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PL Series

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5. PL154 PCB ASSY MASTER PL330QMD 330QMT 44115 0590 Part Number 23379 2100 23427 0329 23427 0334 23557 0611 23557 0612 23557 0647 23557 0665 23557 0668 23620 0246 23620 0249 23620 0256 23620 9007 23685 0007 25021 0901 25061 9503 25341 0214 25380 0229 27106 0506 27153 0030 27161 0120 27164 0506 27226 0520 27231 2730 27234 5730 27250 2000 28502 0010 35555 2100 Description RES PS H 1K0 Cermet 10mm CAP 47PG 63V CER N150 P5 CAP 470PK 100V MED K P5 CAP 47U 10V ELEC RE2 P2 CAP 1U0 50V ELEC RE2 P2 CAP 10U 35V ELEC RE2 P2 CAP 2U2 50V ELEC RE2 P2 CAP 220U 10V ELEC RE2 P2 5 100NK 63V P E CAP 330NK 63V P E P5 CAP 1U0K 63V P E P5 CAP 10NK 100V P E P5 CAP 100NK 160V P P P10 DIO 1N4148 B R DISPLAY 4 DIGIT LED TRAN PNP ZTX214L BC559 TRAN NPN BC549 IC LM324N IC ICL7109B V REF W DIO ZN404 2 45V IC ULN 2803A IC 4052B IC 74HC273 IC 74AC573 MCU8 PIC16C55XT P RESONATOR CER 4MHZ PCB MAIN PL 44115 0700 continued Position VR6 C15 17 C36 C7 C18 39 C25 26 38 C16 C37 C2 6 9 12 27 28 29 C1 5 10 11 C3 C13 14 C4 D1 4 7 25 DISP1 2 Q6 Q8 IC7 IC2 D6 IC6 IC3 IC5 1 4 9 1 1 XL1 21 a PCB ASSY MAIN PL310 310QMD 310QMT b PCB ASSY MAIN PL320 320QMD 320QMT c PCB ASSY MAIN PL330 330QMD 330QMT UNIQUE PARTS d PCB ASSY MAIN PL154 e PCB ASSY MASTER PL330QMD 330QMT Part Number Description Position 23185 000
6. 35515 1220 35515 1310 24 Description HEADER 5 WAY STRAIGHT 156P HEADER 6 WAY STRAIGHT 156P RES ZERO OHM RES ZERO OHM RES 47RJ W25 CL RD25S RES 1ROF W60 MF 100PPM RES 0R47K W5 MF RES 1R 1 2W 10 CAP 1000U 63V ELEC RE2 P7 5 CAP 1000U 63V ELEC RE2 P7 5 CAP 1000U 63V ELEC RE2 P7 5 CAP 2200U 35V ELEC RE2 P7 5 100 160V P P MKP10 DIO 1N4003 DIO 1N5401 DIO 1N5401 PCB DRIVER PL PCB DRIVER PL Position PJ6 PJ7 R20 LK1 R56 R20 23 73 74 20 21 22 23 20 21 22 23 C31 32 C33 34 C30 33 34 40 C31 32 33 34 C30 D18 20 22 24 D16 D2 17 19 21 a b a a b c a b d PCB ASSY 5V 7A MAIN PL330QMT 44115 0650 Part Number 22573 0063 23185 0220 23185 0560 23185 1100 23185 2100 23185 2470 23185 3100 23185 3330 23185 3470 23185 4100 23185 4150 23185 4220 23187 4300 23187 4620 23202 2100 23202 2174 23202 2845 23202 3110 23202 3143 23202 3150 23202 3180 23202 3300 23202 3866 23202 4200 23202 4226 23202 5100 23347 0140 23377 2100 23379 2100 23379 2220 23427 9247 23557 0611 23557 0612 23557 0647 23557 0668 23620 0246 23620 0249 Description HEADER 16 WAY STR SIL 8 4MM RES 22RJ W25 CF RD25S B R RES 56RJ W25 CF RD25S B R RES 100RJ W25 CF RD25S B R RES 1K0J W25 CF RD25S B R RES 4K7J W25 CF RD25S B R RES 10KJ W25 CF RD25S B R RES 33KJ W25 CF RD25S B R RES 47KJ W25 CF RD25S B R RES 100KJ W25 CF RD25S B R RES 150KJ W25 CF RD25S B R RES 220KJ W25 CF RD
7. Input Voltage Input Voltage Range Power Consumption 30V 1A 15V 4A or 30V 2A 30V 3A Environmental Operating Range Environmental Storage Range Weight 30V 1A 15V 4A or 30V 2A 30V 3A Size Electrical Safety EMC Fixed 5 0 1 0 to 1 5 Amps 4mm terminals on 19mm 0 75 spacing Output will withstand up to 16V forward voltage Diode clamped for reverse voltages and up to 3 Amps reverse current lt 0 3 for 50 load change lt 0 1 for 10 line change Internally set for 110 120 220 or 240VAC 50 60Hz 10 of voltage setting Single Dual Triple 75 150 150 150 375VA 250VA 500 600VA 5 C to 40 C 20 to 80 RH 20 C to 60 C Single Dual Triple 4 0kg 8 0kg 8 5kg 5 0kg 9 5kg 11 5kg 6 0kg 12 0kg 15 5kg 155 mm wide x 170mm high x 265 300mm deep single 350mm wide x 170mm high x 265 300mm deep dual 425mm wide x 170mm high x 265 300 mm deep triple Designed and manufactured to comply with IEC 348 Designed and manufactured to comply with EN50081 1 EN50082 1 Installation Mains Operating Voltage Check that the operating voltage of the instrument shown on the rear panel is suitable for the local supply Should it be necessary to change the operating voltage range proceed as follows 1 Ensure that the instrument is disconnected from the AC supply 2 Remove the screws holding the case upper and handle 3 Lift off the case upper 4 The transformer primary taps are cle
8. and removes the drive to the pass transistors OPON also drives the multiplexer IC10 which switches to Vp when OPON is low Calibration 5V 7A Module Equipment Required 5 5 digit multimeter with better than 0 1 accuracy on voltage and better than 0 2 accuracy on current or use a precision current shunt Asmall switch 560 Ohm resistor and a diode Preparation Preset adjustments are located on both the main and driver pcbs Presets are accessible from both sides of the main pcb Take great care not to touch the mains connections on the transformers during adjustment Use an insulated trim tool Allow five minutes warm up before proceeding Calibration To avoid errors when making voltage measurements the DVM must be connected directly to the sense terminals Voltage Differential Gain Remove the link between O P and sense only and fit a diode cathode to sense and anode to O P Connect the small switch across the diode Connect the 560 Ohm resistor between O P and sense Connect the DVM set to 20V range to the sense terminals Close the switch Set the DC output switch ON Set the output voltage to approximately 5V Note the reading Open the switch and adjust on the main pcb for the same reading 0 5 Close and open the switch and check the reading Voltage Output and Meter Remove the switch and resistor and refit the link between O P and sense Set the voltage control to maximum and
9. current capability VR5 on the Master unit is disconnected from R47 and connected to a network generating twice the control voltage The slave unit becomes inoperative Series SW2 depressed The Slave unit positive terminal is connected to the Master unit negative terminal Tracking SW4 depressed As for Series but additionally R36 on the ve input to the Slave unit voltage control op amp IC7B is disconnected from IC7A and is instead connected to a potential divider connected between Master unit ve output and Slave unit ve output This maintains the voltageage at the Slave ve output and hence the Master ve output equal to gt of the total output voltage thus producing tracking supplies of 30V controlled from VR1 and VR2 on the Master unit VR1 and VR2 on the Slave unit become inoperative PL330QMD Master The main pcb on the master side on these instruments has some extra circuitry which allows current measurement above 4 amps and is only active when parallel mode is selected QMPAR going low 10 halves the reference input to the A to D and selects 02 to give the correct output voltage readings The current readings only read half and the microcontroller multiplies the answer by 2 before driving the display This results a resolution of 2 and 10mA which would be the case if a divide by 10 was used See calibration section for correct adjustment of VR10 and VR11 11 Calibration Main Outputs Equipment R
10. 23202 3150 23202 2174 23202 3110 23202 3143 23202 3453 23202 4200 23202 4360 23274 0045 23320 0003 23347 0140 23377 2100 23377 3100 23379 2220 23427 9247 23428 0470 23557 0612 23557 0647 23557 0664 23557 0667 23557 0677 23620 9007 25021 0901 25061 0200 25115 0907 Description Position RES 47RJ W25 CF RD25S B R R19 RES 100RJ W25 CF RD25S B R R15 RES 220RJ W25 CF RD25S B R R9 17 20 37 RES 470RJ W25 CF RD25S B R R5 RES 1K0J W25 CF RD25S B R R2 4 6 18 RES 1K5J W25 CF RD25S B R R33 RES 1K8J W25 CF RD25S B R R1 RES 2K2J W25 CF RD25S B R R27 RES 4K7J W25 CF RD25S B R R7 8 25 26 RES 10KJ W25 CF RD25S B R 13 16 28 30 38 RES 150KJ W25 CF RD25S B R R34 RES 1K00F W25 MF 50PPM R10 RES 15K0F W25 MF 50PPM R21 RES 1K74F W25 MF 50PPM R12 RES 11K0F W25 MF 50PPM R3 RES 14K3F W25 MF 50PPM R22 RES 45K3F W25 MF 50PPM R14 RES 200KF W25 MF 50PPM R23 24 36 RES 360KF W25 MF 50PPM R35 RES 100RJ 2W5 WW R11 31 RES R10 FERRYALLOY R32 POT 10K LIN VO12L PV25F B10K VR1 3 RES PS H 1K0 CF 10MM VR4 RES PS H 10K CF 10MM VR2 RES PS H 2K2 Cermet 10mm skel VR5 CAP 330PG 100V CER N750 P2 5T C11 CAP 47PG 100V CER N150 P2 5T C12 CAP 1U0 50V ELEC RE2 P2 C8 CAP 10U 35V ELEC RE2 P2 C6 7 CAP 1000U 35V ELEC RE2 P5 C4 CAP 220U 25V ELEC RE2 P3 5 C5 9 CAP 4700U 25V ELEC RAD P7 5 C1 2 3 10NK 100V P E P5 C23 14 DIO 1N4148 B R D1 2 3 5 6 7 LED T1 ROUND 3mm RED LED1 DIO 1N4002 B R 011 12 13 14 29 ASSY 5V PL320Q
11. 25115 0907 25117 0020 25130 0231 25130 0903 25130 0913 25341 0214 25383 0505 25386 9300 25801 9501 Description RES 330RJ W25 CF RD25S B R RES 470RJ W25 CF RD25S B R RES 1K0J W25 CF RD25S B R RES 1K5J W25 CF RD25S B R RES 1K8J W25 CF RD25S B R RES 2K2J W25 CF RD25S B R RES 4K7J W25 CF RD25S B R RES 10KJ W25 CF RD25S B R RES 47KJ W25 CF RD25S B R RES 6K2J W25 CF RD25S B R RES 5K10F W25 MF RES 43K0F W25 MF RES 100RJ 2W5 WW RES 0R05J 10W WW ALUM HSD RES PS H 1KO CF 10MM RES PS H 2K2 CF 10MM RES PS H 100R Cermet 10mm skel CAP 47PG 100V CER N150 P2 5T CAP 1LI0 50V ELEC RE2 P2 CAP 10U 35V ELEC RE2 P2 CAP 1000U 35V ELEC RE2 P5 CAP 220U 25V ELEC RE2 P3 5 CAP 4700U 25V ELEC RAD P7 5 CAP 100NK 63V P E P5 CAP 10NK 100V P E P5 DIO 1N4148 B R DIO 1N4002 B R DIO 1N5401 DIO ZEN 8V2 W4 DIO ZEN 5V1 W4 DIO ZEN 6V8 W4 TRAN PNP 21 2141 559 TRAN NPN BC338 TRAN TIP31A Thyristor TAG 666 100 Position R52 R59 R18 58 R56 R20 R24 R39 40 41 R45 70 R43 44 46 69 R53 R68 R67 R57 60 R62 VR8 VR3 VR5 17 19 16 23 24 21 20 22 30 31 32 33 34 18 36 12 D4 D12 13 14 15 D6 D10 D11 D7 Q5 6 Q3 7 Q2 SCR1 27 PCB ASSY 5V 7A DRIVER PL330QMT 44115 0660 continued Part No 27106 0513 27160 0009 27230 0530 35515 1350 Description IC LM358N IC VIREG 7805 TO220 IC 74HC4053 PCB DRIVER PL 5V 7A PCB ASSY 5V PL310QMT 44115 0670 Part Number 2003
12. current mode Isolated True parallel Series or Series Tracking via front panel switches Isolates the output and permits voltage and current limits to be set up before connecting the load 4mm terminals on 19mm 75 spacing Typically lt 6mOhm at 1kHz Typically 50kOhm with voltage limit at maximum Up to maximum output voltage 20 Volts forward diode clamped for reverse voltages and up to 3A reverse current lt 0 01 of maximum output for 90 load change lt 0 01 of maximum output for 10 line voltage change Eliminates up to 0 5V drop per lead Typically lt 1mV rms lt 20usec to within 50mV of setting for 90 load change Typically lt 100 Dual 3 75 digit 4095 count with 12 5mm 0 5 LEDS Reading rate 4 per second 10mV over the entire range 1mA over the entire range 0 1 of reading 0 3 of reading Nominally 20ms switchable to 2 sec for averaging of rapidly varying loads Logic Output PL330 QMT Output Voltage Range Output Current Output Switch Output Terminals Over Voltage Protection Output Protection Load Regulation Line Regulation Remote Sense Ripple and Noise Transient Response Temperature Coefficient Meter Type Meter Resolution Voltage Current Meter Accuracy Logic Output PL320 QMT Output Voltage Range Output Current Output Switch Output Terminals Over Voltage Protection Output Protection Load Regulation Line Regulation Remote Sens
13. multiplexer is controlled by IC1 The decision on what to measure and display at any time is taken by the microcontroller and in order to do this correctly a number of status signals and switches are monitored on a regular basis These are ILIMIT true if in current limit OPON the output on off switch signal These signals may be read by the microcontroller as required Service Notes On Issue 3 and earlier main pcbs the current damping was provided by a digital filter in the microcontroller program and R65 and C38 were not fitted Also if jitter is experienced on the meters near full scale this can be overcome by increasing C1 to 330n If the integrator capacitor C4 has high dielectric absorption this will cause non zeroing of the current meter this can be overcome by simply replacing it even with the same type as the yield is very good On later pcbs more space has been provided to allow the larger pitch polypropylene type to be used Poor regulation can be caused by incorrect adjustment of the differential gain or the output is oscillating Quad Mode Dual Switchbank Assembly The Quad Mode Dual units have a bank of four switches which allow four modes of operation to be obtained Isolated SW 1 Release depressed All interconnections between the two units is removed Parallel SW2 depressed The Slave unit pass transistors are driven from Q1 on the Master PCB and their output is combined with that of the Master unit thus doubling its
14. 0 PCB ASSY DRIVER PL154 Part Number 20037 0301 20210 0101 20234 0011 20611 0003 20613 0006 20670 0180 22573 0210 23179 3100 23185 0000 23185 0470 23185 1100 23185 1470 23185 2100 23557 0647 23557 0664 23557 0667 25115 0907 25130 0231 25130 0903 25382 0610 25383 0505 27160 0009 Description WASHER SHK PROOF ZPST NUT M3 ZPST SCREW M3 X 10 PNHDPZ NPST BUSH POLYESTER T0220 J22 5006 WASHER SIL PAD TO220 HEATSINK PCB MTG 63MM HIGH HEADER 10 WAY STRAIGHT 156P RES 10KJ W5 CF RES ZERO OHM RES 47RJ W25 CF RD25S B R RES 100RJ W25 CF RD25S B R RES 470RJ W25 CF RD25S B R RES 1K0J W25 RD25S CAP 10U 35V ELEC RE2 P2 CAP 1000U 35V ELEC RE2 P5 CAP 220U 25V ELEC RE2 P3 5 DIO 1N4002 B R DIO ZEN 8V2 W4 DIO ZEN 5V1 W4 TRAN NPN DARLINGTON TIP120 TRAN NPN BC338 IC V REG 7805 TO220 44115 0710 Position FOR IC8 amp Q1 FOR IC8 amp Q1 FOR IC8 amp Q1 FOR IC8 amp Q1 FOR IC8 amp Q1 FOR IC8 amp Q1 R57 LK2 R19 R50 R59 R58 23 24 21 22 08 12 13 14 15 010 D11 Q1 Q7 IC8 23 a PCB ASSY DRIVER PL310 310QMD 310QMT UNIQUE PARTS b PCB ASSY DRIVER PL320 320QMD 320QMT L c PCB ASSY DRIVER PL330 330QMD 330QMT d PCB ASSY DRIVER PL154 Part Number 22573 0205 22573 0206 23185 0000 23185 0000 23185 0470 23206 0010 23215 9302 23215 9303 23557 0654 23557 0654 23557 0654 23557 0669 23685 0008 25115 9001 25117 0020 25117 0020
15. 0 23185 0470 23185 1220 26 Description CAP 1U0K 63V P E P5 CAP 10NK 100V P E P5 CAP 100NK 160V P P MKP4 P10 DIO 1N4148 B R DISPLAY 4 DIGIT LED TRAN NPN BC549 IC LM358N ICL7109B V REF W DIO ZN404 2 45V IC ULN 2003A 74HC4053 IC 74HC273 IC 74AC573 IC MCU8 PIC16C55XT P RESONATOR CER 4MHZ PCB MAIN PL 5V 7A CONN ASSY DRIVER PL 5V 7A Description PAD P E S AD 12 X 15MM WASHER M3 ZPST WASHER M3 Spring NUT M3 ZPST SCREW M3 X 10 PNHDPZ NPST BUSH POLYESTER T0220 J22 5006 WASHER SIL PAD TO220 HEATSINK PCB MTG 50MM HIGH FUSEHOLDER PCB MOUNTING FUSE 6 3A 20MM FB GLASS HEADER 3 WAY STRAIGHT 156P HEADER 5 WAY STRAIGHT 156P HEADER 7 WAY STRAIGHT 156P HEADER 20 WAY 2X10 STR SKELTN RES ZERO OHM RES 47RJ W25 CF RD25S B R RES 220RJ W25 CF RD25S B R Position C3 13 14 C4 D1 2 3 5 DISP1 Q1 4 IC7 IC2 09 IC3 IC6 IC5 4 XL1 PJ1 Position FOR R62 FOR IC8 Q2 FOR IC8 Q2 FOR IC8 Q2 FOR IC8 Q2 FOR IC8 FOR IC8 HS1 FOR FS1 FS1 PJ4 PJ6 PJ3 PJ5 LK1 9 R19 R21 23 47 63 ASSY 5V 7A DRIVER PL330QMT 44115 0660 continued Part No 23185 1330 23185 1470 23185 2100 23185 2150 23185 2180 23185 2220 23185 2470 23185 3100 23185 3470 23187 2620 23202 2510 23202 3430 23274 0045 23286 0020 23377 2100 23377 2220 23379 1100 23428 0470 23557 0612 23557 0647 23557 0664 23557 0667 23557 0677 23620 0246 23620 9007 25021 0901
16. 0 0263 20038 9501 20210 0101 20234 0012 20670 0200 22573 0202 23185 2100 23424 0463 23557 0658 23557 9122 25115 0907 25117 0020 27160 0450 35515 1360 Description WASHER M3 ZPST WASHER M3 Spring NUT M3 ZPST SCREW M3 X 8 PNHDPZ ZPST HEATSINK PCB MTG 50MM HIGH HEADER 2 WAY STRAIGHT 156P RES 1K0J W25 CF RD25S B R CAP 10NZ 1KV CER P5 CAP 100U 25V ELEC RE2 P2 5 CAP 4700U 16V ELEC RE2 P7 5 DIO 1N4002 B R DIO 1N5401 IC VIREG L4940V5 T0220 PCB 5V PL310QMT ASSY 5V PL320QMT 44115 0680 PartNumber 20030 0263 20038 9501 20210 0101 20234 0011 20611 0003 20613 0006 20670 0130 22300 0211 22316 0201 22454 0041 22573 0203 22573 0205 23185 0000 28 Description WASHER ZPST FOR 5 1 WASHER 3 Spring FOR SK1 NUT M3 ZPST FOR SK1 SCREW X 10 PNHDPZ NPST FOR 5 1 BUSH POLYESTER T0220 FOR SK1 WASHER SIL PAD 0220 FOR SK1 HEATSINK MTG 25MM HIGH 5 1 FUSEHOLDER PCB MOUNTING FOR FS1 FUSE FB LBC 20MM GLASS FS1 RECEPT RED FVDDF1 25 250 2 HEADER 3 WAY STRAIGHT 156P PJ1 2 HEADER 5 WAY STRAIGHT 156P PJ3 RES ZERO OHM LINKS 9 Position IC9 IC8 1 10 Position FOR IC1 FOR FOR IC1 FOR IC1 FOR IC1 R1 C4 C3 C1 2 D5 D1 2 3 4 6 IC1 Position ASSY 5V PL320QMT 44115 0680 continued Part No 23185 0470 23185 1100 23185 1220 23185 1470 23185 2100 23185 2150 23185 2180 23185 2220 23185 2470 23185 3100 23185 4150 23202 2100
17. 0 0801 PL320QMT CASE PARTS 51000 1301 PL330QMT CASE PARTS 51000 0901 Part Number 20037 0247 20062 9303 20062 9305 20062 9501 20630 9001 20630 9003 20653 0204 20657 0070 20657 0072 20662 9101 33536 3510 33536 3500 33536 3620 33536 3630 33536 3660 37113 0180 37522 0160 Position LOWER CASE SCREWS COVER FRONT PANEL Description WASHER 4BA SHK PROOF I T ZPST SCREW NO 6 X 0 5 PNHDPZ ST AB SCREW No 6x3 4 Pozi Pan FEET SCREW No 6x3 4 Raised Poz HANDLE Black Handle Handle Clips CABLE TIE KNOB 21MM DA217 180 GREY 99 CAP BLK LINE C211 GREY 99 Instrument Foot COVER PL310QMD 310QMT 320QMD COVER PL330QMD COVER PL310 320 154 COVER PL330 COVER PL330QMT 320QMT BUTTON MID GREY ABS LABEL SER NO THURLBY THANDAR i INSTRUCTION BOOK Part Number 48511 0170 Description INSTRUCTION BOOK PL SERIES i MAINS CABLES Part Number 10175 0110 22491 0200 22491 0210 36 Description Type MAINS LD 3 CORE 24 0 2MM 240V MAINS LD BARE ENDS EURO PLUG 220V MAINS LD BARE ENDS USA PLUG 110 120V iii FUSES MODEL 240 220V 110 120V PL310 320 154 Single 22315 9501 22315 9502 PL330 Single 22315 0230 22315 0241 PL310QMD QMT PL320QMD QMT 22315 9502 22315 9503 PL330QMD 22315 0241 22315 0244 PL330QMT 22315 9503 22315 0245 iv POWER WARNING LABELS MODEL 240 220V 110 120V PL310 320 154 Single 37559 0100 0110 37559 0130 0120 PL330 Single 375
18. 0 RES ZERO OHM LK1 3 4 5 a b c d 23185 1100 RES 100RJ W25CF RD25S B R R53 23185 1150 RES 150RJ W25CF RD25S B R R53 23185 4470 RES 470KJ W25CF RD25S B R R29 a b c e 23185 5180 RES1M8J W25CF RD25S B R R29 d 23202 3100 RES 10KOF W25 MF 50PPM R30 a b c 23202 3300 RES W25 50PPM R4 a b c d 23202 3820 RES 8K20F W25 MF 50PPM R30 d 23202 3220 RES 22K0F W25 MF 50PPM R47 a 23202 3105 RES 10K5F W25 MF 50PPM R47 b 23202 2680 RES 6K08F W25 MF 50PPM R47 23202 2536 RES 5K36F W25 MF 50PPM R47 d 23202 2715 RES 7K15F W25 MF 50PPM R55 e 23202 3100 RES 10K0F W25 MF 50PPM R30 23202 3154 RES 15K4F W25 MF 50PPM R27 23202 3470 RES 47F0F W25 MF 50PPM R4 e 23202 4205 RES 205KF W25 MF 50PPM R71 23202 4226 RES 226KF W25 MF 50PPM R27 a b c d 23206 2220 RES2K2F W60 MF 50PPM MRS25 R49 23207 2100 RES 1K00F 1W MF 250PPM R49 c 23286 0010 RES 0R1J 10W WW ALUMINIUM R51 a b c d 23286 0030 RES 0R1J 15W WW ALUMINIUM R51 23377 1470 RES PS H 470R CF 10MM VR4 d 23377 2100 RES PS H1K0 CF 10MM VR4 9 b c e 23377 2100 RES PS H1K0 CF 10MM VR9 d 23377 2220 RES PS H2K2 CF 10MM VR4 9 a 23379 2220 RES PS H2K2 CERMET 10MM VR11 e 23379 2470 RES PS H4K7 CERMET 10MM VR10 e 23557 0610 CAP 100U 50V ELEC RE2 P3 5 C20 c 23557 0666 CAP 47U 63V ELEC RE2 P3 5 20 22 PCB ASSY DRIVER PL310 310QMD 310QMT 44115 0450 PCB ASSY DRIVER PL320 320QMD 320QMT 44115 0410 COMMON PARTS PCB ASSY DRIVER PL330 330QMD 330QMT 44115 061
19. 0010 RES 1ROF W60 MF 100PPM MRS25 R1A 1D 2A 2D b 23206 0010 RES 1ROF W60 MF 100PPM MRS25 R1A 1F 2A 2F C 23377 1470 RES PS H 470R CF 10MM VR2 b c 23377 2100 RES PS H 1 CF 10MM VR2 a HEATSINK ASSY PL310 310QMD 310QMT 46115 0450 HEATSINK ASSY PL320 154 320QMD 320QMT 46115 0440 HEATSINK ASSY PL330 330QMD 330QMT 46115 0470 COMMON PARTS HEATSINK ASSY 5V 7A 46115 0510 HEATSINK ASSY PL 5V 4A 46115 0500 Part Number Description Position 10232 0306 SLEEVE H50 X 20MML BROWN 20030 0240 WASHER 4 ZPST 20038 9503 WASHER M3 5 SPRING 20100 9201 NUT 4BA Full Steel 20134 9007 SCREW 4BA x 1 2 Pozi Pan 20611 0007 TRANSISTOR MOUNT T03 20613 0014 WASHER SIL PAD TO3 22451 0200 SOLDER TAG 4BA 25386 9201 TRAN 2N3055 a HEATSINK ASSY PL310 310QMD 310QMT UNIQUE PARTS b HEATSINK ASSY PL320 154 320QMD 320QMT c HEATSINK ASSY PL330 330QMD 330QMT d HEATSINK ASSY 5V 7A _ e HEATSINK ASSY PL 5V 4A Part Number Description 20670 0250 HEATSINK 11DN01250C2SX d e 20670 9001 HEATSINK KP314 a b c 22575 0203 SKT 3W 156 20AWG Yellow IDT e 22575 0205 SKT 5W 156 20AWG Yellow IDT d 22575 0206 SKT 6W 156 20AWG Yellow IDT a b 22575 0208 SKT 8W 156 20AWG Yellow IDT C 23274 0060 RES 0R22K 4W WW KH206 044 d 31 FRONT PANEL ASSY PL310 320 330 154 FRONT PANEL ASSY PL310QMD 320QMD 330QMD 46115 0490 FRONT PANEL ASSY PL310QMT FRONT PANEL ASSY PL320QMT FRONT PANEL ASSY PL330QMT Pa
20. 23202 3150 23202 3180 23202 3560 23202 4200 23202 5100 23284 0060 23347 0140 23347 0150 23377 2470 23377 4100 23379 1100 20 Description PAD P E S AD 12 X 15MM SWITCH PUSH PUSH SPPH11060A HEADER 16 WAY STR SIL 8 4MM HEADER 5 WAY STRAIGHT 156P HEADER 10 WAY STRAIGHT 156P RES 22RJ W25 CF RD25S B R RES 27RJ W25 CF RD25S B R RES 470RJ W25 CF RD25S B R RES 1160 W25 RD25S B R RES 1K8J W25 CF RD25S B R RES 4 7 W25 CF RD25S B R RES 10KJ W25 RD25S B R RES 33KJ W25 RD25S B R RES 47KJ W25 RD25S B R RES 100KJ W25 CF RD25S B R RES 220KJ W25 CF RD25S B R RES 10 W25 CL RD25S RES 330RF W25 MF 50PPM RES 1K05F W25 MF 50PPM RES 8K45F W25 MF 50PPM RES 14K3F W25 MF 50PPM RES 15K0F W25 MF 50PPM RES 18K0F W25 MF 50PPM RES 56K0F W25 MF 50PPM RES 200KF W25 MF 50PPM RES 1M00F W25 MF 50PPM RES 2K2J 2W5 WW POT 10K LIN VO12L PV25F B10K POT 10K LOG VO12L PV25F 15A10K RES PS H 4K7 CF 10MM RES PS H 100K CF 10MM RES PS H 100R Cermet 10mm 44115 0700 Position FOR R51 DAMPING FOR DISPLAYS PJ3 PJ1 R5 R10 17 INC R42 R43 R18 R1 34 40 41 64 69 R25 33 45 46 R9 66 67 R2 3 75 R6 24 62 65 70 R7 8 39 R26 44 R52 R48 R54 R37 R32 36 R28 R31 R35 38 R55 R60 61 VR1 2 VR5 VR3 VR8 VR7 PCB ASSY MAIN PL310 310QMD 310QMT 44115 0440 PCB ASSY MAIN PL320 320QMD 320QMT 44115 0400 PCB ASSY MAIN PL330 330QMD 330QMT 44115 0600 COMMON PARTS PCB ASSY MAIN
21. 25S B R RES 300KJ W25 CF RD25S B R RES 620KJ W25 CF RD25S B R RES 1K00F W25 MF 50PPM RES 1K74F W25 MF 50PPM RES 8K45F W25 MF 50PPM RES 11 W25 RES 14K3F W25 RES 15K0F W25 MF 50PPM RES 18K0F W25 MF 50PPM RES 30K0F W25 MF 50PPM RES 86K6F W25 MF 50PPM RES 200KF W25 MF 50PPM RES 226KF W25 MF 50PPM RES 1M00F W25 MF 50PPM POT 10K LIN VO12L PV25F B10K RES PS H 1K0 CF 10MM RES PS H 1K0 Cermet 10mm skel RES PS H 2K2 Cermet 10mm skel CAP 330PG 100V CER N150 P2 5T CAP 47U 10V ELEC RE2 P2 CAP 1U0 50V ELEC RE2 P2 CAP 10U 35V ELEC RE2 P2 CAP 220U 10V ELEC RE2 P2 5 CAP 100NK 63V P E P5 CAP 330NK 63V P E P5 Position FOR DISPLAY R64 R10 11 12 13 14 15 16 17 R48 R28 R27 34 42 R22 26 66 R5 6 7 R1 2 3 R65 R49 R8 9 R50 R51 R32 R33 R54 R31 R37 R36 R30 R4 R61 R35 38 R29 R55 VR1 2 VR4 VR6 VR7 C15 C7 8 C11 C25 26 C37 C2 6 27 28 29 38 C1 5 9 10 25 PCB ASSY 5V 7A MAIN PL330QMT 44115 0650 continued Part Number 23620 0256 23620 9007 23685 0007 25021 0901 25061 9503 25380 0229 27106 0513 27153 0030 27161 0120 27164 0507 27230 0530 27231 2730 27234 5730 27250 2000 28502 0010 35555 2160 43171 1310 PCB ASSY 5V 7A DRIVER PL330QMT 44115 0660 Part Number 10300 0313 20030 0263 20038 9501 20210 0101 20234 0011 20611 0003 20613 0006 20670 0200 22300 0211 22315 0240 22573 0203 22573 0205 22573 0207 22575 0065 23185 000
22. 46115 0770 Part Number 10232 0304 10232 0305 20030 0240 20037 0304 20037 0401 20038 9502 20040 9401 20062 9303 20062 9308 20210 0102 20213 0010 20234 0014 20234 0023 20234 0029 20611 9305 20661 0242 20661 0259 20661 0605 20661 9302 22300 9301 22443 0003 22451 0041 22448 0220 22573 0204 34 Description SLEEVE H30 X 20MML BLACK SLEEVE 20 X 20 BLACK WASHER ZPST WASHER M4 SHK PROOF ZPST CHASSIS HEATSINK POST SOLDER TAG SHAKEPROOF 4BA WASHER M4 SPRING COVER EARTH 1 2 3 NUT No 6 FLAT SCREW NO 6 X 0 5 PNHDPZ ST AB SCREW No 6x3 8 PAN NUT M4 ZPST EARTH HEATSINKS BR1 2 3 CAPTIVE NUT SNU 1219 17 00 SCREW M4 X 20 PNHDPZ ZPST SCREW M4 X 8 PNHDPZ ZPST COVER EARTH HEATSINK SCREW M4 X 12 PNHDPZ ZPST TRAN MOUNTING BUSH 5 18 4 1 SPACER HEX M4 x 25 NPBR SPACER RND 3 8 0Dx 175 ID NYL SPACER PCB SUPPORT 7 8 NYL SPACER HEX STUD M4 x 25 ZPST FUSEHOLDER PANEL MOUNTING GROMMET PV93 RECEPTACLE RED BUSH STRAIN RELIEF SR 5N 4 HEADER 4 WAY STRAIGHT Position FUSEHOLDER MAINS SWITCH TRANSFORMER TRANSFORMER HEATSINK FEET TRANSFORMER CHASSIS DRIVER SPACERS CHASSIS TRANSFORMER BR1 2 3 HEATSINK HEATSINK HEATSINK HEATSINK DRIVER PCB MOUNTING HEATSINK BR1 2 3 PJ4 DRIVER CHASSIS ASSY PL310 46115 0550 CHASSIS ASSY PL320 46115 0580 CHASSIS ASSY PL330 46115 0610 CHASSIS ASSY PL154 46115 0630 CHASSIS ASSY PL310QMD 46115 0730 CHA
23. 59 0380 0390 37559 0410 0400 PL310QMD QMT PL320QMD 37559 0140 0150 37559 01 70 0160 PL320QMT 37559 0420 0430 37559 0450 0440 PL330QMD 37559 0300 0310 37559 0330 0320 PL330QMT 37559 0340 0350 37559 0370 0360 37 Component Layout PL330QMT 5V 7A Section Component Layout PL32OQMT 5V 4A Section pue 409 SIIDA 2 SSI MLy ss 834 2 SSI ASSV kal kal B 5 I o s qod UFEN O 9 Wd 5 Wd 279 62 229 55 8VVVM 0 Ba R A AS XV lt s m 6 gt 8 231 22 6 2 gt 973 02 w Ory AS 71 T Tu 40 ASSY XII5LV3 en 31514 3015 06 131114 SI TSH
24. 5V SOLDER TAG 4BA TERMINAL PCB a b c HEADER 5 WAY STRAIGHT 156P PJ2A c SKT 4W 156 20AWG Yellow IDT b a FRONT PANEL ASSY PL310 320 330 154 b FRONT PANEL ASSY PL310QMD 320QMD 330QMD c FRONT PANEL ASSY PL310QMT d FRONT PANEL ASSY PL320QMT e FRONT PANEL ASSY PL330QMT Part No 22575 0207 23424 0454 23620 0246 33331 5000 33331 5040 33331 5050 33331 5060 33331 5070 33331 5100 33331 5110 33331 5120 33331 5130 33331 5300 33331 5310 33331 5410 33331 5420 35515 1320 Description SKT 7W 156 20AWG Yellow IDT d e 10NZ 1 CER P10 CAP 100NK 63V OP E P5 d e FRONT PANEL PL Single a OVERLAY FRONT PANEL PLa OVERLAY FRONT PANEL PL310 a OR OVERLAY FRONT PANEL PL154 a OR OVERLAY FRONT PANEL PL330 a FRONT PANEL PLQMD b c OVERLAY FRONT PANEL PLQMD b OVERLAY FRONT PANEL PL310QMD b OR OVERLAY FRONT PANEL PL330QMD b FRONT PANEL PLQMT d e OVERLAY FRONT PANEL PL330QMT e OVERLAY FRONT PANEL PL310QMT c OVERLAY FRONT PANEL PL320QMT d PCB TERMINAL UNIVERSAL d e UNIQUE PARTS Position TERMINAL PCB continued a b c 33 CHASSIS ASSY PL310 46115 0550 CHASSIS ASSY PL320 46115 0580 CHASSIS ASSY PL330 46115 0610 CHASSIS ASSY PL154 46115 0630 CHASSIS ASSY PL310QMD 46115 0730 CHASSIS ASSY PL320QMD 46115 0740 CHASSIS ASSY PL330QMD 46115 0460 CHASSIS ASSY PL310QMT 46115 0660 CHASSIS ASSY PL330QMD 46115 0790 CHASSIS ASSY PL330QMD
25. MT 44115 0680 continued Part No Description Position 25130 0231 DIO ZEN 8V2 W4 D10 25130 0903 DIO ZEN 5V1 W4 D9 25130 0913 DIO ZEN 6V8 W4 D4 25341 0214 TRAN PNP ZTX214L BC559 Q1 4 25380 0229 TRAN NPN BC549 Q7 25383 0505 TRAN NPN BC338 Q3 5 25386 9300 TRAN TIP31A Q2 25801 9501 Thyristor TAG 666 100 SCR1 27106 0506 IC LM324N 14 PIN IC1 27161 0120 IC V REF W DIO ZN404 2 45V D8 35515 1370 PCB 5V PL320QMT PCB ASSY SWITCHBANK 10MM PL310QMD QMT 44115 0640 PCB ASSY SWITCHBANK 10MM PL320QMD QMT 44115 0630 COMMON PARTS PCB ASSY SWITCHBANK 10MM PL330QMD QMT 44115 0620 Part Number Description Position 20010 0205 POP RIVET TAP D 33BS 20040 9501 NUT No 4 Angle 22225 0750 SWITCHBANK 22573 0204 HEADER 4 WAY STRAIGHT 156P PJ8 22575 0204 SKT 4W 156 20AWG Yellow IDT 22575 0205 SKT 5W 156 20AWG Yellow IDT 22575 0207 SKT 7W 156 20AWG Yellow IDT 23185 0000 RES ZERO OHM LK1 23202 4180 RES 180KF W25 MF 50PPM R3 23379 3100 RES PS H 10K Cermet 10mm skel VR1 23620 0246 100 63V P E P5 C1 35515 1340 PCB SWITCHBANK PL 10mm 37113 0170 BUTTON SWITCHBANKS MID GREY 30 a PCB ASSY SW B 10MM PL310QMD QMT UNIQUE PARTS b PCB ASSY SW B 10MM PL320QMD QMT PCB ASSY SW B 10MM PL330QMD QMT Part Number Description Position_ 23202 2316 RES 3K16F W25 MF 50PPM R4 C 23202 2536 RES 5K36F W25 MF 50PPM R4 b 23202 3105 RES 10K5F W25 MF 50PPM R4 a 23206 0010 RES 1R0F W60 MF 100PPM MRS25 R1A 1B 2A 2B a 23206
26. PL Series Power Supplies Service Manual Book Part Number 48511 0150 Table of Contents General 1 Specification 3 Installation 6 Functional Description Main Outputs 9 Circuit Description Main Outputs 10 Calibration Main Outputs 12 Quad Mode Calibration 13 Quad Mode Triples 14 Funcitonal Description 5V 7A Module PL330 QMT 14 Circuit Description 5V 7A Issue 2 PCBs and later 14 Calibration 5V 7A Module 17 Functional Description 5V 4A Module PL320QMT 18 Circuit Description 5V 4A 18 Calibration 5V 4A 19 Circuit Description 5V 1 5A PL310QMT 19 Parts List 20 Component Layouts amp Circuit Diagrams 38 General Applicability of this Manual This Service Manual is for the revised PL models introduced from mid 1991 with the exception of the PL P 3Amp programmable models which are covered by a separate manual The revised PLs differ substantially in their circuit configurations from their predecessors whilst functionally remaining very similar the new models can however be very easily distinguished from the earlier series because they have a push button current damping switch instead of a panel mounted rocker switch The earlier PLs are covered by separate manuals for the manual and programmable versions Introduction The PL series of power supplies are fully variable series regulated units incorporating separate digital meters for voltage and current Separate voltage and current control cir
27. SSIS ASSY PL320QMD 46115 0740 CHASSIS ASSY PL330QMD 46115 0460 CHASSIS ASSY PL310QMT 46115 0660 CHASSIS ASSY PL330QMD 46115 0790 CHASSIS ASSY PL330QMD 46115 0770 continued Part No 22573 0205 22573 0207 22575 0203 22575 0205 22575 0210 25211 0300 31512 0450 31512 0400 31512 0360 31512 0430 31512 0510 33536 3550 33536 3560 33536 3580 37541 9010 22115 0190 22115 0210 22115 0230 22115 0250 43751 9010 43751 9090 43751 9100 Description HEADER 5 WAY STRAIGHT OR HEADER 7 WAY STRAIGHT SKT 3W 156 20AWG Yellow IDT SKT 5W 156 20AWG Yellow IDT SKT 10W 156 20AWG Yellow IDT RECTIFIER BRIDGE 25 AMP 200V COVER HEATSINK PL310 320 154 COVER HEATSINK PL330 COVER HEATSINK PL310QMD 310QMT 320QMT COVER HEATSINK PL330QMD COVER HEATSINK PL330QMD 330QMT 320QMT CHASSIS PL SINGLE CHASSIS PLQMD 310QMT CHASSIS PL320QMT 330QMT LABEL TRANSFORMER SHROUD PL TRANSFORMER PL 5V 7A TRANSFORMER PL330 330QMD 330QMT TRANSFORMER PL310QMT TRANSFORMER PL320QMT TRANSFORMER PL310 310QMD 310QMT TRANSFORMER PL320 320QMD 320QMT TRANSFORMER PL154 Position PJ2A MAIN PJ2A MAIN TRANSFORMER TRANSFORMER BR1 2 3 35 PL310 CASE PARTS 51000 0101 PL320 CASE PARTS 51000 0201 PL330 CASE PARTS 51000 0301 PL154 CASE PARTS 51000 0401 PL310QMD CASE PARTS 51000 0501 PL320QMD CASE PARTS 51000 0601 PL330QMD CASE PARTS 51000 0701 PL310QMT CASE PARTS 5100
28. adjust VR7 for 6 0V to 6 05V on the external voltmeter Note the reading and set the output switch to OFF adjust VR8 on the main pcb for the same reading on the internal meter Current Set output switch to ON Set current limit control to maximum Set VR3 on the driver pcb fully clockwise Connect the DMM set to 20A range in series with an adjustable load to the O P terminals Adjust the load for 5 to 6 Amp output current Adjust VR5 on the driver pcb so that the external and internal meters read the same Adjust the load and or outputput voltage to give 7 1 Amps output current Fine adjust VR3 until the decimal points just start to flash Check 7 Amps output can be achieved without de decimal points flashing 17 Functional Description 5V 4A Module PL320QMT This is very similar to the linear section of the 5V 7A module Refer to this section for the description Circuit Description 5V 4A Power Supply Mains This consists of a full wave bridge rectifier feeding the reservoir capacitor C1 The full load secondary voltage is 11V rms giving approximately 15Volts off load and 12V on full load Power Supply Auxiliary This consists of twin full wave rectified supplies from 21V centre tapped winding D10 and Q5 generate 7V5 and D9 the 5V OV of this supply is connected to the positive output at R32 Voltage Control IC1A buffers the voltage control pot and VR5 sets maximum output voltage of the unit D8 is the reference which
29. arly marked A 0 110 120 B 0 110 120 Rewire as follows 240V operation Neutral blue wire to A0 Link red wire from A120 to BO Live brown wire to B120 220V operation Neutral blue wire to AO Link red wire from A110 to BO Live brown wire to B110 120V operation Neutral blue wire to AO Link black wire from AO to BO Link red wire from A120 to B120 Live brown wire to B120 110V operation Neutral blue wire to AO Link black wire from AO to BO Link red wire from A110 to B110 Live brown wire to B110 Note Units factory set to 220 or 240V will have no black link wire this must be provided when converting to 110 120V operation When converting a 110 120V unit to 220 240V the black link wire should be discarded 5 Reassemble in the reverse order 6 Change the fuse type if necessary Important Note IEC 348 Safety Regulations state that the AC line voltage to which the apparatus is set must be clearly marked on the outside If the line voltage setting is changed it is imperative that the voltage marked on the label close to the power lead entry point is also changed Fuse The AC fuse is located on the back panel The correct fuse type is 20mm x 5mm 250V HBC time lag with the following rating Model 220 240V 110 120V PL310 PL320 PL154 single 1 2 PL330 single 1 6AT 3 15AT PL310QMD PL320QMD PL310QMT PL320QMT 2AT PL330QMD 3 15AT 6 3AT PL330QMT Make sure that only fuses with t
30. control buffer amplifies and provides low output impedance from the voltage controls The 12 bit Ato D measures output voltage with the output switch off and output current with the output switch on selected by the multiplexer The micro controller reads the output of the A to D and drives the display Circuit Description 5V 7A Issue 2 PCBs and later Power Supply Mains This consists of a full wave bridge rectifier feeding the reservoir capacitor C30 The full load secondary winding voltage is 11V rms giving approximately 15 volts off load and 12V on full load Power Supply Auxiliary This consists of twin full wave rectified supplies from a 21V centre tapped winding IC8 generates 5V for the micro Controller display and A to D Q7 and D10 generate 7 5V for the analogue section 011 generates 5V for the analogue section and to D OV of this supply is connected to the positive output at R62 Voltage Control 14 IC7A buffers the voltage control pot and VR7 sets maximum output voltage of the unit D9 is the reference which is nominally 2 45V 7V 5 Block Diagram 5V 7A Output Issue 2 pcb onwards 15 1 7 is a differential amplifier with a voltage gain of 13 3 For 6V output this means the voltage at will be 450mV trims differential gain and effects voltage regulation This can be set more accurately by generating a few hundred millivolts between positive output and posit
31. cover is removed by removing the two screws through the handle and the remaining screws on each side and on the top The front panel may be disconnected from the chassis by removing the two front feet and the self tapping screws directly between them This allows the front panel to be laid forward giving improved access to the rear of the PCB All preset adjustments are accessible through the PCB Should it be necessary to gain access to the front of the PCB press in the retaining barb on each corner fixing pillar and lift off the pcb having first removed the 3 control knobs Main Output s Output Range Output Voltage Setting Output Current Setting Output Mode Configuration Selection QMD and QMT only Output Switch Output Terminals Output Impedance Constant Voltage Constant Current Output Protection Load Regulation Line Regulation Remote Sense Ripple and Noise Transient Response Temperature Coefficient Meter Type Meter Resolution Voltage Current Meter Accuracy Voltage Current Current Meter Damping Specification 0 32 Volts nominal 0 15 5V PL154 0 1 1A nominal PL310 0 2 1A nominal PL320 0 3 1A nominal PL330 0 4A PL154 By coarse and fine controls resolution better than 5mV across the range By single logarithmic control The power supply operates in constant current or constant voltage modes with automatic cross over Decimal points flash to indicate constant
32. cuits enable them to operate in constant voltage or constant current mode from 0 to 32 Volts at 0 to 1 1 Amps 2 1 Amps or 3 1 Amps 0 to 15 Volts at 4 Amps PL154 triple versions have additional 5 Volt logic supply outputs In addition to the AC input switch there is DC output switch When this switch is the ve output is disconnected and the current meter reads the value of the current control setting The current meter decimal points are used to indicate the mode as follows Decimal points off output switch on constant voltage operation meter reading output current Decimal points on output switch meter reading current limit setting Decimal points flashing output switch constant current operation meter reading output current A damping switch is incorporated on the current meter This provides a long time constant which averages out rapidly fluctuating load currents The input to the voltage control circuit and voltage meter are brought out to the front panel terminals labelled sense These are normally connected to the output terminals by shorting bars but can be connected to the output at the load via separate leads in order to eliminate inaccuracies caused by lead resistances Quad Mode Dual QMD versions incorporate push button switches enabling Isolated Parallel Series or Series Tracking operations to be selected Quad Mode Triple QMT units are the same as the QMD supplies but have an addi
33. e Ripple and Noise Transient Response Temperature Coefficient Voltage Setting Accuracy 4 to 6 Volts 0 1 to 7 Amps Electronic 4mm terminals on 19mm 75 spacing Above 7 Volts Clamped by the over voltage protection circuit for forward voltages over 7 Volts and up to 1 Amp forward current Diode clamped for reverse voltages and up to 3 Amps reverse current lt 0 01 of maximum output for 90 load change lt 0 01 of maximum output for 10 line voltage change Eliminates up to 0 5V drop per lead Typically lt 1mV rms lt 20usec to within 50mV of setting for 90 load change Typically lt 100ppm C 3 75 digit 4095 count with 12 5mm 0 5 LEDs Reading rate 4 per second 10 10 0 5 of reading 1 digit 4 to 6 Volts 0 1 to 4 Amps Electronic 4mm terminals on 19mm 75 spacing Above 7 Volts Clamped by the over voltage protection circuit for forward voltages over 7 Volts and up to 1 Amp forward current Diode clamped for reverse voltages and up to 3 Amps reverse current lt 0 01 of maximum output for 90 load change lt 0 01 of maximum output for 10 line voltage change Eliminates up to 0 5V drop per lead Typically lt 1mV rms lt 20usec to within 50mV of setting for 90 load change Typically lt 100ppm C Better than 0 1V Logic Output PL310QMT Output Voltage Output Current Output Terminal Output Protection Load Regulation Load Regulation GENERAL Power Requirements
34. entional interruption is prohibited 5 COARSE ELFFER VOLTAGE 6 RS1 FOR CONTROL PASS OUTPUT VOLTAGE IC7B TRANSISTORS SWITCH LI 2 0 FINE OPON 5 0 CO 5 1 I 5 ILIMIT 7VS CURRENT k CONTROL 1C7C li 29 MULTIPLEXER 5V 5V ea ILIMIT MICRO DISPLAY CONTROLLER ML DRIVE CURRENT DISPLAY ov 0 ov 7 5 SV 0V Vi Block diagram Main Outputs Functional Description Main Outputs The relationship between the major circuit elements is shown in the block diagram opposite The transformer incorporates two secondary windings one which produces the main supply powering the output and another which produces an auxiliary supply powering the control and metering circuits The series regulator is placed in the positive output of the main supply but because of the way in which the control and metering circuits operate it is convenient to label the output of the series regulator as 0 volts and to regard the negative side of the main supply as being the controlled output voltage V out The auxiliary supply provides stabilised symmetrical voltage outputs V and V with the common point connected to the ve output The series regulator is controlled by the voltage control circuit until the output current flowing reaches the current limit s
35. equired 5 5 digit multimeter with better than 0 05 accuracy on voltage and better than 0 1 accuracy on current or use a precision current shunt Asmall switch 18K resistor and a diode Preparation Preset adjustments are accessible from both sides of the main pcb their idents are also marked on both sides of the pcb Take great care not to touch the mains connections on the transformers during adjustment Use an insulated trim tool Allow five minutes warm up before proceeding Calibration To avoid errors when making voltage measurements the DVM must be connected directly to the sense terminals Voltage Differential Gain Remove the link between O P and sense only and fit a diode cathode to sense and anode to O P Connect the small switch across the diode Connect the 18K resistor between O P and sense Connect the DVM set to 20V range to the sense terminals Close the switch Set the DC output switch on Set the output voltage to approximately 14V Note the reading Open the switch and adjust for the same reading 0 5mV Close and open the switch and check the reading Voltage Output and meter Remove the switch and 18K resistor and refit the link between O P and sense Set coarse and fine controls to maximum and adjust VR3 to 32 1V or 15 6 on PL154 on the external DVM Adjust VR6 so the internal meter reads the same as the DVM Current Set output switch to OFF Set the current limit contro
36. etting upon which the current control circuit takes over The voltage control buffer amplifies and provides low output impedance from the voltage controls The input to the voltage control circuit is from the control buffer or from the master output on the slave side of PLQMD PLQMT units The 12 bit Ato D measures output voltage and either preset current or output current selected by the multiplexer The micro controller reads the output of the A to D and drives the appropriate display Circuit Description Main Outputs Refer to the appropriate schematic at the back of this manual Power Supply Mains This consists of a full wave bridge rectifier feeding the reservoir capacitor C31 The full load secondary winding voltage is 36V rms giving approximately 55 volts off load and 40V on full load 24V 154 Power Supply Auxiliary This consists of twin full wave rectified supplies from 21 centre tapped winding IC8 generates 5V for the micro Controller display and Ato D Q7 D10 generate 7 5 for the analogue section 011 generates 5V for the analogue section and A to D OV of this supply is connected to the positive output at R51 Voltage Control IC7A buffers the voltage control pots and VR3 sets maximum output voltage of the unit D6 is the reference which is nominally 2 45V 1 7 is a differential amplifier with a voltage gain of 13 3 For output this means the voltage at PJ2 8 w
37. he required rated current and of the specified are used for replacement The use of makeshift fuses and the short circuiting of fuse holders is prohibited Mains Lead When a three core mains lead with bare ends is provided this should be connected as follows BROWN MAINS LIVE BLUE MAINS NEUTRAL GREEN YELLOW EARTH When fitting a fused plug a 5amp fuse should be fitted inside the plug As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug proceed as follows The wire which is coloured green and yellow must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol or coloured green or green and yellow The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red If the unit is to be connected to the main supply by fixed wiring rather than via an AC line plug then the protective earth ground wire in the 3 core mains lead shall be connected to a protective conductor before any other connection is made WARNING THIS APPARATUS MUST BE EARTHED Any interruption of the protective conductor inside or outside the apparatus or disconnection of the protective earth terminal is likely to make the apparatus dangerous Int
38. ill be 2 25V and for 15V output 1 125V trims differential gain and effects voltage regulation This can be set more accurately by generating a few hundred millivolts between positive output and positive sense see calibration section Current Control IC7C is the error amplifier and compares the voltage on the wiper of VR5 with the voltage generated across the current sense resistor R51 When this limit is reached takes control changing the supply output from constant voltage to constant current Current limit is indicated to the micro controller by ILIMIT going high The sense resistor is 100 milli Ohm therefore with the current limit set to 2A the voltage on the wiper of VR5 will be typically 188mV when VR7 is set central VR8 adjusts the output current to be the same as the preset current at low levels VR4 trims maximum output current Series Regulator Q1 and Q2 form a triple Darlington On 2 Amp and 4 Amp versions Q2 is in parallel with Q3 Q4 and Q5 On 3 Amp versions Q2 is in parallel with Q3 Q4 Q5 Q8 and Q9 Q1 is a Darlington and is on a heatsink on the driver pcb AtoD IC2 is a 12 bit dual slope converter Its reference is derived from D6 by R27 and R28 and is typically 180mV 11 is either 4MHz crystal or ceramic resonator The buffered oscillator output is also used by the microcontroller IC1 Analogue multiplexer IC3 selects measurement of output voltage preset current or output current R65 and C38 provide
39. is nominally 2 45V is a differential amplifier with a voltage gain of 13 3 For 6V output this means the voltage at will be 450mV trims differential gain and effects voltage regulation This can be set more accurately by generating a few hundred millivolts between positive output and positive sense see Calibration section Current Control is the error amplifier and compares the voltage on the wiper of VR3 with the voltage generated across the current sense resistor R32 When this limit is reached IC1D takes control This turns on Q1 which lights the current limit LED To limit power dissipation in the series regulator the power supply has foldback current limiting When the output falls below 3 5V IC1C reduces the output current by reducing the voltage on VR3 Over Voltage Protection When the voltage on the output terminals exceeds 7V SCR1 is fired crowbaring the output When the output switch is turned off Q4 is turned on which turns the series regulator off which allows SCR1 to turn off 18 Calibration 5V 4A Equipment Required 5 5 digit multimeter A small switch 560 Ohm resistor and a diode VOLTAGE Differential Gain Remove the link between O P and sense only and fit a diode cathode to sense and anode to O P Connect the small switch across the diode Connect the 560 Ohm resistor between O P and sense Connect the DVM set to 20V range to the sense terminals Clo
40. ive sense see calibration section Current Control is the error amplifier and compares the voltage on the wiper of VR3 with the voltage generated across the current sense resistor R62 When this limit is reached IC3A takes control Current limit is indicated to the micro controller by ILIMIT going high The sense resistor is 50 milli Ohm therefore with the current limit set to 7A the voltage on the wiper of VR3 will be typically 330mV when 5 is set central To limit power dissipation in the series regulator the power supply has foldback current limiting When the power supply enters current limit the microcontroller also monitors the output voltage and if this falls below 3 5V IC6B is switched from VR2 to a simple 3 bit DAC so that the microcontroller can take control of the current limit and reduce it as the output voltage falls Series Regulator Q5 Q2 and Q3 form a triple Darlington When the output current reaches 3 Amps Q8 starts conducting Over Voltage Protection When the voltage on the output terminals exceeds 7V SCR1 is fired crowbaring the output Current flowing through D6 is detected by IC9B which drives the trip line high informing the microcontroller of the trip condition The microcontroller then turns the series regulator off via Q4 AtoD IC2 is a 12 bit dual slope converter Its reference is derived from D9 by R29 and R30 and is typically 180mV 11 is either 4MHz crystal or ceramic resonator The b
41. l for a reading of 10mA Set output switch to ON ON and short the output terminals Adjust VR8 for a reading of 10mA Remove the short and connect an ammeter between the output terminals Set current limit to approximately 900 PL310 1800 PL320 2700 330 3600 PL154 adjust VR7 so that the internal external ammeters read the same 12 Set current limit to maximum output off and adjust VR4 for 1100mA PL310 2100mA PL320 3100mA PL330 4050mA PL154 Quad Mode Calibration ii The above calibration must be carried out first PL310QMD QMT PL320QMD QMT Select parallel mode output switches OFF Master current limit to maximum Adjust VR2 on switchbank pcb for 2100 PL310QMD QMT 4050 PL320QMD on the master ammeter Select tracking mode output switches ON Set master output voltage to approximately 30V Adjust VR1 on switchbank pcb so that the above voltmeter reads the same as the master voltmeter PL330QMD QMT Select parallel mode output switches OFF Set master current limit to approximately 5A Master output switch ON Connect ammeter between the master output terminals Adjust VR10 on the master main pcb for the same reading on the internal and external ammeters Remove external ammeter and connect the DVM to the master sense terminals Set master coarse voltage control to maximum Adjust VR11 on the master main pcb for the same reading on the internal and exter
42. nal voltmeters Note In parallel mode VR10 affects both the voltmeter and ammeter calibration VR11 affects only the voltmeter Output switches OFF Master current limit to maximum Adjust VR2 on the switchbank pcb for 6100mA on the master ammeter Select tracking mode output switches ON Set master output voltage to approximately 30V Adjust VR1 on switchbank pcb so that the slave voltmeter reads the same as the master voltmeter 13 Quad Mode Triples Funcitonal Description 5V 7A Module PL330 QMT The relationship between the major circuit elements is shown in the block diagram The transformer incorporates two secondary windings one which produces the main supply powering the output and another which produces an auxiliary supply powering the control and metering circuits The series regulator is placed in the positive output of the main supply but because of the way in which the control and metering circuits operate it is convenient to label the output of the series regulator as 0 volts and to regard the negative side of the main supply as being the controlled output voltage V The auxiliary supply provides stabilised symmetrical voltage outputs V and V with the common point connected to the ve output The series regulator is controlled by the voltage control circuit until the output current flowing reaches the current limit setting upon which the current control circuit takes over The voltage
43. rt Number 20030 0240 20037 0247 20038 9503 20062 9301 20062 9308 20134 9005 20213 0010 20661 0257 20661 0604 22219 0060 22219 0080 22571 0670 22571 0680 22571 0690 22571 0691 22575 0205 25117 0020 35331 0080 35515 1210 a FRONT PANEL ASSY PL310 320 330 154 b FRONT PANEL 55 PL310QMD 320QMD 330QMD 46115 0600 46115 0670 46115 0780 46115 0680 COMMON PARTS Description Position WASHER 4BA ZPST TERMINALS WASHER SHK PROOF ZPST TERMINAL GREEN WASHER M3 5 SPRING TERMINALS SCREW No 4x3 8 Pozi Pan SW PCB SCREW No 6x3 8 Pozi Pan PCB FIXING SCREW 4BA x 1 4 Pozi Pan TERMINALS CAPTIVE NUT SNU 1219 17 00 SPACER Hex 4BA x 1 2 NPBR TERMINALS SPACER PCB Support 1 2 Nyl MAIN PCB MTG SWITCH PADDLE DPST SOLDER LUGS MAINS ON OFF SWITCH PADDLE DPDT PCB MTG DC ON OFF TERMINAL INSULATED RED TP2 TERMINAL INSULATED BLACK TP2 TERMINAL INSULATED GREEN TP2 WASHER ALUMINIUM FOR TP2E TERM SKT 5W 156 20AWG Yellow IDT DIO 1N5401 SHORTING BAR PLATED PCB Terminals PLs TERMINAL PCB UNIQUE PARTS c FRONT PANEL ASSY PL310QMT 15 PANEL 55 PL320QMT FRONT PANEL ASSY PL330QMT 57 Part Number 20030 0263 20038 9501 20210 0101 20234 0042 20661 0246 22451 0200 22573 0205 22575 0204 32 Description Position WASHER M3 PCB 5 SPRING 5 NUT M3 PCB 5 SCREW X 30 5 SPACER ROUND 9 64 ID11 16 L
44. se the switch Set the DC output switch on Set the output voltage to approximately 5V Note the reading Open the small switch and adjust VR4 for the same reading 0 5mV Close and open the small switch and check the reading VOLTAGE Output Remove the switch and resistor and refit the link between O P and sense Set the voltage control to maximum and adjust VR5 for 6 0V to 6 05V output CURRENT Set current limit to maximum Connect a load of 4 1A and adjust VR2 until the current limit LED just comes on check the LED is off at 4A Circuit Description 5V 1 5A PL310QMT An extra winding on the master output transformer provides approximately 8V rms off load D1 to D4 form a bridge rectifier and C1 and C2 the reservoir capacitor IC1 is a fixed 5V three terminal low drop out regulator D5 and D6 provide protection No calibration is required see Technical Specification section for performance figure 19 PCB ASSY MAIN PL310 310QMD 310QMT 44115 0440 PCB ASSY MAIN PL320 320QMD 320QMT 44115 0400 Parts List PCB ASSY MAIN PL330 330QMD 330QMT 44115 0600 COMMON PARTS PCB ASSY MAIN PL154 PCB ASSY MASTER PL330QMD 330QMT 44115 0590 Part Number 10300 0313 22225 0220 22573 0063 22573 0205 22573 0210 23185 0220 23185 0270 23185 1470 23185 2100 23185 2180 23185 2470 23185 3100 23185 3330 23185 3470 23185 4100 23185 4220 23185 6100 23202 1330 23202 2105 23202 2845 23202 3143
45. the current meter damping facility Microcontroller The measurement system and display is controlled by a microcontroller The two 4 digit LED displays are driven by IC1 via the segment latches IC4 and IC9 and the digit latch IC5 Digit current is provided by 126 and individual segment current is limited to 50 by the resistors R10 and R17 The digit on time rate is 2ms and is controlled by IC1 which also provides the inter digit blanking to prevent ghosting segments The measurement of output values of voltage and current is performed by the 12 bit analog to digital converter IC2 The measurement rate is controlled by the 4 0MHz ceramic resonator XL1 connected between pins 22 and 23 and the buffered version of this 4MHz signal at pin 25 is used as the clock to the microcontroller IC1 The ADC 2 is a dual slope converter and provides a little over 8 readings per second when clocked at 4MHz The ADC is run in continuous mode and 10 the status signal on pin 2 is read by the microcontroller every 6ms When a reading is ready the microcontroller reads the 12 bit binary value and then converts it to 7 segment BCD and stores it ready to be sent to the display After each reading the microcontroller switches the input multiplexer to the next required input In this way it is possible to read and display any of the following Output Volts equal to Preset Volts when the output switch is off Output Current Preset Current The
46. tional higher current 5V output intended for powering logic circuits The current rating and sophistication of the logic output varies according to the model from 5 Volt fixed at 1 5 Amp maximum to 4 6 Volt variable with a 0 1 7 Amp variable current limit General and Safety This manual has been prepared to aid the experienced engineer in the maintenance and repair of PL Series power supplies It should be used in conjunction with the owner s instruction manual Recalibration or repair should only be attempted by skilled personnel in conjunction with high quality test equipment If the user is in any doubt as to his competence to carry out the work the supply should be returned to the manufacturer or their agent overseas for the work to be carried out When the power supply is connected to the AC line terminals may be live and the opening of covers or removal of parts except those to which access can be gained by hand is likely to expose live parts The supply shall be disconnected from all voltages sources before it is opened for any adjustment replacement maintenance or repair Capacitors inside the supply may still be charged even if the supply has been disconnected from all voltage sources Any adjustment maintenance or repair of the opened supply under voltage shall be avoided as far as possible and if inevitable shall only be carried out by a skilled person who is aware of the hazard involved Dismantling the Equipment The
47. uffered oscillator output is also used by the microcontroller IC1 Analogue multiplexer IC3 selects measurement of preset voltage or output current Microcontroller 16 The measurement system and display is controlled by a microcontroller The 4 digit LED display is driven by the segment latch 4 and the digit latch IC5 Digit current is provided by IC3 and individual segment current is limited to 25mA by the resistors R10 and R17 The digit multiplex rate is 2ms and is controlled by which also provides the inter digit blanking to prevent ghosting segments The measurement of output values of voltage and current is performed by the 12 bit analog to digital converter IC2 The measurement rate is controlled by the 4 0MHz ceramic resonator XL1 connected between pins 22 and 23 and the buffered version of this 4MHz signal at pin 25 is used as the clock to the microcontroller IC1 The ADC 2 is a dual slope converter and provides a little over 8 readings per second when clocked at 4MHz The ADC is run in continuous mode and the status signal on pin 2 is read by the microcontroller every 6ms When a reading is ready the microcontroller reads the 12 bit binary value and then converts it to 7 segment BCD and stores it ready to be sent to the display The output is electronically switched The output from the unit bypasses the output switch links and the OPON signal drives Q4 via inverter Q5 When OPON is low 4 is

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