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HP 6269A User's Manual

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1. ee E E CREE TABLE 5 5 Cont d Trouble and Description js Voltage Limited a Check Check the voltage across series regulators for 3 8V 0 4V full load Check 04 023 VRI CR44 if less than required Check 810 voltage programming R23 constant current programming refer ence voltage 9 44 Q3 026 18 CR19 CR20 VR2 and 17 volt unregulated bias if series regulator voltage is high D DEM M ADM Check the voltage across series regu lators for 3 8V 0 4V full load Check drop across R26 which should be 0 5 volts at 50 0 amps The resistance of R26 should be 0 01 ohms 596 Check VR2 2 and Q2B and Q4 if series regulator voltage is high Check R10 voltage programming poten tiometer Q3 Q23 and 17 unregulated supply if the series regulator voltage is low T A a t e TT ar n e rr e eee i Measure stability of reference voltage 9 9 8V Change diode if this voltage is unstable Check programming resistor use supply in Remote Programming with a good quality stable 20 ppm programming resistor Replace R11 noting R12 should be a minimum of ten times larger is resis tance than Rll Check Q1B 1 CR2 ORS Ie ly Cannot reach maximum output voltage b C 9 Current Limited b 10 Stability Constant Voltage Da C d
2. 20V Q20 PNP Silicon 53251 odo 40 lt 1 1 ma VOP 5V PMAX 600 mw 25 C Ambient NPN Small Signal Differential 4 12 839 2N2640 2 B amplifier 2 2480 GE 70 lt NPE 12 8 GE ma 5 1 Teg 10 na 25 C Vepo 20V Veco E Viel iss 2 mv 7 eo o 25 9 Ose Ies NPN Si planar 2N3417 2N3714 GE 25 26 180 lt hpp lt 540 2 4JX16B5 333 4 5 2 2195 GE lua 20 2 9 2 2219 Mot Vep 50V 0 8 9 T0 11 NPN Power 36616 36616 RCA E lt hFE lt 2 N3055 RCA 16 4 4V ma 22 G Voto 2 75V Vasp a 200 ma Ven 90V 200 1 205 gt x FERE ed 5 6 TABLE 5 3 Cont d H LAB ouggested Component Characteristics Designation Replacement 95 55 18 17 2 3391 2 3391 250 hpp lt 500 01 2 ma SM8748 TI 4V RIS 93027 oi Diode 1N485B 1N485B 28 29 305315 Low Leakage 1N484A dy s Ds 36 37 38 39 40 45 46 47 48 CR3 4 10 12 41 Si Rectifier 11151 1 484 Sylv 42 43 44 49 2 Amps 1 485 Sylv CRJ 13 15 1 5 oi Rectifier IN 3253 1N3253 RCA 17 18 19 20 1N2611 i CR25 26 SCR 25 Amp rms C30D C30D GE 400 Volt PRV 2 3898 RCA 2N3899 RCA CR11 21 22 23 24 Si Rectifier 1N1183A 1N1183A AR 40 Amps INi183AR rev pol Westinghouse 50 Volt PRV 1N11
3. CR5 7 Rect si 200mA 180prv CRS NOT ASSIGNED CRY Rect si 500mA 200prv Rect 51 200 10 11 si 40A SOprv CR12 Rect si 200mA 10prv 13 20 Rect si 500mA 200prv CR21 Rect si 40A 100prv 822 23 Rect si 40A 50prv CR24 Rect si 40A 100 CR25 26 SCR 25A 400prv CR27 40 Rect 51 200mA 180prv 841 44 Rect si 200mA 10 CR45 48 Rect si 200mA 180prv CRAY Rect si 200mA 10 850 Rect si 20A 100 DSI Indicator Light Neon Line Choke SS NPN diff amp si oo NPN si 55 NPN si SS NPN 51 Power NPN si oo NPN si Om BS mM T 6269A 6 5 obd 192P2249R8 192P47292 192P2249R8 192P47292 192P10292 obd obd obd obd obd 1500105 9035 2 192P10492 obd 3002066050 36D103G050CD6A 160P47306 161P47406 160P47306 160 10494 161 47406 33 Curve 5 1N485B 11151 1N485B 1N3253 11181 1N1183A 11181 1N3253 1N1183AR 1N1183A 1N1183AR C30D 1N485B 11151 IN485B 11151 41 858 R 626993 4JX12A839 4JX16A1014 2 3417 43X11C710 36616 41 16 1014 09182 56289 26289 56289 30289 56289 09182 09182 09182 09182 09182 56289 56289 99182 96289 09182 56289 56289 56289 56289 96289 56289 74193 93332 93332 93332 02735 94442 02517 SERES 02 35 02577 02577 02577 03508 93332 93332 93332 922232 03508 08717 09182 03508 03508 03508 03508 0918
4. Internal Monitoring Resistor 2 The maximum load on the regerence voltage is approximately 10 microamperes 3 impedance looking into the external programming voltage should be approximately 1000 ohms Voltage Resistance Programming See Figure 3 6C 1 Stable low noise low temperature coefficient less than 30 ppm per degree Centigrade programming resistors should be used 2 RA should be selected so that the impedance looking into their junction is a maximum of 1000 ohms 3 The output current will vary linearly as a function of VREF Ra The equation for the output current is given by the following lo RA RM RR 3 13 _ REMOTE SENSING 3 14 Remote sensing is used to maintain good regulation at ds load and ameliorate the degradation of regulation which will occur due to the voltage drop inthe leads between the power supply and the load Remote sensing is accomplished as follows See Figure 3 3 a Bs Disconnect the jumper between S and and S Run a separate pair of leads from S to the negative load terminal and 5 to the positive load terminal CAUTION Polarity must be observed It is not required that these leads be as heavy as the load leads However it is recommended that they be twisted or shielded to minimize hum pickup 3 6 PROGRAMMING 8 Ri RESISTOR C FIG 3 GA REMOTE RESISTANCE PROGRAMMING CONSTANT CURRENT REFERENCE VOL
5. Fairchild Semiconductor Div of Fairchild Camera and Instrument Corp Mountain View Calif Birtcher Corp The Los Angeles Calif Sylvania Electric Products Inc Mountain View Operations of Sylvania Electronic Systems Mountain View Calif L Burlington Iowa Continental Device Corp Hawthorne Calif Raytheon Mfg Co Semiconductor Div Mountain View Calif Brooklyn N Y Sun Valley Calif Reliance Mica Corp Sloan Company Vemaline Products Co Franklin Lakes N J Nylomatic Corp Morrisville Pa Hewlett Packard Co Harrison Division Berkeley Heights N ij amp Components Newton Mass CTS of Berne Inc Berne Ind Chicago Telephone of California Inc So Pasadena Calif IRC Inc Boone N C General Instrument Corp Semiconductor Prod Group Rectifier Div Newark Philadelphia Handle Co Inc Camden N J Lake Mills Wisconsin Dover Hamlin Inc Clarostat Mfg Co Hewlett Packard Co Loveland Division Loveland Colo Cornell Dubilier Elec Corp Newark N J General Instrument Corp Semiconductor Prod Group Semiconductor Div Hicksville N Y Daven Div of Thos Edison Industries Mc Graw Edison Co Livingston N F Corning Glass Works Electronic Components Div Raleigh N C Delco Radio Div of General Motors Corp Kokomo Ind Atlantic Semiconductors inc Asbury Park N J CODE NO Muter Belden Mfg Co CTS Corporation
6. SCR CONTROL Mo VOLTAGE 72 CIRCUIT CPP P TASA V 33A INPUT CIRCUIT scenes 9 2898 law ae f SE mee E 1 2 PEN CU com s 1547 ASA 2 25 1 526 2 2 fJ K 4 y CHAS COR 62 UT VPE gt gt E 5 sem er AEF 22709 23 j 400 224 M lt CRAP NOTES Gb a Ai RESISTORS ARE 5296 UNLESS OTHER WISE 23 OVER war 2 DENOTES 20 POM WIRE TEMP COEF FOOTED TION dea TERMINALS ARE SHOWN NORMAL STRAPPING FOR USE OF FRONT PANEL CONTROLS DASHED TRANSISTOR amp RESISTOR IWOI CATE 7 SIMILAR ges COMBINATIONS IN PARALLEL ACROSS 996 049 n DENOTES NOMINAL VALUE COMPONENTS SELECTED CIRCUIT PATENTS APPLIED FOR LICENSE TO USE MUST BE FOP Model 6269A Schematic Diagran OBTAINED IN WRITING FROM HARRISOM
7. 6269A 6 9 4LHB182B 09182 05820 09182 89032 89032 89032 89032 79307 79307 09182 96283 09182 NF207 obd 8032 832 4 2684 1024 4 C8091 632 4 117373 012 248 T4 4 6 15 4586 22 09182 09182 09182 obd obd obd 55 168 720 21 1205 0933 0340 0166 0590 0748 0590 0711 0510 0275 0510 0123 1400 0330 1400 0002 1400 0321 0180 1970 2190 0491 0380 0710 9211 0857 9220 1228 Model 69178 1490 0872 2100 1866 0370 0137 1140 0020 2100 1863 0370 0137 1140 0020 rM cocco 4973 Bed E memo ne URRE NT INPUT CIRCUIT 74 4025 024 e d 7 SHUNT 27 EN 7 JW 1 222312 CURRENT CON POL DRIVER amp ERROR AMPLIFIER Be ee ie DN ae pees ey METER CIRCUIT n wor Tra 4 Qe FISK 5 12250 AMS P aprusT Ke OL 620 _ aoust 2 03 MIXTE E n 7 T nam E aoe 1 Re 252 RB 22 5 gor CG 00 Es E OLIA ji Rif a eee _ sg 22 1 ae 5 1 a 0 A VOLTAGE 24 CONTROL ee
8. GE germanium ground ed henries mercury impg impregnated ins insulation ed K kilo 1000 lin linear taper log logarithmic taper milli 1073 M megohms ma milliamperes micro 1076 mfr manufacturer mtg mounting my mylar NC normally closed Ne neon normally open obd p pc pt pp ppm pos poly pot prv rect rot rms sect Si sil si td TiO2 tog tol trim twt var w W w o Description Abbreviations Reference Designators Continued thermistor Switch transformer vacuum tube neon bulb photocell etc socket fuseholder Lampholder network order by descrip tion peak printed circuit board picofarads 10712 farads peak to peak parts per million position s polystyrene potentiometer peak reverse voltage rectifier rotary root mean square slow blow section s silicon silver slide z time delay titanium dioxide toggle tolerance trimmer traveling wave tube variable with watts without cabinet mount only Table 6 3 MANUFACTURER ADDRESS EBY Sales New York N Y Aerovox Corp New Bedford Mass Sangamo Electric Company Ordill Division Capacitors Allen Bradley Co Litton Industries inc Marion fll TRW Semiconductors Inc Lawndale Calif Texas Instruments Inc Semiconductor Components Division RCL Elect
9. Table 6 3 MANUFACTURER ADDRESS Fairchild Mountainview Calif The Bendix Corp Eclipse Pioneer Div Teterboro Electra Mfg Co Independence Kan Pansteel Metallurgical Corp No Chicago Ill Union Carbide Corp Linde Div Kemet Dept Mountain View Calif ITT Semiconductors A Division of International Telephone amp Telegraph Corp Palo Alto Catif General Electric Co Schenectady N Y General Electric Co Lamp Division Nela Park Cleveland Ohio General Radio Co West Concord Mass Dynacool Mfg Co Inc Saugerties National Semiconductor Corp Santa Clara Calif Palo Alto Calif Kenilworth N J Owensboro Ky Hewlett Packard Co Heyman Mfg Co G E Tube Dept Lectrohm Inc Mallory amp Co Inc Indianapolis 114 Chicago Ill Ohmite Manufacturing Co Penn Engr Doylestown Pa Polaroid Corp Cambridge Mass Raytheon Mfg Co Microwave and Power Tube Div Waltham Mass oimpson Electric Co Chicago Sprague Electric North Adams Mass superior Electric Co Bristol Conn Union Carbide Corp New York N Y Ward Leonard Electric Co Mt Vernon N Y Union City Chicago Willoughby Ohio Amperite Co Inc Bud Radio Inc Bussmann Mfg Div of Mc Graw Edison Co ot Louis Mo Eikhart Ind I T T Cannon Electric Inc Chicago Ill Skokie Los Angeles Calif Centralab Div of Globe Union Inc Milwa
10. Board Buss Bar Cover Barrier Strip Capacitor Clamp Heat Sink Board Buss Bar Output Handle 7 Heat Sink SCR Heat Sink Rect Heat Sink Trans P C Board Assembly Includes Components Printed Circuit Board Blank C Board Assembly Includes Components Printed Circuit Board Blank Barrier Strip Modify Barrier Strip Board Knob 5 8 dia Knob 5 8 dia Spacer Insulated heat sink 5 Way binding post maroon 5 Way binding post black Jumpers Jumpers Spring Meter Voltmeter mod 1 884 41595 0 50V Ammeter 5 mod lmA 88a t15 0 60A Bezel Meter i mod Rubber bumper Black Durom Hd 55 60 Insulator heat sink mtg Shoulder washer Wafer mounting SCR Motor fan Casting mach obd obd obd obd F2 BS d 10 PF NS oR BO BS BO BS BM obd obd de obd obd 602 3 obd obd obd obd DF21RC 218 601 7 603 obd On 4 ANN RR obd pum obd obd 2066 4021 obd 6269A 6 8 100174 4 REF DESCRIPTION MFR PART NO Psi 5060 6101 9000 6001 5000 6002 5000 6003 5000 6004 5000 6005 5000 6006 06269 60001 5000 6007 5000 6019 5000 6009 96269 60002 5000 6011 5000 6012 5000 6013 5000
11. NOTE 1 EITHER THE POSITIVE OR NEGATIVE OUTPUT TERMINAL SHOULD BE GROUNDED uJ 9 V M SLAVE 1 WN gt lt l o 3 10 3 UNITS FIG 3 7B AUTO SERIES a lt 4 Rio gt lt 59 OR NEGATIVE OUTPUT TERMINAL SHOULD BE NOTE LE ITHER THE POSITIVE GROUNDE D Ris 8 AUTO TRACKING FIG 2 b Resistors and are selected so that the current through the resistors is approximately equal to the programming current at maximum output voltage c Either the positive or negative output terminal of the slave units may be connected to the common bus 222 PARALLEL OPERATION 3 23 operation is used when is desirable to have a larger current than is available from a single supply 3 24 Power supplies are connected in Auto Parallel in accordance with Figure 3 9 Ry and Ry are stable low noise and low temperature coefficient less than 30 ppm per C and selected such that the individual slave output currents equal 410 the master output current approximately 10 of the maximum value of the current program ming network Rx sets maximum current limit to compensate for voltage drop in output voltage lead 3 25 INCREASING SENSITIVITY OF THE POWER SUPPLY IN CONSTANT CURRENT OPERATION MM UU LN MMAIDIBANIUUANDNI OPERATION 27 25 The operation of the powe
12. 1 Excessive Output Ripple a to see if output is grounded Use Iw capacitor if it is impossible to DC ground b Check voltage across series transis tors Use a scope DC coupled to make the measurement which should be 3 8V 0 4 full load Check 22 volt ripple Should be maximum of 2 mv peak to peak d Check current control to be certain power supply is not operating in constant current mode m i a T a a a aa EH m RM 2 Poor Line Regulation Constant Voltage Check 15 4 volt line regulation 3 Poor Line Regulation Constant Current Check adjustment of R34 4 Poor Load Regulation a Measurement Technique should Constant Voltage measure across the sensing ter minals b Incorrect strapping of sensing terminals QIA or defective d Current control set too close to maximum operating current T M M M MM M UUU E Poor Load Regulation External load across output termi Constant Current nals i e low impedance voltmeter 93 04 2 2 or VR2 defec tive Voltage control set too close to maximum Operating voltage 6 Oscillates Constant Voltage Check adjustment of 7 equalizer capacitor C2 and strap between A6 minus Check adjustment of R36 and UA TUTTI a i T t a a ee n 725 Oscillates Constant Current Check adjustment of R36 and C5 and C3 6269A 5 9 rm DM RE DEED
13. 11 Stability a Constant Current 6209A acr Measure stability of reference voltage 6 2 volts measured between 5 and change VR2 if unstable Check Trouble tion b Operate power supply in constant current remote programming mode using a good quality stable 20 pom and TC Resistor as programming resistor to check R26 as source of drift Check R16 R24 and R25 Change Q2A and Q2B if above steps 40 not yield positive results li Stability Con d Constant Current 6269 Oll 5 22 Table 5 4 lists other voltages to measure the tolerances of these voltages and typical peak to peak ripple 5 23 Generally malfunction of the supply is indicated by the absence of or excessive output voltage Table 5 5 is a list of malfunctions and circuit areas to check 5 24 POWER SUPPLY ADJUSTMENTS 5 25 The following adjustments procedure is that which is followed in the factory and is normally not required when a unit is repaired 5 26 The front panel voltage control and current control pots should be turned to mid position Use an ohmmeter to make certain the negative output terminal and the col lectors of Q9 through Q16 the anodes of CR21 CR22 CR23 and CR24 and cathodes of CR25 and CR26 are not grounded 5 27 The line breaker is turned on The output voltage should be approximately 20 volts Vary the output voltage with the voltage control pot to be certain that the voltage con trolis oper
14. 6014 06269 00001 5020 5513 5000 6017 5000 6018 5000 6144 5020 5584 5020 5501 5020 5502 5020 5503 06269 60020 5020 5504 06269 60021 5020 5702 0360 1213 0360 1237 0370 0084 0370 0137 0380 0711 1510 0040 1510 0039 1460 0256 1120 1173 1120 1181 4040 0296 0403 0085 0340 0172 0340 0175 3140 0010 5243 20 No pe 1 Ja 1 2 40 06 ae ee ee ee ee ae ide DESCRIPTION T MFR PART NO end 4 RS DESIG V CODE PART NO Blade fan Heat Dissipator Q6 Insulator Transistor Pins Fastener Rear chassis Fastener Input capacitor Fastener Fastener Pilot Light Cable Clamp Nylon Plastic Cable Clamp 26 029 1 I D Capacitor Clamp Capacitor Clamp 2 9 16 3 holes Shoulder Washer 8 Output Buss Spacer Insulated 8 x 5 16 LG Output Buss Carton Pad Floater S m oL BO oe N B OPTION 06 Overvoltage Protection crowbar Overvoltage Protection crowbar OPTION 10 Chassis Slides Slides OPTION 13 3 Digit Decadial Voltage Control var ww 10K 45 10 Turn Knob 810 Black 3 Digit Decadial OPTION 14 3 Digit Decadial Current Control var ww 200 559 10 Turn Knob R23 Black 3 Digit Decadial NT
15. Pa Components Div Leecraft Mfg Co Inc Huntington Ind Long island City N Y Methode Mfg Co Chicago Ili Dage Elect Franklin Ind Amphenol Controls Div of Amphenol Borg Electronics Corp Janesville Wis Sealectro Corp Mamaroneck N Y International Electronic Research Corp Burbank Calif Renbrandt inc Boston Mass THE FOLLOWING H P VENDORS HAVE NO NUMBERS ASSIGNED IN THE LATEST SUPPLEMENT TO THE FEDERAL SUPPLY CODE FOR MANUFACTURERS HAN DBOOK Cooltron Oakland Calif 00000 Plastic Ware Co Brooklyn N Y Table 6 4 Replaceable Parts DESCRIPTION T MFR PART ee DESIG cope R8 fxd fxd fxd fxd fxd fxd fxd fxd fxd TRE fxd fxd fxd fxd fxd fxd fxd fxd fxd elect Suf 65Vdc 5 film 22pf 80Vdc film 004703 200Vdc film 22823 80Vdc film 0047uf 200 4 film 00161 200Vdc elect Suf 65Vde elect 325pf 35Vdc elect 1400uf 30Vdc elect 40 000uf 50Vdc elect 5uf 65Vdc elect luf 35Vdc film 200Vdc elect Suf 65Vdc elect 20nf 50Vdc ASSIGNED elect 4 50Vdc elect 10 000uf 50Vdc paper 047 600Vdc paper 47uf 600Vdc paper 04 7 600Vdc paper iuf 400Vdc paper 47uf 600Vdc Circuit breaker 25A 250Vac Max CR1 2 Rect si 200mA 180prv 4 Rect si 200mA 10
16. Revision Sheets will be supplied with this manual which will specify changes required to make the manual apply to units having a Manufacturing Code Letter other than that appearing on the Title Page 1 0 COOLING SYSTEM L9 This power supply uses forced air cooling and requires no maintenance ex cept for an occasional dusting There should be sufficient space to the rear and along the sides of the instrument to permit free flow of cooling air SECTION 2814 INCOMING INSPECTION 262 The instrument should be unpacked and inspected both mechanically and electrically upon receipt Observe packing method and retain packing materials until unit has been inspected Mechanical inspection involves checking for signs of physical damage such as scratched panel surfaces broken knobs etc If damage is apparent file a claim with the carrier The electrical inspection involves checking the instrument against its specifications Section V includes a performance check which ig an in cabinet check to verify proper instrument operation see paragraph 5 55 It is recommended as an incoming inspection test Refer to the warranty page if there is an electrical malfunction 2253 INSTALLATION 2 4 The LVR series are shipped ready for relay rack mounting It is necessary to connect the power cable to the POWER input barrier strip and the instrument is ready for operation 2 5 This instrument uses force air cooling Sufficient space to permit the flow of coo
17. SERIES REGULATOR AND ERROR AMPLIFIER Figure 4 5 4 16 The series regulator consists of transistors Q9 through 016 Transistor Q7 and Q8 in a Darlington connection is the drive for the series transistors and Q5 a common emitter is the predriver SERIES LOUT REGULATOR iw PON R28 R7 4 CONSTANT VOLTAGE rar INPUT CONSTANT CURRENT INPUT C3 Re R33 FIG 4 6 GATING AMPLIFIER 4 17 05 is the error amplifier transistor and signals applied to the base are amplified and applied to the base of Q6 C5 and R36 stabilize the feedback loop and CR11 is a protective diode 4 18 AMPLIFIER GATE Figure 4 6 4 19 Q3 Q4 CR5 CR6 and associated components form a gated amplifier In steady state one transistor is saturated collector near zero potential and the other transistor is amplifying and passing signal current to the error amplifier The cathodes of CRO6 and CR5 are always at a greater positive potential than the saturation potential of Q3 or Q4 If we assume the system is in constant voltage operation Q3 is operating in a linear mode while Q4 is saturated Saturation of Q4 effectively reverse biases CR6 and only signal current through CR5 activates the error amplifier C65 across CR5 is com mutating capacitor which improves transient response R29 C4 R7 and CZ are low frequency loop equalizers in constant current and constant voltage respectively C3 and R30 form a high frequency lead network in constant
18. change in voltage across the current monitoring resistor should not exceed 200 10 ma 2 48 Load Regulation A differential voltmeter is connected across the current moni toring resistor The power supply is operated at 39 volts out and 50 amperes load and 208 230V line The voltmeter reading is noted The load is shorted The change in voltage across the current monitoring resistor should not exceed 200 10 ma NOTE The supply will go momentarily into short circuit protection 5 49 PERFORMANCE TEST 2 91 These tests are in cabinet specification checks and are made before disturbing any of the internal power supply adjustments The tests may be used as an incoming inspection test periodic maintenance or to check the instrument after repairs Refer to Section 3 38 before making measurements 5 52 CONSTANT VOLTAGE 2 53 Voltmeter Check An external voltmeter having an accuracy of 1 or better is connected across the output terminals and is used to check the front panel voltmeter at 40 volts out 9 54 Ripple Check The power Supply is operated at 40 volts out and full load and at an input line voltage equal to low line An oscilloscope is connected across the sen Sing terminals Maximum peak to peak 120 cycle ripple should not exceed 1 mv exclude high frequency noise NOTE One output terminal of the power supply must be grounded 5 55 Line Regulation The power supply is operated at 40 volts and 50 amperes load A dif
19. current SERIES REG OUT 5 9 4V RI2 Ri I i gt POTENS OUT FIG 4 7 INPUT CIRCUIT CONSTANT VOLTAGE 4 20 CONSTANT VOLTAGE INPUT Fi ure 4 7 4 21 differential amplifier 1 and associated circuitry are employed as detector amplifier in the constant voltage mode and R12 a shunt re sistor are used to establish the programming current level R9 and R10 are the voltage adjust ment potentiometers and are shunted by C1 a low impedance AC signal path The base of QIB is grounded through resistor R6 in order to achieve desired thermal charac teristics The base of is connected to the junction of the programming Diode CRI and CR2 limit voltage excursions on the base of limits the current through the programming resistor under conditions of rapid voltage turndown CR3 R4 and R3 comprise a bias network to establish collector voltage for Q18 4 22 INPUT CIRCUIT CONSTANT CURRENT Figure 4 8 R20 8192 1153 MEE i Ot 5 SERIES i R26 FIG 4 8 INPUT CONSTANT CURRENT COARSE R235 CURRENT cine ADJUST R22 J A4 4 23 The constant current input circuit consists of the fine current control R22 and the coarse current control R23 the amplifier transistors Q2A and Q2B and associated circuit The base of Q2B is grounded through the impedance equalizing resistor R20 in order to achie
20. load is then taken across the two unconnected output terminals 3 19 Ihe power supplies should be connected in the Auto Series configuration if it is desirable to have the voltage of two or more power supplies connected in series track each other or vary proportionally See Figures 3 7 and 3 7 for wiring dia grams See note Stable low noise low temperature coefficient less than 30 ppm per degree Centigrade resistors should be used for Ry D and Ry should be selected so that a current equal to the pro gramming current flows at maximum output voltage The voltage across Ry will be equal to the output voltage of the master unit The voltage across Ry will equal the output voltage of slave unit The most positive supply must be selected as the master con trol unit 3 20 AUTO TRACKING OPERATION 3 21 is useful when it is desirable to have several power supplies referenced to common bus vary proportionally The connections are made in accordance with Figure 3 8 a The most positive power supply must be selected as the master Or control unit APPI See AS ee taan Sates MASTER QS SLAVE O 1 n AL AS AT AB NOTE FOR EXTERNAL PROGRAMMING OF SLAVE SUPPLY ADD Ry REMOVE STRAP FROM Al TO 2 ON SLAWE UNIT 2 UNITS FIG 3 7A AUTO SERIES
21. per volt i e The output voltage will vary 1 volt for each 200 ohms connected across the programming terminals The programming current is adjusted to within 2 of 5 milliamperes at the factory for the models having a maximum rated output less than 60V and 3 33 milliamperes for models with a capability equal to or greater than 60V If greater programming accuracy is required it may be achieved by changing the shunt resistor SEE NOTE Voltage Programming See Figure 3 5B The output voltage will vary in a one to one ratio with the ex ternal programming voltage The maximum load on the programming voltage will be approxi mately 25 microamperes The impedance looking into the external programming voltage should be approximately 1000 ohms Voltage Resistance Programming See Figure 3 5C Stable low noise low temperature coefficient less than 30 ppm per degree Centigrade programming resistors should be used Rr and Rp should be selected so that the impedance looking into their junction is a maximum of 1000 ohms The power supply may be programmed by varying the reference voltage by varying resistor Ry or by varying resistor Rp The output voltage will vary linearly as the regerence voltage is changed The output voltage will vary as the ratio of Rp to Ry when Rp is varied The output voltage will vary in accordance with the following equation when R is varied Rp VO VREFX 3 33 milliamperes corresponds to 300 ohms per
22. than 2 ohms from 1 Kc to 100 Kc Less than 2 ohms from 100 Kc to 1 Mc Transient Recovery Time Less than 150 microseconds is required for output voltage recovery in constant voltage operation to within 20 millivolts of the monimal output voltage following a half load change in output current For this measure ment the monimal output voltage is defined as the mean between the no load and full load voltages Overload Protection An all electronic continuously acting constant current circuit protects the power supply for all overloads including a direct short placed across the output terminals A front panel control permits continuous adjust ment of the constant current value from 0 amps to 50 amps Controls A single control makes possible continuous adjustment of the output voltage over the entire range from 0 to 40 volts A vernier control is also provided The current control permits adjustment of the output current to the optimum value for protection of the load device and serves as the output current con trol when the supply is used as a constant current source A vernier Current control is also provided Meters 50V voltmeter and 0 60 ammeter are provided Output Terminals The output terminal strip 15 located on the rear of the chassis All power supply output terminals are isolated from the chassis and either the positive or negative terminal must be connected to the chassis through a separate ground terminal located adjac
23. 100 1824 0686 1825 0686 9115 0686 4735 0686 1015 0686 1205 0812 0018 0686 8205 0686 2215 0686 1025 0811 1799 0698 5149 0698 3283 R2 je REF MFR DESIG DESCRIPTION MFR PART CODE PART NO R61 fxd film 5604 1 4W 1 obd 0698 5146 1 R62 fxd film 2Ka 419 W 1 obd 0757 0739 1 R63 film 1 33 1 W 2 obd 0698 3134 1 R64 fxd comp 100Kn 4595 4W 1 obd 0686 1045 1 R65 fxd film 1 33 1 FW obd 0698 3134 R66 fxd ww 254 45 SW 1 Type 5XM 0811 1853 1 R67 fxd ww 3004 45 10W 1 10 0818 0054 1 R68 fxd film 2204 5 2W 1 C425 obd 0698 3628 1 R69 fxd comp 244 5 iW i 0586 2405 1 R70 fxd ww 1 5 5 1 Z42E1525 0811 1805 1 R71 fxd comp 3 9Ka 5 4W 1 obd 0686 3925 1 R72 fxd comp 9 5 1 obd 0686 9125 1 R73 fxd comp 110Ka 5 iW 1 obd 0686 1145 1 R74 fxd comp 12Ka 5 1 obd 0686 1235 1 R75 var ww 5Ka Modify 110 F4 obd 2100 1824 R76 fxd comp 470Ka 5 4W 1 obd 0686 4745 1 R77 fxd comp 4 7 5 1 0689 0475 1 R78 79 fxd comp 5 1Ka 5 W 2 obd 0686 5125 1 R80 fxd comp 240K4 5 1 obd 0686 2445 1 R81 fxd comp 4 5 4W 2 obd 0686 4325 1 R82 83 fxd comp 224 5 iW 2 obd 0686 2205 1 R84 fxd comp 4 3Ka 5 obd 0686 4325 R85 fxd comp 82Ka 5 2W 1 ob
24. 2 03508 0180 1836 0160 2453 0160 0157 0160 2453 0160 0157 0160 0153 0180 1836 0180 0332 0180 1860 0180 1931 0180 1836 0180 0291 0160 0168 9180 1836 0180 0049 0180 1849 0160 2464 0160 0013 0160 2464 2110 0213 1901 0033 1901 0461 1901 0033 1901 0389 1901 0461 1901 0315 1901 0461 1901 0389 1901 0316 1901 0315 1901 0316 1901 0033 1901 0461 1901 0033 1901 0461 1901 0324 1450 0048 1854 0229 1854 0371 1854 0087 1854 0228 1854 0371 REP DESCRIPTION T MFR PART NO MFR DESIG Q cope 88 1853 0001 SS PNP 51 1 53251 55 NPN si 2N3417 55 PNP 51 2N2907A SS NPN si 2N3417 fxd ww 470 45 1 24254715 fxd film 33Ka 1 1 8W 2 obd fxd film 160 1 1 8W 2 fxd film 61 9 51 1 8W 2 obd fxd film 432 1 1 8W 2 obd fxd film 1 5 1 1 8W 1 var ww lKa Modify 1 110 4 fxd film 47 5 195 1 8W 3 obd var comp 50 2W 1 JAINO40PS500UA var ww 10 5 1 100224 5 fxd ww 2 5 1 24222025 fxd comp Selected 5 4W 3 obd fxd film 432Ka 1 1 8W obd R14 31 105 NOT ASSIGNED R15 fxd film 1004 1 1 8W obd R16 fxd film 33K
25. 5 is amplified and applied to the ba e of the driver Q6 which applies the amplified and inverted signal in phase to the bases of Q7 and 08 This signal is amplified and applied to the base of the series transistors Q9 through 16 The signal is applied in the phase and amplitude required to restore the original operation conditions this maintaining the output voltage output current of the power supply constant 4 33 The DC output voltage is changed by varying the front panel controls Resistor R10 in conjunction with the reference voltage can be considered a constant current source since the voltage at the summing point A3 is at circuit ground when the loop is in equilibrium Potentiometer R9 and R10 are connected between the summing point and the negative sensing terminal and since the current through it is constant feed back action of the regulator loop will maintain the output voltage of the power supply equal to the drop across this resistor 4 34 The DC output current is changed by varying the front panel controls The opera tion of the constant current circuit is similar to the constant voltage mechanism the input t the constant current circuit is the algebraic sum of the voltage across R22 R23 R26 R22 and R23 set the constant current level and R26 monitors the output level Any changes are detected amplified and applied in proper phase to restore the original Operating conditions SECTION V MAINTENANCE 5 1 COVER REM
26. 8 Line Regulation The power supply is operated at 40 volts out and full load A differential voltmeter is connected between S and 5 The input line voltage is varied from 310 around nomial The output voltage should not vary more than 2 mv as the input voltage is varied The line regulation of diode VRI should be checked in the event the output voltage varies more than 2 mv 5 39 Output Ripple The power supply is operated at 40 volts out full load and low line An oscilloscope is connected between 5 and S One of the output terminals of the power supply must be grounded The maximum 120 cycle peak to peak ripple as indi cated on the oscilloscope should not exceed 1 mv exclude high frequency noise 5 40 Low Voltage Ripple The power supply is operated at 4 volts out full load and high line An oscilloscope is connected between 5 and S One of the output terminals of the power supply must be grounded The maximum 120 cycle peak to peak ripple should not exceed 1 mv exclude high frequency noise 5 41 Transient Response The power supply output voltage is set at 40 volts A switch is used to vary the power supply load from no load to 25 0 amperes An oscilloscope is connected between 8 and S R7 and R36 are adjusted so that the decay of the transient spike is a smooth exponential curve without undershoot overshoot or ringing for both the loading and unloading transients The voltage should recover to within 20 mv of the nominal output v
27. 84A AR Westinghouse eA a eg e rd VR2 6 2V 400 mw zener 1 821 IN821 1N821 Mot __ _ UNITE a a ti a ii aei e i T P i mr t i mra a a A M Ta ir ri a ft A a E ET 9 4 Temperature IN2163 1 2163 Compensated oemcor Reference Diode 1N2621 NOTE These components are mounted using a mica washer and silicon grease When replacing transistors or diodes be sure to replace the insulating washer and the silicon grease so that these components will have good heat conduction to the chassis 6269 ger TABLE 5 4 POWER SUPPLY VOLTAGES Measured From to 5 21 9 4V x0 4V 200 5 40 20 04 Ok 1 0V 5 65 i0 2V 2 mv 5 AG 17 0 2 07 5 19 1 0V 0 4V 2 mv 5 29 6 0 0 4V 100 mv 5 34 15 4 0 57 500 30 5 t0 3V 1 mv 5 25 1 8V 0 2 2 mv 45 5 2 4V 0 4V 20 mv 30 32 22V 220 2 mv 30 40 32V 2 09 0 5 29 46 0 X 0 5V 100 mv t BO lt 500p v NOTE The voltages listed above are at 40 volts no load and 208 230 volts line These voltages will vary with line and load The DC voltages were measured with a one hundred thousand ohms per volt voltmeter Simpson Model 269 The ripple voltages were measured with an Model 130C oscilloscope using the differential mode of operation and grounded at the positive output terminal of the power supply 62694 5 8 TABLE 5 5 MISCELLANEOUS TROUBLES Trouble and Description _ Check ____ u DE
28. OPERATING AND SERVICE MANUAL OPERATING AND SERVICE MANUAL MODEL 6269A DC POWER SUPPLY MANUFACTURING CODE 6A HEWLETT PACKARD SPECIFICATIONS Input 167 230 207 253 VAC single phase 50 60 line current 21 18 amperes Output 0 40 volts 0 50 amperes Load Regulation Constant Voltage Less than 0 01 olus 200pv for a full load change Constant Current Less than 0 02 plus 3 ma for a full load change Line Regulation Constant Voltage Less than 0 01 plus 200uv for a change in line voltage from 187 to 230 volts or 207 to 253 volts Constant Current Less than 02 olus 3 ma for a change in line voltage from 187 to 230 volts or 207 to 253 volts Ripple and Noise Constant Voltage Less than 1 mv rms Constant Current Less than 30 ma rms Maximum Operating Temperature ul he s Temperature Coefficient Output vo itage change per degree Centigrade is less than 01 plus 200pv Output current change per degree Centigrade is less than 01 plus 4 ma Stability As a constant voltage source the total drift for 8 hours after a one hour warm up at constant ambient is less than 0 03 plus 2 mv As con stant current source the total drift for 8 hours after a one hour warm up at a constant ambient is less than 03 plus 10 ma Internal Impedance as a Constant Voltage Source Less than 001 ohms from DC to 100 cycles Less than 01 ohms from 100 cycles to 1 Kc Less
29. OVAL AND REPLACEMENT 2 cover is divided into top and bottom Removal of the top cover provides access to a printed circuit board 5 3 TOP COVER REMOVAL a Remove the six retaining screws b Lift cover from the instrument 5 4 TOP COVER REPLACEMENT 5 5 the top cover by positioning the cover flat over the six retaining screw holes Replace the cover retaining screws 5 6 BOTTOM COVER REMOVAL a Remove the six retaining screws b Lift cover from the instrument 5 7 BOTTOM COVER REPLACEMENT a Replace the cover by positioning the cover flat over the six retaining screw holes b Replace the cover retaining screws 5 8 TEST EQUIPMENT REQUIRED 5 9 The test equipment for adjustment of the instrument is listed in Table 5 1 The table includes the type of equipment required critical specifications where the equip ment is used and recommended available commercial test equipment 5 10 TROUBLE SHOOTING 5 11 The purpose of the trouble shooting procedure is to enable maintenance personnel to isolate troubles to a specific area not necessarily a component A systematic approach such as is given later in this section can speed up repair and minimize down time 5 12 TROUBLE ANALYSIS 5 13 Before attempting to trouble shoot this instrument make sure the fault is with the instrument and not with the associated dircuit The performance test will enable one to determine this without having to remove the i
30. R27 CR29 OE 1 R Q23 id 42 CR43 e a 24 CR44 FIG 4 5 PREREGULATOR A 5 PREREGULATOR CIRCUIT Figure 4 3 4 6 minimizing the losses in the control element the preregulator maintains high efficiency for all output conditions The operation of the preregulator circuit is outlined in the following paragraphs 4 7 The collector of Q24 serves the summing point for all signal inputs to the pre regulator control circuit The composite waveform and the individual components of the summing point waveform are shown in Figure 4 4 The presentation will be simpli fied by examining each signal component separately followed by the algebraic summa tion of the signal components composite waveform Figure 4 4 will be used for all waveform references 4 8 E isan offset voltage derived by charging the ramp capacitor C17 with a con stant current supplied through R74 and R75 This current is necessary to sustain a net negative charging current into the ramp capacitor maintaining maximum output current at low output voltages ition u mems me in Uf entre trl ihe rri AM YIEE VIN S 73 eri gt Es 6 TIME 7 2 Et I Ec amp Eb DECREASING FIRING POTENTIAL 52 lt RESET POINT 5 SIGNAL COMPONENTS COMPOSITE WAVEFORM FIG 4 4 4 9 is derived
31. SECTION OPERATION 251 OPERATING CONTROLS Controls and indicators and their functions are shown in Figure 3 1 3 3 PRELIMINARY CONSIDERATIONS 3 4 Check strapping pattern on rear terminals of the unit See Figure 3 2 The power supply as shipped from the factory is strapped for local programming local sensing as indicated on the rear of the unit It will be necessary to change the strapping pattern if the power supply is used in some other mode Wiring instructions for other operating configurations are outlined later in this section d CONNECTIONS TO LOAD The load is connected to the rear output terminals of the power supply The leads should be twisted or shielded if they are run past a source of interference 3 7 Sensing is automatically accomplished at the rear terminals of the power sup ply as shipped from the factory The user should realize that the specifications describing the electrical characteristics of the power supply are written for measure ments made on the sensing terminals of the power supply The user should be cognizant of the voltage drop which will occur in the load leads For example if two amperes flows through 16 stranded wire the drop in the leads will be approximately 8 mv per foot This drop can be minimized by using a larger size wire and minimizing the lead length to the load Regulation at the load can be maintained withing the specifi cations of the power supply by using remote sensing as
32. TAGE 4 21 S y b 1 4 5 1 i 1 2 VE LI 3 ir it DE v 4 2 4 22 4 12 4 24 2 ry 2 S 22 1 4 4 1 E 24 2 4 4 4 2 13 2 13 1 4 1 4 3 2 2 2 i z 1 ut i Mc 5 b 5 T 3 T En 3 H 31 31 E st E 7 eS FIG 3 6C VOLTAGE amp RESISTANCE PROGRAMMING REMOTE PROGRAMMING CONSTANT CURRENT Bow 3 15 above precautions will result in a low DC output impedance at the load However if a low AC impedance is required it is recommended that the following precautions be taken a Remove the strap between and b Reconnect the output capacitor or an equivalent Capacitor across the load using a separate pair of leads and being careful to mini mize the length of these leads 3 16 A combination of remote programming and remote sensing may be used The wiring for this combination is shown in Figure 3 4 3 17 CONSTANT VOLTAGE SERIES OPERATION 3 18 Two or more supplies may be operated in series to obtain a higher voltage the 6260A Series may be operated as much as 400 volts above ground than that obtainable from a single supply Power supplies are operated in series by connecting the positive terminal of one of the power supplies to the negative terminal of the second suppiy The
33. a 1 1 8W obd R17 fxd film 61 9Ka 1 1 8W obd R18 fxd film 160K 1 1 8W obd RI9 fxd film 43K4 1 1 8W obd R20 fxd film 1004 1 1 8W obd R21 fxd film 47 5K 1 1 8W obd R22 var Ww 104 5 100213 11 var ww 2004 45 100224 8 fxd ww 2 4Ka 5 242 2425 fxd comp Selected 5 W obd fxd ww 01 20ppm 626990 fxd comp 1004 45 4W obd fxd comp 15Ka 5 iW obd fxd comp 754 5 obd fxd comp 1004 5 W obd fxd comp 15 5 2 obd fxd comp 430 5 EW obd fxd comp 56Ka 5 4W obd fxd comp 1 5 obd var ww 5Ka Modify 110 F4 obd fxd comp 1 8Ka 5 4W obd fxd comp 910 45 iw obd fxd comp 47Ka 5 5 obd fxd comp 1004 5 W obd fxd comp 124 5 W obd fxd ww 1004 5 SW fxd ww 054 5 10W 5 HMAL 11 21837 fxd comp 824 5 obd fxd comp 2204 5 4W obd fxd comp lKa 5 W obd fxd ww 3904 5 24283915 fxd film 6 2 1 iW fxd comp Selected 45 iw obd fxd film 9 31Ka 1 iW obd 6269A 56 6 1854 0087 1853 0099 1854 0087 0811 1555 0698 5089 0698 5092 0757 0460 0757 0480 0757 0427 2100 0391 0757 0457 2100 1873 2100 1866 0811 1806 0757 0480 0757 0401 0698 5089 0757 0460 0698 5092 0698 5090 0757 0401 0757 0457 2100 1857 2100 1863 0811 1807 5080 7104 0686 1015 0686 1535 0686 7505 0686 1015 0686 1535 0686 4345 0686 5635 0686 1025 2
34. and satisfactory null detector is a 50 millivolt meter movement On a 100 division scale a two millivolt change in voltage results a meter deflection of 4 divisions which is adequate resolution Suit able differential voltmeters are Fluke Model 801H and Keithly Model 660 Care must be exercised when using an electronic null detector in which one input terminal is grounded Measurement techniques require the monitoring resistor used not to exceed a temperature of 80 C in free air If forced air cooling can be employed the wattage required can be reduced to 300 watts All constant current measurements are made with the positive output terminal grounded 62694 TABLE 5 2 REPLACEMENT GUIDE Check the following and readjust If you change QIB CRO CRI6 Load Regulation constant voltage 19 20 25 Q6 Q7 QS Regulation transient response R7 R36 constant voltage Q2A Q2B Q4 VR2 Line R34 and load regulation con stant current Q19 Q20 VRI VR2 Line Regulation at 15 4 volt source CR43 CR44 Q23 VR2 Series Regulator voltage R75 6 269A 29 TABLE 5 3 H LAB suggested Component Characteristics Designation Replacement QG NPN Si planar 41 11 710 2 2195 GE 50 lt App 7250 soma 2N2219 Mot Veg LV 0 25 ma 30V Q23 Q24 PNP Silicon 2N3702 2N3702 11 DU lt hpp lt 300 ic 50 SOS TI Vcg 5 100
35. ative If the output voltage cannot be changed follow the trouble shooting procedure as outlined in Section 5 20 5 28 Regulated Bias Adjustment A A differential voltmeter is used to monitor the voltage between 5 and 32 B R59 is adjusted so that this voltage is approximately 15 4 volts C The input line voltage is varied 10 around nominal value The voltage should not vary more than 10 mv as the input line voltage is varied 5 29 Series Regulator Voltage Adjustments A The output of the power supply is set a 4 volts and 50 amperes The volt age across points 29 and A4 series regulator voltage is monitored using a Simpson 269 or equivalent R75 is adjusted for 3 8 volts 0 2 volt D The output of the power supply is set at 40 volts and 50 amperes The volt age is checked for 3 8 volts 40 4 volt C The value of R80 is increased to 270K and steps A and B above are repeated for 50 cycle operation 5 30 Constant Current Adjustments The output voltage of the power supply is set to 4 volts The coarse current adjust is set to a maximum clockwise position The fine current control is set to the maximum counterclockwise position The power supply is short circuited R25 is adjusted so that the output current is limited to 50 0 amps 31 Note The output voltage will dropsince the power supply will go into constant current operation 62694 The coarse current control is set to maximum counterclockwise position
36. by charging the ramp capacitor with a current controlled by Q24 in accordance with the signals applied to its emitter R80 connected between the emitter of 024 and the negative output bus is the source of a signal which is proportional to the output voltage R78 and R79 sense the voltage across and the current through the series transistor This signal polarity is positive with respect to the signal injected through R80 The slop of Ep is proportional to the output voltage the output current and the voltage across the series transistors For a given load current is directed such that the series regulator voltages is maintained constant for all output voltage conditions C19 and R81 provide equalization necessary to maintain loop stability 4 10 is a negative fullwave rectified sinewave voltage attenuated by the divider action of R68 and R69 and coupled into the summing point by means of the ramp itor The amplitude of is directly proportional to the input line voltage C16 is used to smooth out any distortion which occurs in the cusp region zero volts 4 11 The algebraic summation of and gives rise to a composite waveform Eg The level necessary to fire the pulse generating circuit is Ey Upon reaching the voltage diodes CR38 and CR37 apply a turn off signal to the base of 022 which in turn applies a turn on signal to the base of 021 The output of 21 is coupled to the gates of the silicon c
37. d 0686 8235 1 R86 fxd film 15K 1 1 8W 1 0757 0446 1 R87 fxd film 4 1 1 8W obd 0698 5090 R88 fxd comp 15 5 obd 9686 1535 R89 fxd comp 39Ka 5 W 1 0686 3935 1 699 fxd comp 180 459 W 1 0686 1845 1 R91 fxd comp 3Ka 5 1 obd 0686 3025 1 R32 fxd comp 33Ka 5 W 1 obd 0686 3335 1 R93 fxd comp 51Ka 5 W 2 abd 0686 5135 1 R94 95 fxd comp 27 5 iW 2 obd 0686 2735 1 R96 fxd comp 150 5 5 1 obd 0686 1515 1 R97 fxd comp 22Ka 5 2W 1 0686 2235 1 R98 fxd comp lKa 5 2W obd 0686 1025 R99 fxd film 47 5Ka 1 1 8W obd 0757 0457 8100 ww 5 Modify 110 F4 2100 1824 R101 var ww 250 Modify 110 4 2100 0439 R102 fxd comp 6204 5 W obd 0686 6215 R103 104 fxd comp 1004 5 iw obd 0686 1015 R106 fxd comp 51Ka 5 W obd 0686 5135 R107 fxd comp 1204 5 4W obd 0686 1215 T4 Power Transformer 626991A T2 Bias Transformer 626893 18 Pulse Transformer 642895 51 Thermal switch 100306 1 0440 0042 VRI Diode zener 9 4V 5 T C 1N2163 1902 0762 VR2 Diode zener 6 2V 5 1 821 1902 0761 62694 6 7 MISCELLANEOUS Chassis Welding Assembly Chassis Side Left Chassis Side Right Chassis Front Chassis Center Bracket Transformer Bracket Heat Sink Mtg Chassis Rear Assembly Gusset Baffle Fan Cover Front Panel Plate Heat Sink Mtg Bracket Board Bracket P Board Bracket
38. described in this section of the manual 3 8 OPERATING PROCEDURE 35 9 step by step operating procedure for the instrument 15 outlined in Figure 3 1 The steps are keyed to controls and indicators on the figure 3 10 REMOTE PROGRAMMING CONSTANT VOLTAGE 3 11 The power supply may be programmed from the remote location by means of an external voltage source or a resistance 1 necessary to change the strapping pattern on the barrier strip on the rear panel The front panel is disabled when the following remote programming procedures are followed a Resistance Programming See Figure 3 5 1 Stable low noise low temperature coefficient less than 30 pom per degree Centigrade programming resistors should be used 00 HARRISON 6263 A DE POWER SUPPLY HEWLETT PACK ART CAUTION MAX VOLTAGE 7 p CURRENT COARSE FINE COARSE FINE Q amp AC GNO ACC TURN AC POWER ON 4 ADJUST COARSE AND FINE CURRENT CONTROLS 2 ADJUST COARSE AND FINE VOLTAGE CONTROLS UNTIL THE CURRENT ON THE OUTPUT CURRENT UNTIL THE VOLTAGE ON THE OUTPUT VOLTAGE METER 15 OF DESIRED VALUE METER 15 OF DESIRED VALUE 5 REMOVE SHORT AND CONNECT LOAD 4 SHORT CIRCUIT THE OUTPUT TERMINALS OPERATING PROCEDURE FIG 3 1 3 2 1 2 3 1 2 3 4 5 6 The output voltage will vary at a rate determined by the pro gramming coefficient 200 ohms
39. el 269 0 150 volts 0 300 volts AC Voltmeter Accuracy of 3 Measure Input Weston 300 volt range Line Voltage Model Expanded Scale 1301109 Variable Transformer 0 280 Volt ranges Change AC Superior Type 28 amp current capacity Input Voltages 12566 Oscilloscope 200 sensitivity Measure 08 Model differential input Ripple Trans 130C jent Response Differential Voltmeter 1 mv Resolution Measure pee Note 1 Regulation Load Switch 30 ampere transistor load Measure Tran Switch or equivalent with sient Response 10 psec rise and fall time 62694 Deed TABLE 5 1 Cont d suggested Instrument Characteristics USE Test Equipment Load 0 8 ohms 2500 watts Measure Loaded 0 4 ohms 1500 watts and Characteristics at 0 08 ohms 400 watts 40 volts 20 volts and 4 volts Current Monitoring 0 02 ohm 1 1000 watts Measure Constant Re sistor 20 pom Temperature Current Operation See Note 2 Coefficient and Adjust Ammeter NOTE 1 A satisfactory substitute for a differential voltmeter is a stable reference voltage CAUTION NOTE AS CAUTION and nuli detector One side of the reference voltage is connected to the power supply sensing terminal The null detector is connected between the other power supply sensing terminal and the regerence voltage A null meter hg Model 425A or DC coupled scope utilizing the differential input Model 130C may be used as the null detector A simple
40. ent given only first timo the part number is listed d Manufacturer s part number e Manufacturer s code number Refer to Table 6 3 for manufacturer s name and address f Part Number 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 Mis cellaneous 6 4 ORDERING INFORMATION 6 5 order a replacement part address order inquiry to your local Hewlett Packard sales office sce lists at rear of this manual for addresses 6 6 Specify the following information for each part a Model and complete serial number of instrument b Hewlett Packard part number c Circuit reference designator d Description 6 7 order a part not listed in Table 6 4 give a complete description of the part and include its function and location Table 6 1 Reference Designators assembly diode motor device signaling lamp capacitor Table 6 1 misc electronic part fuse jack relay inductor meter plug transistor resistor F J K L M P Q R Table 6 2 a amperes carbon cer ceramic coef coefficient com common comp composition conn connection crt Cathode ray tube deposited elect electrolytic encap encapsulated farads fixed
41. ent to the output terminals Remote Error Sensing Error sensing is normally accomplished at the rear terminals if the load is attached to the rear terminals Also provision is included on the rear terminal strip for remote error sensing Remote Programming Remote programming of the output voltage at 200 ohms volts is made available on the rear terminal strip Also the output current may be remotely programmed at 4 ohms amp Cooling Forced air cooling is employed Size 7 H x 16 3 4 Dx 19 W Standard Relay Rack Mounting Weight 93 pounds net shipping weight 120 pounds Finish Light gray front panel with dark gray case 0209A 1 00 WES SECTION 1 1 GENERAL INFORMATION 1 2 The Harrison Division LVR Series are regulated constant voltage constant current DC power supplies suitable for relay rack operation These power supplies are completely transistorized general purpose power supplies They are useful wherever continuously variable well regulated DC power sources are required The continuously variable current control may be used to set the maximum output Current overload or shortcircult current when the supply is used as a constant voltage source or the voltage control may be used to set the maximum output voltage volt age ceiling when the power supply is used as a constant current source 1 3 Front panel meters indicate the output current and voltage 1 4 The power supply has rear output termi
42. f Oak Manufacturing Co Crystal Lake Ill Bendix Corp Bendix Pacific Div No Hollywood Calif Phaostron Instrument and Electronic South Pasadena Calif Philadelphia Steel and Wire Corp Philadelphia Pa American Machine and Foundry Potter and Brumfield Div Princeton Ind TRW Electronics Components Div Camden N J Resistance Products Harrisburg Pa Shakeproof Div of Illinois Tool Works Elgin St Marys Pa 74193 74545 74868 Danbury Conn Waseca Minn 74970 75042 75183 75382 75915 76493 76530 76854 77068 77252 77342 77630 77764 78189 78488 78526 stackpole Carbon Co Stanwyck Winding Co Inc Newburgh Tinnerman Products Inc Cleveland Ohio Whitehead Metal Products Co Ine New York 79553 78307 Table 6 3 Code List of Manufacturers Continued MANUFACTURER ADDRESS Continental Wirt Electronics Corp Philadelphia Pa Mepco Div of Sessions Clock Co Morristown N J Bourns Inc Riverside Calif Howard jndustries Inc Racine Wis International Rectifier Corp El Segundo Calif Columbus Electronics Corp Yonkers N Y Goodyear Sundries amp Mechanical inc New York N Y Sylvania Electric Products Inc Electronic Tube Division Emporium Switchcraft Inc Chicago Metals and Controls Inc Spencer Products Attleboro Mass Re
43. f a class B amplifier which is drawing peak currents in excess of the threshold current the protection circuit will begin to limit the output current even though the ammeter which reads only the average current indicates a current considerably less than the threshold value 3 33 When the supply is used in the constant current mode of operation a voltage ceiling or threshold is established by the output voltage control That is if the IR product of the load and the constant current exceeds the threshold as established by the constant voltage control the supply will operate as a constant voltage supply 3 34 AUTOMATIC CROSSOVER 25535 There will be a time during which both the constant voltage input transistor and the constant current input transistor will be conducting This will occur when the power supply has been operating in the constnat voltage mode of operation and is over loaded or when the power supply has been operating in the constant current mode of operation and the load is changed so that the output voltage increases and exceeds the voltage ceiling threshold The transition during which both transistors are con ducting is called the crossover region 3 36 current threshold should be set at a minimum of 5 percent greater than the maximum ioad current when operating in the constant voltage mode of operation 3 37 The voltage threshold open circuit voltage should be set a minimum of 2 0 volts greater than the maximum ope
44. ferential voltmeter is connected across the sensing terminals The input line volt age is varied from low to high line value The output voltage should not vary more than 2 millivolis 2756 Load Regulation The power supply is operated at 40 volts out and 208 230 volts line A differential voltmeter is connected across the sensing terminals The output voltage should not decrease by more than 2 millivolts when a 50 ampere load is applied 6269 5 15 5 57 Transient Response The power supply is operated at 40 volts out and 208 230 volts line A switch having rise and fall time of 10pseconds or less is connected in series with a non inductive load resistor selected so that the power supply is operated at 5 0 amperes An oscilloscope is connected across the sensing terminals The put voltage should recover to within 10 millivolts of the nominal output voltage within 25 45 for both the loading and unloading transients The decay of the transients should be a smooth exponential decay without ringing overshoot or undersnoot 5 41 5 58 CONSTANT CURRENT 5 59 A 20 milliohm 1000 watt low temperature coefficient wirewound resistor see Note 2 Page 5 4 is connected in series with 0 78 ohm load The 20 milliohm resis tor 15 the current sensing or monitoring resistor The power supply voltage controls are turned to the maximum clockwise position and the load adjusted for 39 volts at 50 amperes 5 60 Ripp
45. ick recovery 4 9 UN Qn Vie m E T ar he Sete r 65 FIG 4 10 REFERENCE BIAS CIRCUIT 4 27 REFERENCE AND BIAS CIRCUIT Figure 4 10 4 28 The unregulated input voltage across C9 is finely regulated by means 017 0218 Q19 Q20 and associated circuitry The series regulator 020 is driven 019 an error amplifier and the error amplifier is driven by the differential amplifier O18 and 017 The reference element for the bias regulator and the entire unit is R58 and R60 are the comparison elements and VR2 is utilized for an additional bias source R65 mini mizes power dissipation in Q20 and C7 stabilize the bias regulator loop 4 29 REGULATOR CIRCUIT OPERATION 4 30 The circuit functions in constant voltage as follows when the output voltage changes The change may be a slow shift in the output voltage or an AC signal signals are fed to the base of through C1 and DC signals coupled through and R10 The signals are amplified reversed in phase and coupled to the base of Q3 through the diode CR3 4 3 In constant voltage operation Q3 is operating linearly and 04 is saturated Signals at base of Q3 are amplified inverted in phase and passed on to the error amplifier Q5 Depending on whether the unit is in constant voltage or constant current operation either Q3 or Q4 is operating out of saturation 4 32 The signal applied to Q
46. le Current An oscilloscope is connected across the current monitoring resis tor The current control is adjusted so that the output current is 50 0 ampere maxi mum peak to peak 120 cycle ripple should be less than 2 mv 100 ma excluding high frequency noise 5 61 Line Regulation A differential voltmeter is connected across the current moni toring resistor The power supply is operated at 50 amperes and 39 volts out The line voltage is varied from long to high line The output current should not change more than 10 ma 200uv across 20 milliohm 5 62 Load Regulation A differential voltmeter is connected across the current moni toring resistor The power supply is operated at 39 volts out and 50 amperes load The voltage across the current monitoring resistor is noted The external load is shortcir cuited The current magnitude as indicated by the differential voltmeter should not change more than 10 ma from that recorded at 39 volts output NOTE The supply will momentarily go into short circuit protection 6269 o G SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This section contains information for ordering replacement parts 6 3 Table 6 4 lists parts in alpha numerical order of the reference designators and provides the fol lowing information a Reference Designators For abbreviations refer to Table 6 1 b Description Refer to Table 6 2 for abbre viations C Total Quantity TQ used in the instru m
47. ling air along the sides and to the rear of the instrument should be considered when installing It should be used in an area where the ambient temperature does not ex cend 50 C POWER REQUIREMENTS 2 7 The all silicon LVR series can be operated from nominal 115V or 208 230 volts 48 to 63 cps source Units having a volt ampere rating greater than 2 000 operated from 208 230 volts AC The power input requirements are given in the speci fication sheet Units having a capacity greater than 2 000 VA are shipped from the factory normally wired for 230 volt operation If the instrument is to be used on a 208 volt line the following changes must be made a Unplug the line cord and remove top cover b Remove the hardware and wire from Tap 3 on the power transformer Tl on Reconnect hardware and wire to Tap 2 on transformer d Change from Tap 4 to Tap 3 on transformer T2 e Replace top cover Turn on instrument and operate normally 2 9 Instruments which are not fan cooled and operating at frequencies other than 57 63 cycles have the following options a The instrument can be operated at frequencies ranging from 48 to 63 cycles without internal adjustment at a maximum ambient of 35 C order to maintain operation maximum ambient of 50 C the internal adjustments outlined in Section 5 29 must be followed 28 THREE CONDUCTOR POWER CABLE 2 10 For the protection of operating perso
48. measurements The resistor should be a low noise low temperature coefficient less than 30 ppm C resistor and should be used at no more than 9 of its rating power SECTION IV BIAS BIAS REGUL ATOR REFERENCE AC gt LN CURRENT SENSING RESISTOR CONSTAN CURRENT o CONTRO So CKT be oa __ qo COARSE FINE VOLTAGE ADJUST OUT FIG 4 1 BLOCK DIAGRAM 4 OVERALL BLOCK DIAGRAM Figure 4 1 4 2 Two means of controlling the energy conversion are by controlling the SCR s in primary or in the secondary In primary switching the SCR s are placed in a back to back configuration and either center tapped or bridge diode rectification is utilized in the secondary The secondary switched converter employs SCR s and two diodes in a bridge configuration The function of the preregulator is to minimize the power dis sipated in the series control element for all output and input conditions The output current is monitored by a current sensing resistor The voltage across the current sensing resistor is directly proportional to the output current and provides signal volt age to the current limit input circuit The output voltage of the power supply is moni tored by a constant voltage input circuit through the sensing terminals Any changes in the output voltage output current are detected in the constant voltage constant current inpu
49. nals Power suppiy insulation per mits it to be operated as high as 400 volts off ground and either output terminal may be grounded 1 5 There are a number of optional modes which the power supply may be operated A Remote Programming The power supply may be programmed from a remote location by means of an external voltage source of resistance B Remote Sensing The degradation in regulation which will occur at the load because of the voltage drop occurring in the load may be ameliorated by using the power supply in the remote sen sing mode of operation oF Series Operation Power supplies are used in series when a higher output volt age than the maximum output voltage of the power supply is required or greater voltage compliance is reguired when the power supply is used as a constant current source 13 Parallel Operation This power supply may be operated in parallel with similar power supplies when a greater output current 15 required 1 6 INSTRUMENT IDENTIFICATION 1 7 Harrison Division power supplies are identified by a three part serial number tag The first part is the power supply model number the second part is the power supply serial number the third is the Manufacturing Code Letter The manu al applies directly to all instruments which carry the same Manufacturing Code Letter as appears on the instruments which carry the same Manufacturing Code Letter as rer appears on the Title Page of this manual
50. nnel the National Electrical Manufacturer s Association NEMA recommends that the instrument panel and cabinet be grounded This instrument should be equipped with a three conductor power cable which when plugged into an appropriate receptacle grounds the instrument 2 11 REPACKAGING FOR SHIPMENT 2 12 The following list is a general guide for repackaging an instrument for ship ment If you have any questions contact your local Hewlett Packard field office see list at rear of this manual for addresses a Use the original container designed for the instrument If a new container is required a foam pack and container can be ordered from Harrison Division The stock number is given in the table of replaceable parts under mis cellaneous Bs Wrap the instrument in heavy paper or plastic before placing it in the shipping container Ce Use plenty of packing material around all sides of the instru ment and protect the panel with carboard strips Use heavy cardboard carton or wooden box to house the instru ment and use heavy tape or metal bands to seal the container Mark the packing box with Fragile Delicate Instrument etc NOTE If the instrument is to be shipped to Hewlett Packard for service or repair attach to the instrument a tag identifying the owner and indicating the service or repair to be accomplished In any correspondence be sure to identify the instrument by model number and serial number dus
51. nstrument from the cabinet The perform ance test will be found in paragraph 5 51 6269 5 14 A systematic trouble shooting procedure can be followed with this instrument For instance if there is no voltage throughout the instrument check for obvious faults such as defective power cable or power line failure or improper strapping 5 15 Perform a visual inspection for broken leads overheated resistors or cold solder joints 5 16 The circuit consisting of series regulators and amplifiers presents a difficult problem for systematic trouble anaysis This is a feedback circuit in which a faulty component anywhere will affect the operation of the entire loop If it is necessary to replace any component refer to Table 5 2 Replacement Guide for adjustments or tests which may be necessary 5 17 SEMICONDUCTOR REPLACEMENT 5 18 Before removing any transistors from the power supply the transistors should be labeled so that in the event a defective transistor is found its circuit location may be identified and therefore aid in isolating the source of trouble 5 19 The semiconductors in Harrison Division power supplies generally have an H LAB designation Table 5 3 lists the characteristics of the semiconductors used in this power supply and suggested commercial replacements 5 20 DETAILED TROUBLE SHOOTING PROCEDURE 5 21 Measure Power Supply Voltages The following precautions should be taken before power supply voltages are meas
52. o pump current into the supply such that the direction of current flow in the series transistors will be reversed Itis necessary to load the tupply with a dummy load so that the direction of current flow in the supply does not change if the power supply is to be subjected to negative current loading MASTER SLAVE sis S 1 QI 16 SLAVE 2 EI iu E H A4 5 WS 5 21 FIG 3 9 AUTO PARALLEL A diode is connected across the output terminals of the power supply so that in the event a negative voltage is applied to the power supply the current will be shunted across the output terminals by the protective diode This diode is used to protect the series transistors and the electrolytic capacitor connected across the output terminals of the power supply 3 31 OVERLOAD PROTECTION CIRCUIT 3 32 Special notice should be taken of the action of the current regulating circuit The power supply will automatically switch to constant current operation when the power supply is overloaded in the constant voltage mode of operation The constant current regulating circuit will limit the output current to the magnitude established by the current control setting Since the protection circuit must necessarily be a fast acting circuit it follows that the power supply will not perform properly if the current threshold is exceeded in constant voltage operation For example if the load on the power supply consists o
53. oltage in less than 100useconds NOTE The load should be non induc tive The switch should have a maximum rise and fall time of 10 5 5 42 Constant Current Checks 5 43 The strap between A6 and minus is removed This removes capacitor C24 from across the output terminals of the power supply The positive output is grounded and the monitoring resistor placed in the positive leg 5 44 A 20 milliohm tesistor is connected inseries with a 0 78 ohm load The 20 milliohm resistor will be used to monitor the output current of the power supply It should be a stable low noise resistor having a temperature coefficient of 20 ppm or better and used at no more than 596 of its rated power Refer to 3 42 for recommended measurement tech niques The output voltage of the power supply is changed in constant current operation by changing the load 62694 SUP 2 45 The power supply is turned on and the front panel voltage controls set fully clockwise and adjust load for 39 volts at 50 amperes 5 46 Constant Current Ripple An oscilloscope is connected across the current toring resistor The maximum peak to peak ripple observed on the oscilloscope should not exceed 2 ma 100 ma 2 47 Line Regulation A differential voltmeter is connected across the current moni toring resistor The power supply is operated at 39 volts out and 50 amperes load and low line The voltmeter reading is noted The line voltage is changed to high line The
54. ontrolled rectifier by means of a pulse transformer T3 4 12 The firing angle is directly proportional to the time t necessary for the Es to reach Et Increasing line input increases Ee and time t Increasing output voltage and load current decreases the slope and time bru 4 4 INPUT R36 124 16 AN AEN T n ve OUT AMP FIG 4 5 SERIES REGULATOR DRIVER AND ERROR AMPLIFIER 4 13 The period of is equal to twice the line input frequency 120 cycles Reset is accomplished by application of a positive fullwave rectified sinewave to the cathode of CR36 Near the completion of the period becomes more positive than the receding reset sinewave in the cusp region and forward biases CR36 C17 is dis charged and returned to a voltage level established by CR35 and 6 4 14 A circuit configuration consisting of 024 R85 R86 and R87 forms an overvoltage detector One end of the divider is supplied from the 15 4 volt source and the other is connected to the negative output Fullwave rectified sinewave voltage is applied through R85 and exercises a stabilizing influence If the output rises above a predeter mined level Q24 is acted upon and conducts transmitting a turn off signal to the pre regulator control circuit The overvoltage circuit is set for approximately 11576 of maxi mum rated output CR45 and R89 form a turn on inhibitor circuit which limits the input peak currents 4 15
55. r supply may be improved in the constant current mode of peration when operating at reduced current levels by increasing the size of the current Sensing resistors The resistor should be selected so that at maximum Operating current the voltage drop across the resistor will now be a percent of maximum operating current rather than a percent of rated output current The resistor used to replace the current sensing resistor s should be a low noise low temperature coefficient less than 30 ppm C resistor It should be selected so that at maximum operating current it dissipates no more than 5 of its rated power 3 47 MULTIPLE POWER SUPPLY LOADING 3 28 It is imperative that each load taken from the power supply have two separate leads brought back to the power supply terminals if full advantage is to be taken of the low output impedance of the power supply and mutual coupling effects between equipments being powered from the same supply are to be avoided 3 29 NEGATIVE CURRENT LOADING 3 30 load on the power supply may cause current to flow into the positive terminal of the power supply rather than out of the positive terminal as in normal operation 1 the power supply may be subjected to negative current loading The series regulating transistors are unilateral devices and must always conduct in the forward direction if the output regulation of the power supply is to be maintained therefore an external source cannot be allowed t
56. rating voltage when Operating in the constant current mode of operation 3 38 __ MEASURING THE PERFORMANCE OF THE POWER SUPPLY 3 39 The measuring device differential voltmeter digital voltmeter or oscilloscope must be connected across the sensing leads of the supply or as close to the output terminals as possible when measuring the output impedance transient response regula regulation or ripple of the power supply in order to achieve valid measurements It is important that none of the output current flows through the lead lenghths in series with the monitoring device since such lead lengths can easily have an impedance of the same order of magnitude as the supply impedance and thus effectively invalidate the measurement 3 14 3 40 Connect either the positive or negative terminals of the supply to the chassis ground and the scope case to the same point making certain that the scope case is nc also grounded by some other means such as the power cord when measuring the power supply ripple Connect both scope leads simultaneously to the power supply ground terminal to be doubly certain that the scope is not exhibiting a ripple or trans transient spike that is not coming from the power supply 3 41 The monitoring device should be connected to the 5 and 5 terminals See Figure 3 2 not on the load terminals when conducting performance checks 3 42 It is recommended that four terminal resistor be used to make constant current
57. ronics Inc Amerock Corp Ferroxcube Corp of America Saugerties N Y Fenwal Laboratories Morton Grove Amphenoi Borg Electronics Corp Broadview Ill Radio Corp of America Commercial Receiving Tube and Semiconductor Div Manchester Rockford Semiconductor Products Dept Syracuse N Y Eldema Corp Compton Calif Transitron Electronic Corp Wakefield Mass Pyrofilm Resistor Co Cedar Knolls Arrow Hart Hegeman Electric Hartford Conn ADC Electronics Inc Harbor City Calif Caddeli Burns Mfg Inc Mineola N Y Dymec Division of Hewlett Packard Co Palo Alto Calif Motorola Inc Semiconductor Products Division Phoenix Arizona Westinghouse Electric Corp Semi Conductor D pt Youngwood Pa Uttronix Inc Grand Junction Colo Wakefield Engr Inc The Bassick Bridgeport Conn North American Electronics inc Lynn Mass Amathom Electronic Hardware Inc New Rochelle Beede Electrical Instrument Co Inc Penacook General Devices Inc Indianapolis Ind Nuclear Corp of America Inc U S Semcor Div Phoenix Arizona Milwaukee Wis Beverly Hills Calif Somerville 1 Wakefield Mass CODE Code List of Manufacturers MANUFACTURER ADDRESS Torrington Mfg Co West Div Van Nuys Calif Transistor Electronics Corp Minneapolis Minn Westinghouse Electric Corp Electronic Tube Div Elmira
58. search Products Corp Madison Wis Rotron Mfg Co Inc Woodstock N Y Vector Electronic Co Glendale Calif Carr Fastener Co Cambridge Mass Victory Engineering Corp Springfield N J Bendix Corp Red Bank Div Eatontown Herman Smith Inc Brooklyn N Y Central Screw Chicago Ill Gavitt Wire and Cable Co Div of Amerace Corp Brookfield Mass Grant Pulley and Hardware Co West Nyack N Y Burroughs Corp Electronic Components Div Plainfield Yardeny Laboratories Inc New York N Y Arco Electronics Inc Great Neck N Y TRW Capacitor Div Ogaliala Neb Radio Corp of America Electronic Components amp Devices Div Harrison N J Rummel Fibre Co Newark N J Marco Industries Anaheim Calif Philco Corp Lansdale Div Lansdale Pa MANUFACTURER ADDRESS Stockwell Rubber Inc Philadelphia Pa B Tower Co Inc Bridgeport Conn Cutler Hammer inc Lincoln fll General Electric Distributing Corp Schenectady N Y Miller Dial and Nameplate Co El Monte Calif Dale Electronics Inc Columbus Neb Elco Corp Willow Grove Pa Honeywell Inc Micro Switch Div Freeport HL Sylvania Electric Prod Inc Semicon ductor Prod Div Woburn Mass Stevens Mfg Co inc Raytheon Co Components Div Indus trial Components Operation Mansfield Ohio Tung 8o1 Electric Inc Quincy Mass South Chester Corp Newark Tru Ohm Products Memcor Chester
59. t circuit amplified in the error amplifier and applied to the series regu lator in a manner which tends to counteract the changes in the output voltage current The bias supplies furnish voltages which are used throughout the instrument for refer ence and supply purposes 4 3 BIAS AND RESET SUPPLIES 4 4 The windings of T2 supply AC voltage to the bias rectifiers and all pertinent voltages are shown in Figure 4 2 Alternating preregulating control voltages reset and AC compensation are also supplied by transformer T2 4 1 OUVWSHOS 9339 cv 913 5 So 160807 3 1 35502 68 132 EI COH LNOD 5 2 v 79 iNYISNO2 21 37 a Lu 622 80147105934 923 222 2 Qv 0 9292 2v 14 Py 822 1018 isnray SNi3 35470 ze g2W 104 iN3i4Hn2 113 yp 1 915 00 5 43 Boiv 10938 6 41 vo 1 628 42 21 mre penta aee cope meom emen best VRAA AR R n Qc o pscing creme POEM erent HE MP Mea var ame vr d am raras eher ip AATE ht MDA pe TON PET a 2 R83 T3 2 0 083 T SERIES E R82 REGULATOR our GATES 3 ouT C Cis 17V C
60. to check for zero current 2 31 ZERO SETTING THE METER 2 32 The meter pointer must rest on the zero calibration mark on the meter scale when the instrument is at normal operating temperature resting in its normal operating posi and the instrument is turned off To zero set the meter proceed follows A Turn on instrument and allow it to come up to normal operation temperature about 20 minutes Turn the instrument off Wait 3 minutes for power supply capacitors to discharge completely Rotate adjustment screw on top of meter clockwise until the meter pointer is to the left of zero and further clockwise totation will move the pointer upscale towards zero Turn the adjustment screw clockwise until the pointer is exactly over the zero mark on the scale If the screw is turned too far repeat steps C and D Turn meter adjustment screw counterclockwise about 15 degrees to break contact between adjustment screw and pointer mounting yoke but not far enough to move the pointer back downscale If the screw is turned too far as shown by the needle moving repeat the procedure The meter is now zero set for best accuracy and mechanical stability 2 33 Ammeter Calibration An external ammeter accurate to 1 0 or equivalent shunt is used to measure the output current at 50 0 amperes 2101 is adjusted so that the front panel meter indicates 50 0 amperes 2 34 Current Equalization Check The power supply is operated at 15 0 vol
61. ts out 20 0 amperes load and high line The voltage between points 29 and A4 is monitored using an AC coupled scope and the ripple unbalance should be less than 15 5 35 Programming Current Adjustment A A differential voltmeter is connected between S and 5 The strap between Al and 2 is removed An 8 0K 0 5 programming resistor is connected between AZ and S A decade resistance is connected in the position of R12 and the power supply is turned on The decade resistance is adjusted so the output voltage of the power supply as indicated by the differential voltmeter is 40 volts 2 The value of the decade resistance is noted The power supply is turned off and the decade resistance is replaced with a fixed resistor of equal value 45 62694 9513 D The value of the shunt resistor should be a minimum of 10 times the resis tance of R11 If it is less than this R11 should be replaced 5 36 Voltmeter Adjustment See 5 32 for meter zero adjustment An external voltmeter accuracy of 1 0 or better is used to measure the output voltage of the power supply The output voltage is set to 40 volts R100 is adjusted so the front panel meter indicates 40 volts 5 37 Load Regulation The power supply is operated at 40 volts out 208 230 line A differential voltmeter is connected between 5 and 5 The output current is varied from 0 to 50 amperes The output voltage should not decrease more than 2 mv when the load is applied 5 3
62. ukee Wis The Cornish Wire Co New York N Y Coto Coil Providence R I Chicago Miniature Lamp Works Chicago Ill Chicago 11 Midiand Mich Brookiyn N Y Cinch Mfg Co Dow Corning Corp Dialight Corporation Code List of Manufacturers Continued CODE MANUFACTURER ADDRESS 2993 General Instrument Corp Capacitor Diy Newark Drake Mfg Co Chicago Elastic Stop Nut Corp of America Union N J Erie Technological Products Inc Erie Pa Helipot Div of Beckman Instruments Inc Fullerton Calif Fenwal Inc Ashland Mass Hughes Components Division of Hughes Aircraft Co Newport Beach Calif Amperex Electronic Co Div of North American Phillips Co Inc Hicksville N Y Bradley Semiconductor Corp New Haven Conn Hartford Conn Chicago III 72765 72962 72982 73138 73168 72234 73445 73506 73559 73734 73978 Carling Electric Inc Federal Screw Products Inc Hardwick Hindle Co Memcor Components Div Huntington Ind Heinemann Electric Co Trenton N J Harvey Hubbel Inc Bridgeport Conn FXR Div of Amphenol Borg Electronics Corp Johnson Co International Resistance Co Philadelphia Pa Howard B Jones Div of Cinch Mfg Corp Use 71785 New York N Y Kulka Electric Corp Mt Vernon N Y Littlefuse Inc Des Plaines Ill J W Miller Co Los Angeles Calif Cinch City of Industry Cali
63. ured The voltage control pot and current con trol pot should be turned to the maximum clockwise position The power supply should be unloaded Itis advisable to make an ohmmeter check to be certain that neither the positive or negative output terminal is grounded The power supply may now be turned on The following voltages which are particularly critical should then be measured first 1 Reference Voltage This voltage is measured between S and 31 and should be 9 4 volts 40 4 volts 15 4 volt regulated bias voltage is out of tolerance or diode is probably defective if this voltage is out of specification 2 15 4 Volt Regulated Bias Voltage This voltage is measured between 5 and 32 It should be 15 4 volts 41 0 volts If this voltage is out of specification R58 may be defective Diodes VRI VR2 transistors 017 018 019 may be defective 3 6 2 Volts This voltage is measured between 5 and 30 It should be 6 2 volts 40 3 volts Diode VR2 is probably defective if this voltage is out of specification Continued on Page 5 12 6269 ded TABLE 5 1 suggested Instrument Type Required Characteristics Use Test Equipment DC Voltmeter Accuracy of 2 Measure DC oimpson Approx ranges Model 269 0 2 5 volts 0 50 volts 0 150 volts DC Ammeter or 0 50 amps Measure DC Equivalent shunt Accuracy 1 Currents 50mv 50 amp shunt AC Voltmeter Accuracy of 2 Measure AC simpson Approx voltage ranges Voltages Mod
64. ve desired thermal characteristics The base of is connected to the junction of the programming resistors and the current pullout resistor RZ4 through the impedance equalizing resistor R15 R23 is used to adjust the programming current CR4 R17 and R21 establish collector voltages for Q2 R94 AS CR49 R93 R B4 Q25 L R96 R98 SERIES SY FIG 4 9 FAULT INPUT CIRCUIT R es tOUT 4 24 OVERCURRENT AND SHORT CIRCUIT INPUTS Figure 4 9 4 25 Overcurrent protection is accomplished by means of Q26 and divider R84 and R95 Since Q26 is sensing around the current monitoring resistor R26 it will limit the out put current in accordance to the voltage established across R84 if the constant current input fails 4 26 Short circuit protection is accomplished by means of Q25 Q26 CR48 R52 R93 R95 and R96 Divider R52 R93 and R94 is connected between the series regulator collector and the 6 2 volt supply Q25 and Q26 are non conducting under normal con ditions however under short circuit conditions the increased voltage acros the series regulator drives 025 into the saturated mode of operation The voltage esiaolished divider R95 and R96 at the base of 026 forward biases 026 The action of 026 is to limit the current flow in the series regulator to a prescribed level While maintaining a safe power levelin the series regulator the current discharges the input capacitors rapidly and insures qu
65. volt MONITORING POINTS om dafs 3 5 IM E mH 5 i NOTE FOR LOW AC IMPEDANCE AT LOAD REMOVE STRAP FROM 6 AND ADD CAPACITOR DISIGO Wu Dp 1 EITHER THE POSITIVE OR NEGATIVE OUT PUT TERMINAL SHOULD BE GROUNDED w m m SHIELD 1 SHIELD PROGRAMMING RESISTOR FIG 3 4 REMOTE SENSING amp REMOTE PROGRAMMING 3 4 PROGRAMMING RESISTOR RE FIG 3 5 RESISTANCE PROGRAMMING REMOTE PROGRAMMING CONSTANT VOLTAGE REFERENCE IK yt VOLTAGE At A2 4 REFERENCE VOLTAGE FIG 3 5C VOLTAGE RESISTANCE PROGRAMMING REMOTE PROGRAMMING CONSTANT VOLTAGE 3 12 REMOTE PROGRAMMING CONSTANT CURRENT Resistance Programming See Figure 3 6A 1 Stable low noise low temperature coefficient less than 30 ppm per degree Centigrade programming resistors should be used 2 The output current will vary at a rate determined by the gramming coefficient See Remote Programming in Specifi cations The programming coefficient is determined by the programming current which can be varied by means of internal adjustment Voltage Programming See Figure 3 6B 1 The output current will vary in the following manner Ll cm y Reference Voltage md Amps VR M

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