HP 6477C User's Manual
Contents
1. ict AIG ABAZ AH AIO AS AB ATAG AB AG Je 5 S bs A2 AL AD SLAVE NOTE A JUMPER STRAP ON PC BOARD Ai 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 B484C A295F 1901 0336 Not required 8486C A90F 1901 0235 Not required 64595 A90A 1901 0338 OR 84720 1N3289 1901 5397 0 032 64750 1N1187A 1901 0320 0 082 6477C S3270 1901 0326 0 200 6479C 3270 1901 0326 0 252 6483C S3270 1901 0326 0 7520 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 an equal percentage change in the outputs of both the master and slave supplies This feature can be of considerable 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 bath supe plies than to a change i2. in 10us after preset trip voltage is exceeded For complete specifications refer to Appendix A G23 Rack kit for mounting one supply in standard 19 rack 031 380 Var 10 S phase input 57 63Hz 032 400Vac 10 3 phase input 57 62Hz 12 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 aum 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 uary through December respectively with f omitted The third part is 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 14 ORDERING ADDITIONAL MANUALS 1 15 One manual is shipped with each power supply Addi tional manuals may be purchased from your local Hewlet
3. ly 115 of maximum rating 3 Optional internal crowbar except on HP 6464C protects load from overvoltage condition 4 Turn on cir cuit limits peak line current during start up into low impedance loads 5 Phase balance circuit permits operation with fine to line input volt age imbalance up to 8 6 Overcurrent and over voltage circuits of master slave supplies used in auto series parallel or tracking opera tion can be interlocked i i i t Auto Series Parallel Tracking Operation HP 6434B 64830 Supplies may be connected in auto series or auto tracking except HP 6448B and 6483C which cannot be connected in auto series Up to three lower power models HP 6434B 6448B may be con Description nected in any of the above configurations Higher power model HP 6453A 6483C interconnection should ordinarily include no more This series of SCR regulated power supplies is designed for medi than two supplies um to high power applications requiring a fixed or variable de source with moderate regulation and ripple For supplies with better regula Remote Programming f tion faster response time and lower ripple see models HP The voltage and current outputs of the supplies can be programmed A 6259B 6274B on page 272 by a remote resistance or for most models a remote voltage source i Programming speeds and coefficients are detailed in the specifications i table i Operating Features a H All su
4. in or der to obtain discrete output voltages The switch should have make before break contacts to avoid momentarily opening the programming terminais during the switching interval Al4 AB AIR Alt lololo AO AS AB AT AG Hi A5 A4 45 8 AZ AZ AL AO VOLTAGE SOURCE NOTE A JUMPER STRAP ON PC BOARD Al MUST BE Bus Bus REHOVED FOR THIS MODE REFER TO TEXT Figure 3 4 Remote Resistance Programming Constant Voltage Unity Gain 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 volt 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 fiowing to terminal A2 and into the external voltage source a jumper strap on P C Board A1 must be removed see Fig urg 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 contro the constant current output of the supply The CURRENT controls on the front panel are automatically disabled by the f
5. 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 ginai purchase contract using the appropriate option num ber Five input options are available Option 001 208Vac 002 230Vac 003 460Vac 031 380Vac and 032 400V ac All of the optional line voltages may vary within 110 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 50 amperes maximum for a 230Vac input dictating that each conductor be at least number 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 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 An
6. phase 57 63 Hz 032 400 V ac 10 3 phase 28 5 A phase 57 63 Hz 040 prepares power supply to be programmed with resistance by an HP 6940B or 6942A 910 one extra operating and service manual shipped with each power supply Accessory 145454 casters for HP 6464C 6483C set of four GENERAL REMOTE CONTROL Load Transient Voltage Coefficient Net Welght Resistance Coefficient Resolution Recovery Tw Te Voltage Current Voltage esm JEA som 1500 Toren ar 50 ms 200 mv 200 22 2Q A 166 mv i0mv 12 5 mA 200 ms arte a Current NM FL NL FL Kg tb Options AFor operation with a 50 Hz input possible only with Option 005 the rms ripple and transient response specifications are increased by 50 This feature is not available Anac Input option must be specified when ordering these S phase models Special Option 330 must be orderad with models 5434B 5448B and 64660 5489C to be Programmed with an HP 895018 Power Supply Programmer Contact your local HP Fiski Engineer for ordering instructions 275 cA SECTION II 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 wit
7. 1 208 B1 208 and C1 208 i c On transformers A3T1 A3T2 and A3T3 discon nect three jurnpers between T1 OV and T2 230 T2 0V and T3 230 and T3 OV and T1 230 Connect three jump ers as follows T1 OV 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 identicat 2 24 Transformer Connections for 380Vac input Fora 380Vac input the OV tap on the primary transformer TB is connected to fuse F7 and the 380V tap is connected to fuse F8 The 400V tap is open The secondary windings are con nected as shown on the schematic Figure 7 7 2 25 Transformer T4 is connected in the delta star configu ration shown on Figure 7 7 For 380Vac operation connect tap AT to tap 380 on the B section tap B1 to tap 380 of the C section and tap C1 to tap 380 of the A section The three 400V taps are open 2 28 Transformers A3T1 A3T2 and A3T3 are connected in the delta delta configuration shown on Figure 7 7 For 380Vac operation connect T1 OV to T2 380V T2 0V to T3 380 and T3 OV to T1 380V The 400 taps on the three transformers are open 2 27 Transformer Connections for 400Vac input Fora 400Vac input the OV tap on the primary of T5 must be connected to
8. CURRENT controls of the stave unit are operative and the current fimit is equal to the lowest con trol setting If 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 loca sensing and programming CAUTION rr Model 64830 of the SCR 10 Series cannot be operated in Auto Series because this supply can not be floated at more than 100 de 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 frefer 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 contral setting 3 51 Protection diodes CRg connected across the output AGAR ZA asa mE But lalolelola i
9. ECTION IN OPERATING INSTRUCTIONS voran Figure 3 1 Front Panel Controls and indicators Typical SCR 10 Supply 31 TURN ON CHECKOUT PROCEDURE NOTE 3 2 The following checkout procedure describes the use i The supply output is held off for of the front panel controls and indicators Figure 3 1 and approximately 10 to 20 seconds f ensures that the supply is operational 3 after turmon by an internal controt a Set LINE ON switch 1 to on and observe that circuit pilot lamp fights b After turn on delay period see NOTE rotate To check out constant current circuit first turn off CURRENT controls fully clockwise and adjust VOLTAGE supply Then short circuit output bus bars and rotate VOLT controls to obtain desired output voltage on voltmeter AGE controls fully clockwise Turn on supply d After turn on delay adjust CURRENT controls 3 1 until desired output current is indicated on ammeter r e If supply is equipped with an overvoltage crowbar ma ABAZAL 810 AS AB AT AE 85 a4 45 5 AB A AL 20 Option 006 front panel will contain CROWBAR ADJUST geceli igleleigialgigivicie pot and lamp If 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 jamps and are described in Paragraph 3 24 Before connecting actual load to supply read the following paragraphs 33 OPERATIN
10. FER 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 contro will be disconnected by step b b Remove the designated jumpers A2 to A3 and P C Board and connect A 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 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
11. G MODES Figure 3 2 Normal Strapping Pattern 3 4 The 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 y the P C board below their respective terminals The follow 3 10 To select a constant current output proceed as fol ing paragraphs describe the procedures for utilizing the vari lows 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 at the rear of the manual 39 Constant Current a Short circuit output terminals and adjust CUR RENT controls for desired output current b Open output terminals and adjust VOLTAGE con trols for maximum output voltage allowable voltage limit as determined by load conditions If a toad 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 83 35 NORMAL OPERATING MODE 3 6 The power supply is no
12. MIT se TA EEE HP Part No 06477 80002 x DC POWER SUPPLY SCR 10 SERIES MODEL 6477C 83C ALSO COVERS MODEL 6479C OPERATING AND SERVICE MANUAL FOR SERIALS 11254 0101 AND ABOVE For Serials Above 1125A 0101 a change page may he included 100 Locust Avenue Berkeley Heights New Jersey 07922 Printed September 1971 TABLE OF CONTENTS Section Page I GENERAL INFORMATION incio 1 1 Description 1 5 Specifications 17 Options 1 9 Accessories 12 1 11 nstrument Manual identification 1 2 i 1 14 Ordering Additional Manuals nenn 1 2 b TE INSTALLATION essen nannte rta e RENTEN 2 1 2 4 Initial Inspection 21 2 3 Mechanical Check un 2 4 25 Electrical Check 2 1 2 7 Installation Data 2 1 29 Location nn u 2 1 2 11 Outline Diagram 2 1 2 13 Rack Mounting 2 2 2 15 Input Power Requirements 2 2 2 20 208 230Vac Conversion 2 22 380 400Vac Conversion 2 30 50Hz Ac input Option 085 2 32 Repackaging for Shipment Hi OPERATING INSTRUCTIONS 3 1 Turn On Checkout Procedure 33 Operating Modes ann 35 Normal Operating Mode 37 Constant Voltage 3 9 Constant Current 3 11 No Load Operation 3 13 Output Ranges Models 6466 and 6483C Only 3 15 Connecting Load uessrsrsenonsensneenensenenannnersenen 3 18 Grounding oiana siias 3 21 Operation Beyond Rated Output 3 23 Protection Circuits m 3 25 Optional Operating M
13. between loads and will retain full advantage of the low output impedance of the power supply Each pair of connecting wires shouid be as short as possible and twisted or shielded to reduce noise pickup If a shielded pair is used connect one endof the shield to ground at the power supply and leave the other end unconnected 3 17 IF load considerations require that the output power distribution terminais be remotely located from the power supply then the power supply output terminals should be connected to the remote distribution 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 100Vde above ground 300Vde above ground for Models 6475C 64770 and 64790 3 90 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 IN By fol lowing these recommendations and running a separate lead from each output bus to the load the
14. figuration in use there is a chance that the terminals might become open it is suggested that a 1kS2 resistor be connected across the programming terminals Like the programming resistor this resistor should be a tow noise low temperature coeffi cient type Note that when this resistor is used the resistance 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 value of the voltage source appearing across terminals AQ and A10 should not exceed 7 4 Vde if possible damage to the instrument is to be avoided 3 39 External resistor Rp should have stable low noise and tow temperature coefficient less than 30ppm per de gree Centigrade characteristics in order to maintain the stability and temperature specifications of the power supply Ald Al AI Aut AS M 45 3 A3 AZ Al AIO A9 AS A7 AG ay ojoje olol ale VOLTAGE SOURCE 10 62 VDC Figure 3 6 Remote Voltage Programming Non Unity Gain Constant Current 35 Note that it is possible to use the front panel current com t
15. 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 tans are left open 2 29 Transformers ASTI A3T2 and A3T3 are connected in an delta delta configuration as follows T1 GV to T2 400V T2 0V to T3 400V and T3 OV to T1 400V The 280V 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 only to readjust the output ripple as described in Paragraph 5 94 In rare instances it may be necessary to readjust the transi ent recovery potentiometer A1R48 if the supply shows signs of oscillating 2 3 232 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 tf it is not available contact your local Hewlett Packard field office 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 troubie S
16. h 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 cannectors that the cabinet and panel surfaces are free of dents and scratches and that the meters are not scratched or cracked 25 Electrical Check 2 6 The instrument should be checked against its electri cal specifications Section Y includes an in cabinet performance check to verify proper instrument operation 27 INSTALLATION DATA 28 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 lt should be used in an area where the ambient temperature does not ex ceed 5090 2 11 Outline Diagram 2 12 Figure 2 1 Mustrates the two basic outline shapes for power supplies of the SCR 10 Series 26 a eae A MODELS 6454C 6466C AND 6469C m 26 va tar zum ms 2 sagana KT B MODELS 6472C 84750 64770 6479C AND 64830 Figure 2 1 Outline Diagram 24 2 13 Rack Mounting 2 14 To rack mount the unit Option 023 is installed at the factory The user receivas the supply with rack ears attached to the side front
17. ions for CH and GC modes of ope 4 For operation with a 50 Hz input possible oniy with Option 005 the rms rippfe and transient ation N response specifications are increased by 59 For operation with a 50 Hz input possible only with Option 005 output current is linearly derse The output current rating is given In the same order corresponding with tha voltage rating ed from 100 at 40 C to 80 at 59 C 3 Sr un das Pa POWER SUPPLY OUTPUT RESTRICTIONS AS A FUNCTION OF LOADING WORT Hae o o POWER SUPPLIES MEET ALL SPECIFICATIONS IM KOH SHADED REGION 3 1 i w 30 t 2 5 i 2 UNSPECIFIED REGION FOR CC OPERATION t 5 MEETS SPECIFICATIONS IN CV OPERATION 1 Ez i 3 1 E z UNSPECIFIED REGION FOR BOTH CC AND CV MODES OF OPERATION i SPECIFIED REGION FOR CVOPERATION FICATIONS IN CC 5 ge ay OF RATED OUTPUT CURRENT An ac input option must be specified when ordering Line Cords Line cords are not supplied with models 6453A 6483C Size Model 6443B 89 H x 483 W x 445 mm D 3 5 x 19 x 17 5 Models 6434B amp 6448B 133 H x 483 W x 432 mm D 5 25 x 19 x 17 Models 64534 64568 amp 6459A 356 H x 483 W x 500 mm D 14 x 19 x 19 7 Models 6484C 6466C 6489C 6472C 64750 6477C 64790 2 64830 705 H x 483 W x 715 mm D 27 737 x 19 x 28 12 Option Descriptions HP 6434B 6448B Std 115 V ac 10 single phase 57 63 Hz 605 realignment for 50 Hz operati
18. ischarging into the supply if the supply is turned off AME AZ AT AIDAS AB AT AS E AG ASS A3 AZ AL AQ apelar E TAPER Ey CRARGING 7 lo E Ey BATTERY FULL CHARGE VOLTAGE lg CONSTANT CHARGE CURRENT Ey BATTERY VOLTAGE AT WHICH CHARGE RATE WILL BESIN TO TAPER WITH INSERTION OF Ry En amp Rye Figure 3 10 Battery Charging 4 NOTE A large battery connected as a load presents a large capacitance across the output terminals This capacitance coufd cause the supply to osch late particularly if remote sensing is employed To stabilize the supply potentiometer ATR48 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 a small resistance Ry in series with one of the load leads from the supply to the battery which alters the normally restangular charging plot in such 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 Au
19. 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 de output impedance at the load However AAAIBAIBAN AID AD AB AT AG ADAG 8 S m AS A2 Ai A i PSF Figure 3 7 Remote Sensing E 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 folowing actions be taken a Adjust equalization control A1R48 to remove os cillation or to achieve best possible transient response for giver long load lead configuration Refer to Paragraph 5 88 for discussion of transient response measurement b If performing adjustment in step a above does not remove oscillation connect a capacitor having similar char acteristics to those of the output capacitors C14 C2 etc used in the supply directly across load using short leads Readjust equalization control R48 as in step aj 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 a power supply simultaneously in the remote sensing and re mote programming modes 3 45 Auto Parallel Operation Figure 3 8 3 48 Two maximum SCR 10 power supplies can be con nected in an Auto Parallel arrangement to ob
20. its 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 autornatic crossover between constant voltage and constant current permits the operation to be unattend ed 15 SPECIFICATIONS 16 Detailed specifications for the power supply are given in Table 1 1 on Page 1 3 y 1 7 OPTIONS 8 Options are 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 2 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 63Hz 002 230Vac 10 3 phase input 57 63Hz 003 460Vac 10 3 phase input 57 63Hz 005 50Hz ac input Standard instrument is wired for nominal 60Hz ac input Option 005 includes re alignment and in some cases internal rewiring 008 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 circult conducting SCR across load with
21. n either supply alone 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 a 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 c Rotate the CURRENT control to the desired charging rate as read on the front panei ammeter d Rotate VOLTAGE control fully CCW and remove the short circuit e Rotate the VOLTAGE control to the desired full charge voltage as read on either the front 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 CRp prevents a charged battery from d
22. nstant 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 delivering more than 100 Watts to the load 3 11 No Load Operation 3 12 When the supply is operated without a load down programming speed is considerably slower than in normal loaded operation The actua 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 depending on the model number and the incremental change 3 13 Output Ranges Models 6466C and 6483C Only 3 14 Model 6468C 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 law 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
23. odes nennen 3 26 Remote Programming Constant Voltage 3 34 Remote Programming Constant Current au 3 40 Remote Sensing savose 3 45 Auto Paralle Operation 3 48 Auto Series Operation 3 53 Battery Charging a SF PS 3 2 e OB 37 3 58 Battery Discharging oo sees 38 3 62 Special Operating Considerations 38 3 63 Pulse Loading 38 SECTION GENERAL INFORMATION 11 DESCRIPTION 1 2 This power suppiy 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 suppty is a constant voltage constant current type that will furnish full rated output voltage at the maximum rated out put current or can be continuousty adjusted throughout most of the output range The front panel CURRENT con trols can be used to establish the output current limit over ioad 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 3 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 s
24. ollowing 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 factory If greater programming accuracy Is required it may be achieved by adjusting A1 R25 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 C programming resistors to maintain the power supply temperature coefficient and stability HOA AQ AU AIO AD AB AT AG AS AG S S AB AZ AL AO eat 1 a PROGRARHING RESISTOR 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 AS 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 con
25. oltage CV operation or 30 of maximum rated output current CC operation Y i i 2 For operation with a 50Hz input possible only with Option 05 output current is linearly derated from 100 at 40 C to 80 at 50 C Other specifications indicated in Table must be increased by 50 for a 50Hz input 13 Ga POWER SUPPLIES General Purpose 300 11 000 W Ouiput CA Models 6434B 6483C e Outstanding value low cost watt Protective Features e Up to 75 efficiency at full output In addition to the overload protection inherent in constant voltage Constant voltage constant current operation constant current operation there are many other built in protective features included in these supplies The features vary within the three model classifications as follows HP 6434B 8448B 1 Reverse voltage protection 2 Fused ac in put HP 6453A 6456B 6458A 1 AC line loss protection circuit monitors 3 phase input and cuts off SCR s and opens output bus if a phase drops out operation resumes when ac input returns to normal 2 3 phase input circuit breaker 3 Optional internal crowbar Op tion 006 protects load from overvoltage condition HP 6464C 6463C 1 High temperature protection thermostat opens input to power transformer and lights front panel indicator if supply overheats 2 Prolonged overload protection circuit is activated and lights front panel indicator if output current exceeds approximate
26. on 010 chassis slides 027 208 V ac 10 single phase 57 63 Hz 028 230 V ac 10 single phase 57 63 Hz 910 one extra operating and service manual shipped with each power supply Specifications continued HP 6453A 6456B 6459A An ac input option must be specified when ordering AC input connections are by means of a 4 conductor connector at rear of unit A matching Hubbell No 74136 plug HP part number 1251 1570 is furnished 001 208 V ac 10 3 phase 15 5 A phase 57 63 Hz 002 230 V ac 10 3 phase 14 A phase 57 63 Hz 003 460 V ac 10 3 phase 7 A phase 57 63 Hz 005 realignment for 50 Hz operation 006 overvoltage protection crowbar HP 64534 64594 HP 6456B 010 chassis slides 034 380 V ac 10 3 phase 8 5 A phase 57 63 Hz 032 400 V ac 10 3 phase 8 0 A phase 57 63 Hz 910 one extra operating and service manual shipped with each power supply HP 6464C 6483C An ac input option must be specified when ordering AC input connections are by means of enclosed 4 wire terminal block 001 208 V ac 10 3 phase 55 A phase 57 63 Hz 002 230 Y ac 10 3 phase 50 A phase 57 63 Hz 003 460 V ac 10 3 phase 25 A phase 57 63 Hz 005 realignment for 50 Hz operation 006 internal overvoltage protection crowbar HP 6477C 6479C 6483C HP 6466C HP 6469C HP 6472C 6475C 023 rack mounting attachments for standard 19 rack 031 380 V ac 10 3 phase 30 A
27. pplies in this series are of the constant voltage constant cur AC Power Requirements i rent type Large easy to read panel meters continuously monitor out The ac power requirements vary with the three model classifica put voltage current tions see option listings When powered from a 50 Hz source possi j Input and output power remote sensing remote programming and ble with option 005 the rms rippie and transient response auto series parallel and tracking connections are made to bus bars specifications increase by 50 The p p ripple specification is un and terminal blocks on the rear panel changed by line frequency de Specifications PERFORMANCE Load Effect Source Effect PARD A Current Voltage Current ms pp E66 RT u 10050 01 Ac E O 150 m GA 102 10 mit Whor2 Att 102 10mWft 1 or 2At 05 7 EUREN SACE pt BET ERS ID 56B 02 10mvtt idorl At 102 10 1 or LAT y 66 E EE CE ENS NA F z N AS i 003 A4my 015 16mV i 005 100mV 01 OI5A 160mW2Y Ko KV 10 05 100 m 15 mA 0 03 100 mv 10 1 300 mv i 800 mV Refer to page 264 tor complete specification definitions Under light loading conditions power supply may not meet all published specifications The 1Specifiad tor combined tine and foad regulation graph on the next page defines the permissibis operating reg
28. rce 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 Y the output voltage will vary at a rate determined by the con stant 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 may be achieved by adjusting AIR9 as discussed in Para graph 5 76 Aig AB AI2 Al AIGA AB AT AG A5 AG ASS A3 AZ Al AO elalgieialeld plete ge PPROGRAMMABLE RESISTOR Figure 3 3 Remote Resistance Programming Constant Voltage 3 29 The output voltage of the supply should be O 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 36 To maintain the stability and temperature coefficient of the power supply use programming resistors that have stabie low noise and low temperature coefficient less than 30ppm per degree Centigrade characteristics A switch can be used in conjunction with various resistance values
29. rift for 8 hours following 30 minutes warm up under constant ambient conditions TRANSIENT RECOVERY TIME Less than 50ms 100ms is required for output voltage recovery in constant voltage operation to within 5V 2V of the nominal output voltage following a load change from full load to half load or vice versa NOTE 2 METERS a A front panel voltmeter 0 250V and ammeter 0 GOA are provided Accuracy is 2 of full scale RESOLUTION Constant Voltage 44mV is the minimum output voltage change that can be obtained with the front panel controls Constant Current BOMA is the minimum output current change that can be obtained using the front panel controls REMOTE RESISTANCE PROGRAMMING Constant Voltage 300 ehms volt Accuracy 2 All programming terminals are en a rear barrier strip Constant Current 20 ohms ampere Accuracy 2 AN programming terminais are on a rear barrier strip COOLING Forced air cooling is employed by means of an inter nal fan WEIGHT 500 lbs net 555 lbs shipping SIZE 16 3 4 W x 28 1 4 H x 26 1 8 D The unit can be mounted in a standard 19 rack panel NOTES 1 Specifications apply only when a supply is delivering more than 5 of maximum rated output voltage CV opera tion or 5 of maximum rated output current CC operation and tb load is drawing more than 100W Restriction b is lifted when supply is delivering more than 30 of maximum rated output v
30. rmally shipped with its rear terminal strapping connections arranged for constant volts age constant current focal sensing focat programming single unit mode of operation This strapping pattern is shown in Figure 3 2 The operator selects either a constant NOTE voltage or a constant current output using the front panel controis local programming no strapping changes are As indicated on the Specification necessary Table 1 1 the supply may not meet all specifications under tight load 37 Constant Voltage conditions These constraints are due to minimum operating thresh 38 To select a constant voltage output proceed as fol tows 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 ta 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 32 olds inherent in the SCR 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 Co
31. rols already in the supply R3 and R4 as the gain control Rp by simply removing the external Rp and strapping ter minals AS and A6 together 3 40 Remote Sensing Figure 3 7 3 41 Remote sensing is used 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 8 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 ta 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 ply 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 nais 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 consult an HP Sales Engineer NOTE Due to the voltage drop in the load leads
32. t 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 308 230 380 400 460Vac 10 Three Phase 57 to 63Hz 50A per phase 230Vac OUTPUT 0 220V 0 50A NOTES 1 and 2 LOAD REGULATION Constant Voltage Less than 0 05 plus 100mY for a load current change equal to the current rating of the supply Constant Current Less than 0 1 plus 50mA for a load voltage change equal to the voltage rating of the supply LINE REGULATION Constant Voltage Less than 0 05 plus 100mV for any change within the input rating Constant Current Less than 0 1 plus 50mA for any change within the input rating RIPPLE AND NOISE Constant Voltage Less than 330mVrms 2V p p de to 20MHz NOTE 2 TEMPERATURE RATINGS Operating 0 to 500 Storage 40 to 47906 TEMPERATURE COEFFICIENT Constant Voltage Less than 0 03 plus BmV change in output per degres Centigrade change in ambient tol lowing 30 minutes warm up Constant Current Less than 0 06 plus 65mA change in output per degree Centigrade change in ambi ent following 30 minutes warm up STABILITY Constant Voltage Less than 0 15 plus 35mV total drift for 8 hours following 30 minutes warm up under constant ambient conditions Constant Current Less than 0 3 plus 250mA total d
33. tain an output current greater than that available from one supply Auto Parallel operation permits equal current sharing under all load conditions and allows complete contro of the output current from the master power supply The output current AiG AG ARAL AID iele ejl 1 35 A3 AS A AO pee sore fe LEAD LENGTHS FROM AND BUSES ON EACH UNIT TO LOAD Ry SHOULD BE EQUAL Figure 3 8 Auto Parallei Operation of the slave will be approximately equal to the master s out put current regardless of the load conditions Because the output current controls of the siave are operative they should be set to maximum to prevent the slave reverting to constant current operation this wouid 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 can be oper ated in Auto Series to obtain a higher voltage than that available fram 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 the master The master supply must be the most positive suppiy of the series The output
34. tomatic 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 AT must be removed see Figure 7 1 for loca tion Removal of this jumper ensures that the internal pro gramming current does not flow into terminal A2 Before operation the user should make sure thet 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 Ry Diode CRp protects the supply against reverse voltages As shown on Figure 3 11 Rx must be selected so that its ER drop is less than the maximum rated output of the supply yet greater than the battery voltage 3 2 AMAIAIZAH AD AU AB AT AS AS AG 5 5 A3 AZ AL AD fale tay i elelo j Ry Ey Ig BUT Ryly MUST BE S RATED OUTPUT VOLTAGE OF SUPPLY ANO gt Ep BATTERY ji NOTE A JUMPER STRAP ON PC BOARD Al MUST BE REMOVED FOR BATTERY DISCHARING RE
35. upply also con tains the front panel trouble famps associated with some of the protection circuits 14 Output voltage and current are continuously monitor ed on two front panel meters input power is cannected to a four pin connector on the rear 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 locatian 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 1 1 Figure 1 1 Typical 10kW Power Supply SCR 10 Series current capability is required Auto Parallel operation per m
36. user will be doubly certain that no load current will flow through the ac input wires to the supply 3 21 Operation Beyond Rated Output 3 22 The shaded area on the front panei meter tace indi cates the approximate amount of output voltege 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 internat 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 amp OVERCURRENT PROTECT or TEMPERATURE on the front panel If one of these lamps should light the operator should set the LINE 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 Y 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 3 3 operation 3 25 OPTIONAL OPERATING MODES 3 26 Remote Programming Constant Voltage 3 27 The constant voltage output of the power supply can be programmed controlled fram a remote location if required Either a resistance or voltage sou
37. y 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 nominaily 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 in this area a 2 20 208 230Vac Conversion 2 21 To convert the unit from a 202Vac Option 001 to a 230Vac Option 002 input or vice versa it is necessary on ly to restrap transformers T4 T5 and A3T1 T2 and T3 Na other changes are necessary 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 4 With the unit off remove jumper between T5 3 and T8 6 Connect new jumper between T5 2 and T5 5 Disconnect wire from fuse F8 to T5 6 and connect it be tween FB and T5 5 b For transformer T4 remove three straps between A1 230 81 230 and C1 230 and connect a strap between A
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