affect the stability of the feedback loop seriously enough to cause oscillation If this is the case it is recommended that the following actions be taken Adjust equalization control A1R48 to remove os cillation or to achieve best possible transient response for given long load lead configuration Refer to Paragraph 5 88 for discussion of transient response measurement b performing adjustment in step a above does not remove oscillation connect a capacitor having similar char acteristics to those of the output capacitors C1 C2 etc used in the supply directly across load using short leads Readjust equalization control R48 as in step a above after making this change 3 44 Although the strapping patterns shown in Figures 3 3 through 3 6 employ local sensing it is possible to operate power supply simultaneously in the remote sensing and re mote programming modes 3 45 Auto Parallel Operation Figure 3 8 3 46 Two maximum SCR 10 power supplies can be con nected in an Auto Parallel arrangement to obtain an output current greater than that available from one supply Auto Paraliel operation permits equal current sharing under all load conditions and allows
10. In rare instances it may be necessary to readjust the transi ent recovery potentiometer A1R48 if the supply shows signs of oscillating Besides these adjustments certain com ponents must be removed or changed refer to replaceable 2 3 parts list 2 32 REPACKAGING FOR SHIPMENT 2 33 To insure safe shipment of the instrument it is recom mended that the package designed for the instrument be used The original packaging material is reusable If it is not available contact your local Hewlett Packard field off ce to obtain the materials This office will also furnish the address of the nearest service center to which the instrument can be shipped Be sure to attach a tag to the instrument specifying the owner model number full serial number and service re quired or a brief description of the trouble SECTION Hl OPERATING INSTRUCTIONS CAUTION kor BOJKOT REMOVE FILTER WHILE UNIT Figure 3 1 Front Panel Controls and Indicators Typical SCR 10 Supply 31 TURN ON CHECKOUT PROCEDURE 3 2 The following checkout procedure describes the use of the front panel controls and indicators Figure 3 1 and ensures that the supply is operational a Set LINE ON switch Q to on and observe that pilot lamp 2 lights b After turn on delay period see NOTE rotate CURRENT controls fully clockwise and adjust VOLTAGE controls to obtain desired output voltage on voltmeter 3 1 NOTE The s
11. Cannon Electric Inc Los Angeles Calif 71590 Globe Union Inc Centralab Div Milwaukee Wis 71700 General Cable Corp Cornish Wire Co Div Williamstown Mass 71707 Coto Coil Co Inc Providence 71744 Chicago Miniature Lamp Works Chicago Ill 71785 Cinch Mfg Co and Howard B Jones Div Chicago Ill 71984 Dow Corning Corp Midland Mich 72136 Electro Motive Mfg Co Inc Willimantic Conn 72619 Dialight Corp Brooklyn 72699 General Instrument Corp Newark N J 72765 Drake Mfg Co Harwood Heights Ill 72962 Elastic Stop Nut Div of Amerace Esna Corp Union N J 72982 Erie Technological Products Inc Erie 73096 Hart Mfg Co Hartford Conn 73138 Beckman Instruments Inc Helipot Div Fullerton Calif 73168 Fenwal Inc Ashland Mass 73293 Hughes Aircraft Co Electron Dynamics Div Torrance Calif 73445 Amperex Electronic Corp Hicksville N Y 73506 Bradley Semiconductor Corp New Haven Conn 73559 Carling Electric Inc Hartford Conn 73734 Federal Screw Products Inc Chicago Ill 74193 Heinemann Electric Co Trenton N J 74545 Hubbell Harvey Inc Bridgeport Conn 74868 Amphenol Corp Amphenol RP Div Danbury Conn 74970 E F Johnson Co Waseca Minn 75042 IRC Div of TRW Inc Philadelphia Pa 75183 Howard Jones Div of Cinch Mfg Corp New York N Y 75376 Kurz and Kasch Inc Dayton Ohio 75382 Kilka Electric Co
12. REFER TO TEXT BUS BUS Figure 3 4 Remote Resistance Programming Constant Voltage Unity Gain 3 4 3 31 Voltage Programming Unity Gain Figure 3 4 Em ploy the strapping pattern shown in Figure 3 4 for voltage programming with unity gain In this mode the output voit age will vary in a 1 to 1 ratio with the programming voltage reference voltage and the load on the programming voltage source will not exceed 20 microamperes 3 32 To prevent the internal programming current from flowing to terminal A2 and into the external voltage source a jumper strap on P C Board A1 must be removed see Fig ure 7 1 for location of the jumper Be sure to reconnect this jumper before converting the unit to a different oper ating mode 3 33 The output voltage of this supply cannot be voltage programmed with gain unlike some of the other HP supplies 3 34 Remote Programming Constant Current 3 35 Either a resistance or a voltage source can be used to control the constant current output of the supply The CURRENT controls on the front panel are automatically disabled by the following procedures 3 36 Resistance Programming Figure 3 5 In this mode the output current varies at a rate determined by the con stant current programming coefficient given in Specifica tions Table 1 1 The programming coefficient is determined by the constant current programming current which is ad justed to within 2 at the
13. at the rear of the manual 35 NORMAL OPERATING MODE 3 6 The power supply is normally shipped with its rear terminal strapping connections arranged for constant volt age constant current local sensing local programming single unit mode of operation This strapping pattern is shown in Figure 3 2 The operator selects either a constant voltage or a constant current output using the front panel controls programming no strapping changes are necessary 37 Constant Voltage 3 8 select a constant voltage output proceed as fol lows a Turn on power supply and adjust VOLTAGE con trols for desired output voltage with output terminals open b Short circuit output terminals and adjust CUR RENT controls for maximum output current allowable current limit as determined by load conditions If a load change causes the current limit to be exceeded the power supply will automatically cross over to constant current output at the preset current limit and the output voltage will drop proportionately In setting the current limit al lowance must be made for high peak currents which can cause unwanted crossover Refer to Paragraph 3 63 3 2 AIS AIZ AII AS AB AT 6 5 4 5 5 A2 M yl ple Figure 3 2 Normal Strapping Pattern 3 9 Constant Current 3 10 To select a constant current output proceed as fol lows Short circuit output terminals
14. recovery in constant voltage operation to within 12V 5V of the nominal output voltage following a load change from full load to half load or vice versa NOTE 2 METERS A front panel voltmeter 0 700V and ammeter 0 30A are provided Accuracy is 296 of full scale RESOLUTION Constant Voltage 60mV is the minimum output voltage change that can be obtained with the front panel controls Constant Current 25mA is the minimum output cur rent change that can be obtained using the front panel controls REMOTE RESISTANCE PROGRAMMING Constant Voltage 300 ohms volt Accuracy 2 All programming terminals are on a rear barrier strip Constant Current 40 ohms ampere Accuracy 296 All programming terminals are on a rear barrier strip COOLING Forced air cooling is employed by means of an inter nal fan WEIGHT 500 Ibs net 555 Ibs shipping SIZE 16 3 4 W x 26 1 4 x 26 1 8 D The unit can be mounted in a standard 19 rack panel NOTES 1 Specifications apply only when a supply delivering more than 596 of maximum rated output voltage CV opera tion or 5 of maximum rated output current CC operation and b load is drawing more than 100W Restriction b is lifted when supply is delivering more than 3096 of maximum rated output voltage CV operation or 3096 of maximum rated output current CC operation 2 For operation with a 5
15. 5 44 CHECK SCR S CR4 CRS AND CRG AND DIODES CRI CR2 AND CR3 FOR SHORT OUTPUT FALLS OvOLTS OUTPUT NORMAL OUTPUT VOLTAGE 10 VOLTAGE GOES TO CURRENT HALF SCALE ATTEMPT PRO FAULTY CONSTANT GRAM OUTPUT BY SET CURRENT AMPLIFIER TING CURRENT CON CKT 60 TO PARA TROL TO MID RANGE 5 47 OBSERVE FRONT PANEL METERS OUTPUT QUTPUT VOLTAGE QVOLTS 3 FLOW 10 FRONT PANEL LESS FRONT GUTPUT VOLTAGE TROUBLE PANEL TROUBLE GOES HIGH LAMPS OUT LAMPS OUT FULL SCALE HF QUTPUT O VOLTS TROUBLE IN INPUT CHECK FUSES Ft SECTION OF THRU REAR AMPLIFIER CKTS OF SUPPLY GO TO PARA 5 44 TROUBLE LAMPS ON OVERCURRENT TEMP OR CROWBAR OBSERVE FRONT PANEL TROUBLE LAMPS BOTH OVER CURRENT PROTECT ANO CROWBAR OPTIONAL LAMPS ON CROWBAR 006 ONLY HAS FIRED ISOLATE TROUBLE TO OVERTEMP BLOWN OK AME MEASURE 06 VOLT 17105600 AIR AGE BETWEEN FILTER AITPE AND TER 2 INOPERATIVE FUSE 5 FAULTY OVERLOAD CHECK FOR SHORT MINAL AT COOLING FAN EXCESSIVE LINE EITHER CROWBAR CKT V 3 THERMAL SWITCH CURRENT CAUSED BY OR MAIN POWER SUPPLY OPEN LINE TRANSIENT BY DISCONNECTING FROM SOURCE OR TROUBLES IN BOTH FIRING AND EARLY OVERCURRENT PROTECTION TEST FIRING
16. CURRENT controls fully clockwise d Turn on supply and adjust VOLTAGE controls until front panel meter indicates exactly maximum rated output voltage Differential voltmeter should indicate maximum rated output voltage 296 5 11 Load Regulation Definition The change AEQUT the static value of dc output voltage resulting from a change in load resistance from open circuit to a value which yields maximum rated output cur rent or vice versa 5 12 To check the constant voltage load regulation pro ceed as follows a Connect test setup shown in Figure 5 1 b Turn CURRENT controls fully clockwise Turn on supply and adjust VOLTAGE controls un til front panel meter indicates exactly maximum rated out put voltage d Read and record voltage indicated on differential voltmeter Disconnect load resistor f Reading on differential voltmeter should not vary POWER SUPPLY RL CHMS UNDER TEST DIFFERENTIAL VOLTMETER Figure 5 1 Constant Voltage Load Regulation Test Setup from reading recorded Step d by more than Modet Variation mVdc 6464C 9 6466C 14 6469C 23 6472C 132 6475C 155 6477C 200 6479C 250 6483C 400 5 13 Line Regulation Definition The change AEQUT in the static value of dc output voltage resulting from a change n ac input voltage over the specified range from low line to high line or from high line to low line 5 14 To check the line regula
17. OPTION A85 OPTION X95 lt lt 06483 60005 E 5000 6292 5000 6293 5000 6294 5000 6300 E 5000 9320 5000 9331 5000 6282 5000 6284 5000 6290 5000 9330 5020 8021 5020 8022 5000 6285 5000 6286 5000 6289 5020 8037 A 5000 9324 ERRATA Throughout the manual change the designation for the internat overvoltage protection crowbar from option 006 to option C011 Manual Changes Mode 6483C Manual HP Part No 06483 90003 Page 3 ERRATA Insert the following CAUTION notice after paragraph 3 45 Auto Paralle Operation CAUTION Ensure that the resistances of the load leads connections for each supply are equal replaceable parts table change HP Part No of pilot lamp DS1 to 1450 0566 Add the following to the Ordering Additional Manuals paragraph in Section Effective December 1975 extra manuals may be obtained by specifying Option 910 when ordering your instrument The number of extra manuals depends upon the quantity of Option 910s ordered Make the following corrections to paragraph 5 46 Change the first sentence of step f to Voltage should read 2 to 4 volts with VOLTAGE controls fully ccw Change the first sentence of step h to Voltage should read 5 to 9 volts with VOLTAGE controls fully rM CHANGE 6 Option 031 380 and Option 032 400 instruments fan transformer
18. PARA 5 49 AND CHECK AI02 03 RA OR CRI9 FOR OPEN GATE LEADIS TO CROWBAR SCRIS ON 2 BOARD AND OBSERVING FRONT PANEL METERS OUTPUT VOLTAGE GOES HIGH FULL SCALE HIGH OUTPUT CONDITION GO TO THIS SYMPTOM AT TOP LEFT DRAWING OUTPUT VOLTAGE ABNORMAL NORMAL 38 TO TROUBLE IN SCR TROUBLE FIRING CKT 60 TO AMPLIFIER 60 PARA 5 49 TO PARA 5 44 HALE SCALE LOW APPENDIX Figure 5 8 Overall Troubleshooting Tree 5 8 5 44 Amplifier Circuits Open Loop Troubleshoot ing 5 45 The following paragraphs test the amplifier portion of the feedback loop Except for the front panel controls all of the circuitry involved is located on the amplifier P C Board A1 The overall test is divided into three separate sub tests constant voltage comparator constant current comparator and error amplifier All tests are performed with the feedback loop opened jumper R149 removed see Figure 7 1 for location and no load connected to the sup ply 5 46 Constant Voltage Comparator To test the CV com parator circuit A1U1 and associated components proceed as follows a Strap the rear terminals for normal operation Fig ure 3 2 except remove jumper straps between S and A7 A8 b Connect external battery and resistors as shown in Figure 5 9 A D size flashlight cell is adequate for this test c Before turning on supply connect dc volt
19. a manner as to provide a taper charge for the last portion of the charge cycle The value of this resistance is the difference between the full charge voltage and the voltage at which the tapering is to start divided by the maximum charging current 3 58 Battery Discharging 3 59 Automatic constant current unattended discharging of a battery using the SCR 10 Series requires certain changes in the strapping configuration on the rear barrier strip as illustrated in Figure 3 11 Also a jumper strap on P C Board A1 must be removed see Figure 7 1 for loca Removal of this jumper ensures that the internal pro gramming current does not flow into terminal A2 Before operation the user should make sure that the interconnect ing leads between supply and battery are secure and cannot become opened 3 60 The supply initially operates in constant current mode at the value set by the current control When the battery voltage is high the supply output voltage will be low and as the battery discharges the supply output voltage increases A constant voltage is maintained across Rx constant cur rent through Rx This condition will prevail until the bat tery voltage drops to zero At this point the supply will switch off and no more current will flow through Rx Diode CRp protects the supply against reverse voltages As shown on Figure 3 11 Rx must be selected so that its IR drop is less than the maximum rated output of the supply yet grea
20. across the output AI AIO A9 AG AS Ad 5 S d AS Al A 91 MASTER SR gt EELEE ASA4 5 5 A3 A2 AQ SLAVE 151 9 8 A7 AG NOTE JUMPER STRAP ON PC BOARD Al MUST BE REMOVED FOR AUTO SERIES OPERATION REFER TO TEXT Figure 3 9 Auto Series Operation of each supply prevent internal damages that could occur from reverse voltages if one supply is turned on before the other On six models in the SCR 10 Series current limiting resistors are required Values and part numbers for the re sistors and diodes are given in the chart below Model CRS Commercial HP Part No RS Value 6464C A295F 1901 0336 Not required 6466C 90 1901 0335 Not required 6469C A90A 1901 0338 0 022 6472C 1N3289 1901 0307 0 039 6475C 1N1187A 1901 0320 0 080 6477C 53270 1901 0326 0 202 6479C 53270 1901 0326 0 250 6483 53270 1901 0326 0 750 3 52 When the center tap of an Auto Series combination is grounded coordinated positive and negative voltages result This technique is commonly referred to as rubber banding and an external reference source may be employed if de sired Any change of the internal or external reference source e g drift ripple will cause n equal percentage change the outputs of both the master and slave supplies This feature can be of considerable
21. allow ing it to light 4 26 Reference Supply 4 27 The reference supply provides regulated bias voltages which are used by the internal circuitry throughout the main power supply of the voltages shown are regulated except for the 24V 4 28 Overvoltage Crowbar Optional Circuit not available for Model 6464C 4 29 A built in overvoltage crowbar protection circuit Option 006 can be ordered with any power supply in the SCR 10 Series with the exception of Model 6464 This cir cuit monitors the output voltage of the supply and fires an SCR if the output voltage exceeds a preset and adjustable threshold The conducting SCR effectively short circuits the supply reducing the output to near zero volts Complete de tails concerning the Option 006 crowbar circuit are given in Appendix A 4 50 DETAILED CIRCUIT ANALYSIS See Schematic Figure 7 7 4 31 SCR Regulator and Firing Circuits 4 32 The SCR regulator operating in conjunction with the firing circuits controls the amount of ac power applied to the primary of the power transformer Each of the three in put phases arbitrarily designated and has an SCR and firing circuit associated with it 4 33 Each SCR conducts upon the simultaneous application of a negative voltage to its cathode input ac and a positive voltage to its gate lead The gate signal firing pulse used to turn on the SCR is a positive going pulse of about 3 5 volts having a duration of
22. casters includes four adjustable screw in feet HP Part No 19099 60860 Change variable resistor ATR102 to 20 1 2W HP No 2100 0558 On page 6 10 change HP Part No of DS2 to 1450 0591 change HP Part No of DS3 to 1450 0590 and on page 6 13 change HP Part No of DS4 to 1450 0591 CHANGE 9 This change adds two rectifier diodes and a Cupron resistor to the output capacitor bank as shown below Their pur pose is to protect the capacitors under short circuit condi t ons The diodes are rated at 35 amps and 1000 volts are HP Part No 1901 0325 and are located on 2 1 2 by 3 1 2 inch aluminum plates 5000 3140 mounted on the capacitor bus bars at the left side of the supply R147 has a resistance of 0 050 ohms is HP Part No 06483 80003 and is located inside the unit directly behind the fan Note The junction of R10 and R11 connects to the negative end of R147 1 5 5 7 9 tl 13 15 RIO Ri47 0 050 C2 4 6 8 10 CHANGE 10 In replaceable parts table Control Board replace current transformer T10 11 with HP Part No 5080 1911 NWidiitidl Uilaliytss WIUUCI Ut Manua Part No 06483 90003 Page 4 Change 11 In the replaceable parts list under Option 003 031 and 032 add the following com ponents R18 R23 100 5 2W HP P N 0698 3620 6 18 23 OluF 20 1kV HP P N 0150 0012 6 C24 5 5 1 HP P N 0160 0904 TO 1 Terminal
23. complete control of the output current from the master power supply The output current Ald NB Ao A9 A8 AT AG AS AG 5 5 A3 A A AO MASTER amp e BUS NS AIO A9 AB A7 AG 216 All APA AO SLAVE s AS A4 4 8US NOTE LEAD LENGTHS FROM AND BUSES ON EACH UNIT TO LOAD Ry SHOULD EQUAL 5 5 Figure 3 8 Auto Parallel Operation of the slave will be approximately equal to the master s out put current regardiess of the load conditions Because the output current controls of the slave are operative they should be set to maximum to prevent the slave reverting to constant current operation this would occur if the master output current setting exceeded the slave s 3 47 Remote sensing and programming can be used though the strapping arrangements shown in Figure 3 8 show local sensing and programming 3 48 Auto Series Operation Figure 3 9 3 49 Two maximum SCR 10 power supplies be oper ated in Auto Series to obtain a higher voltage than that available from a single supply When this connection is used the output voltage of the slave supply varies in accordance with that of the master supply At maximum output volt age the voltage of the slave is determined by the setting of the front panel VOLTAGE controls on
24. damaged or defective should be made inoperative and secured aga nst unintended operation until they can be repaired by qualified service personnel SECTION GENERAL INFORMATION 11 DESCRIPTION 12 This power supply Figure 1 1 is completely transis torized and is suitable for high power applications which re quire a de source with a moderate degree of regulation The supply is a constant voltage constant current type that will furnish full rated output voltage at the maximum rated out put current or can be continuously adjusted throughout most of the output range The front panel CURRENT con trols can be used to establish the output current limit over load or short circuit when the supply is used as a constant voltage source and the VOLTAGE controls can be used to establish the voltage limit ceiling when the supply is used as a constant current source The supply will automatically cross over from constant voltage to constant current opera tion and vice versa if the output current or voltage exceeds these preset limits 1 8 Many protection circuits are included in the supply to protect the regulator SCR s against excessive current or voltage and to protect the user s load The supply also con tains the front panel trouble lamps associated with some of the protection circuits 1 4 Output voltage and current are continuously monitor ed on two front panel meters input power is connected to four pin connector on the re
25. factory If greater programming accuracy is required it may be achieved by adjusting ATR25 as discussed in Paragraph 5 83 The output current of the supply when zero ohms is placed across the programming terminals may be set to exactly zero by adjusting A1R28 as discussed in Paragraph 5 82 3 37 Use stable low noise low temperature coefficient less than 30ppm 9C programming resistors to maintain the power supply temperature coefficient and stability AM AS ADMI A9 AB AT A6 6 SM alelelpig PROGRAMMING RESISTOR AS AG 5 5 2 281212 Figure 3 5 Remote Resistance Programming Constant Current specifications A switch may be used to set discrete values of output current A make before break type of switch should be used since the output current will exceed the maximum rating of the power supply if the switch contacts open during the switching interval CAUTION If the programming terminals A4 and 8 should open at any time during the remote re sistance programming mode the output current will rise to a value that may damage the load If in the particular programming configuration in use there is a chance that the terminals might become open it is suggested that a 1kQ resistor be connected across the programming terminals Like the programming resistor this resistor should be a low noise low temperature coeffi cient type Note that when this res
26. modification J numbers of the instrument Hewlett Packard part number circuit reference des ignator and description To order a part not listed in Table 6 4 give complete description of the part its function and its location Table 6 1 Reference Designators assembly blower fan capacitor 7 circuit breaker miscellaneous electronic part fuse jack jumper z relay z inductor meter diode device signal ing lamp Table 6 1 ac assy bd bkt coef comp CRT CT dc DPDT DPST elect plug transistor resistor Switch transformer terminal block thermal switch Table 6 2 ampere alternating current assembly board bracket degree Centigrade card coefficient composition cathode ray tube center tapped direct current double pole double throw double pole single throw electrolytic encap encapsulated OF fxd farad degree Farenheit fixed germanium Henry Hertz integrated circuit inside diameter incandescent kilo 103 milli 10 3 mega 106 micro 1076 metal mod mtg NC NO NP Reference Designators Continued vacuum tube neon bulb photocell etc zener diode socket integrated cir manufacturer nano 1079 ohm peak to peak cuit or network Description Abbreviations
27. tap is open The secondary windings are con nected as shown on the schematic Figure 7 7 2 25 Transformer 4 is connected in the delta star configu ration shown on Figure 7 7 For 380Vac operation connect tap A1 to tap 380 on the B section tap B1 tap 380 of the C section and tap C1 to tap 380 of the A section The three 400V taps are open 2 26 Transformers A3T1 A3T2 and A3T3 are connected in the delta delta configuration shown on Figure 7 7 For 380Vac operation connect T1 0V to T2 380V 2 to T3 380 and 3 to T1 380V The 400 taps on the three transformers are open 2 27 Transformer Connections for 400Vac Input For a 400Vac input the OV tap on the primary of T5 must be connected to fuse F7 and the 400V tap must be connected to fuse F8 The 380V tap is left open Secondary taps re main connected as shown on Figure 7 7 2 28 For transformer T4 delta star configuration tap A1 is connected to tap 400 on the B section tap B1 is connect ed to tap 400 on the C section and tap C1 to tap 400 on the A section The three 380V taps are left open 2 29 Transformers 1 2 and A3T3 connected in a delta delta configuration as follows 1 to T2 400V T2 0V to T3 400V and 3 to 1 400 The 380 taps on the three transformers are left open 2 30 50Hz Ac Input Option 005 2 31 For operation from a 50Hz source it is necessary to readjust the output ripple as described in Paragraph 5 94
28. to maintain good regulation at the load and reduce the degradation of regulation which would occur due to the voltage drop in the leads between the power supply and the load Remote sensing is accomp lished by utilizing the strapping pattern shown in Figure 3 7 The power supply should be turned off before chang ing strapping patterns The leads from the sensing S ter minals to the load will carry much less current than the load leads and it is not required that these leads be as heavy as the load leads However they must be twisted or shielded to minimize noise pickup 3 42 For reasonable load lead lengths remote sensing greatly improves the performance of the supply However if the load is located a considerable distance from the sup added precautions must be observed to obtain satisfac tory operation Notice that the voltage drop in the load leads subtracts directly from the available output voltage and also reduces the amplitude of the feedback error sig nals that are developed within the unit Because of these factors it is recommended that the drop in the negative load lead not exceed 3 volts If a larger drop must be toler ated please consuit an HP Sales Engineer NOTE Due to the voltage drop the load leads it may be necessary to readjust the current limit in the remote sensing mode 3 43 Observance of the precautions in Paragraph 3 42 will result in a low dc output impedance at the load However
29. voltage of the supply from exceeding 11096 of rating It monitors the output voltage of the supply and if it exceeds the 110 threshold sends hold signal to the firing cir cuits This circuit is seldom activated because the constant voltage comparator prevents the output voltage from ex ceeding the limit established by the front panel VOLTAGE controls However if the constant voltage comparator should the overvoltage protection circuit provides the necessary backup protection 4 15 Overcurrent Protection Circuit 4 16 The overcurrent protection circuit provides backup protection for the constant current comparator being simi lar to the overvoltage protection circuit in this respect The overcurrent circuit monitors the output current IR drop across sampling resistor and generates a signal to the SCR firing circuits if the output current attempts to ex ceed approximately 115 of rating 4 17 Early Overcurrent Protection Circuit 4 18 Further overcurrent protection is afforded by the early overcurrent protection circuit This circuit minimizes output current overshoot during initial short circuit condi tions If the output of the supply is shorted both the line current and the output current attempt to rise The early overcurrent protection circuit monitors the line current phases B and C and generates a turn off signal to the SCR firing circuits if the line current exceeds about 40 of the nominal peak v
30. windings 4 38 Capacitors C1 C11 and C21 between base and emitter of each blocking oscillator transistor prevent spurious trigger ing The base current which flows when the transistors con duct is limited by resistors R3 R13 or R23 connected to each base winding 4 39 Reset Operation At the end of each input line cycle the applicable emitter ramp capacitor C3 C13 or C23 and firir iate dot ts 1 at ven base capacitor C4 C14 or C24 are reset to their starting voltages 12 4y and 11V respectively The resetting oper ation is performed by the positive going rectified waveform received by the firing circuits at TP32 Figure 4 3 input coupled to the ramp and base Capacitors through diodes CR3 CR4 phase CR13 CR14 phase B and CR23 CR24 phase C Reset starts during the negative transition of the reset waveform and the base and emitter capacitors require about 2msec to reach their Starting voltages The ance or line voltage 4 42 The Second input to the firing circuits Consists of the phase B and phase control signals from the current balance Circuit These signals correct for small line to line variations the base voltage earlier in the cycle thus increasing the SCR firing angle A Positive going current balance control signal has the Opposite effect 4 43 SCR Firing Circuit and Regulator Behavior at Low Outputs Each firing circuit and its associated SCR has a mi
31. 032 See applicable Option at rear of Table 6 9 REF MFR DESIG DESCRIPTIONT MFR PART NO CODE HP PART NO A3T1 3 Transformer Bias 1 28480 5080 7155 1 T10 11 Transformer Power 2 28480 5080 7131 1 Front Panel Assembly Electrical Light Indicator LINE ON 1450 0419 Light Indicator Overcurrent Protect 1450 0708 Light Indicator Temperature 1450 0350 Voltmeter 700V 1120 1240 Ammeter 30A var ww 200k 3 10 Turn Coarse 1120 1175 Voltage Adjust 2100 2000 var ww 1k 5 Fine Voltage Adjust 2100 1847 var ww 300 5 Fine Current Adjust 2100 1848 var ww 1k 596 Coarse Current Adj 2100 1847 Switch Toggle DPST 1 2GK50 73XSV1 3101 0946 Rear Panel Assembly Electrical F4 6 fuse 0 3A 600V 2110 0398 15 F78 88 fuse 1 6A 500V 2110 0401 10 Output Capacitor Tray Electrical 28480 fxd elect 2500uF 350V 36D252F350DF68 56289 0180 1844 3 Main Frame Electrical 1 Fan 1 3160 0240 1 fxd paper 047uF 3000V 1 185P473930 0160 2480 1 Rect Si 500V 100A 3 1901 1048 3 Thyristor 500V 10W 3 1884 0092 3 Diode Si 1 2kV 35A 6 1901 0370 6 fuse 70A 600V 3 2110 0392 15 Choke 1 06483 80098 1 fxd ww 0 04 10 40W 3 0811 1950 1 fxd ww 1 3k 5 55W 9 0811 2076 2 Transformer Power 1 06483 80095 1 Transformer Power 1 5080 7154 1 Switch Thermal 1 3103 0012 1 MECHANICAL 1 Amplifier Board
32. 0Hz input possible only with Option 05 output current is linearly derated from 10095 at 40 C to 80 at 50 C Other specifications indicated in Table must be increased by 50 for a 50Hz input T3 SECTION INSTALLATION 21 INITIAL INSPECTION 2 2 Before shipment this instrument was inspected and found to be free of mechanical and electrical defects As soon as the instrument is unpacked inspect for any damage that may have occurred in transit Save all packing materials until the inspection is completed If damage is found file a claim with the carrier immediately Hewlett Packard Sales and Service office should be notified 2 3 Mechanical Check 2 4 This check should confirm that there are no broken knobs or connectors that the cabinet and panel surfaces are free of dents and scratches and that the meters are not scratched or cracked 2 5 Electrical Check 2 6 The instrument should be checked against its electri cal specifications Section V includes an in cabinet performance check to verify proper instrument operation 27 INSTALLATION DATA 2 8 The instrument is shipped ready for operation It is necessary only to connect the instrument to a source of pow er and it is ready for operation 29 Location 2 10 This instrument is fan cooled Sufficient space should be allotted so that a free flow of cooling air can reach the sides of the instrument when it is in operation It should be used in an area where the ambien
33. 10 Three Phase 57 to 63Hz 50A per phase 230Vac OUTPUT 0 600V 0 15A or 0 500V 0 20A or 0 400V 0 25 NOTES 1 and 2 LOAD REGULATION Constant Voltage Less than 0 05 plus 100mV for load current change equal to the current rating of the supply Constant Current Less than 0 1 plus 35mA for a load voltage change equal to the voltage rating of the supply LINE REGULATION Constant Voltage Less than 0 0596 plus 100mV for any change within the input rating Constant Current Less than 0 1 plus 3bmA for any change within the input rating RIPPLE AND NOISE Constant Voltage Less than 600mVrms 5V to 20MHz NOTE 2 TEMPERATURE RATINGS Operating 0 to 500C Storage 40 to 750C TEMPERATURE COEFFICIENT Constant Voltage Less than 0 03 plus 20mV change in output per degree Centigrade change in ambi ent following 30 minutes warm up Constant Current Less than 0 06 plus 60mA change in output per degree Centigrade change in ambi ent following 30 minutes warm up STABILITY Constant Voltage Less than 0 15 plus 80 total drift for 8 hours following 30 minutes warm up under constant ambient conditions Constant Current Less than 0 3 plus 250mA total drift for 8 hours following 30 minutes warm up under constant ambient conditions TRANSIENT RECOVERY TIME Less than 50ms 100ms is required for output voltage
34. 100 4 CEA 0 LB16J1 Type 110 F4 Type C42S Type C42S CA3026 LM301A 192 33392 192P2249R8 150D335X9050B2 192P33392 192P2249R8 150D335X905082 192P33392 192P2249R8 150D335X905082 HP PART NO 2100 1429 0811 0942 0686 7515 0764 0063 0811 2553 0698 3561 2100 0898 0757 0316 0837 0023 2100 0328 0698 3669 0698 3658 5080 7158 1820 0240 1820 0223 1902 3070 1902 0048 1902 0761 1902 0 84 1902 1221 1902 0761 1902 3 85 1902 0049 5060 7916 0160 0 63 0180 1836 0180 1980 0160 2453 0180 2 0160 0 41 63 0180 1836 0180 1980 0160 2453 0180 2141 0160 0163 0180 1836 0180 1980 0160 2453 0180 2141 1901 0050 1901 0033 1901 0460 1901 0033 1901 0460 1901 0050 1901 0033 1901 0460 RS DESCRIPTIONT MFR PART baie HP PART NO 2 15 Diode Si 250mW 200V 1801 0033 CR16 17 Stabistor 400mW 10V 1901 0460 CR21 22 Diode Si 200mA 75V 1901 0050 CR23 Diode Si 250mW 200V 1901 0033 CR24 Stabistor 400mW 10V 1901 0460 CR25 Diode Si 250mW 200V 1901 0033 CR26 27 Stabistor 400mW 10V 1901 0460 J1 Connector P C Board 44 pin 251 22 30 390 1251 0495 01 3 SS PNP Si 1853 0041 R1 fxd comp 510 5 5115 0686 5115 R2 fxd comp 2 4k 5 EB 2425 0686 2425 R3 fxd comp 240 5 EB 2415 0686 2415 R4 fxd comp 1 8k 5 EB 1825 0686 1825 R5 fxd comp 5 1k 5 EB 5125 0686 5125 R6 fxd comp 5 EB 3025 0686 3025 R7 fxd m
35. 31 032 1 9 Accessories 1 10 One accessory HP Part No 145454 is available with this supply It consists of four snap on casters and can be ordered with the power supply or separately from your local Hewlett Packard sales office 1 11 INSTRUMENT MANUAL IDENTIFICATION 1 12 This power supply is identified by a three part serial number tag The first part is the power supply model num ber The second part is the serial number prefix which con sists of a number letter combination that denotes the date of a significant design change The number designates the year and the letter A through M designates the month Jan through December respectively with 1 omitted The third part s the power supply serial number a different se quential number is assigned to each power supply 1 13 If the serial number on your instrument does not agree with those on the title page of the manual Change Sheets supplied with the manual or Manual Backdating Changes define the differences between your instrument and the instrument described by this manual 1 14 ORDERING ADDITIONAL MANUALS 1 15 One manual is shipped with each power supply Addi tional manuals may be purchased from your local Hewlett Packard field office see list at rear of this manual for address es Specify the model number serial number prefix and HP part number shown on the title page Table 1 1 Specifications INPUT 208 230 380 400 460
36. 5 2W fxd ww 7 5 5 2W fxd comp 16 5 var ww 500 5 Single Turn fxd met film 42 2 1 1 8W Thermistor disc 64 10 var ww 500 10 Single Turn fxd met oxide 390k 5 2W fxd met oxide 91k 5 2W Transformer Power Dual Differential Amplifier Operational Amplifier Diode zener 4 22V 5 400mW Diode zener 6 8V 400mW Diode zener 6 2V 5 400mW Diode zener 16 2V 5 400mW Diode zener 6 2V 5 250mW Diode zener 6 2V 5 400mW Diode zener 12 4V 5 400mW Diode zener 6 19V 5 400mW Firing Circuits fxd mylar O33uF 10 200Vdc fxd elect 65V fxd tantalum 1uF 35V fxd mylar 22uF 10 80Vdc fxd tantalum 3 3uF 50V fxd mylar 033uF 10 200Vdc fxd elect 5uF 65V fxd tantalum 1uF 35V fxd mylar 22uF 10 80Vdc fxd tantalum 3 3uF 50V fxd mylar 033uF 10 200Vdc fxd elect 5uF 65V fxd tantalum 1uF 35V fxd mylar 22uF 10 80Vdc fxd tantalum 3 34F 50V Diode Si 200mA 75V Diode Si 250mW 200V Stabistor 400mW 10V Diode Si 250mW 200V Stabistor 400mW 10V Diode Si 200mA 75V Diode Si 250mW 200V Stabistor 400mW 10V 032 See applicable Option at rear of Table DE a A ux Zang RR a am resistors ohms unless otherwise indicated These components are applicable to Options 001 and 002 Components will change for Options 003 031 and 6 8 MFR PART NO Type CT 100 4 247E4015 EB 7515 Type C42S Type BWH 1605 CT
37. 5 13 b Check reference voltages Table 5 2 Poor Load Regulation Constant Voltage Measurement technique Paragraph 5 11 b Reference circuit Table 5 2 c Ensure that supply is not current limiting Check constant cur rent comparator circuit Paragraph 5 47 Poor Load Regulation Constant Current a Reference circuit Table 5 2 Improper measurement technique c Ensure that supply is not voltage limiting Check constant volt age comparator circuit Paragraph 5 46 Oscillates Constant Voltage Constant Current Adjustment of R36 Paragraph 5 78 Open sensing lead S 5 7 SYMPTOM Instability Constant Voltage Constant Current Table 5 3 Miscellaneous Troubles Continued PROBABLE CAUSE Reference circuit Table 5 2 Noisy voltage or current controls R1 R2 or R3 R4 Stage 101 or A1U2 defective CR1 CR2 or CR8 leaky AT1CR1 CR2 CR13 CR14 C1 C10 VR2 noisy or drifting AFTER INITIAL SET UP 5 43 TURN ON SUPPLY AFTER TURN ON DELAY OBSERVE FRONT PANEL METERS FOR OF THE FOLLOW INDICATIONS OUTPUT VOLTAGE GOES HiGH FULL SCALE OR ABOVE ISOLATE TROUBLE TO FRONT PANEL METERS OUTPUT VOLTAGE REMAINS HIGH CHECK SCR S CRS AND CRE AND COMPANION DIODES CRI CR2 AND FOR SHORT IF TROUBLE IS iN PARA 5 49 TROUBLE IN AMPLIFIER PORTION OF LOOP 60 16 PARA
38. 5 has been changed to new type and its fuses F7 and F8 have been changed in rating The new part number for T5 is 5080 1874 F7 and F8 are now 1 500V time delay fuses type FNQ 1 HP Part No 2110 0558 Add to paragraph 2 12 the statement that four eyebolts are provided that can be attached to the top of the unit if a hoist must be used to lift it On page 6 11 change the quantity of eyebolts to four 4 CHANGE 7 a Under Output Capacitor Tray on page 6 11 of the Parts list add bus bar HP Part No 06483 00001 This bus bar connects the positive terminal of C1 with the negative term inal of C2 CHANGE 8 Under Main Frame Electrical on Page 6 10 of the parts list change the HP Part No of C17 to 0160 4427 ERRATA On page 6 8 of the parts list change the HP Part No of resistor A1R141 to 2100 1772 The resistor has not been changed just its part number has in paragraph 5 83 on page 5 13 the figures in the Resistor Value column of step are all incorrect The proper resistor value for programming full rated output current in all of the listed models 6464C through 6483C is 1000 ohms Add to paragraph 2 12 the statement that four eyebolts are provided that can be attached to the top of the unit if a hoist must be used to lift it On page 6 11 change the quan tity of eyebolts to four Add to paragraph 1 10 the state ment that the standard supply ordered with or without accessory
39. 6 fxd met film 1 69k 1 1 8W Type CEA 0 0698 4428 fxd comp 1k 5 1025 0686 1025 fxd met film 2k 1 1 8W Type CEA 0 0757 0283 fxd met film 8 25k 1 1 8W Type CEA 0 0757 0441 fxd met film 6 2k 1 1 8W Type CEA 0 0698 5087 fxd met film 23 7k 1 Type CEC 0 0698 3417 fxd comp 1 3k 5 EB 1325 0686 1325 fxd comp 51k 5 5135 0686 5135 fxd comp 9 1k 5 EB 9125 0686 9125 fxd comp 18k 5 EB 1835 0686 1835 var ww 15k 5 Single Turn Type CT 100 4 2100 0896 fxd comp 11k 5 1135 0686 1135 fxd comp 9 1k 5 EB 9125 0686 9125 fxd comp 390 5 ZW EB 3915 0686 3915 fxd comp 120 5 1215 0686 1215 fxd comp 2k 5 EB 2025 0686 2025 are Nc ee eee TNOTE resistors are in ohms unless otherwise indicated NOTE These components are applicable to Options 001 and 002 Components will change for Options 003 031 and 032 See applicable Option at rear of Table 6 6 REF DESIG DESCRIPTIONT A1R54 R55 R56 R57 R58 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R70 71 R75 R76 R77 R78 R79 R80 R83 R84 R85 R86 8 R908 918 R92 93 R94 95 R96 R98 R99 R100 R101 R102 R1108 1118 8112 113 R114 115 R116 R118 R119 R120 R121 R122 R125 126 R127 R128 R129 R130 fxd comp 100 5 fxd met film 6 2k 1 1 8W fxd comp 1k 5 ZW fxd comp 39k 5 fxd comp 10k 5 fx
40. 7 provides a quick discharge path for C23 when the supply is turned off 4 65 Overvoltage Protection Circuit 4 66 This circuit prevents the output voltage from exceed ing approximately 11096 of the maximum voltage rating Under non overvoltage conditions transistor Q10 is cutoff due to the 12 4V bias connected to its base If the voltage at the output bus becomes positive enough exceeds the 110 threshold Q10 conducts clamping the error amplifier input Resistor R82 mounted on standoffs is factory se lected to obtain the desired trip point 4 67 Phase Protection Circuit 4 68 This circuit protects the SCR s and power transformer in case one of the input phases should fail The three phase input is rectified by CR38 CR39 and 40 filtered by C30 and the resultant voltage on the base of O9 is normal ly negative enough to hold the transistor off However if one of the input phases fails or if all three phases drop be low 25 of the nominal voltage the voltage across C30 be comes positive enough to break down zener diode VR10 and drive O9 into conduction The conduction of O9 clamps the input to the error amplifier to a less positive voltage thus turning off the SCR s 4 69 Resistor R77 in the base circuit of Q9 is factory se lected to obtain the desired trip point 4 70 Early Overcurrent Protection 4 71 This circuit provides rapid protection for the load during initial short circuit conditions When activa
41. 8 gauge wire The safety ground wire should be the same gauge as the ac input wires to ensure that it does not open and create a safety hazard 2 18 The ac power source to this supply may be either delta or wye with isolated neutral The three phase input voltages must be balanced to within 8 6 of each other for the supply to operate However if the input line voltages are unbalanced by more than 3 the unit may not meet the published ripple and noise specification although it will meet all other specifications Moreover if the user s line im balance exceeds 3 it is advisable to check the input line currents and adjust the current balance circuit if necessary refer to Paragraph 5 95 2 19 Any SCR regulated supply because of its inherent characteristics cannot tolerate a great degree of distortion in the input line voltage The amount of distortion that can be tolerated is not precisely defined but the supply should never be driven from the output of an inverter or a saturable reactor type of regulator where the nominally sinusoidal waveshape is flattened considerably Another cause of distor tion is high line impedance The user should contact the fac tory if trouble is experienced this area 2 20 208 230Vac Conversion 2 21 To convert the unit from a 208 Vac Option 001 to a 230Vac Option 002 input or vice versa it is necessary on ly to restrap transformers 4 T5 and 1 T2 and No other changes are ne
42. Amplifier Board R90 91 110 111 fxd met oxide 39 5 2W 06483 60025 0811 2244 6 13 Resistors are in ohms unless otherwise indicated DESCRIPTIONT Control Board MFR A PART NO CODE HP PART NO 5060 7936 REF DESIG A3 L1 L3 Inductor 5080 7156 R1 R3 fxd met oxide 100 5 2W Type C428 0698 3620 T1 TS3 Transformer Bias 5080 7179 Main Frame Electrical Diode Si 1000V 100A CR1 CR3 1901 1047 CR4 CR6 SCR 1000V 55A 1884 0083 F1 F3 Fuse 60A 600V 2110 0391 T4 Transformer Power 06483 80096 T5 Transformer Fan 5080 7178 Rear Panel Electrical Fuse 0 6A 500V 2110 0402 Frame Mechanical Fuse Block 2110 0396 032 400Vac Input Same as Option 031 Above 6 14 SECTION CIRCUIT DIAGRAMS AND COMPONENT LOCATION DIAGRAMS This section contains the circuit diagrams necessary for the operation and maintenance of this power supply Included are a Component location photographs Figures 7 1 through 7 5 showing the physical location and reference designators of parts mounted on the printed circuit boards and chassis 7 1 b Firing circuit waveforms Figure 7 6 showing the waveforms found at various points in the firing circuit Schematic diagram Figure 7 7 illustrating the cir cuitry for the entire power supply Voltages are given adja cent to te
43. E Remove jumper strap A1R149 and connect wiper of external 10k amp 2 10 turn potentiometer R148 to input of firing cir cuits 18 Set external pot to 12 4V end positive input will damage the SCR s 2 Connect oscilloscope to A201 a Normal waveform a Proceed to Step 3 base 22 and common A7 Figure 7 6 Observe base waveform with b Abnormal waveform b Component in base circuit defective external pot at 12 4V end Check A2C1 A2CR7 A2R3 etc blocking oscillator off c No waveform Fuse F5 or F6 open Base compo nent open 283 R4 etc 3 Connect oscilloscope to A201 a Normal waveform a Proceed to Step 4 emitter TP25 and terminal Figure 7 6 7 Observe emitter waveform b Waveform abnormal b Component is emitter circuit defective with external pot at 12 4V or missing Check A2C3 A2R7 and 2 1 end blocking oscillator off 4 Leave scope connected to em a Normal waveform Proceed to Step 5 mitter of A201 and slowly Figure 7 6 turn external pot toward b 12 4V end When voltage at TP18 reaches about 4V first firing pulses should be generat ed This is characterized by a negative going notch on the emitter waveform Abnormal waveform Check A201 and associated compo nents A2T7 A2C2 A2R2 Check phase A SCR CR4 for open m 5 Turn external pot to negative end and check waveform at base of A202 phase B stage TP23 N
44. FACTURER ADDRESS Grant Pulley and Hardware West Nyack N Y Burroughs Corp Electronic Components Div Plainfield N J U S Radium Corp Morristown N J Yardeny Laboratories Inc New York N Y Arco Electronics Inc Great Neck N Y TRW Capacitor Div Ogallala Neb RCA Corp Electronic Components Harrison N Rummel Fibre Newark N Marco amp Oak Industries a Div of Oak Electro netics Corp Anaheim Calif Philco Corp Lansdale Div Lansdale Pa Stockwell Rubber Inc Philadelphia Pa Tower Olschan Corp Bridgeport Conn Cutler Hammer Inc Power Distribution and Control Div Lincoln Plant Lincoln Ill Litton Precision Products Inc USECO Div Litton Industries Van Nuys Calif Gulton Industries Inc Metuchen N J United Car Inc Chicago Ill Miller Dial and Nameplate El Monte Calif Chicago 11 Attleboro Mass Dale Electronics Inc Columbus Neb Elco Corp Wiliow Grove Pa Honeywell Inc Div Micro Switch Freeport Il Whitso Inc Schiller Pk Ill Sylvania Electric Prod Inc Semi conductor Prod Div Wobum Mass Essex Wire Corp Stemco Controls Div Mansfield Ohio Raytheon Co Components Div Ind Components Oper Quincy Mass Wagner Electric Corp Tung Sol Div Radio Materials Co Augat Inc Livingston N J Southco Inc Lester Leecraft Mfg Co Inc LLC Methode Mfg Co Rolling Meadows Ill Bendix Corp Microwave Devices Div Weckesser Co I
45. Frame Electrical and on schematic change C19 HP Part No to 0160 4122 C19 is connected across 1 On page 3 4 change title of Figure 3 4 to read Remote Voltage Programming Constant Voltage Unity Gain Figure 1 Crowbar schematic change C31 to 0047uF R40 to 150K and R44 to 150F the replaceable parts table make the following changes Under Amplifier Board 1 R131 Change R131 to HP Part No 2100 1774 CHANGE 1 the replaceable parts table and on the schematic as appli cable make the following changes Under Amplifier Board A1 A1R127 Change A1R127 to 27 4K2 1 8W Part No 0757 0452 Under Contro Board A3 Change A3T10 and A3T11 to HP Part No 5080 7187 Under Main Frame Electrical C18 Add C18 02uF 2KV HP Part No 0160 2569 On the schematic C18 is connected between the OUT buss and the chassis On Page 6 13 add the following changes for Option 005 50Hz operation 8 OPTION 005 50Hz Input 1 91 and A1R111 1 91 and A1R111 are deleted and jumpers installed A1R127 Change A1R127 to 40 2 1 4W HP Part No 0698 3210 CHANGE 2 In the replaceable parts table and on the schematic as appli cable make the following changes under Amplifier A1 A1C19 Change A1C19 to 47uF 25V HP Part No 0160 0174 1 20 Add A1CR20 stabistor HP Part No 1901 0460 On the schematic ATCR20 is connected between Error Amplifier 103 pin 2 cathode and the junction
46. Harbor City Calif Caddell amp Burns Mfg Co Inc Mineola N Y Palo Alto Div Palo Alto Calif Motorola Semiconductor Prod Inc Phoenix Arizona Westinghouse Electric Corp Semiconductor Dept Youngwood Pa Ultronix Inc Grand Junction Colo Wakefield Engr Inc Wakefield Mass General Elect Co Electronic Capacitor amp Battery Dept Irmo Bassik Div Stewart Warner Corp Bridgeport Conn 03888 04009 04072 04213 04404 Hewlett Packard Co 04713 05277 05347 05820 06001 5 6 06004 06486 IRC Div of TRW Inc Semiconductor Plant Lynn Mass 06540 Amatom Electronic Hardware Co Inc New Rochelle N Y Beede Electrical Instrument Co Penacook General Devices Co Inc Indianapolis Ind Semcor Div Components Inc Phoenix Arizona Robinson Nugent Ine New Albany Ind Torrington Mfg Co West Div Van Nuys Calif Transistor Electronics Corp Minneapolis Minn 06555 06666 06751 Use Code 28480 assigned to Hewlett Packard Co Code List of Manufacturers MANUFACTURER ADDRESS Westinghouse Electric Corp Electronic Tube Div Elmira Fairchild Camera and Instrument Corp Semiconductor Div Mountain View Calif Los Angeles Calif Sylvania Electric Prod Inc Sylvania Electronic Systems 07387 07397 Birtcher Corp The Western Div Mountain View Calif IRC Div of TRW Inc Burlington Plant Burlington lowa Continent
47. If a fault is detected in the warm up power supply while making the performance check or during normal operation proceed to the troubleshooting procedures 5 3 TEST EQUIPMENT REQUIRED Paragraph 5 35 After troubleshooting and repair Para graph 5 54 perform any necessary adjustments and calibra 5 4 Table 5 1 lists the test equipment required to perform tions Paragraph 5 68 Before returning the power supply the various procedures described in this section Table 5 1 Test Equipment Required REOUIRED TYPE CHARACTERISTICS RECOMMENDED MODEL HP 34204 8 Differential Sensitivity 1mV full scale min Voltmeter Input impedance 10MX2 min Measure dc voltages calibration procedures HP 140A with 1423A time base and 1400A vertical plug in 1402A plug in for spike measurement Sensitivity and bandwidth 100uV cm and 400kHz for all measure ments except noise spike bmV sen sitivity and 20MHz bandwidth for noise spike measurement Measure ripple display transient recovery wave form measure noise spikes Oscilloscope Variable Voltage Transformer General Radio W30HG 2 or Power Stat Type 1256D 64 18kVA open Delta 0 270Vac or 54 3kVA 0 560V 56 Vary ac input for line regulation measurement Measure ac voltages and HP 403B ripple Sensitivity 1mV full scale deflec tion min Accuracy 2 AC V
48. Left 5000 6290 Post Corner Frame 5020 8021 Bar Frame 5020 8022 Tray Assembly Heat Sink 06483 60007 Heat Sink Rectifier CR7 CR9 5000 9329 Heat Sink Rectifier CR10 5000 9334 Heat Sink Rectifier CR11 5000 9335 Heat Sink Rectifier 12 5000 9336 Bracket Heat Sink 000 9330 insulator Heat Sink 2 5020 8044 Support Heat Sink 5020 8045 Tray Assembly P C Board 5060 7923 Standoff P C Boards 32 x 2322 0380 0093 Standoff P C Boards 32 x 1 9758 A 1032 0 0380 0728 Rubber Grommet 7 8 dia 2187 0400 0063 Rubber Grommet dia 2175 0400 0077 Guide P C Boards A1 A2 A3 0403 0150 Tray 5000 6289 Heat Sink SCR CR1 CR6 5020 8017 Insulator Heat Sink 5020 8019 Insulator Heat Sink 5020 8020 MISCELLANEOUS MECHANICAL Spacer 8 32 x 0380 0136 Cable Clamp 1400 0332 DESCRIPTIONT MFR PART NO HP PART NO 3150 0217 2110 0393 5000 6252 5000 6292 5000 6293 5000 6294 5000 6296 5000 6297 5000 6298 5000 6300 5000 9301 5000 9302 5000 9319 5000 9320 5000 9321 5000 9322 5000 9325 5000 9331 5020 8046 Air Filter Front Panel Fuse Block F1 F3 Busbar Output 1 16 Cover Top Cover Side Bottom Front Panel Bracket Filter Bracket Fan B1 Bracket Fan B1 Cover Output Busbars Hinge Mounting Bracket Hinge Mounting Bracket Trim Strip Cover Barrier Strip A2TB1 A2TB2 Bracket Fan B1 Cover P C Board Protection Bracket Capacitor Tray Bottom
49. N Y Waldes Kohinoor Inc L I C Whitehead Metals Inc New York N Y Continental Wirt Electronics Corp Philadelphia Pa Zierick Mfg Co Mt Kisco N Y Mepco Div of Sessions Clock Co Morristown N J Bourns Inc Riverside Calif Howard Industries Div of Msi Ind Inc Racine Wisc Grayhill Inc La Grange International Rectifier Corp EL Segundo Calif Columbus Electronics Corp Yonkers N Y Goodyear Sundries amp Mechanical Co Inc New York N Y Airco Speer Electronic Components Du Bois Pa Sylvania Electric Products Inc Electronic Tube Div Receiving Tube Operations Emporium Pa Switchcraft Inc Chicago Ill Metals and Controls Inc Control Products Group Attleboro Mass Research Products Corp Madison Wis Rotron Inc Woodstock N Y Vector Electronic Co Glendale Calif Carr Pastener Co Cambridge Mass Victory Engineering Corp Springfield N J Bendix Corp Electric Power Div Eatontown N J Herman Smith Inc Brooklyn N Y Central Screw Chicago Gavitt Wire and Cable Div of Amerace Esna Corp Brookfield Mass CODE 83508 83594 83835 83877 84171 84411 86684 86838 87034 87216 87585 87929 88140 88245 90634 90763 91345 91418 91506 91637 91662 91929 92825 93332 93410 94144 94154 94222 95263 95354 95712 95987 96791 97464 97702 98291 98410 98978 99934 Code List of Manufacturers Continued MANU
50. OR 24 TP22 23 OR 24 01 02 OR Q3 OFF Q1 Q2 OR Q3 ON FIRING POINT TP25 26 OR 27 TP25 26 0R 27 01 Q2 OR Q3 OFF 01 Q2 OR Q3 ON TP22 23 OR 24 TP26 26 OR 27 CLOSED LOOP FULL LOAD CLOSED LOOP FULL LOAD Figure 7 6 Firing Circuit Waveforms 7 7
51. Rear Panel Insulator Busbar mE NIE EE MISCELLANEOUS Carton Packing Base Wood Skid Floater Top 1 1 1 001 208Vac Input E 9211 1188 9220 1407 9220 1408 See Pages 6 5 through 6 12 S OPTION 002 230Vac Input See Pages 6 5 through 6 12 003 460Vac Input Amplifier Board 06483 60024 fxd met oxide 390k 5 2W Type C42S 0698 3669 R90 91 110 111 fxd met oxide 43 5 2W Type C42S 0698 3614 R145 fxd met oxide 390k 5 2W Type C42S 0698 3669 R146 fxd met oxide 91k 5 2W Type C42S 0698 3658 Control Board 5060 7919 11 13 Inductor 5080 7156 R1 R3 fxd met oxide 100 5 2W Type C428 0698 3620 Main Frame Electrical CR1 CR3 Diode Si 1000V 100A 1901 1047 CR4 CR6 SCR 1000V 55 1884 0083 F1 F3 Fuse 60A 600V 2110 0391 T4 Transformer Power 06483 80097 T5 Transformer Power 5080 7154 Rear Panel Electrical Fuse 0 6A 500V 2110 0402 Resistors are in ohms unless otherwise indicated 6 12 MER DESIG DESCRIPTIONT g MFR PART NO CODE HP PART NO E m Mechanical E cm Btock 28480 2110 0396 OPTION 006 Overvoltage Crowbar Firing Circuits 06483 60023 1 C27 fxd elect 490uF 85V 1 0180 1888 C30 fxd ceramic 0 47uF 25V 1 0160 0174 C31 fxd myl
52. ad Circuit 4 23 This circuit detects the presence of an extended over current or an overtemperature condition and deenergizes contactor K2 if either of these conditions occur With K2 deenergized the 3 phase ac input path is interrupted shut ting down the supply Contactor K2 is also deenergized if the overload circuit receives a trip input from the over voltage crowbar optional circuit 4 24 The overload circuit continuously monitors the line current on phases B and C and deenergizes K2 if the line current exceeds approximately 40 of the nominal rms line rating of the unit for a period of about one second The overload circuit also illuminates the OVERCURRENT PRO lamp on the front panel under these conditions Dur ing normal operation of the supply the early overcurrent protection circuit and or the constant current feedback loop will compensate for overcurrent problems before the over load circuit ever becomes activated However should a fail ure occur within these overcurrent protection circuits the overtoad circuit would then become activated deenergizing K2 and shutting off the supply 4 25 A thermal switch mounted on the SCR heat sink pro vides overtemperature protection by opening if the heat sink temperature rises to 2000 208Vac or 230Vac input or 1709 5 F 380Vac 400Vac or 460Vac input Opening the thermal switch deenergizes contactor K2 and removes the short across the TEMPERATURE lamp
53. al Device Corp Hawthorne Calif Raytheon Co Components Div Semiconductor Operation Mountain View Calif Breeze Corporations Inc Union N J Reliance Mica Corp Brooklyn Sloan Company The Sun Valley Calif Vemaline Products Co Inc Wyckoff General Elect Co Minia ture Lamp Dept Cleveland Ohio Nylomatic Corp Norrisville Pa RCH Supply Co Vernon Calif Airco Speer Electronic Components Bradford Pa Hewlett Packard Co New Jersey Div Rockaway N J General Elect Semiconductor 07716 07910 07933 08484 08530 08717 08730 08806 08863 08919 09021 09182 09213 Prod Dept Buffalo N Y 09214 General Elect Co Semiconductor Prod Dept Auburn N Y 09353 09922 11115 C amp K Components Inc Burndy Corp Wagner Electric Corp Tung Sol Div CTS of Berne Inc Chicago Telephone of Cal Inc So Pasadena Calif Boone Plant Boone Newton Mass Norwalk Conn Bloomfield N J 11236 Berne Ind 11237 11502 IRC Div of TRW Inc N C 11711 General Instrument Corp Rectifier Div Philadelphia Handle Co Inc Camden U S Terminals Inc Cincinnati Ohio Hamlin Inc Lake Mills Wisconsin Clarostat Mfg Co Inc Dover Thermalloy Co Dallas Texas Hewlett Packard Co Loveland Div Loveland Colo Cornell Dubilier Electronics Div Federal Pacific Electric Co Newark N J General Instrument Cor
54. alue The three SCR s are then turned off momentarily until the line current falls below the 40 threshold and the early overcurrent protection circuit is de activated At this time the constant current comparator and remaining components of the feedback loop again assume control of the SCR s keeping the output current constant despite short circuit conditions 4 19 Although the constant current comparator attempts to keep the output current from rising when the output is first shorted it requires approximately 5 cycles of the input ac before a correction can be made This delay is a result of the overali loop response time and is mostly caused by equat izing networks within the error amplifier The early overcur rent circuit overcomes this delay by bypassing the error am plifier and injecting its turn off signal directly into the firing circuits With this arrangement correction can begin after only one cycle of the input ac 4 20 Phase Protection Circuit 4 21 Another protection circuit used in this supply is the phase protection circuit This circuit insures that no damage will occur internally should one or more of the input phases fail or if the ac voltage on all three input lines falls below 2596 of the input rating If such a failure does occur the phase protection circuit clamps the feedback control signal off at the input to the error amplifier When the input lines return to normal the operation reverses itself 4 22 Overlo
55. and adjust CUR RENT controls for desired output current b Open output terminals and adjust VOLTAGE trols for maximum output voltage allowable voltage limit as determined by load conditions If a load change causes the voltage limit to be exceeded the power supply will auto matically cross over to constant voltage output at the preset voltage limit and the output current will drop proportion ately In setting the voltage limit allowance must be made for high peak voltages which can cause unwanted crossover Refer to Paragraph 3 63 NOTE As indicated on the Specification Table 1 1 thesupply may not meet all specifications under light load conditions These constraints are due to minimum operating thresh olds inherent in the SCR s in the regulator However as shown on Table 1 1 the supply will operate satisfactorily if the supply delivers more than 30 of the rated output voltage Constant Voltage opera tion or rated output current Con stant Current operation Only 5 of rated output voltage or current is required provided that the supply is deliver ng more than 100 Watts to the load 3 11 Load Operation 3 12 When the supply is operated without a load down programming speed is considerably slower than in normal loaded operation The actual time required for the output voltage to decrease to a level set by the front panel control varies from approximately 6 seconds to about 200 seconds dependin
56. applicable Option at rear of Table 6 5 ENG DESCRIPTIONT MFR PART HP PART NO RS 1 58 Thyristor 600V 2A 1884 0044 CR60 61 Stabistor 400mW 10V 1901 0460 K1 Relay 4 PDT KHP 17D11 24 0490 0364 01 55 1854 0244 02 3 SS NPN Si 1854 0087 04 SS PNP Si 1853 0010 05 SS NPN Si 1854 0224 SS PNP Si 1853 0041 SS NPN Si 1854 0244 Unijunction Si SS 2N2646 1855 0010 fxd met film 23k 1 1 8W Type CEA 0 0698 3269 fxd met film 47 5k 1 1 8W Type CEA 0 0757 0457 fxd met film 20k 1 1 8W Type CEA 0 0757 0449 fxd ww 1k 5 30ppm 0C 242E1025 0813 0001 fxd ww 1 3k 5 3W 30ppm oC 242E1325 0811 1803 fxd met film 6k 1 1 8W Type CEA 0 0698 3476 fxd met film 6 2k 1 1 8W Type CEA 0 0698 5087 fxd comp 18k 5 W EB 1835 0686 1835 fxd comp 33k 5 EB 3335 0686 3335 fxd met film 20k 1 1 8W Type CEA 0 0757 0449 fxd met film 33k 1 1 8W Type CEA T 0 0698 5089 fxd comp 560 5 EB 5615 0686 5615 fxd met film 3k 1 1 8W Type CEA 0 0757 1093 fxd met film 160k 1 1 8W Type CEA 0 0698 5092 ilm 23 7k 1 AW 0 0698 3417 ilm 2k 1 1 8W Type CEA 0 0757 0283 fxd comp 18k 5 12W EB 1835 0686 1835 fxd met film 6 2k 1 1 8W 0 0698 5087 fxd met film 8 25k 1 1 8W Type CEA 0 0757 0441 fxd comp 1k 5 1025 0686 1025 fxd met film 8 25 1 1 8W Type CEA T 0 0757 0441 fxd met film 6k 1 1 8W Type CEA 0 0698 347
57. approximately 50usec Once the SCR is fired it remains in conduction even though the gate input is removed until the input ac swings positive 4 34 Inductors L1 L2 and L3 limit surge currents due to the conduction of their respective SCR s A capacitive net work connected across each SCR filters voltage transients caused by contactor K2 when it is energized or deenergized Also connected across each SCR is a diode CR1 CR3 which protects the SCR against reverse voltages and also serves as the return path for the current from one of the other phases 4 35 Firing Circuits The three phase firing circuits receive the output from the error amplifier and generate firing pulses that turn on the SCR s in their respective phases at the precise time necessary to fulfill the feedback loop re quirements As indicated on the schematic everything is done in triplicate For each phase there is a blocking oscilla tor which is synchronized so that each SCR conducts at identically the same phase angle in its respective phase 4 36 The input to the firing circuits is the feedback voltage from error amplifier 103 This voltage varies between 1V dc to 3Vde with respect to common NC at terminal A7 as a function of the output conditions The feedback voltage is applied to an integrating network R7 C3 R17 C13 and R27 C23 in the emitter circuit of each blocking oscillator The emitter capacitors produce a steadily rising ramp volt age whose or
58. ar 0047uF 200V 1 192P47292 0160 0157 C32 fxd ceramic 100pF 1kV 1 0160 2061 CR30 33 Diode Si 0 75A 200prv 4 1901 0327 CR34 35 Diode Si 180V 200prv 2 1901 0033 CR36 SCR 600V 2A 1 1884 0044 Q7 SS PNP Si 1 1853 0041 SS PNP Si 1 1853 0099 ag Power NPN Si 1854 0224 SS NPN Si 1854 0244 fxd 75 5 EB 7505 0686 7505 fxd comp 130 5 AW 1315 0686 1315 fxd comp 1 5k 5 1525 0686 1525 fxd comp 2k 5 AW EB 2025 0686 2025 fxd comp 470 5 4715 0686 4715 fxd comp 2k 5 EB 2025 0686 2025 fxd met oxide 150k 5 2W Type C42S 0764 0049 fxd met oxide 43 5 2W Type C42S 0698 3614 fxd comp 1k 5 EB 1025 0686 1025 fxd met oxide 150k 5 2W Type C428 0764 0049 fxd comp 2k 5 2025 0686 2025 fxd comp 1 5k 5 1525 0686 1525 fxd comp 300 5 W EB 3015 0686 3015 fxd comp 200 5 EB 2015 0686 2015 fxd 750 5 EB 7515 0686 7515 fxd comp 300 5 3015 0686 3015 Diode zener 6 19 5 400mW 1902 0049 Main Frame Electrical SCR 1000V 55A 1884 0083 Light Indicator 1450 0708 var ww 40k 10 Turn Crowbar Adj 2100 1868 fxd ww 10 55W 0811 1960 Transformer Crowbar 5080 7177 Front Panel Assembly Mechanical Front Panel 5000 9324 28480 0590 0789 3 28480 5020 8037 28480 425 16299 OPTION 023 Rack Mounting Kit Nut Retainer Ear Rack Mounting SOPTION 031 380Vac Input
59. ar of the unit The output terminals are heavy busbars also mounted at the rear of the unit Terminal strips at the rear of the unit allow ease in ex panding the operational capabilities of the instrument A brief description of these capabilities is given below a Remote Programming The power supply output voltage or current may be programmed controlled from a remote location by means of an external voltage source or resistance b Remote Sensing The degradation in regulation which occurs at the load due to voltage drop in the load leads can be reduced by using the power supply in the re mote sensing mode of operation c Auto Series Operation Two power supplies may be used in series when a higher output voltage is required in the constant voltage mode of operation or when greater voltage compliance is required in the constant current mode of operation Auto Series operation permits one knob control of the total output voltage from a master supply d Auto Parallel Operation The power supply may be operated in parallel with another unit when greater output 14 Figure 1 1 Typical 10kW Power Supply SCR 10 Series current capability is required Auto Parallel operation per mits one knob control of the total output current from a master supply e Battery Charging or Discharging The supply can be used in automatic battery charging or discharging applica tions The automatic crossover between constant voltage an
60. are operating correctly If reading is not 11 1 1Vdc proceed to next step g 9 Measure voltage at input of A1U3 between TP19 and terminal A7 Next measure voltage between TP17 and terminal A7 other input to A1U3 h Both measurements TP 17 and TP19 should be 6 t 1Vde If these input readings are correct but either output reading Step or Step F was incorrect check A1U3 5 49 Firing Circuits Open Loop Troubleshooting Also A1Q2 and A1Q3 can shunt down the output of the error amplifier if either is shorted 5 50 All of the firing circuitry that controls the SCR s is i If either input measurement is not 6 1Vdc located on the firing board A2 The test is performed open check for a shorted transistor A104 09 or Q10 in the loop jumper strap R149 removed with 10 10 turn protection circuits Also check zener diode A1VR3 Final potentiometer connected to TP18 as shown on the schema ly check voltage at output of backup overcurrent protec tic and described on NOTE 14 The check is made by ob tion circuit TP11 and terminal A7 It should be 12 2V serving circuit waveforms shown at the rear of the manual dc with any front panel setting of the CURRENT control As indicated in Table 5 4 all three firing circuits are check If reading is not within tolerances check A1U2 and associ ed starting with phase A ated components Table 5 4 Firing Circuit Troubleshooting STEP ACTION response PROBABLE CAUS
61. bars and rotate Voltage controls fully clockwise Turn on supply On page 3 2 paragraph 3 8 add the following sentence to the beginning of step b Turn off supply and allow the output voltage to bleed down Add this same sentence to paragraph 3 10 step a paragraph 3 55 steps b and d and paragraph 5 32 step e In the Replaceable parts list and on the schematic diagram change variable resistors AlR102 and A1R122 to 20K 1 2W HP 2100 0058 CHANGE 14 One of two types of cooling fans is installed in this supply the HP Part No 3160 0240 or 3160 0285 The capacitor C19 to be used with the fan depends on which fan is installed With fan 3160 0240 use 8uF 370Vrms capacitor HP Part No 0160 4122 With fan 3160 0285 use 5uF 370Vrms capacitor HP Part No 0160 0585 CHANGE 15 In the replaceable parts list Page 6 10 under Main Frame Electrical change Fan to Fan Assembly HP P N 3160 0498 and on page 6 12 under Micellaneous Mechanical change Bracket Fan HP P N 5000 9321 to HP P N 5020 2684 4 7 86 SECTION V MAINTENANCE 5 1 INTRODUCTION to normal operation repeat the performance check to en sure that the fault has been properly corrected and that no 5 2 Upon receipt of the power supply the performance other faults exist Before performing any maintenance check Paragraph 5 5 should be made This check is suit checks turn on the power supply and allow a half hour able for incoming inspection
62. ble ringing and capacitors must be inserted to block the dc current path 3 The length of the test leads outside the coax is critical and must be kept as short as possible the blocking capacitor and the impedance matching resistor should be connected directly from the inner conductor of the cable to the power supply terminals 4 Notice that the shields of the power supply end of the two coax cables are not connected to the power supply 500 TERMINATION T CONNECTOR M POWER SUPPLY a OSCILLOSCOPE 502 a ee T CONNECTOR Im 50 TERMINATION Figure 5 3 Noise Spike Measurement Test Setup 5 4 ground since such a connection would give rise to ground current path through the coax shield resulting in an errone ous measurement 5 Since the impedance matching resistors constitute a 2 to 1 attenuator the noise spikes observed on the oscillo scope should be less than half the peak to peak values given in Paragraph 5 19 Step d 5 22 The circuit of Figure 5 3 can also be used for the nor mal measurement of low frequency ripple simply remove the four terminating resistors and the blocking capacitors and substitute a higher gain vertical plug in in place of the wide band plug in required for spike measurements Notice that with these changes Figure 5 3 becomes a two cable version of Figure 5 2 5 23 Transient Recovery Time Definition The time required for output volt age recovery to wit
63. box until output is 11096 of rating and install proper resistor in R83 position 5 13 5 81 Constant Current Programming Accuracy 5 82 Zero Output Current To calibrate the zero current programming accuracy proceed as follows a Connect test setup shown on Figure 5 7 b Short out current controls by connecting jumper between terminals A4 and A6 c Rotate VOLTAGE controls fully clockwise and turn on supply d Reading on differential voltmeter should be 0 10mV e If it is not shunt resistor ATR28 with a decade resistance box f Adjust decade resistance until differential voltmeter reads zero then replace R28 with resistance value equal to that of decade resistance 5 83 CC Programming Accuracy To calibrate the constant current programming current proceed as follows a Connect power supply as shown in Figure 5 7 b Remove strap between Ab and A6 Connect a 0 1 1 8 Watt resistor between A4 and 6 Resistor value is as follows Model Resistor Value Ohms Rated Current Amps 6464C 2002 1000 6466C 2000 600 6469C 2000 300 6472C 2250 150 6475C 2002 100 6477C 2000 50 6479 2102 35 6483C 2502 25 d Turn on supply and observe voltmeter reading It should be voltage corresponding to rated output current 1 50 0 5 with a 5OmV shunt e If it does not replace A1R25 with decade resistance box f Adjust decade resistance to obtain voltage corres ponding to rated output current 196 on
64. cessary because the components used for Options 001 and 002 are identical The schematic diagram Figure 7 7 shows the transformers noted above 2 2 strapped for 230Vac operation Hence to convert the unit from a 208Vac input to a 230Vac input remove the 208V ac jumpers and connect the transformers as shown on the schematic To convert the unit from a 230Vac input to a 208Vac input simply use the 208V terminals as follows a With the unit off remove jumper between T5 3 and T5 6 Connect new jumper between T5 2 and T5 5 Disconnect wire from fuse F8 to T5 6 and connect it be tween F8 and T5 5 b For transformer T4 remove three straps between 1 230 B1 230 and C1 230 and connect a strap between A1 208 B1 208 and C1 208 On transformers A3T1 2 and A3T3 discon nect three jumpers between T1 0V and T2 230 T2 0V and T3 230 and T3 0V and T1 230 Connect three jump ers as follows 1 to T2 208 T2 0V to T3 208 and T3 0V to T1 208 2 22 380 400Vac Conversion 2 23 To convert the unit from a 380Vac Option 031 to a 400Vac Option 032 input or vice versa it is necessary on ly to restrap transformers T4 T5 and A3T1 T2 and T3 No other changes are necessary because the components used for Options 031 and 032 are identical 2 24 Transformer Connections for 380Vac Input Fora 380Vac input the OV tap on the primary transformer is connected to fuse F7 and the 380V tap is connected to fuse F8 The 400V
65. ch pro vide an unregulated 24Vdc The regulating circuit consists of series regulator Q5 driver and differential amplifier stage Q7 and O8 The differential amplifier compares the voltage at the junction of a voltage divider equal resistors R64 and R69 connected across the output 24 8V with the voltage at the supply s common point Any differ ence in voltage is detected and fed to series regulator Q5 in the correct phase and amplitude to maintain the output con stant The 6 3 and 8 2 voltages are developed across zener diodes and VR5 Output capacitors C27 and C28 sta bilize the regulator feedback loop MANUAL CHANGES Model 6483C DC Power Supply Manual HP Part No 06483 90003 Make all corrections according to errata below then check the following table for your power supply serial number and enter any listed change s in the manual CHANGES 0103 0109 1 14 1125 0110 0113 1 2 14 1125 0114 0125 1 2 3 14 1125 0126 0154 1 2 3 4 14 1545 0155 0162 1 thru 5 14 1545 0163 1 thru 6 14 1545 0164 0168 1 thru 7 14 1712 0169 0172 1 thru 8 14 1739 0173 0181 1 thru 9 14 1921 0182 0198 1 thru 10 14 1921 0199 0257 1 thru 11 14 2220A 0258 0281 1 thru 12 14 2329 6282 0323 1 thru 1 2614A 0324 up 1 thru 13 15 ERRATA In parts list under Mechanical change the HP Part No of the cable clamp to 0100 0437 In parts list under Main
66. d ww 2 7 5 2W fxd comp 2 4k 5 AW fxd comp 1 5k 5 fxd comp 1 8k 5 fxd met film 12k 1 1 8W fxd met film 8 25k 1 1 8W fxd ww 634 1 4W t20ppm oC fxd comp 10 5 fxd 470 5 fxd met film 12k 1 1 8W fxd met film 6 2k 1 1 8W fxd comp 1 3k 5 fxd met oxide 5 1k 5 2W fxd comp 2 7k 5 W fxd comp 180 5 fxd comp 620 5 AW fxd comp 10k 5 ZW fxd comp 30k 5 ZW fxd comp 15k 5 fxd comp 43k 5 fxd met oxide 390k 5 2W fxd met oxide 22 5 2W fxd met film 9 09k 1 1 8W fxd met film 7 5k 1 1 8W fxd comp 1k 5 fxd 330 5 ZW fxd comp 75k 5 fxd met film 15k 1 1 8W fxd comp 1 Meg 5 W var ww 15k 5 Single Turn fxd met oxide 22 5 2W fxd met film 9 09k 1 1 8W fxd met film 7 5k 1 1 8W fxd comp 1k 5 fxd comp 330 5 fxd comp 75k 5 fxd met film 15k 1 1 8W fxd comp 1 Meg 5 var ww 15k 5 Single Turn fxd comp 2k 5 fxd met film 47 5k 1 1 8W fxd comp 100k 5 fxd comp 1k 5 fxd met film 4 32k 1 1 8W t NOTE resistors are in ohms unless otherwise indicated NOTE These components are applicable to Options 001 and 002 Components will change for Options 003 031 and 032 See applicable option at rear of Table 6 7 MFR PART NO EB 1015 Type CEA 0 EB 1025 EB 3935 EB 1035 Type BWH EB 2425
67. d constant current permits the operation to be unattend ed 15 SPECIFICATIONS 1 6 Detailed specifications for the power supply are given in Table 1 1 on Page 1 3 17 OPTIONS 1 8 Options customer requested factory modifications of a standard instrument The following options are availa ble for the instrument covered by this manual Where neces sary detailed coverage of the options is included throughout the manual Notice that the customer must specify one of the five input power options available for this supply when ordering a unit These options 001 002 003 031 and 032 together with the other available options are described below Option No Description 001 208Vac 10 3 phase input 57 63 002 003 005 230Vac 10 3 phase input 57 63Hz 460Vac 10 3 phase input 57 63Hz 50Hz ac input Standard instrument is wired for nominal 60Hz ac input Option 005 includes re alignment and in some cases internal rewiring Internal overvoltage protection crowbar Not applicable to 6464C Protects delicate loads against power supply failure or operator error Monitors the output voltage and places a virtual short circuit conducting SCR across load with in 10 after preset trip voltage is exceeded For complete specifications refer to Appendix A Rack kit for mounting one supply in standard 19 rack 380Vac 10 3 phase input 57 63Hz 400Vac 10 3 phase input 57 63 2 006 023 0
68. dc fxd ceramic 01uF 500Vde fxd ceramic 470 25Vdc fxd tantalum 68uF 15V fxd tantalum 4 7uF 35V fxd elect 1450uF 45V Diode Si 250mW 200V Rectifier Si 800V Diode Si 250mW 200V Stabistor 400mW 10V Diode Si 250mW 200V Stabistor 400mW 10V Diode Si 250mW 200V Rectifier Si 200V 1A Diode Si 250mW 200V Stabistor 400mW 10V Diode 1 250mW 200V Rectifier Si 200V 1A TNOTE resistors in ohms unless otherwise indicated 192P10292 118 1059253 150D226X0035R2 150D226X0035R2 150D475X9035B2 841 000 250 2032 150D475X9035B2 1500105 9035 2 150D475X9035B2 150D105X9035A2 50D686X001582 500475 9035 2 50D686X001582 50D226X0035R2 30D105G050BA2 50D686X001582 RDM15E300J3C 192P 10492 50D686X0015B2 RDM15E300J3C 92P10492 D686X001582 D475X9035B2 06483 60022 0160 0153 0160 2569 0160 2465 0180 0160 0160 2477 0180 0160 0160 2569 0180 0100 0150 0024 0150 0081 0180 0100 0180 0291 0180 0100 0150 0081 0180 0291 0180 1835 0180 1884 0180 0100 0180 1835 0180 0160 0180 0108 0150 0121 0180 1835 0160 2199 0160 0168 0150 0081 0180 1835 0160 2199 0160 0168 0150 0081 0160 0174 0180 1835 0180 0100 0180 1893 1901 0033 1901 0330 1901 0033 1901 0460 1901 0033 1901 0460 1901 0033 1901 0327 1901 0033 1901 0460 1901 0033 1901 0327 8 NOTE These components are applicable to Options 001 and 002 Components will change for Options 003 031 and 032 See
69. e current controls R3 and R4 and a differ ential amplifier stage U2 and associated components As in the constant voltage comparator an integrated circuit is used for the differential amplifier to minimize differential voltages due to mismatched transistors and thermal differ entials 4 55 The constant current comparator circuit continuously compares the voltage drop across the CURRENT controls with the voltage drop across the current sampling resistors A4R123A AAR123B If a difference exists the differential amplifier produces an error signal which is proportional to this difference The remaining components in the feedback loop amplifiers firing circuit and SCR s function to main tain the drop across the current sampling resistors and hence the output current at a constant value 4 56 One input of the differential amplifier pin 1 is con nected to the supply s common point which is tied to the outbound side of the sampling resistors The other input of the differential amplifier pin 10 is connected to a sum ming point terminal A6 at the junction of the program ming resistors and the current pullout resistors R25 and R26 Changes in the output current due to load changes or changes in the voltage at the summing point due to manipu lation of the CURRENT controls produce a difference volt age between the two inputs of the differential amplifier This difference voltage is amplified and appears at the out put of the di
70. e per phase which operate in conjunction with the firing circuits error amplifier and Constant Voltage 441 Constant Current comparators as a feedback loop The feed back loop determines the firing time of the SCR s so that a regulated ac input voltage is applied to the primary of the power transformer The adjusted ac is then stepped down by the power transformer and receives full wave rectification and filtering before appearing at the output bus bars as a constant de output voltage or current 4 3 Feedback Loop 4 4 During normal operation the feedback signals controlling the SCR firings originate within the constant voltage or constant current comparator The SCR s are also controlled by the current balance circuit and in certain in stances by various protection circuits as will be explained subsequently During constant voltage operation the con stant voltage comparator continuously compares the output voltage of the supply with the drop across the VOLTAGE controls If these voltages are not equal the comparator pro duces an amplified error signal which is further amplified by the error amplifier and fed back to the firing circuits On the basis of the amplitude and polarity of the feedback signal the firing circuits then issue a phase adjusted firing pulse to each SCR so that the original difference is counteracted In this manner the constant voltage comparator helps to main tain a constant output voltage and also
71. e programming resistors VOLT AGE controls is heid constant by the action of constant current source Q1 A constant current flowing through the programming resistors assures linear constant voltage pro gramming 4 51 Comparator Protection Circuit used only on Models 6472C 6475C 6477C 6479C and 6483C 4 52 As indicated in the above paragraph heading this cir cuit is only used in the higher voltage Models of the SCR 10 Series of power supplies The circuit consists of a small three phase power supply which is used to forward bias diode A1CR3 The power supply consists of wye connected trans formers 1 A3T2 and A3T3 and a half wave rectifier 1 5 CR6 CR7 and filter A1C4 During normal oper ation this supply forward biases protection diode CR3 which is connected in series with the summing input to 101 pin 10 Under these conditions the diode acts as a near short circuit and has no effect on the operation of the constant voltage comparator However under no load con ditions or with a highly capacitive load if the supply is rapidly down programmed diode CR3 becomes reverse biased due to a positive going transient at its cathode With diode reverse biased the input path to comparator 101 is opened preventing damage to the device 4 53 Constant Current Comparator 4 54 This circuit is similar in appearance and operation to the constant voltage comparator circuit It consists of the coarse and fin
72. el Value Ohms Output Voltage 6464C 1600 8 6466C 3600 18 6469C 7200 36 6472C 12 8k 64 6475C 22k 110 6477C 44k 220 6479C 60k 300 6483C 120k 600 d Connect decade resistance box in place of ATR9 and turn on supply e Adjust decade resistance to obtain rated output voltage 1 f Adjustments for R9 and R11 may interact Recheck for 0 10mVdc output Paragraph 5 75 and repeat R11 and R9 adjustments if necessary g Turn off supply and replace decade box with appro priate value resistance in R9 position h Remove precision resistor and reinstall jumper be tween 2 and 5 77 Voltmeter Calibration 5 78 To calibrate the voltmeter proceed as follows a Connect differential voltmeter across supply ob serving correct polarity b Turn on supply and adjust VOLTAGE controls un til differential voltmeter reads exactly the maximum rated output voltage c Adjust A1R144 until front panel voltmeter also in dicates exactly the maximum rated output voltage 5 79 Overvoltage Protection Limit 5 80 The overvoltage limit sets the point at which the inter nal protection circuit 1010 is activated adjustment is as follows a Connect differential voltmeter across 5 and S ter minals b Turn on supply and set VOLTAGE controls fully cw c Voltmeter should read 110 of supply s rated out put voltage d does not turn off supply and connect decade resistance box in place of A1R83 e Adjust decade
73. essential to observe the output ripple to ascertain that all three SCR s are firing and that their conduction angles are approximate ly equal Proceed as follows to make this check Connect ac coupled oscilloscope between S and S terminals b Set VOLTAGE and CURRENT controls to mid range Turn on supply with no load connected d Observe output ripple 180Hz with no load and en sure that all three phases are firing no spaces between pulses and that the peak amplitudes between adjacent pulses are roughly equal within 25 to each other e If the ripple is unsatisfactory adjust the phase B and C balance potentiometers ATR102 and A1R122 until the conditions of Step d are satisfied 5 74 Constant Voltage Programming Accuracy 5 75 Zero Output Voltage To calibrate the zero voltage programming accuracy proceed as follows a Connect differential voltmeter between 4S and S terminals b Short out VOLTAGE controls by connecting jump er between A2 and S terminals c Connect decade resistance box in place of ATR11 d Turn on supply and adjust decade box to obtain 0 10mVdc output on voltmeter Turn off supply and replace decade box with appro priate value resistor in ATR11 position 5 76 Voltage Programming Accuracy a Remove short between A2 and S b Disconnect jumper between A2 and c Connect precision 0 196 wire wound resistance be tween A2 and S terminals Value shown below Mod
74. et film 9 09k 1 1 8W Type CEA T 0 0757 0288 fxd comp 510 5 EB 5115 0686 5115 fxd comp 2 4k 5 4W EB 2425 0686 2425 fxd comp 240 5 EB 2415 0686 2415 fxd comp 1 8k 5 1825 0686 1825 fxd comp 5 1k 5 5125 0686 5125 fxd comp 5 3025 0686 3025 fxd met film 9 09k 1 1 8W Type CEA 0 0757 0288 fxd 510 5 EB 5115 0686 5115 fxd comp 2 4k 5 EB 2425 0686 2425 fxd comp 240 5 2415 0686 2415 fxd comp 1 8k 5 1825 0686 1825 fxd 5 1k 5 EB 5125 0686 5125 fxd comp 5 3025 0686 3025 fxd met film 9 09k 1 1 8W Type CEA 0 0757 0288 fxd comp 47k 5 4735 0686 4735 fxd 100 5 1015 0686 1015 fxd comp 1k 5 EB 1025 0686 1025 Transformer Power 5080 7 157 CQ 00 Q Terminal Block 0360 1674 Control Board fxd ceramic 02uF 20 2000Vdc fxd ceramic 0 20 400Vdc 5060 7918 0160 2569 0150 0052 251 22 30 390 1251 0495 0490 0967 5080 7153 Type C428 0764 0013 EB 3035 0686 3035 3365 0686 0335 0837 0073 Connector P C Board 44 pin Cont ctor Inductor Line fxd met oxide 56 596 2W fxd comp 30k 5 fxd comp 3 3 5 AW Varistor 300V a 43060 05 O t NOTE resistors are in ohms unless otherwise indicated 8 NOTE These components are applicable to Options 001 and 002 Components will change for Options 003 031 and
75. etween S and S terminals b Connect full load resistance see Figure 5 1 across output bus bars Turn supply and adjust output voltage to about 20 of rating Observe output ripple 360Hz with load on scope d Peak amplitudes of adjacent ripple peaks should be equal to each other If they are not adjust A1R102 and A1R122 Increase output voltage in 10 steps adjusting R102 and R122 as necessary Final adjustment is made at maximum rated output 5 95 Balance Adjustment Line to Line Imbalance 3 to 8 For this adjustment the input line current is monitored rather than the output ripple This adjustment ensures that the current balance circuit within the supply is operating in the center region of its operating curve thus providing pro tection for the ac input components in the supply At the completion of the adjustment the input line currents will be balanced to within 3 to 5 Output ripple will probably be imbalanced to some extent due to the line to line voltage imbalance of 3 to 8 This adjustment is as follows a Attach ac clip on ammeter to any one of the 3 phase input wires b Connect full load resistance across output see Fig ure 5 1 Turn supply and adjust output to about 10 of rating Observe ac reading on ammeter d Attach clip on ammeter to one of the other two phases and compare reading with that of Step c If the two currents are unequal adjust A1R102 and A1R122 Set powe
76. f each of the positive and negative input currents become equal no error signal zero volts is generated 04 05 4 77 Potentiometers R101 and R121 provide a means of offsetting minor differences in the phase B and phase C current balance loop 478 Overload Circuit 4 79 The overload circuit detects the presence of an over temperature or extended overcurrent condition and deener g zes power contactor K2 if either of these conditions oc cur The circuit also provides a visual indication of both con ditions 4 80 Overcurrent Circuit Diodes CR50 through CR53 and capacitor C52 rectify and filter the phase B and C line voltage to provide a dc voltage which is equivalent to the line current During normal conditions no overload the rectified voltage is not sufficiently positive to turn on uni junction transistor Q11 With O11 off relay K1 is energized once power is applied to bridge rectifier CR54 CR57 through the LINE switch Closed contacts 8 and 12 of K1 then allow K2 to energize permitting application of the main three phase power to the unit 4 81 If the rms amplitude of the line current rises above 40 of the input line rating Q11 turns on providing a posi tive pulse to transformer T6 This pulse fires an SCR CR58 connected across relay K1 With K1 deenergized the ac path to contactor K2 is broken deenergizing this relay and removing the power Notice that 2 phase power is still applied to the overload circui
77. fferential amplifier pin 12 as an error voltage which ultimately varies the conduction of the SCR s 7457 Error Amplifier 4 58 Operational amplifier stage U3 provides most of the feedback loop gain During normal operation U3 receives the feedback voltage at its non inverting input from either the constant voltage or constant current comparator via OR gate diode CR23 or CR24 Diode CR23 is forward biased and CR24 reverse biased during constant voltage operation The reverse is true during constant current operation 4 59 Under overcurrent conditions U3 can also be driven by the overcurrent protection circuit via OR gate diode CR25 As previously mentioned protection circuit inputs are applied directly to pin 3 of U3 4 60 Feedback networks C15 R50 and C20 R46 shape the high frequency rolloff in the loop gain response to sta bilize the feedback loop 4 61 Overcurrent Protection Circuit 4 62 Stage U2 monitors the output current drop across the sampling resistors and conducts if the output current exceeds about 115 of the output current rating Resistor A1R38 is factory selected to set the 115 threshold point 4 63 Turn On Control 4 64 This circuit minimizes turn on overshoot by keeping the SCR s off for approximately 20 seconds after the unit is turned on At turn on O4 conducts providing a less posi tive voltage to the error amplifier This voltage keeps the SCR s off until C23 charges up turning off O4 Diode CR2
78. form on each input wire is of a rectangular shape and consists of positive and negative excursions The negative current flows through the SCR associated with the input line while the positive current 4 7 flows through a companion diode CR1 CR2 or CR3 and is in fact the return current from another phase The return current for the reference phase A flows through diode CR2 or CR3 and therefore appears on the phase B or C line as a positive going pulse The return current for phase B appears on the input lines of phase A or C and the return current for phase C appears on the input line of phase A or phase B 4 76 It is the function of each current balancing circuit to ma ntain the amplitudes of these positive and negative in put currents equal The positive pulses are rectified by CR46 CR48 filtered by C34 C44 and the resultant posi tive dc current is applied to the 2 of U4 U5 via sum ming resistor R95 R115 The negative excursions are recti fied by CR45 CR47 filtered by C35 C45 and the negative dc current is summed with the positive current by summing network R94 R95 R114 R115 If the amplitude of the positive and negative currents are unequal an error signal is developed at the output of U4 UB and fed to the firing circuits This error signal affects the bias on the base of 02 03 and ultimately advances or delays the firing of the SCR s according to the polarity of the original error signal Once the amplitudes o
79. g on the model number and the incremental change 3 13 Output Ranges Models 6466 and 6483C Only 3 14 Model 6466C can be operated in one of two output ranges while Model 6483C has three output ranges refer to Specification Table 1 1 for these units No range switch ing is required but the current and voltage requirements of the load should be predetermined to ensure that the ratings for a particular range will not be exceeded If a rating is ex ceeded one of the supply s internal protection circuits will be activated For example if the supply is operating in the high voltage low current range and the output current ex ceeds the rating for that range the overcurrent circuit will become activated and shut off the supply 3 15 Connecting Load 3 16 Each load should be connected to the power supply output terminals using separate pairs of connecting wires This will minimize mutual coupling effects between loads and will retain full advantage of the low output impedance of the power supply Each pair of connecting wires should be as short as possible and twisted or shielded to reduce noise pickup If a shielded pair is used connect one end of the shield to ground at the power supply and leave the other end unconnected 3 17 f load considerations require that the output power distribution terminals be remotely located from the power supply then the power supply output terminals should be connected to the remote distributio
80. generates the error signals necessary to set the output voltage at the level estab lished by the VOLTAGE controls 4 5 During constant current operation the constant cur rent comparator detects any difference between the voltage drop developed by the load current flowing through the cur rent sampling resistor and the voltage across the CURRENT controls If the two inputs to the comparator momentar ily unequal an error signal is generated which after ampli fication alters the firing angle of the SCR s by the amount necessary to reduce the error voltage at the comparator in put to zero Hence the IR drop across the current sampling resistor and therefore the output current is maintained at a constant value 4 6 Since the constant voltage comparator tends to achieve zero output impedance and alters the output current when ever the load resistance changes while the constant current comparator causes the output impedance to be infinite and changes the output vo tage in response to any load resistance change it is obvious that the two comparison amplifiers can not operate simultaneously For any given value of load re sistance the power supply must act either as a constant volt age source or as a constant current source it cannot be both 4 7 Figure 4 2 shows the output characteristic of a con stant voltage constant current power supply With no load attached lt gt lout 0 and EuT Es the front panel vol
81. hange in the static value of dc output current resulting from a change in ac input voltage over the specified range from low line to high line or from high line to low tine 5 34 To check the line regulation proceed as follows Utilize test setup shown in Figure 5 7 b Connect variable auto transformer between input power source and power supply power input c Adjust auto transformer for low line input 10 of line rating d Turn VOLTAGE controls fully clockwise e Adjust CURRENT controls until front panel am meter reads exactly maximum rated output current lowest current range for Models 6466C and 6483C f Read and record voltage indicated on differential voltmeter g Adjust variable auto transformer for high line input 10 of line rating h Reading on differential voltmeter should not vary from reading recorded in Step f by more than Model Variation uVdc 6464C 100 6466C 110 6469C 100 6472 100 6475 100 6477 100 6479 70 6483 166 5 6 5 35 TROUBLESHOOTING 5 36 Before attempting to troubleshoot this instrument ensure that the fault is with the instrument and not with an associated circuit The performance test Paragraph 5 5 en ables this to be determined without having to remove the instrument from the cabinet 5 37 A good understanding of the principles of operation is a helpful aid in troubleshooting and it is recommended that the reader review Section IV of the manual bef
82. hin the given level of the nominal output voltage following a load change from full load to half load or half load to full load 5 24 Transient recovery time may be measured at any in put line voltage combined with any output voltage and load current within rating 5 25 Ahand operated switch is used to switch from full load to half load and the resultant one shot displays are ob served on an oscilloscope 5 26 To check the transient recovery time proceed as fol lows a Connect test setup shown in Figure 5 4 POWER SUPPLY UNDER TEST OSCILLOSCCPE Ru BRL OHMS I 0 016 0 072 0 240 NOTE VALUES OF Ry AND Rio ARE SELECTED TO PROVIDE FULL OR HALF THE CURRENT RATING OF THE SUPPLY DEPENDING ON THE POSITION OF 51 POWER RATINGS ARE SKW FOR EACH RESISTOR 0 850 2 200 8 800 17 000 _ 80 000 Figure 5 4 Transient Recovery Time Test Setup b Turn CURRENT controls fully clockwise Turn on supply and adjust VOLTAGE controls un til front pane ammeter indicates haif the rated output cur rent d Close and open switch S1 several times and observe oscilloscope display Starting from the major graticule division represen tative of time zero count to the right either 50 milliseconds or 100 milliseconds and vertically y millivolts Recovery should be within the tolerances of y1 or y2 as shown in Figure 5 5 Enom y VOLTS
83. hooting procedures out lined in the subsequent paragraphs However if the unit fails one of the performance tests or the unit is unstable but otherwise appears to operate normally it is more expe dient for the technician to refer to the miscellaneous trou bles shown in Table 5 3 For all other troubles proceed as directed in the following paragraphs 5 43 Initial Setup Proceed as follows before attempting to troubleshoot the instrument 1 Troubleshooting is more effective if the unit is 3 Before turning on the supply set the front panel operated in the normal mode local sensing local program CURRENT controls maximum cew and the VOLTAGE con ming Strap the rear terminals as shown in Figure 3 2 trols to mid range Proceed to overall troubleshooting tree 2 With the supply off disconnect all loads from the Figure 5 8 unit Table 5 2 Reference and Bias Voltages Refer to Schematic for Test Point Locations METER METER NORMAL NORMAL COMMON POSITIVE RIPPLE P P PROBABLE CAUSE Table 5 3 Miscellaneous Troubles SYMPTOM PROBABLE CAUSE High Ripple Check operating setup for ground loops b Check reference voltages Table 5 2 for excessive ripple Supply crossing over to constant current operation under load ed conditions Check current limit setting or constant current comparator circuit Paragraph 5 47 Poor Line Regulation a Improper measurement technique Paragraph
84. igin is approximately 12 4V see Figure 4 3 The waveform on the base of each blocking oscillator is mainly the result of internal generators A2R28 2 4 4 4 BASE BLK OSC 22 EMITTER BLK Figure 4 3 SCR Firing Circuit Timing Diagram 1 100 A2C14 and A1R120 A2C24 which produce an 11msec wide rectangular shaped waveform The 5 6msec wide negative portion is flattened by the action of clamping diodes CR6 CR16 and CR26 The positive going emitter voltage rises to meet the base voltage and when the base emitter bias reaches about 0 6Vdc the applicable transistor O1 O2 or Q3 becomes forward biased initiating blocking oscillator action Regenerative coupling between the collector and base windings of each transformer 17 T8 and T9 rap idly drives the transistor into full conduction where it re mains for about 50usec until the transformer becomes saturated At this time the collapsing magnetic field returns the blocking oscillator to the nonconducting state 4 37 The firing pulses are taken from the output winding of each transformer and applied between the gate and cathode of the appropriate SCR Diodes CR2 CR12 and CR22 con nected across the output windings are used to damp out negative overshoot Resistors R1 R11 and R21 provide bleed path for current flowing out of the SCR gate terminal while diodes CR1 CR11 and CR21 block the voltage estab lished by the gate current from reaching the output
85. ions 1 1 1 7 Options 1 9 Accessories ate 1 11 Instrument Manual Identification 122 1 14 Ordering Additional Manuals citi esses aN 1 2 INSTALLATION 22 1 2 1 Initial Inspection 2 1 2 3 Mechanical Check 22 41 2 5 Electrical Check 2 7 Installation Data 2 9 Location 2 11 Outline Diagram 2 13 Rack Mounting 2 15 Input Power Requirements 2 20 208 230Vac Conversion 2 22 380 400Vac Conversion 2 30 50Hz Ac Input Option 005 2 32 Repackaging for Shipment soe e eee dc cerne loc etai OPERATING INSTRUCTIONS ae det 3 1 Turn On Checkout Procedure es 3 1 3 3 Operating Modes es 3 2 3 5 Normal Operating Mode 2 3 7 Constant Voltage 3 2 3 9 3 11 3 13 3 15 3 18 3 21 3 23 3 25 3 26 3 34 3 40 3 45 3 48 3 53 3 58 3 62 3 63 Constant Current No Load Operation Output Ranges Models 6466C and 6483C Only Connecting Load Grounding Operation Beyond Rated Output Protection Circuits Optional Operating Modes Remote Programming Constant Voltage Remote Programming Constant Current Remote Sensing Auto Parallel Operation Auto Series Operation Battery Charging Battery Discharging Special Operating Considerations Pulse Loading 32 33 es 3 3 3 3 33 3 3 Section TABLE OF CONTENTS Continued PRINCIPLES OF OPERATION
86. istor is used the res stance value actually programming the supply is the parallel combination of the remote programming resistance and the resistor across the programming terminals 3 38 Voltage Programming With Gain Figure 3 6 The power supply output current can be programmed using an external voltage source with variable gain by utilizing the strapping pattern shown in Figure 3 6 In this mode the output current will vary linearly from 0 to maximum rating when the voltage source is programmed from 0 to 6 2 volts The vaiue of the voltage source appearing across terminals 9 and A10 should not exceed 7 4Vdc if possible damage to the instrument is to be avoided 3 39 External resistor Rp should have stable low noise and low temperature coefficient less than 30ppm per de gree Centigrade characteristics in order to maintain the stability and temperature specifications of the power supply AB MZ Alt AB A7 AG 5 M 45 5 A2 AL AD 421212191442 leleleleleleleleiele Rp VOLTAGE k SOURCE 2 NOMINAL 0 6 2 VDC Figure 3 6 Remote Voltage Programming Non Unity Gain Constant Current Note that it is possible to use the front panel current con trols already in the supply and R4 as the control Rp by simply removing the external Rp and strapping ter minals 5 and A6 together 3 40 Remote Sensing Figure 3 7 3 41 Remote sensing is used
87. it They are not fastened with mounting screws but are inserted into slots in the corner support posts 5 68 Adjustment and Calibration 5 69 Adjustment and calibration may be required after per formance testing or troubleshooting The entire calibration 5 12 procedure should be performed after semiconductor in the feedback loop is replaced The adjustments are present ed in the proper sequence and the entire procedure takes only only about 15 minutes to accomplish 5 70 Meter Zero 5 71 pointer of each meter must rest on the zero cali bration mark on the meter scale when the instrument is at normal operating temperature resting in its normal opera ting position and turned off To zero set the meter proceed as follows a Connect load resistor of value shown in Figure 5 1 b Turn on instrument and allow it to come up to nor mal operating temperature about 30 minutes c Turn instrument off Wait one minute for power supply capacitors to discharge completely d Insert sharp pointed object pen point or awl into small indentation near top of round black plastic disc locat ed directly below meter face Rotate plastic disc clockwise until meter reads zero then rotate counterclockwise slightly in order to free adjust ment screw from meter suspension Pointer should not move during latter part of adjustment 5 72 Output Ripple Preliminary Adjustment 5 73 Before making any further adjustments it is
88. ment is not an ideal representation of the noise since fairly high output noise spikes of short duration can be present in the ripple without appreciably increasing the rms val e 5 17 Figure 5 2 shows the recommended method of mea suring ripple using a differential scope If desired two single conductor shielded cables may be substituted in place of the shielded two wire cable with equal success Because of its common mode rejection a differential oscilloscope displays only the difference in signal between its two vertical input terminals thus ignoring the effects of any common mode signa produced by the difference in the ac potential be tween the power supply case and scope case Before using a differential input scope in this manner however it is imper ative that the common mode rejection capability of the scope be verified by shorting together its two input leads at the power supply and observing the trace on the CRT If this trace is a straight line then the scope is properly ignor ing any common mode signal present If this trace is not a straight line then the scope is not rejecting the ground sig nal and must be realigned in accordance with the manufac turer s instructions until proper common mode rejection is attained 5 18 Although for this measurement the negative busbar is connected to chassis ground the user should bear in mind that neither busbar should be connected to chassis an actual operational setup refe
89. meter across output of A1U1 between TP9 and terminal A7 Ensure that jumper A1R149 is removed d Next turn CURRENT controls fully clockwise and VOLTAGE controls fully counterclockwise Turn on power supply and after 10 to 20 seconds turn on delay observe voltmeter reading f Voltmeter should read 40 8 0 08Vdc with VOLT AGE controls fully If it does proceed to next step If it does not check A1UT and associated components includ ing VOLTAGE controls R1 and R2 on front panel REAR TERMINAL BOARD REMOVE JUMPER TO CONSTANT VOLTAGE COMPARATOR TO t CONSTANT CURRENT COMPARATOR mes REMOVE JUMPER Figure 5 9 Open Loop Test Setup Amplifier Circuit 5 9 g Rotate VOLTAGE controls fully cw and again ob serve voltmeter h Voltmeter should read 11 1 1Vdc with VOLT AGE controls fully cw If it does proceed to next portion of test If it does not check A1U1 and associated compo nents including the front panel VOLTAGE controls 5 47 Constant Current Comparator To test the constant current comparator circuit A1U2 and associated compo nents proceed as follows a Connect test setup of Figure 5 9 b Connect de voltmeter across output of constant current comparator section of A1U2 between TP10 and terminal A7 c Turn VOLTAGE and CURRENT controls fully cw Ensure that circuit is open loop jumper A1R149 removed d Turn on supply no l
90. n terminals via a pair of twisted or shielded wires and each load should be sepa rately connected to the remote distribution terminals For this case remote sensing should be used Refer to Para graph 3 40 3 18 Grounding 3 19 Positive or negative output voltages can be obtained from the supply by grounding either output bus If the output is floated neither output bus grounded it can be operated up to 100Vdc above ground 300Vdc above ground for Models 6475C 6477C and 6479C 3 3 3 20 When grouriding the output the customer s ground must be used and connected to the desired output bus on the supply Do not ground the output at the supply s chassis or at the ac ground terminal on the rear of the supply These points are at safety ground and are not the neutral of the power source refer to Section 11 By fol lowing these recommendations and running a separate lead from each output bus to the load the user will be doubly certain that no load current will flow through the ac input wires to the supply 321 Operation Beyond Rated Output 3 22 The shaded area on the front panel meter face indi cates the approximate amount of output voltage or current that may be available in excess of the normal rated output Although the supply can be operated in this shaded region without being damaged it cannot be guaranteed to meet all of its performance specifications 3 23 Protection Circuits 3 24 This supply contains an internal
91. nc Amphenol Corp Amphenol Controls Div Janesville Wis Industrial Retaining Ring Co Irvington N J IMC Magnetics Corp Eastern Div Westbury N Y Sealectro Corp Mamaroneck N Y ETC Inc Cleveland Ohio Intemational Electronic Research Corp Burbank Calif Boston Mass Franklin Chicago Ill Renbrandt Inc DESIG DESCRIPTIONT H PART NO nat HP PART NO m C4 C6 C8 C10 c11 C15 C16 C17 C18 C19 C20 C21 C22 C23 C25 C26 C27 C28 C30 C31 C34 35 C36 C38 C39 C44 45 C46 C49 C52 C53 C54 C55 CR1 2 CR3 5 7 CR13 16 CR19 22 CR23 25 CR26 CR27 CR28 33 CR34 CR35 CR38 41 43 45 48 50 53 CR54 57 Table 6 4 Replaceable Parts Amplifier Board fxd mylar 001uF 200Vdc fxd ceramic 02uF 2000Vdc fxd mylar 1uF 200Vdc fxd tantalum 22uF 35Vdc fxd ceramic 015 1000V fxd tantalum 22uF 35V fxd ceramic 024 2000Vdc fxd tantalum 4 7uF 35V fxd ceramic 024 600Vdc fxd ceramic OiuF 500Vdc fxd tantalum 4 7uF 35V fxd tantalum 1uF 35V fxd tantalum 4 7uF 35V fxd ceramic O1uF 500Vdc fxd tantalum 1uF 35V fxd tantalum 68uF 15V fxd elect 200uF 65V fxd tantalum 4 7uF 35V fxd tantalum 68uF 15V fxd tantalum 224F 35V fxd elect 14 F 50V fxd ceramic 1uF 50Vdc fxd tantalum 84F 15V fxd mica 30pF 300Vdc fxd mylar 1uF 200Vdc fxd ceramic O1uF 500Vdc fxd tantalum 68uF 15V fxd mica 30pF 300Vdc fxd mylar 200V
92. nimum Operating threshold below which turn on of either 45 or both wiii not occur This threshold Point varies and determined by the inherent characteristics of both the Circuit and the SCR of interest 4 44 When the supply is delivering Medium and high ox power each SCR conducts once during every ac input c 445 Constant Voltage Comparator 446 This circuit Consists of the front panel Programming resistors R1 and 2 differential amplifier stage A1U1 and associated components and a constant current source 101 An integrated circuit is used for the differential am plifier to minimize differential voltages due to mismatched transistors and thermal differentials 4 47 The Constant voltage comparator continuously com Pares the voltage drop across the VOLTAGE controls with the output voitage and if a difference exists produces an error voltage whose amplitude is Proportional to this differ 4 48 One input of the differential amplifier pin 1 is con input of the differential amplifier pin 10 is connected toa summing point terminal 2 at the junction of the pro gramming resistors and resistor R6 Instantaneous changes in the output voltage or changes in the voltage at the sum ming point due to manipulation of the VOLTAGE controls Diodes CR1 and CR2 prevent excessive voltage excursions from over driving the differential amplifier 4 50 During constant voltage operation the programming current flowing through th
93. nit shuts 5 15 SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts Table 6 4 lists parts in alpha numeric order by reference designators and provides the following information a Reference Designators Refer to Table 6 1 b Description Refer to Table 6 2 for ab breviations Total Quantity Given only the first time the part number is listed except in instruments containing many sub modular assemblies in which case the TQ appears the first time the part number is listed in each assembly d Manufacturer s Part Number or Type e Manufacturer s Federal Supply Code Num ber Refer to Table 6 3 for manufacturer s name and address f Hewlett Packard Part Number g Recommended Spare Parts Quantity RS for complete maintenance of one instrument during one year of isolated service h Parts not identified by a reference desig nator are listed at the end of Table 6 4 under Me chanical and or Miscellaneous The former consists of parts belonging to and grouped by individual as semblies the latter consists of all parts not im mediately associated with an assembly 6 3 ORDERING INFORMATION 6 4 To order a replacement part address order or inquiry to your local Hewlett Packard sales office see lists at rear of this manual for addresses Specify the following information for each part Model complete serial number and any Option or Special
94. nstru ment or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmen tal specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRAN TIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HP SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE Product maintenance agreements and other customer assistance agreements are available for Hewlett Packard pro ducts For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are prov ded at the back of this manual DC POWER SUPPLY SCR 10 SERIES MODEL 6483C OPERATING AND SERVICE MANUAL FOR SERIALS 1 0101 AND ABOVE For Serials Above 1F0101 a change page may be included HP Part No 06483 90003 Printed June 1971 Section GENERAL INFORMATION TABLE OF CONTENTS Page 22141 1 1 Description 1 1 1 5 Specificat
95. nt voltage programming coefficient refer to Specifica tions Table 1 1 The programming coefficient is determined by the programming current This current is factory adjusted to within 1 If greater programming accuracy is required it be achieved by adjusting A1R9 as discussed in Para graph 5 76 Al4 Al2 CIE oje AIO A9 AB AT AG AS A4 5 5 A3 A2 AO GE Figure 3 3 Remote Resistance Programming Constant Voltage 3 29 The output voltage of the supply should be 0 10mV when zero ohms is connected across the programming termi nals If a zero ohm voltage closer to zero than this is required it may be achieved by inserting and adjusting A1R11 as dis cussed in Paragraph 5 75 3 30 To maintain the stability and temperature coefficient of the power supply use programming resistors that have stable low noise and low temperature coefficient less than 30ppm per degree Centigrade characteristics switch can be used in conjunction with various resistance values in or der to obtain discrete output voltages The switch should have make before break contacts to avoid momentarily opening the programming terminals during the switching interval Ald All AB AT AG 5 AG 5 5 Al AO glaleleleigielelela gle 2191212 VOLTAGE SOURCE NOTE JUMPER STRAP ON BOARD Al MUST BE REMOVED FOR THIS MODE
96. oad connected and observe voltmeter reading after turn on delay period Voltmeter should read 7 8 0 78Vdc with CUR RENT controls fully cw it does proceed to next step If it does not check A1U2 and associated components includ ing front panel CURRENT controls f Rotate CURRENT controls fully and observe voltmeter reading 9 Voltmeter should read 3 1 0 31Vdc with CUR RENT controls fully If it does proceed to next portion of test If it does not check A1U2 and associated compo nents 5 48 Error Amplifier This test checks the error amplifier A1U3 and all of the protection circuits connected to it s input First the output of the amplifier is checked If this is unsatisfactory the input to the amplifier is measured to determine if one of the protection circuits is the cause of the malfunction To perform this test proceed as follows Use test setup of Figure 5 9 Ensure that circuit is open loop jumper ATR149 removed b Connect dc voltmeter across output of A1U3 be tween TP8 and terminal A7 c Rotate VOLTAGE and CURRENT controls fully cw d Turn on supply and observe voltmeter reading after turn on delay Voltmeter should read 11 1 1Vdc If it does proceed to next step f If it does not check input voltage as directed in Step g f Rotate VOLTAGE controls fully ccw and observe voltmeter Reading should 11 1 1Vdc If it is error amplifier and front end circuits
97. of R51 VR3 C22 R50 anode A1R46 Change A1R46 to 27KQ 45 1 2W Part No 0686 2735 A1R50 Change ATR5O to 43KQ 55 1 2W HP Part No 0686 4335 CHANGE 3 the replaceable parts table under Main Frame Electrical and on the schematic add C19 8uF 370WVac HP Part No 0160 4022 C19 is mounted across fan B1 CHANGE 4 In parts list under Mechanical change HP Part No of heat sink SCR CR1 CR6 to 5020 8450 qty 3 In parts list under Options 003 and 031 change HP Part No of 6 to 1884 0226 In parts list under Main Frame Electrical change HP Part No of CR4 CR6 to 1884 0225 Manual Changes Mode 6483 Manual HP Part No 06483 90003 Page 2 ERRATA Add the following at the end of paragraph 2 17 Fuses F1 F2 and F3 70A each in the phase A B and C lines respec tively are located inside the unit behind the rear panel Fuses F4 F5 and F6 300mA each connected in the refer ence supply power input circuit are located on the rear panel Fuses F7 and F8 1 6A each in the phase B and C input lines to the T5 primary windings are also located on the rear panel In paragraphs 4 18 and 4 24 change 40 to 140 In Figure 3 5 connect programming resistor between term inals A4 and as shown below Programming resistor shouid not be connected to terminal 8 AM ASA AI AT AS A5 A4 45 S PROGRAMMING RESISTOR 805 Figure 3 5 Remo
98. oltmeter DC Voltmeter Sensitivity 1mV full scale deflec HP 412A tion min Accuracy 196 Resistive Value see Figure 5 1 10kW rating Power supply load resis Loads tors Measure dc voltages Amprobe Model RS 3 Current Accuracy 1 Provides 50mV at Measure output current Simpson Switchboard Sampling rated output current Values see calibrate ammeter Type Shunts 6500 or Resistors Figure 5 7 6700 Series Shunts 5 1 5 5 PERFORMANCE TEST 5 6 following test can be used as an incoming inspec tion check and appropriate portions of the test can be re peated either to check the operation of the instrument after repairs or for periodic maintenance tests The tests are per formed using the rated 3 phase input power source If the correct result is not obtained for a particular check do not adjust any internal controls proceed to troubleshooting Paragraph 5 35 5 7 Constant Voltage Tests 5 8 If maximum accuracy is to be obtained in the follow ing measurements the measuring devices must be connect ed to the sensing terminals S S This is particularly im portant when measuring the transient response regulation or ripple of the power supply A measurement made across the load includes the impedance of the leads to the load and such lead lengths can easily have an impedance several orders of magnitude greater than the supply impedance thus invalidating the measurement
99. on of the protective earth terminal will cause a potential shock hazard that could result in personal injury If the instrument is to be energized via an external autotransformer for voltage reduction be certain that the autotransformer common terminal is connected to the neutral earthed pole of the ac power lines supply mains INPUT POWER MUST BE SWITCH CONNECTED For instruments without a built in line switch the input power lines must contain a switch or another adequate means for disconnecting the instrument from the ac power lines supply mains DO NOT OPERATE AN EXPLOSIVE ATMOSPHERE Do not operate the instrument in the presence of flammable gases or fumes KEEP AWAY FROM LIVE CIRCUITS Operating personnel must not remove instrument covers Component replacement and internal adjustments must be made by qualified service personnel Do not replace com ponents with power cable connected Under certain condi tions dangerous voltages may exist even with the power cable removed To avoid injuries always disconnect power discharge circuits and remove external voltage sources before touching components DO NOT SERVICE OR ADJUST ALONE Do not attempt internal service or adjustment unless another person capable of rendering first aid and resuscitation is present DO NOT EXCEED INPUT RATINGS This instrument may be equipped with a line filter to reduce electromagnetic interference and must be connected to a pro
100. ore at tempting to troubleshoot the unit in detail Once the prin ciples of operation are understood refer to the overall trou bleshooting procedures in Paragraph 5 40 to locate the symptom and probable cause 5 38 The schematic diagram at the rear of the manual con tains normal voltage readings taken at various points within the circuits These voltages are positioned adjacent to the applicable test points identified by encircled numbers The component location diagrams Figures 7 1 through 7 5 at the rear of the manua should be consulted to determine the location of components and test points 5 39 If a defective component is located replace it and re conduct the performance test When a component is re placed refer to the repair and replacements Paragraph 5 54 and adjustment and calibration Paragraph 5 68 sec tions of this manual 5 40 Overall Troubleshooting Procedure 5 41 To locate the cause of trouble follow steps 1 2 and 3 in sequence 1 Check for obvious troubles such as input power failure loose or incotrect strapping on rear terminals blown fuses or defective meter 2 In almost all cases the trouble can be caused by the dc bias or reference voltages thus it is a good practice to check voltages in Table 5 2 before proceeding with Step 3 3 Disconnect load and proceed to the next Paras graph 5 42 5 42 General Any trouble with the supply can be isolated by following the overall troubles
101. ormal waveform a Proceed to Step 6 5 Abnormal waveform b Component in A202 base circuit de fective or phase B portion of current balance circuit defective check 104 and assoc ated components 5 10 Table 5 4 Firing Circuit Troubleshooting Continued Repeat Step 3 except check waveform in A2Q2 emitter cir cuit TP26 STEP ACTION RESPONSE a Normal waveform a Abnormal waveform b PROBABLE CAUSE Proceed to Step 7 Component in emitter circuit defective Check A2C13 A2R17 and A2C11 Repeat Step 4 for firing of phase B blocking oscillator Check phase C base waveform A203 TP24 Turn external pot to negative end Repeat Steps 3 and 4 except check phase 203 wave forms Norma waveform a Abnormal waveform b Normal waveform Abnormal waveform Normal waveforms Abnormal wave form s 5 51 Crowbar Troubleshooting Units with Option 006 Only 5 52 Most crowbar faults fall into two general categories 1 the circuit crowbars CR37 CR38 fires at all times even when the trip point is adjusted to maximum or 2 the crowbar is completely inoperative at any trip point setting Condition number one will result in zero or very low out put voltage because the SCR crowbar will fire every time power is applied to the unit For condition number two no overvoltage protection is provided and the out
102. overload protection circuit which shuts off the supply in the event of a pro longed overcurrent or overtemperature condition details given in Section IV This circuit also illuminates the appli cable indicator lamp PROTECT or TEMPERATURE on the front panel If one of these lamps should light the operator should set the LINE 3 switch to off and turn the VOLTAGE and CURRENT con trols to zero CCW Next the unit should be turned back on If the overload lamp lights again turn the unit off and proceed to Section V Troubleshooting If the lamp does not light the overload may have been caused by a line transient or an improper connection at the rear barrier strip Ensure that all screws on the rear barrier strip are tight and that the strapping pattern agrees with the desired operation 325 OPTIONAL OPERATING MODES 326 Remote Programming Constant Voltage 3 27 The constant voltage output of the power supply can be programmed controlled from a remote location if required Either a resistance or voltage source can be used as the programming device The wires connecting the pro gramming terminals of the supply to the remote program ming device should be twisted or shielded to reduce noise pickup The VOLTAGE controls on the front panel are automatically disabled by the following procedures 3 28 Resistance Programming Figure 3 3 In this mode the output voltage will vary at a rate determined by the con sta
103. ows Connect 10kW ac variac between ac input source and power supply line input b Connect an ac voltmeter between any ac input two phases Turn on supply no load connected and rotate VOLTAGE controls for maximum rated output voltage d Using variac reduce ac input line until power sup ply dc output voltage falls to near O volts Record ac volt meter reading at power supply turn off point It should read as follows AC Line Voltage Normal Line Voltage at Trip Point 208 174 6Vac 230 192 6Vac 460 386 13Vac e If trip point is outside of tolerance turn off supply and replace A1R77 with decade resistance box f Adjust decade box so that trip point of Step d is satisfied 9 Replace suitable value resistor in A1R77 position as determined by decade box setting 5 92 Output Ripple Final Adjustment 5 03 This adjustment balances the output rippleby balanc ing the ac line currents phase B and C potentiometers A1R102 and A1R122 The method of adjustment depends on how closely the ac line to line voltages are balanced If 5 14 the three phase line voltages are balanced to within 3 of each other use the following adjustment procedure If the line voltages are balanced to within 3 to 8 maximum tolerable imbalance of each other use the second adjust ment procedure 5 94 Balance Adjustment Line to Line Imbalance Within 3 To make adjustment proceed as follows a Connect oscilloscope b
104. p Semicon ductor Prod Group Hicksville N Y Fenwal Elect Framingham Mass Corning Glass Works Electronic Components Div Raleigh N C Newark N J 12136 12615 12617 12697 13103 14493 14655 Palo Alto California 6 2 Table 6 3 CODE No MANUFACTURER ADDRESS Delco Radio Div of General Motors Corp Kokomo Ind Atlantic Semiconductors Inc Asbury Park N J Fairchild Camera and Instrument Corp Semiconductor Div Transducer Plant Mountain View Calif Daven Div Thomas A Edison Industries McGraw Edison Co Orange N J Signetics Corp Sunnyvale Calif Bendix Corp The Navigation and Control Div Teterboro J Electra Midland Corp Mineral Wells Texas Fansteel Metallurgical Corp No Chicago Ill Union Carbide Corp Electronics Div Mountain View Calif UID Electronics Corp Hollywood Fla Pamotor Inc Pampa Texas General Electric Co Schenectady N Y General Electric Co Lamp Div of Con sumer Prod Group Nela Park Cleveland Ohio General Radio Co West Concord Mass LTV Electrosystems Inc Memcor Com ponents Operations Huntington Ind Dynacool Mfg Co Inc Saugerties N Y National Semiconductor Corp Santa Clara Calif Palo Alto Calif Kenilworth N J 17870 18324 19315 19701 21520 22229 22753 23936 24446 24455 24655 24681 26982 27014 28480 28520 28875 Hewlett Packard Co Heyman Mfg
105. panel voltmeter 2 accuracy or a more precise voltage standard The unit may then be connected to the battery terminals positive to positive and negative to negative 3 56 Protection diode prevents charged battery from discharging into the supply if the supply is turned off AIZ AIE AIO A9 AB AG PIC 16 CHARGING T lc BATTERY FULL CHARGE VOLTAGE 1 CONSTANT CHARGE CURRENT BATTERY VOLTAGE AT WHICH CHARGE RATE WILL BEGIN TO TAPER WITH INSERTION OF Rr ap ote 3 10 Battery Charging large battery connected as load presents large capacitance across the output terminals This capacitance could cause the supply to oscil late particularly if remote sensing is employed To stabilize the supply potentiometer A1R48 may be readjusted increase resistance as out lined in Paragraph 5 88 If the maximum resist ance of R48 is not sufficient jumper R58 can be removed and an additional resistance sub stituted in series with the potentiometer 3 57 Taper Charge For charging lead acid cells the charg ing current should be reduced when the battery is nearing completion of its charge This is accomplished by inserting small resistance RT in series with one of the load leads from the supply to the battery which alters the normally rectangular charging plot in such
106. perly grounded receptacle to minimize electric shock hazard Operation at line voltages or frequencies in excess of those stated on the data plate may cause leakage currents in excess of 5 0 mA peak SAFETY SYMBOLS Instruction manual symbol the product will be marked with this symbol when it is necessary for the user to refer to the instruction manual refer to Table of Contents gt indicates hazardous voltages Indicate earth ground terminal E M The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly per formed or adhered to could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met WARNING The CAUTION sign denotes a hazard It CAUTION calls attention to an operating pro cedure or the like which if not correct ly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond CAUTION sign until the indicated con ditions are fully understood and met DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT Because of the danger of introducing additional hazards do not install substitute parts or perform any unauthorized modification to the instrument Return the instrument to a Hewlett Packard Sales and Service Office for service and repair to ensure that safety features are maintained Instruments which appear
107. pulse loading may exceed the preset limit and cause cross over to occur If this crossover limiting is not desired set the preset limit for the peak requirement and not the average SECTION IV PRINCIPLES OF OPERATION gt TEMPERATURE OVERCURRENT CURRENT PROTECTION BALANCE CROWBAR uit T BUS SCR SOUT BUS DENOTES CONSTANT VOLTAGE FEEDBACK PATH Tm DENOTES CONSTANT CURRENT FEEDBACK PATH FIRING CIRCUITS EARLY OVER CURRENT PROTECTION OVERCURRENT PROTECTION 24V UNREG REFERENCE dud E 82 SUPPLY 6 3V RAT 12 4 COMPARATOR CURRENT PHASE CONTROLS PROTECTION CURRENT SAMPLING RESISTOR Our Bus PHASE POWER ra REGULATOR TRANS FILTER 3 PHASE PHASE 91 FORMER RECTIFIER AC INPUT XT prase c 007 BUS CONTACTOR VOLTAGE CONTROLS CONSTANT VOLTAGE COMPARATOR Figure 4 1 Overail Block Diagram 4 1 OVERALL BLOCK DIAGRAM DISCUSSION 4 2 major circuits of the power supply are shown on the overall block diagram of Figure 4 1 The three phase ac input passes through normally closed contacts of contactor K2 to the SCR regulator circuit Under normal operating conditions K2 is maintained energized by the overload cir Cuit as will be explained later The regulator contains three SCR s on
108. put voltage will go high if a failure occurs in the power supply protec tion circuits 5 53 If condition one occurs crowbar always fired check all of the circuit transistors A207 through Q10 for possi ble shorts Also check the crowbar SCR s itself for a short If condition two occurs crowbar inoperative check tran sistors and SCR s for opens 5 54 REPAIR AND REPLACEMENT 5 55 Section VI of this manual contains a list of replace able parts If the part to be replaced does not have a stan dard manufacturers part number it is a special part and must be obtained directly from Hewlett Packard After re placing any semiconductor device refer to the adjustment procedures outlined later in this Section Proceed to Step 8 Check 202 and associated compo nents Check phase B SCR for open Proceed to Step 9 b Component in A203 base circuit de fective or phase C portion of current balance circuit defective 105 and associated components Firing circuit okay b Check applicable components in phase C stages 5 56 Air Filter 5 57 The air filter located on the lower front panel should be checked on a monthiy basis and cleaned if necessary To gain access to the filter turn off the unit and remove the six mounting screws the lower front panel Figure 1 1 The filter is mounted by four screws in back of the lower front panel With the filter removed access is also gained to
109. r supply output to 20 of rating and com pare line currents of two of input phases If unequal adjust R102 R122 f Continue to increase output voltage in 1096 steps adjusting R102 R122 if necessary Final adjustment is made at full rated output voltage 5 96 Line Overcurrent Protection 5 97 This adjustment sets the trip point of the overcurrent protection portion of the overload circuit When the trip point is exceeded input power is removed and the OVER CURRENT PROTECT lamp on the front panel is illumi nated Proceed as follows Connect dc voltmeter across 1 54 between emitter of A1Q11 and terminal A7 down b Connect decade resistance box between 12 4V and g Overload circuit is now adjusted Remove decade emitter of 1011 Set decade box to 00k initially box and operate supply normally Turn potentiometer A1R131 fully cow d Turn on supply no load connected e Decrease resistance of decade box until trip voltage NOTE read on dc voltmeter is as follows Nominal Line Vac Trip Voltage at 1011 Emitter For users with 208 380 or 400 Vac input lines 208 7 t 0 1Vdc the supply may trip before the 7 0 1Vdc trip 230 46 6 0 1Vdc voltage can be obtained If this occurs change 380 7 0 1Vde A1R127 to 20 9 1 1 8 and adjust decade 400 7 0 1 Vdc box for a trip voltage of 16 6 0 1Vdc instead 460 6 6 0 1Vdc of 7 Q 1Vac at emitter of 1011 f Adjust ATR 131 until circuit trips and u
110. r to Paragraph 3 19 5 19 To check the ripple output proceed as follows POWER SUPPLY OSCILLOSCOPE CORRECT METHOD OF MEASURING RIPPLE USING A DIFFERENTIAL SCOPE WITH FLOATING INPUT COMMON MODE REJECTION OF DIFFERENTIAL INPUT SCOPE IGNORES DIFFERENCE IN GROUND POTENTIAL OF POWER SUPPLY amp SCOPE SHIELDED TWO WIRE FURTHER REDUCES STRAY PICK UP ON SCOPE LEADS Figure 5 2 Ripple Test Setup Connect oscilloscope or rms voltmeter as shown Figure 5 2 b Turn CURRENT controls fully clockwise c Adjust VOLTAGE controls until front panel meter indicates maximum rated output voltage d The observed ripple should be less than the follow ing Model Rms Peak to Peak 6464C 80mV 1V 6466C 180mV 1V 6469C 180mV 1V 6472C 160mV 2V 6475C 220mV 2V 6477C 330mV 2V 6479C 300mV 2V 6483C 600mV 5V 5 20 Noise Spike Measurement When a high frequency spike measurement is being made an instrument of suffi cient bandwidth must be used an oscilloscope with a band width of 20MHz or more is adequate Measuring noise with an instrument that has insufficient bandwidth may conceal high frequency spikes detrimental to the load 5 21 The test setup illustrated in Figure 5 2 is generally not acceptable for measuring spikes 1 As shown in Figure 5 3 two coax cables must be substituted for the shielded two wire cable 2 Impedance matching resistors must be included to eliminate standing waves and ca
111. rp Mt Vernon N Y 75915 Littlefuse Inc Des Plaines Ill 76381 Minnesota Mining and Mfg Co St Paul Minn 76385 Minor Rubber Inc Bloomfield N J 76487 James Millen Mfg Co Inc Malden Mass Use Code 71785 assigned to Cinch Mfg Co Chicago 6 3 76493 J Milier Co Compton Calif CODE NO 77068 77122 77147 77221 77252 77342 77630 77764 78189 78452 78488 78526 78553 78584 79136 79307 79727 79963 80031 80294 81042 81073 81483 81751 82099 82142 82219 82389 82647 82866 82877 82893 83058 83186 83298 83330 83385 83501 Table 6 3 MANUFACTURER ADDRESS Cinch City of Industry Calif Oak Mfg Co Div of Oak Electro Netics Corp Crystal Lake Ill Bendix Corp Electrodynamics Div Hollywood Calif Palnut Co Mountainside N J Patton MacGuyer Providence I Phaostron Instrument and Electronic South Pasadena Calif Philadelphia Steel and Wire Corp Philadelphia Pa American Machine and Foundry Co Potter and Brumfield Div Princeton Ind TRW Electronic Components Div Camden N J Resistance Products Co Harrisburg Pa Illinois Tool Works Inc Shakeproof Div Elgin Ill Everlock Chicago Inc Chicago 11 Stackpole Carbon Co St Marys Pa Stanwyck Winding Div San Fernando Electric Mfg Co Inc Newburgh Y Tinnerman Products Inc Cleveland Ohio Stewart Stamping Corp Yonkers
112. solder lug HP P N 0360 1645 TQ 6 Terminal strip two position HP P N 0360 1639 TQ 6 Add these components to the schematic in Figure 7 7 as shown below 845 CHANGE 12 In the replaceable parts list page 6 10 change C17 to 047uF 20 8 4000V HP P N 0160 4200 CHANGE 13 In the parts list on pages 6 6 and 6 13 change CR58 and CR36 to HP P N 1884 0302 ERRATA On page 5 13 paragraph 5 75 step and paragraph 5 76 step a and change S to S On page 5 13 paragraph 5 76 step c change the resistor values for the 6472 75 77 79 and 83 to the values shown below MODEL VALUE ohms 6472 19 2K 6475C 33K 6477C 66K 6479C 90K 6483C 180K On page 3 1 after the NOTE on page 5 2 after paragraph 5 9 add the following WARNING and Table WARNING Violent arcing could occur if terminals are shorted at any time with power on Turn AC power off and wait one minute before shorting Hazardous voltage may remain on terminals after AC power is removed Check terminal voltages before touching gt MODEL VOLTAGE Maximum allowable terminal voltage before terminals are shorted 6464C 5V 6466C 6v 6469C 8v 6472 10 6475 ITV 6477C 30v 6479 30V 6483C 42V page 3 1 paragraph 3 2 change step to read as follows To check out constant current circuit first turn off suppiy and allow the output voltage to bleed down Then short circuit the output bus
113. st points which are identified by encircled num bers on the schematic u0ne207 1uauoduio pieog Ly L g anba 9NINWYHSONd 39V110 310W3u BO 9NIONVHOSIGO A8311v8 31436 o10nv 15 28 J3dWnf 1531 4001 N3dO 303 03A0W3H 6719 7 2 3015 409 305 1119813 dm Li e s CECE mane i i E ast sna Figure 7 2 A2 Firing Board Component Location Figure 7 3 Control Board Component Location 7 4 NOTE FINNED HEAT SINK USED ON LOWER VOLTAGE MODELS BUT DIODES ARE IDENTICALLY POSITIONED NOTE BUS BARS ARE MOUNTED DIFFERENTLY ON LOWER VOLTAGE MODELS OUTPUT CAPACITORS LOCATED ON OTHER SIDE NOTE THIS PHOTO APPLIES DIRECTLY TO THE HIGHER VOLTAGE MODELS OF THE SCR 10 SERIES FOR LOWER VOLTAGE MODELS 6464C 6466 AND 6469C COMPONENT LOCATIONS ARE IDENTICAL BUT THE PHYSICAL APPEARANCE OF THE UNIT VARIES SLIGHTLY j Figure 7 4 Chassis Side View Component Location 75 Figure 7 5 View Board and Component Location 7 6 MEASUREMENT CONDITIONS 1 ALL MEASUREMENTS REFERENCED TO CIRCUIT COMMON TERMINAL 7 UNLESS OTHERWISE INOICATED 2 AMPLITUDES ARE TYPICAL 310 3 OSCILLOSCOPE DC COUPLED HORIZONTAL PERIOD 15 2MILLISECONDS CM 4 WAVEFORMS TAKEN WITH LOOP OPEN AND NO LOAD CONNECTED EXCEPT FOR BOTTOM TWO WAVEFORMS FIRING POINT TP22 23
114. t keeping CR58 in conduc tion and illuminating the OVERCURRENT PROTECT lamp through closed contacts of It requires approximately one second for the relays to deenergize and shut off power 4 82 Overload relay K1 is also deenergized if the crowbar circuit optional circuit is activated The pulse is applied to an additional winding of T6 to SCR CR58 The OVERCUR RENT PROTECT lamp will also be illuminated in this case together with the CROWBAR lamp 4 83 After an overload occurs and the condition has been corrected the operator must set the LINE switch to OFF wait at least 3 seconds and then set the LINE switch to ON 4 84 Overtemperature Circuit The overtemperature com ponents are TC1 and parallel connected TEMPERATURE lamp DS3 Thermal switch TC1 is closed without an over temperature condition The near short circuit created by TC1 across TEMPERATURE lamp DS3 keeps the lamp off during this condition If the heat sink temperature rises above the limits specified in Paragraph 4 25 TC1 opens 48 deenergizing contactor K2 and allowing the TEMPERA TURE lamp to light When the unit cools sufficiently TC1 again closes 485 Reference Supply 4 86 The reference supply is a setf contained feedback sup ply employing a series regulator The supply provides stable reference voltages which are used throughout the unit 4 87 The reference voltages are all derived from a full wave rectifier CR28 through CR33 and filter C25 whi
115. t sink running from front to rear of the unit The top of these components are accessible from the top of the unit Figure 7 5 and the bottom of the components can be reached from the rear or side of the unit When replacing an SCR or diode use Wakefield Type 120 HP Part No 6040 0239 thermal compound to obtain the proper heat conduc tion 5 64 When fastening an SCR to the heat sink the use of a torque wrench is recommended Too loose a torque may re sult in a poor connection between the SCR and heat sink If the SCR is tightened too hard the stud or nut may be strip ped and the SCR itself could be broken 5 65 The following list contains the torque recommenda tions for all of the SCR s used the SCR 10 Series 1 SCR s with inch mounting studs and nuts must be installed with a torque of approximately 20 inch pounds 2 SCR s with inch mounting studs without nuts tapped heatsink should be installed with a torque of ap proximately 30 inch pounds 3 SCR s with 3 8 inch studs and nuts should be tight ened to 110 inch pounds 4 SCR s with 3 8 inch studs without nuts should be tightened to 140 inch pounds 5 66 Location of Power Transformer Choke Out put Capacitors and Secondary Rectifiers 5 67 All of these components can be reached by removing the side covers see Figure 7 4 To remove the side covers the top cover must be removed first Then the side covers can be removed by pulling them up and away from un
116. t temperature does not ex ceed 500 2 11 Outline Diagram 2 12 Figure 2 1 illustrates the two basic outline shapes for power supplies of the SCR 10 Series IH FIL eee 182 24 1 28m 24 UB om zom T 26 08 I 1 EL See A MODELS 6464C 6466C AND 6469 B MODELS 6472 6475C 6477C 6479C AND 6483 Figure 2 1 Outline Diagram 2 1 2 13 Rack Mounting 2 14 To rack mount the unit Option 023 is installed at the factory The user receives the supply with rack ears attached to the side front of the unit The supply can then be mount ed in a standard 19 inch rack using standard mounting screws 2 15 INPUT POWER REQUIREMENTS 2 16 The input power is specified by the buyer in his ori ginal purchase contract using the appropriate option num ber Five input options are available Option 001 208 002 230Vac 003 460 031 380 and 032 400 ac All of the optional line voltages may vary within 10 2 17 All ac input connections are made at the rear terminal block a power cord and connector are not supplied with the unit The user should ensure that the ac input wires are of the proper gauge For example the line current is 5O amperes maximum for a 230Vac input dictating that each conductor be at least number
117. tage control setting When a load resistance is ap plied to the output terminals of the power supply the out put current increases while the output voltage remains con stant point D thus represents a typical constant voltage op erating point Further decreases in load resistance are ac companied by further increases in with no change in the output voltage until the output current reaches 1 value equal to the front panel current control setting At this point the supply automatically changes its mode of op eration and becomes a constant current source still further decreases in the value of load resistance are accompanied by OPEN CIRCUIT CONSTANT VOLTAGE f OPERATING REGION CONSTANT CURRENT gt d R Ro L gt Re RL Re 2 OPERATING REGION EouT SHORT CIRCUIT LOAD Is Eg FRONT PANEL VOLTAGE CONTROL SETTING 5 FRONT PANEL CURRENT CONTROL SETTING JES CRITICAL OR CROSSOVER VALUE Rc Tg LOAD RESISTOR Figure 4 2 Operating Locus of a CV CC Power Supply a drop in the supply output voltage with no accompanying change in the output current value With a short circuit across the output load terminals Es and EguT 0 4 8 crossover value of load resistance can be defined as 16 Adjustment of the front panel voltage and current controls permits this crossover resistance to be set to any desired val
118. te Resistance Programming Constant Current The standard colors for this instrument are now mint gray for front panel and olive gray for al other external surfaces Option X95 designates use of the former color scheme of light gray and blue gray Option A85 designates use of a light gray front panel with olive gray used for ali other external surfaces New part numbers are shown below DESCRIPTION STANDARD Fr nt Panel Assembly 06483 60004 Front Panel Lettered 06483 60013 Cover Top 5000 9417 Cover Side 2 5000 9418 Bottom Front Panel 5000 9447 Cover Output Busbar 5000 9467 Cover Barrier Strip 5000 9457 Bottom Rear Panel 5000 9466 Panel Rear 5000 9464 Mounting Plate 5000 9465 Pan Bottom Left 5000 9480 Bracket Heat Sink 5000 9481 Post Corner Frame 2 5020 8446 Bar Frame 2 5020 8448 Tray Capacitor 5000 9453 Cover Capacitor Tray 5000 9454 Tray 5000 9479 Ear Rack Mounting 2 Option 23 5020 8062 Front Panel Crowbar Option 5000 9382 CHANGE 5 The value of resistors A2R4 A2R14 and A2R24 has been changed to 1 3 to reduce a tendency toward oscillation when the supply s output is shorted On Page 6 9 of the parts list change the HP Part No for these resistors to 0686 1325 and also correct the firing ci rcuits on the Figure 7 7 schematic I i HP PART NO
119. ted this circuit injects a negative cutoff voltage directly into the fir ing circuits by passing the loop delay caused by the error amplifier 4 72 A voltage that is proportional to the line current is applied to stage A103 from a rectifier and filter shared by the overload circuit Without an overload transistor is conducting but not sufficiently to breakdown in its collector circuit Thus 102 is cutoff and the circuit is de activated The circuit becomes activated if the input line current rises to about 4076 of its normal peak value In this case the increased conduction of breaks down zener diode VR4 forward biasing CR19 and CR22 and permitting Q2 to conduct The negative output voltage is applied to the firing circuits halting SCR conduction until the output current falls to an acceptable level 4 73 Current Balance Circuit 4 74 This circuit controls the firing of the phase B and phase C SCR s so that the input currents on these lines are equal in amplitude to the input current on the phase A reference line 4 75 The current balancing circuit for each of the corrected phases B and C receives its input directly from the associ ated input wire which is run physically through the air core of input transformer 10 and 11 respectively Each input wire serves as the primary of its input transformer inducing the ac current flowing along that wire into the sec ondary winding The ac current wave
120. ted Circuit Primary SCR and Diode Replacement Location of Power Transformer Choke Output Capacitors and Secondary Rectifiers 5 12 Adjustment and Calibration Meter Zero iji SAFETY SUMMARY The following general safety precautions must be observed during all phases of operation service and repair of this instru ment Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design manufacture and intended use of the instrument Hewlett Packard Company assumes no liability for the customer s failure to comply with these requirements BEFORE APPLYING POWER Verify that the product is set to match the available line voltage and the correct fuse is installed GROUND THE INSTRUMENT This product is a Safety Class 1 instrument provided with a protective earth terminal To minimize shock hazard the in strument chassis and cabinet must be connected to an elec trical ground The instrument must be connected to the power supply mains through a three conductor power cable with the third wire firmly connected to an electrical ground safety ground at the power outlet For instruments designed to be hard wired to the ac power lines supply mains connect the protective earth terminal to a protective conductor before any other connection is made Any interruption of the protec tive grounding conductor or disconnecti
121. ter than the battery voltage 38 2 AS AT 6 A5 AG iss AB A2 AL AO le ele Ry Ep lq BUT MUST lt RATED OUTPUT VOLTAGE OF SUPPLY AND Ey EH BATTERY NOTE JUMPER STRAP PC BOARD Ai MUST BE REMOVED FOR BATTERY DISCHARING REFER TO TEXT Figure 3 11 Battery Discharging 3 61 The procedure for the connection of the components in this configuration is as follows a Turn off the power supply and rotate the cur rent control full counterclockwise The voltage control will be disconnected by step b b Remove the designated jumpers A2 to A3 and Board and connect 2 to the negative terminal of the battery through 10k resistor c Connect the negative terminal of the supply to the positive terminal of the battery d Insert Rx between the positive terminal of the sup ply and the negative terminal of the battery energize the supply and rotate the current control to the desired dis charge current as read on the front panel meter 3 62 SPECIAL OPERATING CONSIDERATIONS 3 63 Pulse Loading 3 64 The power supply will automatically cross over from constant voltage to constant current operation or the re verse in response to an increase over the preset limit in the output current or voltage respectively Although the preset limit may be set higher than the average output cur rent or voltage high peak currents or voltages as occur in
122. the cooling fan 5 58 Hinged Front Panel 5 59 The upper portion of the front pane is hinged and can be dropped down for servicing the front panel compo nents or the components on the front portion of the ampli fier P C board 1 To pull down the front panel remove the two mounting screws on the sides of the front panel Then grasp the top of the panel and pull out and down 5 60 Printed Circuit Boards 5 61 Figure 7 5 shows the location of the three main P C Boards A1 A2 and A3 of the unit with the top cover re moved The amplifier board A1 can be removed if neces sary by the following procedures Turn off unit and remove top cover b Pull down front panel previous paragraph To disconnect A1 board from two rear connectors for 2 and boards grasp the two plastic tabs on front of 1 board and slide board forward until free of 2 board connectors d To slide A1 board completely out of unit it may be necessary to disconnect the front panel from it s hinges To accomplish this disconnect the front panel safe ty ground wire from its ground tug f Next snap out hinges supporting the front panel Sufficient length in the front panel wiring is provided to en able this Now slide the A1 board forward until clear of unit 5 62 Primary SCR and Diode Replacement 5 63 The SCR regulators CR1 CR2 CR3 or primary di odes CR5 CR6 are mounted on top of the center hea
123. the master The master supply must be the most positive supply of the series The output CURRENT controls of the slave unit are operative and the current limit is equal to the lowest con trol setting any of the output CURRENT controls are set too low automatic crossover to constant current opera tion will occur and the output voltage will drop Remote sensing and programming can be used though the strapping arrangements shown in Figure 3 9 show local sensing and programming CAUTION Model 6483C of the SCR 10 Series cannot be operated in Auto Series because this supply can not be floated at more than 100 Vdc off ground However Auto Tracking can be utilized to obtain coordinated positive and negative volt ages if the center tap of the combination is grounded refer to Paragraph 3 52 3 50 In order to maintain the temperature coefficient and stability specifications of the power supply the external re sistors Rx shown in Figure 3 9 should be stable low noise low temperature coefficient less than 30ppm per de gree Centigrade resistors The value of each resistor is de pendent on the maximum voltage rating of the master supply The value of Rx is this voltage divided by the Con stant Voltage programming current of the slave supply 1 Kp where Kp is the resistance programming coefficient The voltage contribution of the slave is determined by its voltage control setting 3 51 Protection diodes CRs connected
124. tion proceed as follows a Connect test setup shown in Figure 5 1 b Connect variable auto transformer between input power source and power supply power input c Adjust variable auto transformer for low line input 10 of input rating d Turn CURRENT controls fully clockwise Turn on supply and adjust VOLTAGE controls un til front panel meter indicates exactly maximum rated out put voltage f Read and record voltage indicated on differential voltmeter g Adjust variable auto transformer for high line input 10 of input rating h Reading on differential voltmeter should not vary from reading recorded in Step f by more than Modet Variation mVdc 6464C 9 6466C 14 6469C 23 6472C 132 6475C 155 6477C 200 6479C 250 6483C 400 5 15 Ripple and Noise Definition The residual ac voltage superim the dc output of a regulated power supply Ripple and noise may be specified and measured in terms of its rms or preferably peak to peak value Ripple and noise measurement can be made at any input ac line voltage combined with any dc output voltage and load current within the supply s rating 5 16 The amount of ripple and noise that is present in the power supply output is measured either in terms of the rms or preferably peak to peak value The peak to peak mea surement is particularly important for applications where noise spikes could be detrimental to a sensitive load The rms measure
125. ue from 0 to If Rq is greater than Rc the supply is in constant voltage operation while if RI is less than RC the supply is in constant current operation 4 9 Current Balance Circuit 4 10 The current balance circuit maintains the rms ampti tude of the input current flowing in the phase B and phase C lines equal to input current flowing in the phase A refer ence line To accomplish this the circuit compares the cur rent in the phase B and C lines with that of the reference phase A If a difference exists the current balance circuit issues an error signal to the firing circuits The firing of the phase B or phase C SCR is then advanced or delayed in ac cordance with the polarity of the original difference signal Hence the current balance circuit allows the unit to oper ate with a line to line input voltage unbalance of up to 8 4 11 Turn On Control Circuit 4 12 The turn on control circuit is a long time constant network which achieves a slow turn on characteristic This feature protects load devices by minimizing turn on over shoot At turn on the control circuit provides an inhibit voltage to the firing circuits via the error amplifier keeping the SCR s off for approximately 20 seconds After 20 sec onds the inhibit voltage is removed and the circuit no long er exercises any control over the operation of the supply 4 13 Overvoltage Protection Feature 4 14 The overvoltage protection circuit prevents the output
126. upply output is held off for approximately 10 to 20 seconds after turn on by an internal control circuit c To check out constant current circuit first turn off supply Then short circuit output bus bars and rotate VOLT AGE controls fully clockwise Turn on supply d After turn on delay adjust CURRENT controls until desired output current is indicated on ammeter 6 e If supply is equipped with overvoltage crowbar Option 006 front panel will contain CROWBAR ADJUST pot and lamp Option 006 is not ordered this portion of panel is blank Refer to Appendix A for crowbar oper ating instructions f TEMPERATURE and OVERCURRENT PRO TECT lamps and are described in Paragraph 3 24 Before connecting actual load to supply read the following paragraphs 33 OPERATING MODES 3 4 power supply is designed so that its mode of oper ation can be selected by making strapping connections be tween particular terminals on the terminal strips at the rear of the power supply The terminal designations are plated on the P C board below their respective terminals The follow ing paragraphs describe the procedures for utilizing the vari ous operational capabilities of the power supply A more theoretical description concerning the operational features of this supply is contained in Application Note 90A Power Supply Handbook available at no charge from your local Hewlett Packard sales office Sales office addresses appear
127. use in analog computer and other applications where the load requires a positive and a negative power supply and is less susceptible to an output voltage change occurring simultaneously in both sup plies than to a change in either supply alone 3 7 3 53 Battery Charging 3 54 The automatic crossover between constant voltage and constant current displayed by the SCR 10 Series makes it an ideal supply for battery charging applications Using this feature a battery may be charged at a constant current until the maximum charge voltage is reached at which point the supply will revert to constant voltage and continue to supply a trickle charge current sufficient to maintain full charge see Figure 3 10 Thus the charging operation can be unattended after properly setting the charging rate and the maximum charge voltage and connecting the battery to the output terminals of the supply 3 55 The procedure for setting the charging rate and full charge voltage on SCR 10 Series power supplies is as fol lows Turn both the VOLTAGE and CURRENT controls fully counterclockwise CCW b Place a short circuit across the output terminals and rotate the VOLTAGE control fully clockwise CW Rotate the CURRENT control to the desired charging rate as read on the front panel ammeter d Rotate VOLTAGE control fully CCW and remove the short circuit Rotate the VOLTAGE control to the desired fuli charge voltage as read on either the front
128. voltmeter 9 Replace decade box with equal value resistance in R25 position h Remove precision resistor and reinstall jumper be tween AB and A6 5 84 Ammeter Calibration 5 85 To calibrate the ammeter proceed as follows a Connect test setup shown in Figure 5 7 b Turn VOLTAGE controls fully clockwise c Turn on supply and adjust CURRENT controls un ti differential voltmeter reads voltage corresponding to maximum rated output current d Adjust 1 141 until front panel ammeter indicates exactly maximum rated output current 5 86 Backup Overcurrent 5 87 Proceed as follows to adjust the backup overcurrent limit a Connect test setup of Figure 5 7 b Turn on supply and turn CURRENT controls fully ew c Voltmeter reading corresponds to 11096 of maxi mum rated output current d If it does not connect decade box in place of A1R37 and adjust to obtain 110 e Install resistor equal to decade box in R37 position 5 88 Transient Recovery Time 5 89 To adjust the transient response proceed as follows Connect test setup as shown in Figure 5 4 b Repeat Steps a through d as outlined in Para graph 5 26 c Adjust R48 so that the transient response wave form has a minimum of overshoot or oscillation and is with in the tolerances of Figure 5 5 5 90 Phase Protection 5 91 This adjustment establishes the low input line point at which the phase protection circuit becomes activated Proceed as foll
129. y clockwise c Turn on supply and adjust CURRENT controls un til front panel ammeter indicates maximum rated output current d Differential voltmeter should read voltage corres ponding to rated output current 5396 5 31 Load Regulation Definition The change AlguT in the static value of the de output current resulting from a change in load resistance from short circuit to a value which yields maximum rated output volt age POWER SUPPLY UNDER TEST RL LOAD RESISTOR DIFFERENTIAL VOLTMETER fp 34208 2 OHMS Rs RATING iN AMPS 0 008 1000 0 036 500A 0 120 300A 0 425 150A 1 100 100A 4400 50A 8 600 50A 40 000 15A Figure 5 7 Constant Current Test Setup 5 32 check the constant current load regulation ceed as follows a Connect test setup shown in Figure 5 7 b Turn VOLTAGE controls fully clockwise c Adjust CURRENT controls until front panel meter reads exactly maximum rated output current 500A 15A for Models 6466C and 6483C respectively d Read and record voltage indicated on differential voltmeter e Short circuit load resistor RL f Reading on differential voltmeter should not vary from reading recorded in Step d by more than the follow ing Model Variation uVdc 6464C 100 6466C 110 6469 100 6472 100 6475 100 6477 100 6479 70 6483 166 5 33 Line Regulation Definition The c

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