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TTI PL Series Service Manual

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PL Series
Power Supplies
Service Manual
Book Part Number 48511-0150

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Summary of Contents for TTI PL Series

  • Page 1 PL Series Power Supplies Service Manual Book Part Number 48511-0150...

  • Page 2: Table Of Contents

    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 circuits 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);...
  • Page 3 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.

  • Page 4: Specification

    Specification Main Output(s) Output Range: 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) Output Voltage Setting: By coarse and fine controls; resolution better than 5mV across the range. Output Current Setting: By single logarithmic control. Output Mode: The power supply operates in constant current or constant voltage modes with automatic cross-over.
  • Page 5 Logic Output (PL330 QMT) Output Voltage Range: 4 to 6 Volts Output Current: 0.1 to 7 Amps. Output Switch: Electronic Output Terminals: 4mm terminals on 19mm (.75") spacing. Over-Voltage Protection: Above 7 Volts Output Protection: Clamped by the over-voltage protection circuit for forward voltages over 7 Volts and up to 1 Amp forward current.
  • Page 6 Logic Output (PL310QMT) Output Voltage: Fixed 5V ± 0.1V Output Current: 0 to 1.5 Amps Output Terminal: 4mm terminals on 19mm (0.75") spacing Output Protection: Output will withstand up to 16V forward voltage. Diode clamped for reverse voltages and up to 3 Amps reverse current. Load Regulation: <0.3% for 50% load change Load Regulation:...

  • Page 7: Installation

    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: Ensure that the instrument is disconnected from the AC supply. Remove the screws holding the case upper and handle.
  • Page 8 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) PL330 (single) 1.6AT 3.15AT PL310QMD/PL320QMD/PL310QMT/PL320QMT PL330QMD 3.15AT 6.3AT PL330QMT Make sure that only fuses with the required rated current and of the specified type are used for replacement.
  • Page 9 Block diagram - Main Outputs...

  • Page 10: Functional Description - 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.

  • Page 11: Circuit Description - Main Outputs

    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 (30V and 24V on PL154).
  • Page 12 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 IC3 to the next required input.

  • Page 13: Calibration - Main Outputs

    Calibration – Main Outputs Equipment Required A 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. A small 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.

  • Page 14: Quad Mode Calibration

    Set current limit to maximum, output off and adjust VR4 for: 1100mA - PL310 2100mA - PL320 3100mA - PL330 4050mA - PL154 Quad Mode Calibration The above calibration must be carried out first. PL310QMD/QMT and PL320QMD/QMT Select parallel mode, output switches OFF Master current limit to maximum Adjust VR2 on switchbank pcb for 2100mA - PL310QMD/QMT...

  • Page 15: Quad Mode Triples

    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.
  • Page 16 Block Diagram – 5V/7A Output (Issue 2 pcb onwards)
  • Page 17 IC7B is a differential amplifier with a voltage gain of 13.3. For 6V output this means the voltage at IC7A will be 450mV. VR4 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.

  • Page 18: Calibration - 5V/7A Module

    Calibration - 5V/7A Module Equipment Required A 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. A small switch, 560 Ohm resistor and a diode. Preparation Preset adjustments are located on both the main and driver pcbs.

  • Page 19: Functional Description - 5V/4A Module (Pl320Qmt)

    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.

  • Page 20: Calibration - 5V/4A

    Calibration - 5V/4A Equipment Required A 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.

  • Page 21: Parts List

    Parts List 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 - PL154 (44115-0700) PCB ASSY - MASTER - PL330QMD/330QMT (44115-0590) Part Number Description Position...
  • Page 22 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 - PL154 - 44115-0700 ) PCB ASSY - MASTER - PL330QMD/330QMT - 44115-0590 ) continued/...
  • Page 23 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...
  • Page 24 PCB ASSY - DRIVER - PL310/310QMD/310QMT (44115-0450) ) PCB ASSY - DRIVER - PL320/320QMD/320QMT (44115-0410) ) - COMMON PARTS PCB ASSY - DRIVER - PL330/330QMD/330QMT (44115-0610) ) PCB ASSY - DRIVER - PL154 (44115-0710) ) Part Number Description Position 20037-0301 WASHER M3 SHK/PROOF I/T ZPST FOR IC8 &...
  • Page 25 a) PCB ASSY - DRIVER - PL310/310QMD/310QMT (UNIQUE PARTS) b) PCB ASSY - DRIVER - PL320/320QMD/320QMT " " c) PCB ASSY - DRIVER - PL330/330QMD/330QMT " " d) PCB ASSY - DRIVER - PL154 " " Part Number Description Position 22573-0205 HEADER 5 WAY STRAIGHT .156P 22573-0206...
  • Page 26 PCB ASSY - 5V/7A MAIN - PL330QMT (44115-0650) Part Number Description Position 22573-0063 HEADER 16 WAY STR SIL (8.4MM) FOR DISPLAY 23185-0220 RES 22RJ W25 CF RD25S B/R 23185-0560 RES 56RJ W25 CF RD25S B/R R10,11,12,13,14,15,16,17 23185-1100 RES 100RJ W25 CF RD25S B/R 23185-2100 RES 1K0J W25 CF RD25S B/R 23185-2470...
  • Page 27 PCB ASSY - 5V/7A MAIN - PL330QMT (44115-0650) continued/... Part Number Description Position 23620-0256 CAP 1U0K 63V P/E P5 23620-9007 CAP 10NK 100V P/E P5 C13,14 23685-0007 CAP 100NK 160V P/P MKP4 P10 25021-0901 DIO 1N4148 B/R D1,2,3,5 25061-9503 DISPLAY - 4 DIGIT LED DISP1 25380-0229 TRAN NPN BC549...
  • Page 28 PCB ASSY - 5V/7A DRIVER - PL330QMT (44115-0660) continued/... Part No. Description Position 23185-1330 RES 330RJ W25 CF RD25S B/R 23185-1470 RES 470RJ W25 CF RD25S B/R 23185-2100 RES 1K0J W25 CF RD25S B/R R18,58 23185-2150 RES 1K5J W25 CF RD25S B/R 23185-2180 RES 1K8J W25 CF RD25S B/R 23185-2220...
  • Page 29 PCB ASSY - 5V/7A DRIVER - PL330QMT (44115-0660) continued/... Part No. Description Position 27106-0513 IC LM358N 27160-0009 IC V/REG 7805 TO220 27230-0530 IC 74HC4053 IC10 35515-1350 PCB - DRIVER - PL 5V/7A PCB ASSY - 5V - PL310QMT (44115-0670) Part Number Description Position 20030-0263...
  • Page 30 PCB ASSY - 5V - PL320QMT (44115-0680) continued/... Part No. Description Position 23185-0470 RES 47RJ W25 CF RD25S B/R R19 23185-1100 RES 100RJ W25 CF RD25S B/R R15 23185-1220 RES 220RJ W25 CF RD25S B/R R9,17,20,37 23185-1470 RES 470RJ W25 CF RD25S B/R R5 23185-2100 RES 1K0J W25 CF RD25S B/R R2,4,6,18 23185-2150...
  • Page 31 PCB ASSY - 5V - PL320QMT (44115-0680) continued/... Part No. Description Position 25130-0231 DIO ZEN 8V2 W4 25130-0903 DIO ZEN 5V1 W4 25130-0913 DIO ZEN 6V8 W4 25341-0214 TRAN PNP ZTX214L/BC559 Q1,4 25380-0229 TRAN NPN BC549 25383-0505 TRAN NPN BC338 Q3,5 25386-9300 TRAN TIP31A...
  • Page 32 a) PCB ASSY SW/B 10MM PL310QMD/QMT (UNIQUE PARTS) b) PCB ASSY SW/B 10MM PL320QMD/QMT " " c) PCB ASSY SW/B 10MM PL330QMD/QMT " " Part Number Description Position_ 23202-2316 RES 3K16F W25 MF 50PPM 23202-2536 RES 5K36F W25 MF 50PPM 23202-3105 RES 10K5F W25 MF 50PPM 23206-0010...
  • Page 33 FRONT PANEL ASSY - PL310/320/330/154 (46115-0600) FRONT PANEL ASSY - PL310QMD/320QMD/330QMD (46115-0490) FRONT PANEL ASSY - PL310QMT (46115-0670) ) - COMMON PARTS FRONT PANEL ASSY - PL320QMT (46115-0780) FRONT PANEL ASSY - PL330QMT (46115-0680) Part Number Description Position 20030-0240 WASHER 4BA ZPST TERMINALS 20037-0247 WASHER 4BA SHK/PROOF I/T ZPST...
  • Page 34 a) FRONT PANEL ASSY - PL310/320/330/154 (UNIQUE PARTS) b) FRONT PANEL ASSY - PL310QMD/320QMD/330QMD " " c) FRONT PANEL ASSY - PL310QMT " " d) FRONT PANEL ASSY - PL320QMT " " e) FRONT PANEL ASSY - PL330QMT " " continued/...
  • Page 35 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 (46115-0770) Part Number...
  • Page 36 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 (46115-0770) continued/...
  • Page 37 COVER - PL330QMT/320QMT 37113-0180 BUTTON, MID GREY ABS 37522-0160 LABEL SER NO - THURLBY-THANDAR (i) INSTRUCTION BOOK Part Number Description 48511-0170 INSTRUCTION BOOK - PL SERIES (ii) MAINS CABLES Part Number Description Type 10175-0110 MAINS LD 3 CORE 24/0.2MM 240V 22491-0200...
  • Page 38 (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) 37559-0380/0390 37559-0410/0400 PL310QMD/QMT PL320QMD 37559-0140/0150 37559-0170/0160 PL320QMT...

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