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Models 63005C and 63315D

1. DOCUMENT ONTROLE CONTROLLED DOCUMENT MODULAR POWER SUPPLIES MODELS 63005C AND 63315D OPERATING AND SERVICE MANUAL FOR MODEL 63005C SERIALS 1528A 00101 AND ABOVE MODEL 63315D SERIALS 1528A 00101 AND ABOVE For serials above 1528A 00101 a change page may be included Security 2 Agilent Technologies T 519 376 2430 617 Jim Nagy Don Rowe 866 298 2778 x417 Customer Service Representative Field Support Specialist F 519 372 1581 Test amp Measurement Fire Systems don roweGge com www gesecurity com Agilent Technologies Canada inc 514 832 2836 teiephone 625 6th Street East 2250 boul Alfred Nobei 514 832 2897 facsimile 4 Owen Sound 5 8 Saint Laurent Quebec ym nagy amp agrient com Canada H4S 269 www agilent com WORLDWIDE PRATHER LA HP Part No 5950 1738 Printed August 1975 Microfiche Part No 5950 1752 r SECTION GENERAL INFORMATION 1 1 DESCRIPTION 1 2 The two power supplies covered by this manual employ switching regulation for high efficiency and compact ness Both models have a maximum output power of 110 watts In the Model 63005C this power is delivered by a single 0 25V output with 22 amp load capacity The Model 63315D also provides an adjustable 5V output and in addition a pair of dual tracking outputs that can be set within a 11 4 to 15 75V range by a single screwdriver adjustment The Model 63315D s three outputs have in divid
2. THE SENI OR TERMINAL ON TB2 WILL SHUT DOWN ALL OUTPUTS SEE PARA 3 28 THE 5 WINDING OF A2TI CONSISTS OF THE ANODE LEAD 201 LOOPED THRU THE MAGNETIC CORE THE OTHER TWO WINDINGS ARE SINGLE TURN JUMPERS OF JNSULATEO WIRE DESIGNATED wi AND W2 THE PARTS LIST At CLOCK AND SWITCHING TRANSISTOR 2 Im In lo 1 1 1 1 1 1 300W i 1 i i 3065 20S 30 5 e2 Ou Sa A2 SWITCHING REGULATOR ASSEMBLY s 15V i i 1 ETT F j 7 H 1 2 ba 5045 eja 50u S 4 II PIN LOCATIONS A1Q5 CLOCK PULSES 4105 C TO E WITH NO LOAD 05 C TOE WITH 5V OUTPUT IN CURRENT LIMIT SECONDARY 157 STAGE LC FILTER INPUT 1ST STAGE LC FILTER OUTPUT 2ND STAGE LC FILTER OUTPUT FOR SEMICONDUCTORS ARE SHOWN BELOW TOP VIEWS oa A2U2 Oc 4 OC 7 1 5 15 3 2 6 fs fs fh 1 3 21 fi A2U3 ut 5 6 ay s 4294 AIU2 AQ3 4 CATHODE 3U4 2 201 AQT i 202 4302 33 7 gA 2 AICRS 4 TEST POINTS AIG TO AIG AIG TO D AG TO D 2 TO A2 18 2 TO A2 3 aO a2 D TO TB2 2OKHZ S
3. SWITCH PREREGULATOR CONTROL S iu v DUAL LINEAR REGULATOR ASSEMBLY Figure 4 1 Models 63005C and 63315D Simplified Schematic Diagram 4 2 excessive 105 switching transistor heatsink temperature opens thermal switch 51 to interrupt the 100V supply to the clock bias regulator This stops the clock to leave 105 safely turned off 51 remains open until the heat sink has cooled to a safe operating temperature 4 17 In case of an overvoltage condition at the 5V output of the Model 63005C or at any of the outputs of the triple output model an overvoltage trip pulse fires an SCR connected as a clock shutdown switch which shorts the 14 7V bias supply to the clock to shut down the switching regulator 4 18 5V Switching Regulator Assembly A2 Board 4 19 On the A2 board the 20kHz ac voltage at one secondary of switching regulator power transformer A2T2 is half wave rectified and then filtered by a 2 section LC filter to provide a regulated 5V dc output This board also contains circuits that regulate the output voltage turn on the switching regulator slowly when power is first applied limit the output current and shut down the supply if an overvoltage occurs at the 5V output The output voltage regulation slow turn on and output current limit functions are controlled through input signals to the pulse width mod
4. SECTION CIRCUIT DI AGRAMS AND COMPONENT LOCATION DIAGRAMS This section contains the component location and schematic diagrams for power supply Models 63005C and 633150 The first two sheets of the Figure 7 1 schematic covers the A1 and A2 boards of both models and sheet 3 covers the board used in the 63315D only Adjoining each sheet of the schematic is a circuit board component location MODEL 63O05C A2 A141 A1J2 UNDERNEATH R31 5V ADJ TB2 A4Li R34 CURRENT LIMIT ADJ diagram which shows the locations of the components on that board and also of the circled test points which appear on the schematic The most important test points are also marked directly on the backs of the circuit boards Major waveforms are also provided as a troubleshooting aid MODEL 633 50 At St A1J2 UNDERNEATH R31 5V ADJ RII T83 R9 CURRENT LIMIT ADJ R34 R23 CURRENT CURRENT LIMIT ADJ LIMIT ADJ MEASUREMENT CONDITIONS THESE WAVEFORMS WERE MEASURED BETWEEN THE iNDICATED TEST POINTS WITH THE SUPPLY ENERGIZED FROM 115 6DHz LINE EXCEPT FOR WAVEFORM G ALL WERE MEASUREO WITH THE OUTPUT OF THE SUPPLY UNLOADED THE OSCILLOSCOPE IN PUT WAS DC COUPLED ALL INDICATED AMPLITUDES ARE APPROX IMATE WARNING SOME CIRCUITS IN THIS INSTRUMENT ARE CONNECTED DIRECTLY TO THE INPUT AC POWER LINE ENERGIZE THE SUPPLY THROUGH AN ISOLATION TRANSFORMER TO A
5. Figure 5 5 Load Transient Recovery Time Waveforms 5 27 TROUBLESHOOTING 5 32 If the unit s output voltages are normal but diffi culties exist with its ripple noise or regulation proceed 5 28 Before attempting to troubleshoot this instrument to Ripple and Regulation Troubleshooting Table 5 2 ensure that the fault is in the instrument itself and not in an associated piece of equipment You can determine this with out removing the covers from the instrument by using the appropriate portions of the performance test of paragraph DISCONNECT INPUT 5 6 5 29 A good understanding of the principles of opera tion is a helpful aid in troubleshooting and the reader is advised to review Section IV of the manual before begin ning detailed troubleshooting Once the principles of oper ation are understood proceed to the initial troubleshooting PROCEED TO CHECK VOLT procedures in paragraph 5 30 5 30 Initial Troubleshooting Procedures WARNING WARNING SOME CIRCUITS IN THIS INSTRUMENT ARE CONNECTED DIRECTLY TO THE INPUT AC POWER LINE EXERCISE EXTREME CAUTION WHEN WORKING ON ENER All circuits on the A1 board as well as the primary GIZED CIRCUITS ALSO ENERGIZE THE THE SUPPLY THROUGH AN ISOLATION windings of transformer T2 on the A2 board are TRANSFORMER TO AVOID SHORTING AC H H I connected directly to the input ac line Exercise THROUGH THE TEST INS ME extreme caution when working on energized cir INPUT LEADS cuits A
6. Cleveland 44130 Tel 216 243 7300 243 7305 TWX 810 423 9431 330 Progress 80 Dayton 45449 Jel 573 859 8202 TWX 810 459 1925 3041 Kingsmill Parkway Columbus 43229 Tel 814 436 1041 OKLAHOMA PO Box 32008 Oklahoma City 73132 Tel 405 721 0200 TWX 910 830 6862 OREGON 17880 SW Boones Ferry Road Tualatin 97062 502 620 3350 TWX 910 467 8714 PENNSYLVANIA 111 Zeta Drive Pittsburgh 15238 Tel 4 2 782 0400 Night 782 0401 TWX 710 795 3124 1021 8th Avenue King of Prussia industriat Park King of Prussia 19406 Tel 215 285 7000 TWX 510 660 2670 SOUTH CAROLINA 6941 0 N Trenholm Road Columbia 29260 Tel 803 782 6493 TENNESSEE Memphis Medical Service only Tel 901 274 7472 Nashville Medical Service only Tel 615 244 5448 TEXAS Box 1270 201E Arapaho Rd Richardson 75080 Tei 214 231 6101 TWX 910 867 4723 PO Box 27409 6300 Westpark Drive Suile 100 Houston 77027 Tel 713 781 6000 TWX 910 881 2645 205 Bitty Mitchell Road San Antonio 78226 Tel 42 434 8241 TWX 910 871 1170 UTAH 2890 Soulh Main Street Salt Lake City 84115 Tel 801 487 0715 TWX 910 925 5681 VIRGINIA Medical On PO 12778 7 Center Sune 212 Norfolk 23502 Tel 804 497 1026 7 9854 2914 Hungary Springs Road Richmond 23228 Jel 804 285 3431 TWX 710 956 0157 WASHINGTON Bellelieid Office Pk 1203 114th SE Bellevue 98004 Tet 205 454 29
7. Model 63315D only A similar method is used for checking the 11 4 to 15 75V outputs of the Model 633150 An external supply is needed that can provide 15 to 18 Vdc at a current of at least 0 5 amps Its maximum available current should be no more than 5 amps To check the over voltage trip circuit for the positive 11 4 to 15 75V output energize the external supply and adjust its output to 18 volts Energize the 63315D supply and then momentarily connect the output of the external supply across the and COMMON RETURN output terminals of the 63315D posi tive to positive After disconnecting the external supply check that all outputs of the supply under test have dropped to zero volts and that deenergizing the supply for 10 seconds restores the outputs to normal j Model 63315D only To check the overvoltage trip circuit for the negative 11 4 to 15 75V output repeat the procedure given in step i above except connect the exter nal supply across the and COMMON RETURN output terminals of the 63315D negative to negative REMOTE SHUTDOWN k Verify that connecting a jumper between terminals E6 and SEN on TB2 reduces ail outputs of the supply to zero volts and that disconnecting the jumper restores all outputs to their normal voltages 3 3 If this brief checkout procedure or later use of the supply reveals a possible malfunction see Section V of this manual for detailed test troubleshooting and adjust ment procedure
8. appears on the face of the CRT The magnitude of this resulting signal can easily be much greater than the true ripple developed between the plus and minus output terminals of the power supply and can completely invalidate the measurement 5 19 Figure 5 3B shows a correct method of measuring the output ripple of a constant voltage power supply using a single ended scope The ground loop path is broken by floating the power supply output To ensure that no POWER SUPPLY CASE OSCILLOSCOPE CASE INCORRECT METHOD GROUND CURRENT 1G PRODUCES 60 CYCLE DROP IN NEGATIVE LEAD WHICH ADDS TO THE POWER SUPPLY RIPPLE DISPLAYED ON SCOPE POWER SUPPLY CASE OSCILLOSCOPE CASE A CORRECT METHODE USING A SINGLE ENDED SCOPE OUTPUT FLOATED TO BREAK GROUND CURRENT LOOP TWISTED PAIR REDUCES STRAY PICKUP ON SCOPE LEADS Figure 5 3 Ripple and Noise Test Setup potential difference exists between the supply and the oscilloscope it is recommended that they both be plugged into the same ac power bus If the same bus cannot be used both ac grounds must be at earth ground potential 5 20 To verify that the oscilloscope is not displaying ripple that is induced in the leads or picked up from the grounds the scope lead should be shorted to the scope lead at the power supply terminals The ripple value obtained when the leads are shorted should be subtracted from the actual ripple measurement 5 21 Measurement Procedure To measure the
9. two part serial number The first part is the serial number prefix a number letter combination that denotes the date of a significant design change and the country of manufac ture The first two digits indicate the year 10 1970 1171971 etc the second two digits indicate the week and the letter designates the U S A as the country of manufacture The second part is the power supply serial number a different sequential number is assigned to each power supply starting with 00101 1 12 If the serial number on your instrument does not agree with those on the title page of the manual Change Sheets supplied with the manual or Manual Backdating Changes define the differences between your instrument and the instrument described by this manual 1 3 ORDERING ADDITIONAL MANUALS 1 14 One manual is shipped with each power supply Additional manuals may be purchased from your local Hewlett Packard field office see list at rear of this manual for addresses Specify the model number serial number prefix and HP Part number provided on the title page Table 1 1 Specifications Models 63005C and 63315D INPUT 87 1 27Vac or 180 250Vac single phase 48 63Hz Voltafje range field changeable on terminal block Internally fused at 5A AC INRUSH CURRENT Less than 20A peak at turnon 1 1 LOAD EFFECT Less than 0 1 for a load current change equal to the current rating of the supply SOURCE EFFECT Less than 0296 for any change
10. 1 2W EB 2715 0686 2715 fxd comp 470 5 1 2W EB 4715 0686 4715 fxd comp 150 5 1 2W EB 1515 0686 1515 fxd comp 1K 5 1 2W EB 1025 0686 1025 fxd comp 330 5 1 2W EB 3315 0686 3315 fxd comp 22 5 1 2W EB 2205 0686 2205 fxd ww 220 5 2W BWH 0811 1763 fxd comp 22 5 1 2W EB 2205 0686 2205 fxd comp 18 5 1 2W EB 1805 0686 1805 IC linear regulator 723HC 1820 0196 diode assy 1906 0067 diode zener 16 2V 2W CD35767 1902 3214 Chassis Electrical inductor 16 7mH 5080 1806 A1 Mechanical heatsink bracket assembly heatsink bracket S1 insulator bracket mounting expanding insert brass 6 32 IC socket 16 pin U1 heat dissipators Q1 2 transistor insulator molded Q5 barrier block 8 term barrier block jumper fuseholder clips terminal tab 4 1 connections 5020 2512 5020 2528 0590 0193 ICN 163 S3W 1200 0507 6025D 1205 0282 0340 0503 0360 0680 0360 0523 6008 32CN 2110 0269 1251 4180 6 6 Table 6 3 Replaceable Parts A2 Mechanical heatsink bracket assembly heatsink bracket U2 Q1 insulator bracket mtg expanding insert brass 6 32 transistor insulator molded U2 transistor insulator mica U2 stand off 75 L1 mount shoulder washer L1 mount felt washer L1 mount terminal tab near R31 34 barrier block 5 term barrier block jumper heat sink bracket O1 O4 heat dissipator Q2 Q5 ter
11. 5 CHECK A201 02 VOLTAGE VRZ AND PINS 11 ABOUT 5V 12 13 OF AU Figure 5 8 A2 Board Troubleshooting Procedure WARNING SOME CIRCUITS IN THIS INSTRUMENT ARE CONNECTED DIRECTLY TO THE INPUT AC POWER LINE EXERCISE EXTREME CAUTION WHEN WORKING ON ENERGIZED StRCJITS ALSO ENERGIZE THE SUPPLY THROUGH AN ISOLATION TRANSFORMER TO AVOID SHORTING AC LINE ENERGIZED CIRCUITS TO GROUND THROUGH THE TEST INSTRUMENT 5 INPUT LEADS MEASURE VOLT AGE FROM 1TO CHECK A202 C3 C5 C6 R24 13 012 CB CIS ABOUT 2V OR 87 5 10 TO t6VOC A TP1 TO TP3 8 TO 10 0 ONE ENDOF A2RIG MEASURE VOLTAGE FROM TO 4 TERMINALS ABOUT 2V REINSTALL 2816 AND MEASURE DC VOLTAGE FROM A231PI3 TO YP18 ABOUT 4V OR NO ABOUT 9V CHECK A2R3 AND ASSOCIATED COM PONENTS AT INPUT OF AZU4 CHECK EREF FROM 27 13 TO TP20 6 8V TO 75 1 REPLACE ua CHECK ARCI C2 VRL 03 CHECK FOR DE FECTIVE 193 201 OR TO A2 INTER CONNECTION CHECK A2CRA CR5 LIFT ONE END OF 2822 AND MEA SURE DC VOLTAGE FROM A2TPI3 TO TP18 REPLACE A2U3 CONNECT THE Al AND A2 BDS TOGETHER WITHOUT A3 AND CHECK THE LOAD REGULATION OF THE WARNING SOME CIRCUITS IN THIS INSTRUMENT ARE CONNECTED DIRECTLY TO THE INPUT AC POWER LINE EXERCISE EXTREME CAUTION WHEN WORKING ON ENERGIZED CIRCUITS ALSO ENERGIZE THE SUPPLY THROUGH AN ISOLATION TRANSFORMER TO AVOID SHORTING AC LINE AVA2 TROUBLE
12. A1085 on a base drive pulse produced by a regenerative bias winding of A2T2 keeps A105 on until a turn off signal appears 4 11 Following each clock turn on pulse there are three signals that can turn off the switching transistor They are 1 a voltage control pulse from the pulse width modulator 2 a primary peak current limit pulse from a current limit comparator in the switching regulator 3 a turn off pulse from the clock The first of these three signals to appear after each clock turn on pulse turns A105 off until the next clock turn on pulse initiates the next operating cycle 4 12 Normally it is the voltage control pulse that turns off A105 An optically coupled isolator in its signal path provides electrical isolation between primary and secondary circuits The timing of this pulse controls the voltage of the 5V output A tendency for the output voltage to de crease is compensated by an increase in the delay between the clock turn on pulse and the subsequent turn off pulse from the pulse width modulator If the output tends to increase the delay is reduced Slow turn on control output current limit and remote shutdown signals are also commun icated through this path from the A2 board The generation of these signals is covered in the discussion of the A2 board 4 13 The second switching transistor turn off signal listed in paragraph 4 11 is produced by a fixed current limit comparator that monitors the peak current th
13. Table 6 3 give a complete description of the part its func tion and its location Table 6 1 Reference Designators miscellaneous electronic part assembly 7 blower fan 7 capacitor fuse Circuit breaker 7 Jack jumper diode relay 7 device signaling inductor lamp meter Table 6 1 Reference Designators Continued plug transistor resistor switch transformer terminal block thermal switch V vacuum tube neon bulb photocell etc VR zener diode socket integrated cir cuit or network Table 6 2 Description Abbreviations A ampere alternating current assy assembly bd board bkt bracket 9C degree Centigrade coef coefficient comp composition CRT cathode ray tube CT center tapped dc direct current DPDT double pole double throw DPST double pole single throw elect electrolytic encap encapsulated F farad F degree Farenheit fixed germanium Henry Hertz integrated circuit ID inside diameter incnd incandescent kilo 103 milli 103 mega 108 micro 10 metal manufacturer modular or modified mounting nano 109 normally closed normally open 7 nickel plated ohm order by description 7 outside diameter pico 10 12 printed circuit potentiometer peak to peak parts per million 7 peak reverse voltage rectifier 7 root mean square silicon 7 singl
14. The max imum load currents for the 15V nominal outputs and the 5V output cannot be obtained simultaneously but are inter dependent as shown in Figure 3 5 The 15V outputs draw power from two additional secondaries on the 20kHz switch ing regulator transformer and are regulated by two series transistor regulators connected in a master slave configura tion These outputs are individually protected against over current and overvoltage An overvoltage condition at any one of the supply s three outputs shuts down all three outputs 4 4 SIMPLIFIED SCHEMATIC DIAGRAM DISCUSSION 4 5 The following discussion of the overall circuit operation of the Models 63005C and 63315D is based on the simplified schematic of Figure 4 1 4 6 AC DC Converter Assembly A1 Board 4 7 Preregulator The ac input to the 1 board is connected through an RFI filter directly to the input of a preregulator bridge composed of two diodes and two SCRs The firing angle of the SCRs is controlled by the preregulator control circuit so that their full wave rectified output after being filtered by a 2 section LC filter averages 4 1 100 volts dc The preregulator control circuit consists of a comparator amplifier which compares the voltage at its input to a zener reference voltage and controls the firing delay of a programmable unijunction transistor in the firing circuit During each half cycle of the ac line input one output pulse from the unijunction is couple
15. W2 57 1590 9170 0567 transformer power Model 63005C 63005 80095 transformer power Model 63315D 63315 80090 IC linear timer NE555T 1826 0119 diode assy 1906 0067 IC linear transistor array CA3046 1821 0001 IC linear voltage regulator 723HC 1820 0196 diode zener 10V 5W CD35706 1902 0025 diode zener 5 9V 2W CD35641 1902 3110 jumpers windings 2 3 4 5 of T1 8150 3271 l3 See ca eo me Dual Linear Regulator Assy Model 63315D only C1 fxd cer O2uF 500V C023B501J2032525 0160 0468 C2 fxd elect 180uF 40V 672D 0180 2606 C3 fxd cer 0 1uF 50V 5C50B1 CML 0150 0121 C4 fxd mylar 02202 200V AE17C223KT 0160 0162 C5 fxd elect 2 24F 20V 150D225X0020A2 0180 0155 fxd cer O1uF 100V TA 0150 0093 C8 fxd elect 180uF 40V 672D 0180 2606 C9 fxd cer 0 47uF 25V 5C1187 CML 0160 0174 C10 fxd cer 02UF 500V C023B501J2032S25 0160 0468 C11 fxd elect 1804 F 40V 672D 0180 2606 C12 fxd mylar 0224F 200V AE17C223KT 0160 0162 C13 14 fxd cer O1uF 100V TA 0150 0093 C15 fxd elect 2 24F 20V 150D225X0020A2 0180 0155 C16 fxd elect 180uF 40V 672D 0180 2606 C17 fxd cer 0 474F 25V 5C11B7 CML 0160 0174 C18 fxd cer O1uF 1KV C023A102J103MS38 0150 0012 C19 fxd cer 0 1uF 50V 5C50B1 CML 0150 0121 C20 21 fxd cer 400V 33C17A3 CDH 0150 0052 CR1 2 diode si 400V 750mA SR1358 9 1901 0028 J1 connector female 10 cond 1251 3361 L1 2 inductor 63315 80091 13 4 inductor ferrite bead 02 05 emitters 56 590
16. blow 250V 312005 2110 0010 1 2 10 pin 09 52 3103 1251 0628 L1 inductor 370uH 5080 1807 Q1 2 silicon controlled rectifier 40869 1884 0233 Q3 4 SS NPN Si 2N2222A 1854 0477 05 51 2N6306 Selected 1854 0657 Q6 power PNP Si MJE 210 1853 0398 Q7 SS NPN Si 2N2222A 1854 0477 SS PNP Si 2N2907A 1853 0281 SS NPN Si 2N2222A 1854 0477 fxd comp 10 596 1 2W EB 1005 0686 1005 Not assigned fxd ww 6k 596 5W fxd ww 3k 5 3W fxd film 4 32k 196 1 8W fxd film 9 09k 196 1 8W fxd comp 270k 596 1 4W fxd comp 20 596 1 4W fxd comp 1 6k 596 1 4W fxd comp 6 2k 596 1 4W Wh NN a A N ANa 243E 0811 1559 VAL 3 0812 0010 4 1 0757 0436 7 1 0757 0288 CB 2745 0683 2745 CB 2005 0683 2005 CB 1625 0683 1625 CB 6225 0683 6225 fxd comp 160k 5 1 4W CB 1645 0683 1645 fxd comp 4 3k 5 1 4W CB 4325 0683 4325 fxd comp 160k 5 1 4W CB 1645 0683 1645 6 2 Table 6 3 Replaceable Parts fxd comp 1k 5 1 4W fxd comp 10k 5 1 4W film 39k 1 1 8W fxd film 100k 196 1 8W fxd film 6 49k 196 1 8W fxd ww 3k 596 5W fxd comp 100 5 1 2W fxd comp 100 596 1 4W fxd film 3 83k 1 1 8W fxd film 16 2k 196 1 8W fxd comp 100 596 1 4W fxd comp 47 5 1 4W fxd comp 18 596 1 2W fxd comp 820 596 1 4W fxd comp 18 596 1 2W fxd comp 1
17. limit circuit with the lower setting and the short circuit current is governed by the master supply 3 26 Overvoltage Protection 3 27 Each output of this supply has an independent fixed crowbar circuit to protect sensitive loads from exces sive voltages The circuit for the 5V output is activated between 6 and 7 volts and the ones for the dual outputs of the Model 63315D are activated between 16 and 18 volts After a crowbar circuit fires all outputs of the supply fall to zero volts To restore normal operation after an over voltage shutdown has occurred ac power must be removed from the supply for at least 10 seconds f the crowbar trips again when power is restored refer to the trouble shooting information in Section V of this manual RATED OUTPUT CURRENT OR 224 MIN ADJ RANGE FACTORY SETTING TYPICAL Tout 4 RATED OUTPUT CURRENT FACTORY SETTINGS MASTER SLAVE 7 SEPARATELY ADJUSTABLE Figure 3 7 Model 63315D Dual Output Current Limit Characteristics 3 4 3 28 Remote Shutdown 3 29 If remote control of the power supply is required all outputs of the supply can be operated remotely through a contact connected from terminal EG on TB2 to either the or the SEN terminal of the 5V output Closing this contact reduces all outputs to zero volts opening it restores all output voltages to normal 3 30 The remote shutdown input can also be controlle
18. parator The input pulse to the isolator turns on a light emitting diode LED which turns on a phototransistor When the phototransistor conducts it turns off switching transistor 105 4 22 Now that A1O5 has been turned off the negative going voltage at the input to inductor A2L1 resets the pulse width modulator for the next operating cycle which begins when the clock turns on A1Q5 again 4 23 If the voltage at the 5V output tends to decrease the dc level input to the pulse width modulator increases As a result it takes slightly longer for the ramp waveform of the ripple voltage to exceed this higher dc level at the comparator inputs Thus the delay before A105 is turned off is increased slightly to increase A1Q5 s conduction time and compensate for the decreased output 4 24 Slow Turn on Control The slow turn on control circuit prevents an output voltage overshoot from occuring and actuating the overvoltage trip circuit when ac power is first applied to the supply The circuit consists of an r c network that slows down the initial rise in voltage of the dc level input to the pulse width modulator from the con stant voltage comparator This causes the switching regulator to bring up the output voltage smoothly to its nominal value 4 25 Output Current Limiting The 5V output is pro tected against an overload or short circuit by an adjustable foldback current limit circuit which reduces the output voltage and current as an over
19. ripple and noise on each supply outputs follow the steps below If a high frequency noise measurement is desired an oscilloscope with sufficient bandwidth 20MHz must be used Ripple and noise measurements can be made at any input ac line voltage combined with any dc output voltage and load current within rating Connect an oscilloscope or rms voltmeter across an output of the supply as shown in Figure 5 3B b Energize the supply and observe the oscilloscope or meter indication The ripple and noise should not be greater than 5mV rms 40mV c Repeat for the remaining supply outputs 5 22 Load Transient Recovery Time Definition The time it takes for the output voltage to recover to within 1 of the nominal output following step change in output current from full to half load or vice versa 5 23 11 4 to 15 75 Volt Outputs To test the load transient recovery time a repetitive load switch with a fast switching time is required for loading and unloading the supply Figure 5 4 shows one way of constructing one using a relay with mercury wetted contacts When this load switch is connected to a 60Hz ac input the mercury relay opens and closes 60 times per second The 25kQ control adjusts the duty cycle of the load current switching to re duce jitter in the oscilloscope display Th s load switch can also be used with a 50Hz ac input 5 24 To check the load transient recovery time of each of the 11
20. section contains information for ordering re placement parts Table 6 3 lists parts in alpha numeric order by reference designators and provides the following informa tion Reference Designators Refer to Table 6 1 b Description Refer to Table 6 2 for abreviations c Total Quantity TQ Given only the first time the part number is listed except in instruments containing many sub modular assemblies in which case the appears the first time the part number is listed in each assembly d Manufacturer s Part Number or Type e Manufacturer s Federal Supply Code Number f Hewlett Packard Part Number g Recommended Spare Parts Quantity RS for complete maintenance of one instrument during one year of isolated service h Parts not identified by a reference designator are listed at the end of Table 6 3 under Mechanical and or Miscellaneous The former consists of parts belonging to and grouped by individual assemblies the latter consists of all parts not immediately associated with an assembly 63 ORDERING INFORMATION 6 4 To order a replacement part address order or in quiry to your local Hewlett Packard sales office see lists at rear of this manual for addresses Specify the following information for each part Model complete serial number and any Option or special modification J numbers of the instrument Hewlett Packard part number circuit reference designator and description To order a part not listed in
21. 05 0683 1025 0683 4315 56289 0811 1224 44655 0811 1220 0683 1035 0811 1827 0757 0388 0757 0438 0757 0720 0757 0438 44655 0811 1220 0812 0010 0683 1005 28480 0837 0129 28480 3103 0049 28480 5080 1808 28480 5080 1809 1858 0046 1826 0119 1990 0543 05245 9135 0036 1902 0049 1902 3203 1902 0661 1902 0586 56289 0180 0587 56289 0180 0155 56289 0150 0121 0160 0162 56289 0180 0155 56289 0180 0228 0180 0100 MFR DESCRIPTION MFR PART CODE HP PART NO m Table 6 3 Replaceable Parts MFR DESCRIPTION MFR PART CODE HP PART NO fxd elect 2 2uF 20V 150D225X0020A2 0180 0155 fxd elect 2000uF 10V fxd mylar O68uF 200V 292P68392 PTS 0160 0166 fxd cer 0 1uF 50V 5C50B1 CML 0150 0121 fxd cer 1uF 25V 5C15C2 CML 0160 0127 fxd ObuF 400V 33C17A3 CDH 0150 0052 diode silicon FDH 6308 1901 0050 inductor 123uH 5080 1810 inductor 8 2 1537 34 9140 0105 inductor 5uH 5080 1811 connector male 10 cond Model 633150 SCR including mica insulator SS PNP Si fxd 10 5 1 4W fxd comp 470 5 1 4W fxd comp 75 5 1 2W fxd comp 1 3k 5 1 4W fxd comp 4Z7k 5 1 4W fxd comp 6 2k 5 1 4W fxd comp 3k 5 1 4W fxd comp 180 5 1 4W fxd comp 3 3 5 1 4W fxd film 2 37k 1 1 8W fxd comp 47k 5 1 4W fxd film 4 32k 1 1 8W 09 64 1103 1251 0629 2N4441 1884 0082 2N2907A 1853 0281 CB 1005 0683 1005 CB 4715
22. 0683 4715 EB 7505 0686 7505 CB 1325 0683 1325 CB 4725 06834725 CB 6225 0683 6225 CB 3025 0683 3025 CB 1815 0683 1815 CB 33G5 0683 0335 MF4C 1 0698 3150 CB 4735 0683 4735 1 0757 0436 fxd film 3k 1 1 8W 4 1 0757 1093 fxd comp 150k 596 1 4W CB 1545 0683 1545 fxd film 3k 1 1 8W 1 0757 1093 fxd comp 470 5 1 4W CB 4715 0683 4715 fxd film 21 5k 196 1 8W MF4C 1 0757 0199 fxd film 1 5k 1 1 8W 1 0757 0427 fxd comp 22k 5 1 4W CB 2235 0683 2235 fxd film 12 7 196 1 8W 993 0698 4356 fxd comp 22k 5 1 4W CB 2235 0683 2235 fxd comp 2 2k 596 1 4W CB 2225 0683 2225 fxd comp 470 5 1 4W CB 4715 0683 4715 fxd alloy 002 ohms 5020 2519 fxd comp 82k 5 1 4W CB 8235 0683 8235 fxd comp 100 5 1 4W CB 1015 0683 1015 fxd ww 5 5 10W 247E 0811 1893 fxd film 3 32k 1 1 8W 1 0757 0433 fxd 025 ohms 5080 1814 fxd film 3 32k 196 1 8W MFAC 1 0757 0433 var 2k 72XR2K 2100 3273 fxd film 1 33k 196 1 8W CEA 993 0757 0317 fxd film 5 62k 1 1 8W MFAC 1 0757 0200 var 3386X 502 2100 3207 fxd comp 1k 5 1 4W CB 1025 0683 1025 fxd comp 330 5 1 4W CB 3315 0683 3315 es Ss SB WAR 6 4 Tabte 6 3 Replaceable Parts REF MFR DESIG DESCRIPTION PART NO CODE HP PART NO fxd comp 10 5 1 4W CB 1005 0683 1005 fxd comp 27 5 1 4W CB 2705 0683 2705 magnetic core toroid use with W1
23. 12 636 0700 TWX 910 563 3734 MISSISSIPPI Jackson Medical Service only Tel 601 982 9363 MISSOURI 11331 Colorado Ave Kansas City 64137 816 763 8000 TWX 910 771 2087 148 We don Parkway Maryland Heights 63043 Tel 314 567 1455 TWX 910 764 0830 NEBRASKA Medical 11902 Eim Suite 4C 68144 Tel 402 333 6017 NEW JERSEY W 120 Century Rd Paramus 07652 Tel 201 265 5000 TWX 710 990 4951 NEW MEXICO Box 11634 Station E 11300 Lomas Blvd NE Albuquerque 87123 Tel 505 292 1330 TWX 910 989 1185 156 Wyatt Drive Las Cruces 88001 505 526 2485 TWX 910 983 0550 NEW YORK 6 Automation Lane Compuler Park Albany 12205 518 458 1550 TWX 710 441 8270 Calculators Only 1251 Avenue of the Americas floor 32 Suite 3296 New York City 10020 Fel 1212 265 5575 New York City Manhattan Bronx Contact Paramus NJ Tei 201 265 5000 Brooklyn Queens Richmond Contact Woodbury NY Oflice 516 921 0300 201 South Avenue Poughkeepsie 12601 Tat 814 454 7330 TWX 510 248 0012 39 Saginaw Drive Rochester 14623 716 473 9500 TWX 510 253 5981 5858 East Molloy Road Syracuse 3211 315 455 2486 TWX 710 541 0482 1 Crossways Park West Woodbury 11737 Fei 516 921 0300 TWX 510 221 2168 NORTH CAROLINA PO 5188 1923 North Main Street High Point 27262 Tel 919 885 8101 TWX 510 926 3516 16500 Sprague Road
24. 3307 Tel 305 731 2020 TWX 510 955 4099 Jacksonville Medical Service only Tei 904 725 6333 13910 6177 Lake Ellenor Dr Orlando 32809 Tai 305 859 2900 TWX 810 850 0113 23 East Wright St Suite 1 Pensacola 32501 Tel 904 434 3081 GEORGIA Box 28234 450 Interstate North Atlanta 30328 Tel 404 434 4000 TWX 810 766 4890 HAWAII 2875 So King Street Honolulu 96814 808 955 4455 ILLINOIS 5500 Howard Street Skokle 60076 Tel 312 677 0400 TWX 910 223 3613 St Joseph Tal 1217 469 2133 INDIANA 7301 North Shadeiand Ave Indianapolis 46250 Ye 317 842 1000 TWX 810 260 3796 IOWA 1902 Broadway lowa City 52240 Tel 319 338 9466 319 338 9457 KANSAS Derby 316 267 3655 LOUISIANA PO Box 840 3239 Wiliams Boulevard Kenner 70062 Tel 504 721 6201 TWX 810 955 5524 KENTUCKY Medical Caiculator Only 8003 Troutwood Court 40291 Tel 502 426 4341 MARYLAND 6707 Whitestone Road Baltimore 21207 301 944 5400 TWX 710 862 9157 4 Choke Cherry Road Rockville 20850 Tel 301 848 6370 TWX 710 828 9685 710 828 0487 PO Box 1648 2 Choke Cherry Road Rockville 20850 301 948 6370 TWX 710 828 9684 MASSACHUSETTS 32 Hartweil Ave Lexington 02173 Tel 617 861 8960 TWX 710 326 6904 MICHIGAN 23855 Research Drive Farmingion 48024 Tel 014 ee 0400 TWX 810 242 2900 MINNESOTA 2400 N Pror Ave Roseville 55113 Tel 6
25. 4 to 15 75V outputs of the Model 633150 proceed as follows a Connect test setup as shown in Figure 5 4 Each load resistor 87 is twice the normal full load resistance b Turn on the supply and close the line switch on the repetitive load switch POWER SUPPLY UNDER TEST OSCILLOSCOPE CONTACT PROTECTION RT NETWORK NOTE3 NOTE 4 NOTES THIS DRAWING SHOWS A SUGGESTED METHOD OF BUILDING A LOAD SWITCH HOWE VER OTHER METHODS COULD BE USED SUCH AS A TRANSISTOR SWITCHING NETWORK MAXIMUM LOAD RATINGS OF LOAD SWITCH ARE 5AMPS 500V 250W 2500 USE MERCURY RELAY CLARE TYPE HGP 1002 OR WE TYPE 2768 SELECT CONTACT PRO TECTION NETWORK ACCORDING TO MERCURY RELAY MANUFACTURERS INSTRUCTIONS EACH Ry 15 EQUAL TO TWICE THE NORMAL FULL LOAD RESISTANCE 2 xRl USED IN PREVIOUS TESTS LINE SWITCH REPETITIVE LOAD SWITCH NOTE 1 Figure 5 4 Load Transient Recovery Time Test Setup 5 4 c Adjust the oscilloscope to display the loading and the unloading transients produced by the operation of the load switch Recovery to within 196 of the nominal output voltage should occur within 25 microseconds as shown in Figure 5 5 5 25 5 Volt Output The mercury wetted relays recom mended for use in the repetitive load switch described in Figure 5 4 have a maximum current limitation of 5 amps For this reason some other type of repetitive load switch with a higher current capacity is re
26. 65 4A6 9170 0894 inductor toroidal 2 winding 5080 1808 power NPN Si see note page 6 7 1854 0563 SS PNP Si 2N2907A 1853 0281 power NPN Si see not page 6 7 1854 0563 SS PNP Si 2N2907A 1853 0281 silicon controlled rectifier 2N4441 1884 0082 SS PNP Si 2N2907A 1853 0281 fxd comp 6 8 596 1 2W EB 68G5 0698 5525 fxd comp 39 5 1 2W EB 3905 0686 3905 fxd comp 10K 5 1 2W EB 1035 0686 1035 fxd comp 56 5 1 2W EB 5605 0686 5605 fxd comp 18K 5 1 2W EB 1835 0686 1835 fxd ww 0 39 10 SW 0811 3416 fxd comp 100 5 1 2W EB 51G5 0686 1015 DH A N il 6 5 Table 6 3 Replaceable Parts MFR DESCRIPTION PART NO CODE HP PART B var trmr 2K 72XR2K 2100 3273 fxd comp 2 2K 596 1 2W EB 2225 0686 2225 var trmr 2K 72XR2K 2100 3273 fxd film 1K 196 1 8W CEA 993 0757 0280 fxd film 2K 196 1 8W CEA 993 0757 0283 fxd comp 1K 596 1 2W EB 1025 0686 1025 fxd comp 18 596 1 2W EB 1805 0686 1805 fxd comp 22 596 1 2W EB 2205 0686 2205 fxd ww 220 596 2W BWH 0811 1763 fxd comp 6 8 596 1 2W EB 68G5 0698 5525 fxd comp 10K 5 1 2W EB 1035 0686 1035 fxd comp 56 5 1 2W EB 5605 0686 5605 fxd comp 18K 596 1 2W EB 1835 0686 1835 fxd ww 0 39 10 5W 0811 3416 var trmr 2K 72XR2K 2100 3273 fxd comp 100 596 1 2W EB 51G5 0686 1015 fxd comp 5 6K 596 1 2W EB 5625 0686 5625 fxd comp 270 5 1 2W EB 2715 0686 2715 fxd film 3 83K 196 1 8W 1 0698 3153 fxd comp 3 3K 5 1 2W EB 3325 0686 3325 fxd comp 270 5
27. 71 TWX 910 443 2446 WEST VIRGINIA Medicai Analytical Charleston 304 345 1640 WISCONSIN 9431 W Beto Road Sule 117 Milwaukee 53227 Tel 414 541 0550 FOR U S AREAS NOT LISTED Contact the regional office nearest you Allanta Georgia North Hollywood Cahlornia Rockville 4 Choke Cherry Rd Maryland Skokie lihnols Their complete addresses are listed above Service Only CANADA ALBERTA Hewlett Packard Canada Ltd 11748 Kingsway Ave Edmonton 156 0x5 Te 403 452 3670 TWX 610 831 2431 Hewlett Packard Canada Ltd 915 42 Avenue S E Suite 102 Calgary 126 121 1403 287 1672 BRITISH COLUMBIA Hewlett Packard Canada Ltd 837 E Cordova Street Vancouver 382 604 254 0531 TWX 610 922 5058 MANITOBA Hewietl Packard Canada Ltd 513 Century St St James Winnipeg R3H 018 Tel 204 786 7581 TWX 610 671 3531 CENTRAL AND SOUTH AMERICA ARGENTINA Hewiett Packard Argentina SACE tavalle 1171 3 Piso Buenos Akes 16 35 0436 35 0627 35 0341 Telex 012 1009 Cable HEWPACK ARG BOLIVIA Stambuk Mark Boliwia Lida Av Mariscat Santa Cruz 1342 La Paz 40626 53163 52421 Telex 3560014 Cable BUKMAR BRAZIL Hewlett Packard Do Brasil Ltda Rua Frei Caneca 1 152 Bela Visla 01307 Sao Paulo SP Tet 288 71 31 287 81 20 287 61 93 Telex 309151 2 3 Cable HEWPACK 530 Pawo Hewlett Packard Do Brasi Ltda Praca Dom Feliciano 78 8 andar Sal
28. A SV OUTPUT 25 v VN pr y Li SHUTDOERN ACTURM CONSPANF TASE COM ara Teer B ma i P d Matar 164 1 x RST 5 Law au amp m on T Gy a Eiby SHU FROM gt AAL 4 sno Figure 7 1 Sheet 2 A2 Board OVERVOL T d ISV CKT 15V OUTPUTS P O 15 REGULATOR P O OVERVOLTASE PROTECTOR 2157 OUTPUTS 1 15V REGULATOR Component Locations A3 Board TO SHEET 2 FROM SHEET azpi 15 DUAL LINEAR REGULATOR ASSEMBLY E 5V SHUTDOWN RETURN 1 OVERVOLTAOE SHUTOOWN AUT 2 6 02 cn 40v IIV REGULATOR REGULATOR Re 16K T 180 M A INS E amp 16525 Rie dga aw d 2 Ti ag tt nes Ho PROTECTION CIRCUIT Ore OUTPUTS 200v R38 18 2 55 b amp S
29. E TO 4 AtQl Q2 CR3 CR4 REINSTALL AIUT IN SOCKET AND CHECK CORRECT DC VOLTAGE FROM TP3 TO TPI CHECK WAVEFORM FROM TO TP9 AND COMPARE TO A ON PAGE 7 2 VOLTAGE CHECK CRIO i 14 TVDCL FH U2 T2 WAVEFORM OF AICRB AND CORRECT AICRIO AND CHECK CIRCUITS CHECK DC VOLTAGE FROM TP1 TO TP CHECK AJLI 81 5 CHECK AIQ3 04 VOLTAGE CHECK Ut CRS CR UI 46 2N0C4 5 CHECK DC VOLTAGE FROM TP TO TP5 FOR SHORTS REMOVE AIUI FROM ITS SOCKET ISOLA PIN 11 AND REIN SERT AIU RECHECK FOR 4 7 VDC FROM TP TO TPS REPLACE NO CHECK FOR SHORTED AIVR2 C9 02 011 Figure 5 7 A1 Board Troubleshooting Procedure 5 9 DISASSEMBLE UNIT SEE PARA 5 40 WHILE TROUBLE SHOOTING THE 2 BO IT MUST BE CON NECTED TO PROP ERLY OPERATING At BOARO APPLY RATED INPUT VOLTAGE AND TEST A1 BOARD BY CHECK ING VOLTAGE FROM TO 2 5 TO At BD VOLTAGE ROCEED 4100 t BVOC gt HECK WAVEFORM FROM AITP I 70 AITP6 AND COMPARE TO ON PAGE 7 2 LIFT ONE END OF A2R3 CONNECT SCOPE FROM A2TPI TO 2 19 APPLY INPUT POWER AND WATCH FOR 20kHz PULSES CHECK CONTINUITY et OF TRANSFORMER A212 IF 6000 RE TURN TO AE SWITCH ING REGULATOR OHM METER CHECKS TABLE 5 3 CONTINUOUS TRAIN OF 3045 PULSES DISABLE OVERVOLT AGE CIRCUIT BY LIFTING ONE ENO OF A2VR2 MEASURE DC VOLTAGE FROM TO TERM INALS ON 782
30. EN SENSE COMMON RETURN Figure 7 1 Sheet 3 A3 Board HEWLETT hp PACKARD SALES amp SERVICE OFFICES UNITED STATES ALABAMA 8290 Whitesburg Dr S E PO Box 4207 Huntsville 35802 Tel 205 881 4591 TWX 830 726 2204 Medical Only 228 W Valley Ave Room 302 Birmingham 35208 Tel 205 879 2081 2 ARIZONA 2336 Magnolia St Phoenix 85034 Tei 602 244 1361 TWX 910 953 1331 2424 East Aragon Rd Tucson 85705 Tel 602 889 4661 ARKANSAS Medical Sernice Only Little Rock 72205 Tel 501 664 8773 CALIFORNIA 1430 East Orangethorpe Ave Fullerton 92631 Tei 714 870 1000 TWX 910 592 1288 3939 Lankershim Boulevard North Hollywood 91604 213 877 1282 TWX 910 499 2170 6305 Place Los Angeles 90045 Tel 213 649 2511 TWX 910 328 6147 Los Angeles Tel 213 776 7500 3003 Scott Boulevard Senta Clara 95050 408 249 7000 TWX 910 338 0518 Ridgecrest Tel 714 446 6165 2220 Watt Ave Sacramento 95825 916 482 1463 TWX 910 367 2092 S606 Aero Drive PO Box 23333 San Diego 92123 Tei 1714 279 3200 TWX 910 335 2000 Calculators 601 Calilorma St San Francisco 94108 Tel 415 989 8470 COLORADO 5600 South Ulster Parkway Englewood 80110 Tel 303 771 3455 TWX 910 935 0705 CONNECTICUT 12 Lunar Onve New Haven 06525 203 389 6551 TWX 710 465 2029 FLORIDA Box 24210 2805 W Oakland Park Bivd Ft Lauderdale 3
31. ENERGIZED CIRCUITS TO GROUND THROUGH THE TEST SHOOTING 15 REQD INSTRUMENTS INPUT LEADS REGULATION 15 BAD PROCEED TO TABLE 5 2 DISCONNECT ALL LOADS CONNECT A3 BD TO AND 2 ASSY APPLY INPUT POWER ANO ADJUST 15 V 40 FOR POS SUPPLY QUTPUT OF 315V AT TURN CURRENT LIMIT ADJ A3R9 FULLY CLOCK WISE AND RECHECK VOLT AGE OF POSITIVE OUTPUT CHECK THE LOAD REG ULATION OF THE CHECK SETTING OF E I5V SUPPLY CURRENT SEE PARA 5 13 IF ADJUSTMENT REGULATION 15 BAD CHECK U2 PROCEED TO TABLE 5 2 LIFT ONE END OF AR32 AND RECHECK VOLTAGE OF POS OUTPUT POSITIVE SUPPLY WHEN EI ADS CHECK A3VRI VR2 03 07 RECONNECT IS ADJUSTED A3R32 AND VOLTAGE OF POS ITIVE OUTPUT CHECK FOR OPEN CHECK FOR SHORT 4301 02 ED A301 Q2 C7 SHORTED 2 OPEN RIJ OR DE C9 06 CRI R9 OR FECTIVE Ut DEFECTIVE CONNECT A3R32 TURN CURRENT LIMIT ADJ A3R23 FULLY CLOCKWISE 1 MAKE SURE THAT THE 15V SUPPLY 15 OPERATING PROPERLY BEFORE ATTEMPTING TO TROUBLESHOOT THE CHECK SETTING OF 715V SUPPLY CURRENT LIMIT ADJUSTMENT CHECK U2 OUTPUT LOW OR ZERO CHECK FOR SHORT CHECK FOR OPEN A304 Q5 U4 SHORT ED 24 45 08 ED CIO CIi CI6 CI DEFECTIVE U2 Crete CR2 R3 OR OE FESTIVE WZ Figure 5 9 A3 Board Troubleshooting Procedure 5 11 SECTION VI REPLACEABLE PARTS 6 1 INTRODUCTION 6 2 This
32. R7 R8 R11 Poor regulation a Check remote sensing connections b Check the settings of current limit controls A2R34 9 and A3R23 Check change in preregulator dc output A1TP1 to TP12 as the supply is loaded Troubleshoot preregulator if voltage change exceeds 6Vdc d Check bias voltages A2TP1 to TP2 12 to 16Vdc A2TP1 to 8 to 10Vdc Check reference voltages A2TP13 to TP20 6 8 to 7 5Vdc and COMMON RETURN on TB3 to A3TP8 6 8 to 7 5Vdc f Check regulator IC s A2U4 A3U1 A3U2 and pulse width modulator A2U1 Table 5 3 Switching Regulator Resistance Checks All resistance readings taken on A1 board with A2 board disconnected One silicon junction drop equals about 0 7 volts dc Negative Lead Positive Lead Normal Indication Probable Cause of Abnormal Indication Q8 emitter TP8 Q5 base Q5 shorted Q5 collector open Q5 shorted U3 pin 4 one drop 1650 U3 shorted Q7 open OB collector drop 6000 O8 shorted base two drops CR16 17 O8 shorted Q10 base gt 09 010 shorted CR21 CR21 defective 010 collector gt 5kQ Q10 CR19 shorted CR20 cathode CR20 shorted 07 collector Q6 Q7 shorted 1 VR3 VR3 or VR4 defective 5 7 07 emitter Table 5 3 Switching Regulator Resistance Checks Continued Negative Lead Positive Lead Normal Indication Probable Cause of A
33. REVERSE VOLTAGE PROTECTION Output s are protected from damage due to the application of a reverse polarity voltage REMOTE SHUTDOWN A contact closure or TTL low input between the 5V output s or SEN terminal and terminal E6 reduces all supply outputs to zero volts The outputs return to normal on opening the contact or switching to a high logic level REMOTE SENSING Remote sensing terminals are provided which will correct for a load lead voltage drop of up to 596 while maintaining nominal voltage at the load The load is protected if sensing leads are inadvertently opened DIMENSIONS Refer to Figure 2 1 or 2 2 WEIGHT Net Shipping Model 63005C 3 2kg 7 Ibs 4 1kg 9 Ibs Model 633150 4 1kg 9 Ibs 5 0kg 11 Ibs SECTION II INSTALLATION 2 1 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 if found a claim should be filed with the carrier immediately Also a Hewlett Packard Sales and Service office should be notified 2 3 Mechanical Check 2 4 This check should confirm that there are no broken connectors and that the panel surfaces are free of dents and scratches 2 5 Electrical Check 2 6 The instrument should be checked against its elec trical sp
34. RN terminals and monitor the output voltage across the SEN and RETURN SENSE terminals g Check the 11 4 to 15 75V output by using the procedure described in steps a through e above Load the COMMON RETURN and terminals and monitor the output voltage across the RETURN SENSE and SEN terminals Do not readjust the output voltage the voltage of the negative supply should be within 296 of the positive supply s voltage 5 13 Load Effect Load Regulation Definition The change in the static value of dc output voltage resulting from a change in load resistance from open circuit to a value which yields maxi mum rated output current or vice versa 5 14 To test the load effect a Connect a full load resistance and a digital voltmeter across the and terminals of the 5V output as shown n Figure 5 2 b Turn on the supply and record the voltage across the 5V output s sensing terminals c Disconnect the load resistor and the DVM indication It should be within 0 1 of the reading in step c d Repeat steps a through c for each of the remain ing supply outputs 5 15 Source Effect Line Regulation Definition The change A in the static value of dc output voltage resulting from a change in input voltage over the specified range from low line to high line or from high line to low line 5 16 To test the source effect a Connect a variable autotransfo
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36. URRENT Figure 3 5 Load Sharing Tradeoff Mode 63315D 3 22 Current Limiting 3 23 The current limiting characteristics of these supplies are shown in Figures 3 6 and 3 7 The current limit circuits in these supplies provide foldback limiting which reduces the output current as the voltage decreases This results in a short circuit current that is less than the maximum available at the rated output voltage The circuits are self restoring and return the output voltage to normal when the overload is removed Figures 3 6 and 3 7 show the approximate factory settings and adjustment ranges for the current limiting circuits Changing the setting of the control affects the maximum output current as shown but has no effect on the short circuit current Procedures for adjusting the operating points of the current limit circuits are given in paragraph 5 46 3 24 When adjusting the current limit ensure that the new set point is at least 2096 above the expected operating current Operating the supply too close to the current limit set point may degrade performance 3 25 Since in the dual outputs of the Model 63315D the voltage of the slave negative supply depends on that of the master positive supply the occurance of current limiting in the master supply reduces the voltage of both outputs If a single load is connected across both outputs as shown in Figures 3 2 and 3 4 the initial current limit point is determined by the current
37. V 11 9 Tef 416 6 8 9430 TWX 619 492 4246 PANAMA Electr nico Balboa 5 A 4929 Calle Samuef Lewis Cuidad de Panama Je 64 2700 Telex 3431103 Curunda Zowe ELECTRON Panama PARAGUAY Z3 Melamed SR L Omisian Aparatos y Equipos Medicos Division Aparatos y Equipos Scentificos y de investigaci n Box 676 Cre 482 Victona Asunci n 4 5069 4 6272 Cable RAMEL QUEBEC Hewlett Packard Canada Ltd 275 Hymus Pointe H9R 107 Tel 514 697 4232 TWX 610 422 3022 TEX 05 821521 HPCL PERU Compa a Electro 5 Ave Enrique Canaval 312 San isidro Casilla 1030 Lima Tet 22 3900 Cable ELMED Lima PUERTO RICO San Juan Electronics inc Box 5167 Ponce de Le n 154 3 PTA Tierra San Juan 00906 Tei 804 725 3342 722 3342 SATRONICS San Juan SATRON 3450 332 URUGUAY Pablo Ferrando 5 A Comercial e Ingustrar Avenida 2877 Casilla de Correo 370 Montevideo 40 3102 RADIUM Montevideo Hewlett Packard Canada Ltd 2376 Galvani Street Ste Foy GIN 464 Tel 418 688 8710 FOR CANADIAN AREAS NOT LISTED Contact Hewlett Packard Canada Ltd in Mississauga VENEZUELA Packard de Venezuela A Apariado 50933 Edificio Segre Tercera Transversal Los Ruices Norte Caracas 107 Tet 35 00 11 21146 HEWPACK Cabie HEWPACK Caracas FOR AREA
38. VOID SHORTING AC LINE ENERGIZED CIR CUITS TO GROUND THROUGH THE TEST INSTRUMENTS INPUT LEADS EXERCISE EXTREME CAUTION WHEN WORKING ON ENERGIZED CIRCUITS A PREREGULATOR In In IS 15 PRERE TEST PONTS G BIAS AIQ TO AiG INPUT ov A 10V PROGRAMMABLE UNIJUNCTION ANODE arG Ar O M 1 t0 7V xt 1 1 NHJIUNCTION CATHODE 7 TO AU QD ov aov 1 scr 100v BRIDGE 7 9 OUTPUT 80V be 6 3mS 83ms SCHEMATIC NOTES 1 THE MODEL 63005 IS COMPLETE ON SHEETS AND 2 OF THE SCHEMATIC THE MODEL 633150 18 COVERED BY SHEET THRU 3 ALL COMPONENTS ARE MOUNTED ON RC BOARDS EXCEPT FOR ONE CHASSIS MOUNTED INDUCTOR A4Li DENOTES CONSTANT VOLTAGE FEEDBACK PATH ALL RESISTORS ARE IN OHMS 5 1 2W UNLESS OTHERWISE INDICATED ALL RESISTORS ARE J UNLESS OTHERWISE INDICATED ALL CAPACITORS ARE IN MICROFARADS THE SQUARE PLATED PADS ON THE PC BOARDS JNDICATE ONE OF THE FOLLOWING A PIN OF AN OR TRANSFORMER B THE POSITIVE END OF POLARIZED CAPACITOR C THE CATHODE OF DIODE OR EMITTER OF A TRANSISTOR TO OPERATE WITH AN 87 27 INPUT CONNECT JUMPERS FROM EI 2 AND FROM E4 AND 5 ON TB FOR 180 TO 250 OPERATION JUMPER FROM E3 TO E4 ONLY A CONTACT CLOSURE OR TTL CONTROL SIGNAL BETWEEN TERMINALS 6
39. WITCHING REGULATOR CLOCK SHUTDOWN SWITCH L C FILTER Component Locations A1 Board AC DC CONVERTER ASSEMBLY z a we PREREGULATOR BRIDGE LC FILTER 2O KH SWITCHING REGULATOR wi a e t 29 lee Qum avi i 1 4 E Ra ex fo WARMING A SOME CIRCUITS IN THIS INSTRUMENT i SAE CONNECTED DIRECTLY ME INPUT AC POWER LINE EXERCISE EXTREME CAUTION WHEN WORKING ON ENERGIZED CIRCUITS 1 Over FROM i f MEN SHEET W ia VOLTAGE CONTROL RETURN 1 j 1007 Le d SENSING en i i l 1 3 0 SHUTDOWN N MODEL E3350 5 vA common V n Figure 7 1 Sheet 1 A1 Board P O TURN ON VOLTAGE COMPARAT P O CONSTANT VOLTAGE COMPARATOR TION CKT Component Locations 2 Board 7 actu C KA VES TERI ol ise is me CIRCUITS th THIS ARE COANE TED OIRECTUY 10 THE PUT AC POWER QUE ERE CSE CATIA WE ee D Cra cuts CONTROL FIAS REGULATOR PULSE WIRTH MODULATOR Au Ov 18v dc DOWN MOTE 32 EN PROTEC T
40. a 806 8 S000 P rto Alegre RS Tel 25 84 70 000 0512 Cable HEWPACK Parte Alegre Hewlett Packard 90 Brasat JEC Rua Suena Campos 53 4 andar Copacabana 2000 de Janeiro GB 257 80 94 000 1021 Telex 2100 79 HEWPACK Cable HEWPACK Rio de Janeiro CHILE Caicagni y Metcalte Ltda Calle Lira 81 Oficina 5 Casilla 2118 Santiago 398513 Cable CALMET COLOMBIA instrumentaci n Henrik A Langebaek amp Kier S A Carrera 7 48 59 Apartado 6287 Bogota 1 OF Tel 45 78 06 45 55 46 Cabie AARIS Bogota Telex 44400INSTCO COSTA RICA Cienfilica Costarricense 5 Apettado 10159 San Jos 21 85 13 Cable GALGUR San Jos GUATEMALA IPESA Avenida Le Relorma 3 48 Zona 9 Guatemala Tei 53627 64786 Telex 4192 TELTRO GU NOVA SCOTIA Hewlett Packard Canada Ltd 800 Windmill Road Dartmouth B3C 111 Te 802 469 7820 Hewlett Packard Mexicana SA deCv Torres 21 Co del Valle Mexico 12 DF Tel 805 542 42 32 Telex 017 74 507 Hewlett Packard Mexicana S A ge C V Ave Consutuc n 2184 Monterrey Te 48 71 32 48 71 84 NICARAGUA Ter n G Apartado Postat 589 Edificio teran Managu Tei 3451 3452 Cable ROTERAN Manaqua Piso ONTARIO Hewlett Packard Canada Lid 1785 Woodward Or Ottawa K2C 0 9 Tel 613 225 6530 TWX 610 562 8968 Hewletl Packatd Canada Ltd 6877 Goreway Drive Mississauga La
41. an be detached from the A2 A3 assembly by pulling straight apart to unplug the pins at the top of A2T2 from A1J1 h To separate the A2 and A3 boards remove the two screws at opposite corners 5 42 Reassembly 5 43 To reassemble the unit after repairs have been completed reverse the above disassembly steps Before reassembling the A1 and A2 boards to the main heatsink clean the mating surfaces and both sides of the sheet of insulating material that goes between them and apply a coat ing of silicone grease HP Part No 6040 0265 or Dow Corning 340 to these surfaces CAUTION After reassembly and before reconnecting input power to the supply perform a high pot insulation test between primary and case primary and out put s and output s and case Test voltages are specified in Table 1 1 5 6 5 44 Replacing Power Semiconductors 5 45 Replace heatsink mounted power transistors and diodes by removing their mounting screws and unsoldering their pins Use mica insulators under A201 A2U2 A301 and A304 but do not use one under 105 The mica insulator for 201 is supplied with the replacement device When replacing power semiconductors coat the heat trans fer surfaces with silicone grease NOTE When replacing any wirewound power resistors of 3W rating or greater allow 1 4 inch clearance between the resis tor and the circuit board 5 46 ADJUSTMENTS NOTE Before adjusting an outpu
42. bnormal Indication CR13 cathode CR 13 anode three drops Note 2 CR 13 defective CR14 cathode CR15 anode two drops CR14 or CR15 defective CR11 anode one drop CR11 defective CR12 cathode CR12 anode CR 12 defective Q5 collector CR 14 cathode one drop CR22 defective CR18 anode one drop CR 18 defective base one drop Q5 open Q6 emitter one drop Q6 open Q8 base Q8 emitter one drop Q8 open 08 collector one drop Q8 open Q9 base Q9 emitter one drop Q9 open Q10 emitter one drop 010 open Q10 collector one drop Q10 open Notes 1 Nota silicon junction Do not apply more than 7 volts in testing 2 May appear open on low ohmmeter range Requires minimum of 3 volts to test 5 8 DISASSEMBLE UNIT SEE PARA 5 40 DISCONNECT THE At WA BD FROM THE A2 RNING AND A3 BDS WHILE SOME CIRCUITS IN THIS INSTRUMENT ARE CONNECTED PERFORMING THESE DIRECTLY To THE INPUT AC POWER UNE EXERCISE EXTREME CAUTION WHEN WORKING ON ENERGIZED SSIS MOUNTED CIRCUITS ALSO ENERGIZE THE SUPPLY THROUGH AN WIRED TO THE Ai BO ISOLATION TRANSFORMER TO AVOD SHORTING AC LINE ENERGIZED CIRCUITS TO GROUND THROUGH THE TEST INSTRUMENTS INPUT LEADS HECK FOR SHORTED RVI CRI 4 01 02 C2 C3 C13 05 APPLY RATED INPU VOLTAGE CHECK DC VOLTAGE FROM TO TP2 15 REMOVE AIU FROM VOLTAGE SOCKET RECHECK 100 6VDC DC VOLTAGE FROM CHECK WAVEFORM FROM TP TO TPS CHECK FOR SHORTED AND COMPAR
43. ceed and both the A1 and 2 boards must be operating properly before trouble shooting the A3 board Follow all steps in the order in which they are given 5 37 Board Troubleshooting 5 38 While checking the A3 Board for troubles it must be connected to A1 and A2 boards that are operating properly In addition problems in the positive 15 volt supply must be corrected before it is possible to trouble shoot the negative slave supply The troubleshooting procedure for the A3 board is given in Figure 5 9 5 5 5 39 REPAIR AND REPLACEMENT 5 40 Disassembly 5 41 Follow the steps below to disassemble the unit for troubleshooting and repair a Before removing the cover remove the plastic barrier block cover and disconnect all input and output connections b Remove six screws at the bottom edge of the cover and two at the top Then it can be slid off the supply c Detach the finned heatsink by removing its four screws d Remove the two spacer rods from the top of the circuit boards e Remove one screw from the bottom of the unit that attaches the A3 board to the chassis in the Model 63315D f Now removing the four or six flat head screws that were exposed by the removal of the heatsink and the three screws along the bottom edge of the A1 board will permit all boards to be detached from the chassis as a single assembly Three A4L 1 leads and one ground wire still connect the A1 board to the chassis g The A1 board c
44. d by a TTL digital input signal Use the or SEN term inal of the 5V output as the common input and apply TTL logic levels to terminal E6 A low logic level shuts down the supply a high logic level input resotres the outputs 3 31 Parallel Operation 3 32 The 5V outputs of two Model 63005C supplies can be operated in parallel Set the output of one supply to the desired voltage and set the other supply for a slightly higher voltage The supply set to the lower output voltage will act as a constant voltage source while the supply set to the higher output will act as a current limited source drop ping its output voltage until it equals that of the other supply The constant voltage source will deliver only that fraction of its total rated output current which is necessary to fulfil the total current demand 3 33 Series Operation 3 34 Either the or the 11 4 to 15 75V outputs of two or more supplies can be connected in series to obtain a higher voltage than is available from a single supply The restriction against operating these supplies with their out puts at a potential greater than 42 volts above ground limits the number which can be connected in series 3 35 Notice that series operation creates the possibility of a reverse voltage being applied across the output terminals of a deenergized supply that is in series with an energized one If this occurs the resulting reverse current flows through A2U4 in the 5V
45. d and the supply s mounted to a heat conducting surface they may be mounted in any position 2 14 Input Power Requirements 2 15 The Models 63005C and 63315D may be operated from an 87 to 127Vac or a 180 to 250Vac single phase 48 to 63Hz power source and can be adapted for either of these input voltage ranges by the positioning of jumpers on termi nals E1 through E5 on TB1 For 87 to 127V operation jumper E1 to E2 and E4 to 5 For 180 to 250V operation jumper E3 to E4 only When it is shipped the supply s input jumpers are connected for 87 to 127Vac operation Both models draw a maximum input current of 4 amps The maximum input power is 190 watts for the Model 63005C and 220 watts for the Model 63315D BLOCK COVER 29 Y ees 23 Amm 185799 076 095 __ _ 900 1 24mm 229mm T ER 448 4 126mm T 0 66 2 63 16 rel 87521 MOUNTING FASTENERS 6 324 PLACES BOTTOM THE FOUR 6 32 FASTENERS EXPOSED Ph REMOVAL OF THE HEATSINK MAY BE USED iH MOUNTING THE SUPPLY TO SUITABLE HE AT CONDUCTING SURFACE BUT THEY DO NOJ PROVIOE ADEQUATE 6 32 SCREW O38 CTR STRUCTUAL SUPPORT TO THE SUPPLY IF USED ALONE Figure 2 1 Outline Diagram Model 63005C 2 16 REPACKAGING FOR SHIPMENT 2 17 To insure safe shipment of the instrument it is recommended that the package designe
46. d for the instrument be used The original packaging material is reusable If 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 office to which the instru ment can be shipped and provide the Authorized Return label necessary to expedite the handling of your instrument return Be sure to attach tag to the instrument which specifies the owner model number full serial number and BARRIER BLOCK DETAIL service required or a brief description of the trouble g Your Oba fuu TIT P 6 32 4 PLACES im WOTE THE FOUR 6 32 FASTENERS EXPOSED BY REMOVAL OF THE HEATSINK MAY USED 1H MOUNTING THE SUPRLY SUITABLE HEAT CONDUCTING 5 duse SURFACE BUT THEY DO NOT PROVIDE ADEQUATE STRUCTURAL SUPPORT TO THE SUPPLY F USED ALONE Figure 2 2 Outline Diagram Model 63315D 2 2 SECTION III OPERATING INSTRUCTIONS 3 1 TURN ON CHECKOUT PROCEDURE 3 2 The following checkout procedure serves as a brief check that the supply is operational This procedure or the more detailed performance test of paragraph 5 6 should be followed when the instrument is received and before it is connected to any load equipment PREPARATION a Before connecting input power check that jumpers on terminals E1 through of TB1 are connected priately for the ac supply vol
47. d to the SCR gates by pulse transformer A1T1 f the 100V out put tends to increase the comparator amplifier reduces the conduction angle of the SCRs If the voltage tends to decrease the conduction angle is increased The reset switch discharges the timing capacitor in the firing circuit at the end of each half cycte of the ac line input 4 8 The supply is designed for two ac line voltage ranges 87 to 127Vac and 180 to 250Vac and can easily be converted from one to the other by changing jumper positions on terminals E1 through 5 on an external terminal block 4 9 20kHz Switching Regulator The supply s 5V output is regulated by a single transistor switching regulator connected in series with the 100V output of the pre regula tor and the primary winding of power transformer A2T2 on the A2 board The 5V output is regulated by controlling the percentage of the time that switching transistor 105 conducts The transistor s switching rate is controlled by an timer in the 20kHz clock circuit The on time of the switching transistor is controlled by a pulse width modulator located on the A2 board 4 10 The clock establishes the basic timing cycle for the regulator by generating an alternating sequence of switching transistor turn on and turn off pulses which are conducted to the base of 105 through pulse transformer 1 2 The maximum duty cycle of the switching transistor is 6096 Each time that a turn on clock pulse switches
48. dequate wattage to draw full rated current from the 5V output b Connect a digital voltmeter across the SEN and SEN terminals of the 5V output observing correct polarity CURRENT SAMPLING TERMINALS EXTERNAL LOAD TO GROUNDED TERMINAL OF POWER SUPPLY TO UNGROUNDED TERMINAL OF POWER SUPPLY SAMPLING RESISTOR LOAD TERMINALS Figure 5 1 Current Sampling Resistor Connections DIGITAL VOLTMETER POWER SUPPLY UNDER TEST CURRENT SAMPLING RESISTOR SHUNT Figure 5 2 Rated Output Test Setup c Apply input power to the supply and with the load switch open set the voltage of the 5V output to any desired value within the adjustment range This output voltage can be used for all remaining 5V performance tests d Connect the voltmeter across the current sampling terminals of the current sampling resistor close the load switch and adjust RE until the voltmeter indicates a voltage drop corresponding to the 5V 5 maximum rated current e Reconnect the voltmeter across the SEN and SEN terminals of the 5V output and recheck its output voltage It should be within 0 1 of the value set in step c f Steps f and g apply only to the Model 63315D Use the same procedure described in steps a through e above to check the 11 4 to 15 75V output Connect a switch a load resistor of appropriate value and a current sampling resistor in series between the and the COMMON RETU
49. e 5V output and any one terminal of the dual out put may be grounded if desired either at the supply s ground terminal or at the load See paragraph 3 12 3 2 3 14 Figure 3 2 Single Load Local Sensing 3 9 To use the dual outputs to supply 22 8 to 31 5 volts to a single load use the strapping arrangement shown in Figure 3 2 Either the or output terminal may be grounded as required See paragraph 3 12 3 10 Each load should be connected to the proper sup ply output terminals using separate pairs of connecting wires This will minimize mutual coupling effects between loads and will retain full advantage of the low output impedance of the supply Each pair of connecting wires should be as short as possible should be of adequately heavy gage and should be twisted or shielded to reduce noise pickup If shield is used connect one end to the power supply ground terminal and leave the other end unconnected 3 11 If load considerations require that the output power distribution terminals be remotely located from the power supply then the power supply output terminals should be connected to the remote distribution terminals by a pair of twisted or shielded wires and each load separately con nected to the remote distribution terminals Remote sensing should be used under these circumstances See paragraph 3 14 3 12 Grounding 3 13 The 5V output can be used either as a positive or a negative supp
50. e pole double throw single pole single throw 7 small signal 7 slow blow tantulum titanium 7 volt variable wirewound Watt Table 6 3 Replaceable Parts MFR Lm DESCRIPTION MFR PART NO CODE HP PART NO ow 5522 70 75 AC DC Converter Assy not assigned fxd elect 500uF 150V Type 68D D40701 0180 1889 C4 fxd cer 01uF 100V TA 0150 0093 fxd elect 1uF 50V 150D105X0050A2 0180 0230 C6 fxd elect 20V 150D106X9020B2 0180 0374 fxd elect 22uF 15V 150D226X9015B2 0180 0228 C8 fxd cer QOTuF 1KV 7 102 21022526 0150 0050 9 fxd elect 10uF 20V 150D106X9020B2 0180 0374 C10 fxd mica 002 100V obd 0160 2301 C11 fxd cer O1uF 100V TA 0150 0093 C12 fxd mylar 0684F 200V 292P68392 0160 0166 C13 fxd elect 69uF 150V 0180 2607 C14 fxd mylar 0022uF 200V AE12C222KT 0160 0154 C15 fxd elect 180uF 40V 0180 2606 CR1 2 diode si 600V 750mA SR1358 10 1901 0029 CR3 4 diode si 400V 1 5A SR1846 12 1901 0418 CR5 10 diode si 80V 200mA FDH 6308 1901 0050 CR11 diode si 100V 1A 1N4934 1901 0693 CR12 diode si 400V 750 SR1358 9 1901 0028 CR13 diode stabistor 150mA 15V STB523 1901 0460 CR14 17 diode si 80V 200mA FDH 6308 1901 0050 CR18 diode si 400V 750mA 581358 8 1901 0028 CR19 diode si 80V 200mA FDH 6308 1901 0050 CR20 diode si 100V 1A 1N4934 1901 0693 CR21 diode si 400V 750mA SR1358 9 1901 0028 CR22 diode si 100ns 400V 1A 1N4936 1 1901 1065 F1 fuse normal
51. ecifications Section V includes an in cabinet performance check to verify proper instrument operation 2 7 INSTALLATION DATA 2 8 The instrument is shipped ready for permanent installation or bench operation It is necessary only to connect the instrument to a source of power and it is ready for operation 2 9 Location and Cooling 2 10 This instrument is air cooled Sufficient space should be allotted so that a free flow of cooling air can reach the instrument when it is in operation At least 1 2 inch clearance at the bottom of the unit is recommended to permit proper air flow The supply should be used in an area where the ambient temperature does not exceed 40 C If operated at an ambient greater than 40 C the supply s output current must be linearly derated down to 5096 at 70 C 2 11 It is also possible to cool this supply through con duction by removing its finned heatsink and mounting the rear surface of the supply to a suitable heat conducting surface Consult the factory for specific recommendations 2 12 Mounting Orientation 2 13 Figures 2 1 and 2 2 show outline and dimension information As shown in these figures four mounting holes are provided on the bottom of the supply and four more are available at the rear if the heat sink is removed If these sup plies are cooled by natural convection the upright position is the only orientation recommended f they are cooled by forced air or if the heatsink is remove
52. ithin a 2 tolerance and a single voltage adjustment control A3R11 controls both outputs The constant voltage comparators regulate the outputs of the supply by controlling the conductance of series regu lator transistors A301 and A304 4 31 Output Current Limiting A current limit com parator for each regulator monitors the voltage drop across current sampling resistor R7 or R22 and compares it to an adjustable reference voltage across R9 or R23 that is derived from the regulator s output If the voltage drop across the current sampling resistor exceeds the reference voltage the comparator s output signal to the series regu lator causes the output voltage and current to be reduced This reduction in the output voltage reduces the current limit circuit s reference voltage to produce the foldback current limit characteristic shown in Figure 3 8 Because of the dual tracking interconnection between the positive and negative supplies the output voltages of both are reduced if the positive output is overloaded 4 32 Overvoltage Protection To protect loads on the 15V outputs against overvoltage an overvoltage protection comparator monitors each output and fires an SCR connect ed across the 15V outputs if either exceeds the preset trip level of 16 to 18 volts When SCR fires it shorts the 15V outputs and simultaneously sends an overvoltage trip pulse through A2T1 to the clock shutdown switch on the A1 board to shut down the cl
53. k 5 1 4W fxd comp 430 596 1 4W fxd ww 3 596 3W fxd ww 1 5 5 3W fxd comp 10k 596 1 4W fxd ww 0 1 10 3W fxd film 30 1 1 1 8W fxd film 5 17k 1 1 8W fxd film 243 1 1 4W fxd film 5 11k 1 1 8W fxd ww 1 5 5 3W fxd ww 3k 5 3W fxd comp 10 5 1 4W varistor metal oxide switch thermal opens at 110 C transformer pulse preregulator transformer pulse clock IC thyristor transistor array IC linear timer photo isolator filter RFI diode zener 6 19V diode zener 14 7V diode zener 75V diode zener 150V 5V Switching Regulator Assy fxd elect 47uF 25V fxd elect 2 2uF 20V fxd cer 0 1K F 50V fxd mylar 022uF 200V fxd elect 2000uF 10V fxd elect 2 2uF 20V fxd elect 22uF 15V fxd elect 4 7uF 35V nN l c 6 3 CB 1025 CB 1035 55 1 1 1 MF4C 1 243E EB 1015 CB 1015 MF4C 1 4 1 CB 1015 CB 4705 EB 1805 CB 8215 EB 1805 CB 1025 CB 4315 242 E 7 16 A 54 F CB 1035 K46505 1 1 MF52C 1 1 7 16 A 54 F VAL 3 CB 1005 CA3097E NE555T IL 1 F1798 CD35646 CD35754 5211213 392 5211213 440 672D476H025CC5B 150D225X0020A2 5C50B1 CML AE17C223KT 150D225X0020A2 150D226X901582 150D475X9035B2 0683 1025 0683 1035 91637 0698 6076 0757 0465 0698 3226 56289 0812 0050 0686 1015 0683 1015 0698 3153 0757 0447 0683 1015 0683 4705 0686 1805 0683 8215 0686 18
54. load increases The current limit characteristics of the output are shown in Figure 3 6 or 3 7 To obtain these current limit characteristics the output current limit comparator compares the voltage developed across current sampling resistor R24 to a reference voltage developed across R20 When the voltage across R24 exceeds this reference the output of the com parator reduces the dc level input to the pulse width modulator to reduce the supply s output The resulting reduction in output voltage decreases the contribution made to the reference voltage across R20 by current from the positive output line through R34 and R18 This reduces the output current limiting point as the output voltage decreases If the output is short circuited the circuit reduces the output current to the value determined by the reference voltage developed by the current through R17 alone For this reason output current limit adjust R34 affects the maximum output current while leaving the short circuit current fixed 4 26 Remote Shutdown contact closure or TTL in put signal applied between remote shutdown terminal EG and either the negative output or the negative sensing terminal of the 5V supply reduces all outputs of the supply to zero This input signal shuts down the outputs by lower ing the dc level input to the pulse width modulator The outputs of the supply return to normal on removal of the remote shutdown input signal 4 27 Overvoltage Protecti
55. lso energize the supply through an iso lation transformer to avoid shorting ac line energized circuits to ground through the test instrument s input leads Figure 5 6 Circuit Board Isolation Procedure 5 33 A1 Board Troubleshooting CAUTION 5 34 To troubleshoot the A1 board it must be discon nected from the A2 and A3 boards Complete the disassem bly procedure given in paragraph 5 40 and then proceed to Before applying power to the supply make certain A1 Board Troubleshooting Figure 5 7 that jumpers E1 through E5 on are connected appropriately for the ac line voltage to be used 5 35 A2 Board Troubleshooting loads should be disconnected while trouble shooting If checks must be made that require loading the supply while the circuit boards are detached from the main heatsink restrict the time the output is loaded to avoid overheating 5 36 While checking the A2 board for troubles it must be connected to a properly operating A1 board Detach the board if present from the 2 board and plug the 1 and A2 boards together Then proceed to A2 Board Troubleshooting Figure 5 8 5 31 If a malfunction occurs that causes an output voltage to be high low or zero proceed to the circuit board isolation procedure of Figure 5 6 This procedure identifies the board on which troubleshooting must begin The A1 board must be operating properly before trouble shooting of the A2 board can pro
56. ly by grounding one of its output terminals or one end of the load Ground at only one point in the setup and always use two wires to connect the load to the supply This eliminates the possibility of load current return paths through the ac ground line which could open the chassis ground path and create a hazardous condition This supply can also be operated at up to 42 Vdc above ground if neither output bus is grounded Remote Sensing 3 15 Remote sensing is used to maintain good regulation at the load by reducing the degradation in regulation that would occur due to the voltage drop in the leads between the power supply and the load For reasonable load lead lengths remote sensing greatly improves the performance of the supply However if the load is located a consider able distance from the supply added precautions must be Observed to obtain satisfactory operation Because the voltage drop in the load leads subtracts directly from the available output voltage it is recommended that the total drop in both load leads not exceed 5 of the supply s nom inal output voltage 3 16 The leads from the sensing terminals to the load carry much less current than the load leads so these leads need not be as heavy as the load leads However they must be twisted or shielded to minimize noise pickup Figure 3 3 Load Connections Remote Sensing 3 17 Figure 3 3 shows the strapping arrangement for co
57. minal tab near R9 11 23 barrier block 6 term barrier block jumper Chassis Mechanical chassis Model 63005C chassis Model 63315D cover Model 63005C cover Model 63315D cover label Model 63005C cover label Model 63315D heatsink Model 63005C heatsink Model 63315D circuit board spacer rod Model 63005C circuit board spacer rod Model 63315D heat sink insulator plastic film barrier block cover Miscellaneous packing carton carton filler carton filler Model 63005C only floater pad MFR E DESCRIPTION MFR PART NO CODE HP PART NO m A3 Mechanical Model 63315D only transistor insulator molded Q1 Q4 transistor insulator mica O1 Q4 5020 2513 5020 2528 0590 0193 0340 0503 0340 0174 0380 0091 2190 0360 3050 0397 1251 4180 0360 0681 0360 0523 734 63315 20001 0340 0503 0340 0174 1205 0037 1251 4180 0360 0590 0360 0523 734 TXBF 019 0258 5000 3112 5000 3113 5000 3114 5000 3115 7120 4975 7120 4974 5020 2510 5020 2511 5020 2515 5020 2516 5020 2527 0360 0551 54 toco 9211 1175 9220 1421 9220 1422 9220 1423 NOTE Power transistors A301 and 4 have no direct commercial replacements For these transistors the Model 63315D uses RCA 2N3055 transistors that have been selected for the following characteristics hee 35 min to 90 max at le of 4A FE C BVcEO 75V min fr 500kHz at Ic of 40mA 6 7
58. nnecting loads to the supply using remote sensing When the loads on the dual outputs of a Model 63315D are loca ted a considerable distance from each other the COMMON RETURN load lead and the RETURN SENSE lead should be connected together at a remote sensing point that is equidistant from the two loads This ensures that the regulation characteristics of both outputs will be equal 3 18 Figure 3 4 shows the connections necessary for powering a single load from the dual output using remote sensing The SEN and SEN sensing leads should be connected as close as possible to the load Figure 3 4 Single Load Remote Sensing 3 3 3 19 Output Ratings 3 20 Model 63005C The Model 63005 is capable of providing 22 amps at 0 25V at ambient temperatures up to 40 Above 40 the output current must be linearly derated to 5096 at the maximum operating temper ature of 70 C 3 21 Model 63315D Individually the maximum output currents of the Model 63315D are 18 amps at the 5V 0 25V output and 2 amps at each of the 11 4 to 15 75V outputs These maximum currents are not available simultaneously though due to the 110W total output rating of the supply Figure 3 5 illustrates the load sharing tradeoff between the 5V and the 11 4 to 15 75V outputs Above 40 these output currents must be linearly derated to 5096 at the maximum operating temperature of 70 1114 TO 5 75V TOTAL OUTPUT C
59. ock Thus an overvoltage condition at any of the triple output supply s three outputs will shut down the entire supply SECTION V MAINTENANCE 5 1 INTRODUCTION 5 5 Table 5 1 l sts the test equipment required to per form the various procedures described in this section 5 2 Upon receipt of the power supply the performance test of paragraph 5 6 can be made This test is suitable for incoming inspection Section contains a quick but less comprehensive checkout procedure which can be used in 5 7 The following test can be used as an incoming lieu of the performance test if desired inspection check and appropriate portions of the test can be repeated to check the operation of the instrument after repairs The tests are performed using the specified nominal input voltage for the unit If the correct result is not obtained for a particular check proceed to troubleshooting paragraph 5 27 5 6 PERFORMANCE TEST 5 3 If a fault is detected in the power supply while making the performance test or during normal operation proceed to the troubleshooting procedure in paragraph 5 27 After troubleshooting and repair repeat the perfor mance test to ensure that the fault has been properly cor rected and that no other faults exist Before performing any maintenance check turn on the power supply and allow a half hour warm up CAUTION Before applying power to the supply make certain that jumpers E1 through 5
60. on An overvoltage protection circuit monitors the 5V output and fires SCR A201 if the voltage exceeds a preset trip level of 6 to 7 volts When A201 fires it immediately discharges the filter capacitors across the 5V output to reduce the output to less than 2 volts At the same time a current pulse from A2T1 fires the clock shutdown switch SCR on the A1 board to remove power from the clock and shut off 105 This reduces all output voltages to zero In order to restore the supply to operation its ac input must be removed for a minimum of 10 seconds and then reapplied 4 28 Dual Linear Regulator Assembly A3 Board Model 63315D only 4 29 Two series transistor regulators on the A3 board provide dual tracking outputs of 11 4 to 15 75 volts The input power to these regulators is obtained from two additional secondary windings of transformer 272 and is half wave rectified and filtered on the A3 board 4 30 Voltage Regulation The regulators for the positive and negative outputs are similar except that the one for the positive output compares its output voltage to that of a zener reference while the one for the negative output compares the voltage at the COMMON RETURN output terminal to the voltage at the junction of two equal resistors A3R27 A3R28 which are connected across the posi tive and negative outputs This is why the output voltage of the negative or slave supply matches that of the posi tive or master supply w
61. on TB1 are connected appropriately for the ac line voltage to be used 5 4 TEST EQUIPMENT REQUIRED Table 5 1 Test Equipment Required REQUIRED RECOMMENDED TYPE CHARACTERISTICS USE MODEL Digital Voltmeter Variable Voltage Transformer Oscilloscope Repetitive Load Sw Resistive Loads Current Sampling Resistor Shunt Sensitivity 100UV full scale min Input impedance 10 megohms min Range 90 130Vac Equipped with voltmeter accurate within 1 volt Sensitivity 5mV cm Bandwidth 20MHz min Differential input Rate 60Hz 2usec rise and fall time Tolerance 5 Accuracy 196 5 1 Measure DC voltages HP 3450A calibration procedures Vary AC input Display transient re HP 180A with 18214 sponse and ripple and and 1801A or 1803A noise waveforms plug ins Measure transient See Figure 5 4 response James G Biddle Lubri Tact Rheostat Power supply load resistor fixed resistor or rheostat Empro Shunt A 50 50 0 192 resistor HP No 0811 2061 Measure 5V output current Measure 15V output current 5 8 General Measurement Techniques 5 9 Connecting Measuring Devices To achieve valid results when measuring the load effect PARD ripple and noise and transient recovery time of the supply measuring devices must be connected across the supply s sensing ter minals If a measurement were made across the load it would include the impedance of the lead
62. ph 5 46 g Model 63315D only Check the operation of the current limit circuit for the positive 11 4 to 15 75V out put by the method described in f above but using a variable load resistor with an adjustment range of about 49 to 150 and a 50W power rating Repeat for the nega tive output To adjust the current limit settings see para graph 5 46 OVERVOLTAGE PROTECTION CHECKS h Because the supply s output voltage adjustment ranges are limited and the overvoltage trip circuits are not adjust able checking the overvoltage trip circuits requires the use of an external power supply The supply needed for check ing the overvoltage trip for the 5V output should be able to supply 5 to 7 Vdc at a current of at least 2 amps To avoid causing damage to the supply under test the external supply s maximum available current should be no more than 5 amps To check that the overvoltage trip circuit for the 5V output is operational energize the external supply and adjust its output to 7 volts Energize the 63005C or 63315D supply and then momentarily connect the output of the external supply across its 5V output terminals nega tive to negative and positive to positive After disconnecting the external supply check for the presence of voltage at the outputs of the supply under test All outputs should be at zero volts Deenergize the supply under test for 10 seconds and then restore power Check that all outputs have return ed to normal i
63. power TEMPERATURE COEFFICIENT Less than 01596 output voltage change per degree Celsius over the operating range from O to 40 at constant load and line voltage after 30 minutes warmup TEMPERATURE RANGES Operating 0 to 40 C ambient For temperatures greater than 407 C output current must be derated linearly to 50 1 2 of maximum at 70 C ambient Storage 55 C to 85 C COOLING Convection cooled In some applications can be con duction cooled through surface at end of case after removing finned heatsink Consult factory for recommendations THERMAL PROTECTION Heatsink mounted thermostat shuts off output s if sup ply overheats due to high ambient temperature Thermostat automatically resets when unit cools to safe operating temperature CURRENT LIMIT PROTECTION Accessible screwdriver adjustment s are factory set to limit load current to approximately 12096 5V output or 130 12 to 15V outputs of rated maximum current Foldback current limit characteristics are shown in Figures 3 6 and 3 7 Adjustment range is approximately 65 to 130 of rated load current in Model 63005C and 65 to 15096 in Model 63315D OVERVOLTAGE PROTECTION Non adjustable overvoltage crowbar reduces output s to less than 2V when trip level of 6 to 7V is exceeded at the 5V output or 16 to 18V is exceeded on either 12 to 15V output In the Model 63315D an overvoltage trip at any one output shuts down all three outputs
64. quired for testing the load transient recovery time of the 5V output The use of a solid state electrical load with pulse modulation capabilities such as the Transistor Devices Dynaload DLP 50 60 1000 is one way to avoid the rise time and switching noise limitations of mechanical switches at currents above 5 amps 5 26 To check the load transient recovery time of the 5V output proceed as follows a Connect test setup as shown in Figure 5 4 but in place of the load switch and contact protection network shown substitute a solid state repetitive load switch with a current capacity of at least half of the supply s rated out put and rise time of less than 100 microseconds Since the supply s recovery time is specified for a change between half and full load the switch conducts only hal f of the supply s rated output Each load resistor is twice the normal full load resistance b Turn on the supply and the load switch c Adjust the oscilloscope to display the loading and the unloading transients produced by the operation of the load switch Recovery to within 196 of the nominal output voltage should occur within 1 millisecond as shown in Figure 5 5 ms 5V OUTPUT 25ps 11 4V TO 15 75 OUTPUTS ims 5V OUT PUT 254us 11 4V TO 15 75V OUTPUTS 1 POSITIVE OUTPUT UNLOADING TRANSIENT NEGATIVE OUTPUT LOADING TRANSIENT LOADING TRANSIENT UNLOADING TRANSIENT
65. rmer between the input power source and the power supply ac input b Connect a full load resistance and a digital volt meter across the bV output of the supply c Adjust the autotransformer for a low line input d Turn on the power and record the DVM indication e Adjust the autotransformer for a high line input and recheck the DVM indication It should be within 02 of the reading in step d f Repeat steps b through e for each of the remaining supply outputs 5 17 PARD Ripple and Noise Definition The residual ac voltage which is super imposed on the dc output of a regulated power supply Ripple and noise may be specified and measured in terms of its rms or peak to peak value 5 18 Measurement Techniques Figure 5 3A shows an incorrect method of measuring p p ripple Note that a continuous ground loop exists from the third wire of the input power cord of the supply to the third wire of the input power cord of the oscilloscope via the grounded power supply case the wire between the negative output terminal of the power supply and the vertical input of the scope and the grounded scope case Any ground current circulating in this loop as a result of the difference in potential between the two ground points causes drop which is in series with the scope input This IR drop normally having a 60Hz line frequency fundamental plus any pickup on the unshielded leads interconnecting the power supply and scope
66. rough A1R37 during each pulse that A105 conducts and imme diately turns off A1Q5 if this current exceeds a preset level This current limit circuit on the primary side of the transformer serves as a backup to the protection provided by an adjustable output current limit circuit on the second ary side The primary peak current limit circuit has a higher set point than the one on the secondary side and functions solely to protect the switching transistor 4 14 The third turn off signal listed in paragraph 4 11 the clock turn off pulse limits the maximum on time of A1Q5 to 30 microseconds of each operating cycle to avoid transformer saturation 4 15 Between the time a turn off signal ends 105 conduction interval and the time the clock turn on pulse turns A105 on again the collapsing field of transformer A2T2 generates a current pulse in a flyback winding which CR18 conducts to return this energy to capacitor A1C13 at the input to the switching regulator This keeps the trans former core out of saturation by resetting it before the next operating cycle begins 4 16 The clock receives its 14 7V operating bias from a shunt zener regulator composed of R21 and VR2 An Tee sv to FLYBACK aisi 1 tt 1 i Eres 1 DOTPUT cur WPTR SWITCHING PETS REGULAT
67. s 34 OPERATION CAUTION Before applying power to the supply make certain that jumpers E through E5 on TB1 are connected appropriately for the ac line voltage to be used 3 5 The following paragraphs discuss the various opera ting modes and features of the Model 63005C and 63315D supplies Their 5V outputs can be used with local or remote voltage sensing The 11 4 to 15 75V outputs of a Model 63315D supply can be used as a dual output supplying posi tive and negative voltages or they can be connected to pro vide a single output providing 22 8 to 31 5 volts Local or remote sensing can be used with both the dual and single load connections The 5V outputs of two single output supplies can be connected in parallel and two or more of them can be connected in series 3 6 The DC Power Supply Handbook Application Note 90A contains a considerable amount of general information on using regulated dc power supplies effectively and is available at no charge from your local HP sales office 3 7 Connecting Loads 3 8 Figure 3 1 shows the strapping arrangement for connecting loads to the supply using local voltage sensing and supplying two separate loads from the 11 4 to 15 75V outputs The positive master supply powers Ria and the negative slave supply powers As the VOLT ADJ control for the dual outputs is adjusted the slave supply s output tracks that of the master within 2 Either termi nal of th
68. s to the load This impedance can easily be several orders of magnitude greater than the supply impedance and would thus invali date the measurement To avoid mutual coupling effects each measuring device must be connected directly to the supply s sensing terminals by separate pairs of wires 5 10 Output Current Measurements Accurate output current measurements can be made by inserting a low resis tance current sampling resistor in series with a load resistor of appropriate resistance and wattage Table 5 1 recom mendes two four terminal resistors suitable for use as current sampling resistors for the and 15V outputs Figure 5 1 shows a four terminal meter shunt The load current through a shunt must be fed to the extremes of the wire leading to the resistor while the sampling connections are made as close as possible to the resistance portion itself NOTE Output current limiting would interfere with accurate measurements of the supply 5 perfor mance Avoid current limiting by making certain that the current limit adjustments are set sufficiently above the rated output current 5 11 Rated Output 5 12 To check that the supply will furnish its rated out put voltage s and 5 proceed as follows a Connect in series across the and terminals of the 5V output a suitable load resistor a current sampling resistor and a switch as shown in Figure 5 2 The load resistor must be of the proper value and of a
69. supply or diodes A3CR1 or CR16 which protect the 15V outputs against reverse voltage CAUTION When operating these supplies in series turn them on and off simultaneously if possible If this cannot be done ensure that all units are turned on or off within 25 seconds to minimize the possibility of damage to the output diodes SECTION IV PRINCIPLES OF OPERATIQN 4 1 INTRODUCTION 4 2 This section presents the principles of operation for the Models 63005C and 63315D switching regulated modular power supplies The Model 63005C single output supply employs just two of the circuit boards shown in the simplified schematic of Figure 4 1 A1 and A2 The A1 board contains an SCR preregulator whose dc output is filtered to provide a regulated 100V dc input to a single transistor switching regulator On the A2 board the 20kHz output from a switching regulator transformer secondary is rectified and filtered to produce a regulated 5V dc output at a maximum current of 22 amps Also on the A2 board are the voltage control output current limit and over voltage protection circuits for the 5V output 4 3 In the Model 6331 5D A1 and A2 boards very similar to those in the Model 63005C produce a 5V output with a maximum current rating of 18 amps and an addition al A3 board contains a dual linear regulator which produces two tracking outputs with an output voltage range of 11 4 to 15 75 volts at a maximum current of 2 amps
70. t current limit the voltage of that output must be set to the desired value 5 47 To adjust the setting of one of the output current limit circuits proceed as follows a Before energizing the supply connect across the output an oscilloscope and a load resistor equal in value to the desired output voltage divided by the desired current limit For example to set the current limit of the 5V out put to 20 amps when the output s set for 5 20 volts a 260 milliohm 100 watt load resistor is required b Turn the current limit adjusting pot for the output being adjusted fully clockwise CW to its maximum setting c Energize the supply and monitor the output ripple while turning the current limit adjusting pot gradually counterclockwise CCW until the ripple begins to increase substantially Set the pot to the point where the increase in ripple begins Table 5 2 Ripple and Regulation Troubleshooting Symptom Probable Cause Excessive 120Hz ripple Check voltage and ripple at preregulator output 2 1 to TP2 Voltage should be 100 6 Ripple should not exceed 12V p p with the supply fully loaded Check A1C2 C7 Excessive 20kHz ripple or noise spikes Check al board mounting screws tightened securely and the following components 5V Output Check A2C3 C5 C6 C12 C13 C16 19 L1 L3 X 15V Outputs Check A3C1 C2 C8 C11 C16 18 C20 C21 L1 L2 L5 L6 Erratic output at some value of load current Check A2CR3
71. tage to be used See paragraph 2 16 b Connect all remote sensing terminals to the corres ponding output terminals as shown in Figure 3 1 c Connect unit to input power source using AC and ground terminals of TBT VOLTAGE CHECKS d Check the voltage of the 5V output between terminals and on TB2 and using a small screwdriver to turn the VOLT ADJ control set the output to the desired value with in its 4 75 to 5 25V range e Model 63315D only Check the voltages of the positive and negative 11 4 to 15 75V outputs by measuring from to COMMON RETURN and from COMMON RETURN to on TB3 They should differ from each other by no more than 296 Turn the VOLT ADJ control to set these outputs to the desired voltage CURRENT LIMIT CHECKS f To check the operation of the current limit circuit for the 5V output connect the test setup shown in Figure 5 2 to the output using a variable load resistor for RL that can be adjusted from about 0 15Q to about 0 522 The load resistor must be able to dissipate 110 watts Set Figure 3 1 Load Connections Local Sensing 3 1 Re to its maximum resistance and apply power to the sup ply Decrease the resistance of Ry gradually while ob serving the output current indicated by the DVM The current should increase to some maximum value which is the current limit setting and then begin to decrease To adjust the current limit setting see paragra
72. ual current restrictions of 18 amps 2 amps and 2 amps respectively and within these limits can be operated at any combination of currents that does not exceed the supply s 110W total output rating See Figure 3 5 for the load sharing tradeoff for the Model 63315D 1 3 Both models are SCR preregulated and use an ad vanced design 20kHz transistor switching regulator for their 5V outputs The 11 4 to 15 75V outputs of the Model 63315D have two independent linear transistor series regulators 1 4 Adjustable foldback current limit circuits protect all outputs against overload or short circuit damage by limiting the outputs to between 65 and 130 of their maximum ratings Fixed overvoltage protection crowbar circuits are activated at 6 to 7 volts on the 5V output and at 16 to 18 volts on the 11 4 to 15 75V outputs They reduce all outputs to less than 2 volts if any one output exceeds its trip voltage 1 5 The and 11 4 to 15 75V outputs are isolated from the chassis and from each other and may be grounded to the ground terminal provided or floated at up to 42 volts above ground 1 6 SPECIFICATIONS 1 7 Table 1 1 lists detailed specifications for these power supplies 1 8 Accessories 1 9 Accessories are available for mounting these sup plies in a standard 19 inch equipment rack Consult the factory for information INSTRUMENT AND MANUAL IDENTIFICATION 1 10 1 11 Hewlett Packard power supplies are identified by
73. ulator whose output is transmitted through the optically coupled isolator on the A1 board to the switching transistor 4 20 Voltage Regulation Each output pulse from the pulse width modulator causes switching transistor A105 in the switching regulator to stop conducting Thus the output voltage is regulated by controlling the duration of Q5 s conduction intervals The pulse width modulator controls the timing of its output pulses by comparing two input signals One of them is a dc level received from the output of the constant voltage comparator This signal varies depending on the difference between the supply s output voltage and that of a fixed reference An increase in the supply s output voltage changes this dc level in the negative direction The pulse width modulator compares this dc level to a combined dc and ripple signal taken from the output of the first section of the LC filter 4 2 When the clock on the A1 board turns A105 on the positive voltage at the secondary of transformer A2T2 begins charging A2C5 through inductor A2L1 The pos itive going ramp voltage waveform on these capacitors and the dc level from the constant voltage comparator are both attenuated and applied to two inputs of a comparator within the pulse width modulator The pulse width modulator s output pulse to the isolator is produced each time the dc plus ripple voltage input from 2 5 exceeds the dc level input from the constant voltage com 4 3
74. within the specified input voltage rating Table 1 1 Specifications Models 63005C and 63315D Continued OUTPUT Model 63005C 5V 0 25V 22A Model 63315D 5V 0 25V 18A 11 4 to 15 75V 2A 11 4 to 15 75V 2A Screwdriver voltage adjustments are accessible through holes in the panel Maximum load currents cannot be obtained simultaneously See Figure 3 5 for load sharing tradeoff TRACKING ACCURACY Model 63315D dual output 2 Ripple and Noise outputs Less than rms 40mV p p 20Hz to 20 2 EMI CHARACTERISTICS Conducted complies with VDE 0875 7 71 Level N SAFETY STANDARDS Designed to conform to recommendations of IEC 348 Approved by UL for inclusion in their Recognized Com ponent Index under Guide 00202 File 51529 DIELECTRIC WITHSTAND VOLTAGE Primary to case 1500V rms for 1 minute Primary to output s 1500V rms for 1 minute Output s to case 500 for 1 minute INSULATION RESISTANCE At least 10 megohms from any output to case or from output to 12 to 15V outputs LOAD TRANSIENT RECOVERY Less than 1 0msec BV output or 25usec 12 to 15V outputs for output recovery to within 196 of nominal out put voltage following a load change from full to half load Or vice versa CARRYOVER TIME Output voltage remains within 296 of specified nominal for more than 20msec while delivering full load current following removal of ac input

Models 63005C and 63315D

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