TTI QL355 Service Manual
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TTI QL355 Service Manual

Precision power supplies
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QL Series
Precision Power
Supplies
Service Manual
Book Part Number 48511-0670 - Issue 1

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Summary of Contents for TTI QL355

  • Page 1 QL Series Precision Power Supplies Service Manual Book Part Number 48511-0670 - Issue 1...

  • Page 2: Table Of Contents

    Table of Contents Specification Safety General Circuit Descriptions Calibration Parts List Block Diagram Interconnection Diagram Component Layouts Circuit Diagrams...

  • Page 3: Specification

    18°C to 28°C after 1 hour warm-up with no load and calibration at 23°C. Typical specifications are determined by design and are not guaranteed. MAIN OUTPUTS Voltage/Current Ranges: QL355 QL564 0V to 35V/0·001A to 3A 0V to 56V/0·001A to 2A 0V to 35V/0·1mA to 500mA...
  • Page 4 Over-voltage Protection: Range 1V to 40V (QL355), 1V to 62V (QL564) (OVP) Resolution 0·1V; accuracy ± (2% + 0·5V) Response time typically 100µs Over-current Protection: Range 0·01A to 5·5A (QL355), 0·01A to 4·4A (QL564) (OCP) Resolution 0·01A; accuracy ± (0·2% + 0·01A)
  • Page 5 GENERAL AC Input: 230V AC or 115V AC ± 10%, 50/60Hz. Installation Category II Power Consumption: Single: 250VA max. Triple: 500VA max. Operating Range: +5ºC to +40ºC, 20% to 80% RH −40ºC to + 70ºC Storage Range: Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2. Cooling: Intelligent variable-speed fan.
  • Page 6 This instrument has been designed to meet the requirements of the EMC Directive 89/336/EEC. Compliance was demonstrated by meeting the test limits of the following standards: Emissions EN61326 (1998) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use. Test limits used were: Radiated: Class B Conducted: Class B...

  • Page 7: Safety

    Safety This power supply is a Safety Class I instrument according to IEC classification and has been designed to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended for operation from a normal single phase supply.

  • Page 8: General

    General Service Handling Precautions Service work or calibration should only be carried out by skilled engineers using high quality test equipment. If the user is in any doubt as to his competence to carry out the work, the instrument should be returned to the manufacturer or their agent overseas for the work to be carried out. Please note the following points before commencing work.

  • Page 9: Circuit Descriptions

    Bridge rectifier BR1 feeds C4 the reservoir capacitor when tap change is low. When tap change is high, two of the diodes in BR1 are bypassed by SCR1 and SCR2. Voltages are listed below at nominal mains (230V). QL355 35V/3A 15V/5A Secondary –...
  • Page 10 Jumpers are fitted to SEL1 to 7 to inform the microcontroller of the model type and to LK1 and LK2 to power the opto-couplers, see table below. SEL1 SEL2 SEL3 SEL4 SEL5 SEL6 SEL7 QL355 QL355P QL355T output 1 QL355T output 2 QL355TP output 1 QL355TP...
  • Page 11 Auxiliary Output Each transformer has a 4Vrms winding and these are connected in series at the Auxiliary Power pcb. IC3 is an adjustable low drop out regulator. The 3 preset output voltages are achieved by changing the value of R7, by switching resistors in parallel with it. The regulator is turned on by pulling pin 2 low.

  • Page 12: Calibration

    Adjustment is done with the output set to off. Connect an ammeter across the output terminals and adjust VR1 for +1mA. Remove ammeter and connect voltmeter and adjust for VR2 –10mV. (minus or negative 10mV). QL355 Step/Range Settings...
  • Page 13 QL564 Step/Range Settings Adjust for:- Load Detail 1, 56V 2A 0.01V 2A 10mV ± 0.5mV o/p 0V 2, 56V 2A 0.01V 2A 0.010V on display V readback zero 3, 56V 2A 35V 2A 35V ± 0.5mV o/p V span 4, 56V 2A 35V 2A 35.000 on display V readback span...

  • Page 14: Parts List

    Parts List PCB ASSEMBLY – POWER – QL355 (44117-0010) Part Number Description Position 20073-9801 SCREW No.4x1/4in. Plastite HEATSINK FIXING 20613-0026 SIL-PAD 900S 100MM X 25MM FOR SK1,2 20661-0290 SPACER Clr No.4 X 22.2mm Nylon POWER PCB TO COVER 20670-0360 HEATSINK MAXS515 100MM PLAIN...
  • Page 15 PCB ASSEMBLY – POWER – QL355 (44117-0010) continued/… Part Number Description Position 23202-2510 RES 5K10F W60 MF 50PPM R21, 22,132 23202-2560 RES 5K60F W60 MF 50PPM 23202-3100 RES 10K0F W60 MF 50PPM R5, 7-9,13,19, 30,117,120,126,141 23202-3100 RES 10K0F W60 MF 50PPM...
  • Page 16 PCB ASSEMBLY – POWER – QL355 (44117-0010) continued/… Part Number Description Position 25377-5490 TRAN NPN BC549C Q1, 2, 10-12,18, 24 25381-0404 TRAN NPN 2N3904 Q17,21 25383-0505 TRAN NPN BC338 25386-9300 TRAN NPN TIP31A 25601-0590 TRAN MOSFET N CHAN HUF75639G3 Q15,16...
  • Page 17 PCB ASSEMBLY – POWER – QL564 (44117-0100) continued/… Part Number Description Position 22573-0048 HEADER3WAY STR SIL TP2,3,4 22573-0150 HEADER 20 WAY STR LATCHING PJ10,11 22573-0225 HEADER 5 WAY STR F/LOCK .156 22573-0226 HEADER 6 WAY STR F/LOCK .156 22573-0247 HEADER 2 WAY STR .1P F/LOCK 22573-0251 HEADER 6 WAY STR .1P F/LOCK PJ5, 6...
  • Page 18 PCB ASSEMBLY – POWER – QL564 (44117-0100) continued/… Part Number Description Position 23301-0468 RES NETWK SIL 22K X 5 23424-0443 CAP10NZ 1KV CER D10 P5 C12,13 23428-0100 CAP10PG 100V CER NPO P2.5T C56, 57 23557-0500 CAP 1U0 50V ELEC P1.5 C86, 88 23557-0647 CAP 10U 35V ELEC P2...
  • Page 19 PCB ASSEMBLY – POWER – QL564 (44117-0100) continued/… Part Number Description Position 27226-0940 IC 4094B IC28 27231-0000 IC 74HC00 27231-0140 IC 74HC14 27231-5740 IC 74HC574 IC32, 33 27250-1970 IC MCU PIC16F76 IC39 27401-0060 IC 24LC04BP (512x8) SER EEPROM IC31 28151-0010 BUZZER BUZZ1 28500-1160...
  • Page 20 PCB ASSEMBLY – CONTROL (44117-0020) continued/… Part Number Description Position 23215-3130 RES 13K0B W25 MF 15PPM 23215-4150 RES 150KB W25 MF 15PPM R64, 65 23284-0110 RES 0R51J 2W5 WW 23286-0040 RES 0R05J 15W WW ALUM HSD 23385-2220 RES PS/H 2K2 CF 6MM VR1, 2 23427-0388 CAP 220PK 100V CER P2.5...
  • Page 21 PCB ASSEMBLY – CONTROL (44117-0020) continued/… Part Number Description Position 27226-0510 IC 4051B 16 PIN IC13 27227-0210 IC SM 4021 IC36 27227-0510 IC SM 4051 IC25 27227-0750 IC SM 4075 IC18 27227-0940 IC SM 4094 IC11,IC43 27236-0530 IC SM 74HC4053 IC23-24, IC42, IC44 27239-1320 IC SM 74HC132...
  • Page 22 PCB ASSSEMBLY - GPIB INTERFACE (44117-0030) continued/… Part Number Description Position 23557-0657 CAP 100U 10V ELEC RE2 P2 C5-7 23557-0689 CAP 3300U 16V ELEC RE3 P5 C20-21 23595-0010 CAP SM-A 1U0M 16V TANT 25211-9302 RECTIFIER BRIDGE W02G 25377-1000 TRAN SM NPN BC849C Q1-2 27160-0440 IC V/REG LM2940CT5...
  • Page 23 CAP 10NK 100V P/E P5 25061-0200 LED – T1 ROUND (3mm) - RED LED25 25117-0020 DIO 1N5401 35515-1960 PCB - TERMINAL PCB ASSY – IEC INLET – QL355 (44117-0080) Part Number Description Position 23424-0459 CAP 4N7 250V AC CER C85,C88 23684-0008...
  • Page 24 PCB ASSY - AUX TERM/POWER – QL355 (44117-0110) continued/… Part Number Description Position 23202-1240 RES 240RF W60 MF 50PPM R4, R11 23202-1249 RES 249RF W60 MF 50PPM 23202-1430 RES 430RF W60 MF 50PPM 23202-1470 RES 470RF W60 MF 50PPM R13-14...
  • Page 25 MECHANICAL ITEMS - QL355 & QL355P continued/… Part Number Description Position 20038-9501 WASHER M3 SPRING REMOTE SENSE TO TERMINAL, POWER PCB, TERMINAL PCB, F/PANEL BRACKET TO POWER PCB, BARRIER BLOCK, BRACKET GPIB PCB 20038-9502 WASHER M4 SPRING EARTH 20038-9503 WASHER M3.5 SPRING...
  • Page 26 MECHANICAL ITEMS - QL355 & QL355P continued/… Part Number Description Position 22115-0490 TRANSFORMER 22219-0090 SWITCH ROCKER DPST GREY 22315-9502 FUSE 2A ANTISURGE HBC 22467-0010 TERMINAL BARRIER BLOCK 4W 5A REAR PANEL TERMINALS 22520-0200 AC RECEP 10AMP FUSED SNAP-IN 22571-0675 TERMINAL TP/2 RED/GREY 12...
  • Page 27 MECHANICAL ITEMS - QL355T & QL355TP Part Number Description Position 20010-0254 RIVET SNAP-LOCK 4.1D X 5.5T 20030-0240 WASHER 4BA ZPST TERMINAL 20030-0263 WASHER M3 ZPST REMOTE SENSE TO TERMINAL, POWER PCB, TERMINAL PCB, F/PANEL BRACKET TO POWER PCB, BARRIER BLOCK, BRACKET GPIB PCB 20030-0264 WASHER M2.5 ZPST F/PANEL SUPPORT BRACKET...
  • Page 28 INSTRUMENT FOOT BACK FEET 22040-0030 FERRITE SLEEVE APPROX 8/16/14L FOR OUTPUT LEADS, FOR 6 SENSE WIRES, FOR REAR TERMINAL LEADS 22115-0490 TRANSFORMER - QL355 22219-0090 SWITCH ROCKER DPST GREY 22315-9503 FUSE 4A ANTISURGE HBC 230V 22315-0250 FUSE 8A ANTISURGE HBC...
  • Page 29 MECHANICAL ITEMS - QL355T & QL355TP continued/… Part Number Description Position 33143-0290 FOOT - TILT - HOUSING FEET FRONT 33143-0300 FOOT - TILT - SUPPORT FEET FRONT 33147-0270 FRONT MOULDING PTD 33331-8110 OVERLAY TERM/NAM/LOG 33533-0430 LENS - DISPLAY 33533-0440 WINDOW - DISPLAY 33536-4360 CHASSIS - PRINTED 33536-4290...
  • Page 30 MECHANICAL ITEMS - QL564/564P continued/… Part Number Description Position 20234-0012 SCREW M3 X 8 PNHDPZ ZPST F/PANEL TO CHASSIS, FAN TO CHASSIS, REAR BRACKET TO CHASSIS F/PANEL BRACKET TO POWER PCB, BRACKET GPIB PCB 20234-0016 SCREW M4 X 16 PNHDPZ ZPST FEET 20234-0024 SCREW M3 X 16 PNHDPZ ZPST...
  • Page 31 MECHANICAL ITEMS - QL564/564P continued/… Part Number Description Position 22575-0009 SHORTING BLOCK FIT TO SEL 4 & 6 22575-0077 SKT 2 WAY IDT .1P 22575-0205 SKT 5W .156 20AWG (Yellow)IDT TX TO PWR PCB 22575-0206 SKT 6W .156 20AWG (Yellow)IDT TX TO PWR PCB 23557-0506 CAP 10U 63V ELEC P2...

  • Page 32: Block Diagram

    Block Diagram...

  • Page 33: Interconnection Diagram

    Interconnection Diagram Single PSU Triple PSU...

  • Page 34: Component Layouts

    Component Layouts Control Pcb...
  • Page 35 Power Pcb...
  • Page 36 Main Terminal Pcb Auxiliary Power Pcb (Triple only) Auxiliary Terminal Pcb (Triple only)
  • Page 37 Interface Pcb Keyboard/Display Pcb (Single)
  • Page 38 Keyboard/Display Pcb (Triple)

  • Page 39: Circuit Diagrams

    Circuit Diagrams AC Supply Connection Pcb Main Output Front Panel Terminal Pcb...
  • Page 40 Control Pcb Sheet 1of 2 DAC, ADC Sample & Hold ccts, error logic.
  • Page 41 Control Pcb - Sheet 2of 2 Voltage & Current Control, OVP & Sense fault trip.
  • Page 42 Power Pcb (35V/3A) - Sheet 1of 2 Power Output, Internal Supplies, Fan Control, System reset.
  • Page 43 Power Pcb (35V/3A) - Sheet 2of 2 Microcontroller, Keyboard and Display interfaces.
  • Page 44 Power Pcb (56V/2A) - Sheet 1of 2 Power Output, Internal Supplies, Fan Control, System reset.
  • Page 45 Power Pcb (56V/2A) - Sheet 2of 2 Microcontroller, Keyboard and Display interfaces.
  • Page 46 Interface Pcb...
  • Page 47 Auxillary Power - Front panel terminal Pcb (Triple only) Auxillary Power - Power Pcb (Triple only) Keyboard & Display Pcb - Single...
  • Page 48 Output 1 Output 2 Keyboard & Display Pcb - Triple...

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