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Gtec PULSE 1 kVA Service Manual

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GTEC UPS MODEL:
PULSE 1/1,5/2 kVA
SERVICE MANUAL
www.gtec-power.eu

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Summary of Contents for Gtec PULSE 1 kVA

  • Page 1 GTEC UPS MODEL: PULSE 1/1,5/2 kVA SERVICE MANUAL www.gtec-power.eu...
  • Page 2 5. Line and Zero-Crossing Detection ……………………. 6. Inverter Operation ……………………………………….. 7. Active Clamp ……………………………………………….. 8. Microprocessor (CPU) Control Circuit ……………….. 9. Relay Circuit ……………………………………………….. 10. Displays, Audio Alarm and Control Button ……….. 11. Load Detection Circuit …………………………………. 12. Interface Circuit …………………………………………. 13. Troubleshooting ………………………………………… www.gtec-power.eu...
  • Page 3 The output frequency will automatically match the input frequency (50 or 60Hz). Cold start (DC start): The UPS is equipped with DC start function to turn on the UPS without input source. This manual contains block diagram, principle of operation, system outline and troubleshooting. www.gtec-power.eu...
  • Page 4 PULSE 1/1,5/2 kVA service manual 2 Block Diagram The Block diagram of PULSE 1K/1,5K/2K series (refer to Figure S-1) is divided into the following parts: Figure S-1 Block Diagram www.gtec-power.eu...
  • Page 5 It can lower 15% of input voltage: * 0.85 2.4.3 Charger: The battery is charged by the mains through transformer and full-bridge inverter. Line Sense The MCU detect the mains by input voltage and frequency signals converted from the amplifier. www.gtec-power.eu...
  • Page 6 The UPS display device contains one LED (or three-LED or Touch_LCD as option) and one switch. 2.11 Batteries: Acts as a power supply source while the UPS is on battery mode. Different types of batteries are used for different models of UPS: 1K/1,5K/2KVA: 12V7Ah *2 pc or equal capability www.gtec-power.eu...
  • Page 7 The SHUTDOWN network, triggered by pin 2 of the CPU, is used to shutdown the UPS on battery mode. When a battery is in low battery voltage status, the CPU sends a “Low” signal to turn off Q8. This causes Q7 to be turned off and isolates the control power from batteries. www.gtec-power.eu...
  • Page 8 PULSE 1/1,5/2 kVA service manual Figure S-2-1 Control Power Circuit (+12Vdc) Figure S-2-2 Control Power Circuit (+5Vdc) www.gtec-power.eu...
  • Page 9 PULSE 1/1,5/2 kVA service manual Figure S-2-3 AC start Circuit CH1: C16 → GND Figure W-1 Cold Start www.gtec-power.eu...
  • Page 10 4.4 A PWM IC 3843 is used to adjust the charging voltage and charging current. (Refer to Figure S-3-A) The charging voltage can be set by changing the value of R86, R87, and R82. The charging current can be set by changing the value of R66 and R83. Figure S-3-A Charger Control Circuit www.gtec-power.eu...
  • Page 11 PULSE 1/1,5/2 kVA service manual Figure S-3-B Charger Control Circuit www.gtec-power.eu...
  • Page 12 5.2.1 The signal is half-bridge rectified waveform from line input. The voltage drive Q4 (2222ASM) on or off. 5.2.2 The Zero Crossing signal comes from the collector of Q4 and goes through MCU pin 32. 5.2.3 Refer to Figure W-2. The waveform of ZERO-CRO from Q4 collector and Line-I/P. www.gtec-power.eu...
  • Page 13 PULSE 1/1,5/2 kVA service manual Figure S-4 Line and Zero Crossing Detecting Circuit CH1: Q4 collector CH2: Line-I/P Figure W-2 Zero Crossing www.gtec-power.eu...
  • Page 14 LF-DOWN.VGS and RT-DOWN.VGS both get HI simultaneously in battery mode, the step output waveform get approximately zero, which is named CLAMP. In full-bridge circuit, unlike push-pull circuitry having isolated CLAMP circuitry and driven signal, the CLAMP signals are included in inverter drive logic. www.gtec-power.eu...
  • Page 15 PULSE 1/1,5/2 kVA service manual Figure S-5 Inverter circuit Figure W-3 Control logic (1) www.gtec-power.eu...
  • Page 16 The purpose of Clamp is to pull down the output voltage while two sets of Inverter MOSFET are OFF. The Clamp effect is active during the period of 0Vac at battery mode. CLAMP principle is shown in the last paragraph of Chapter 6 Inverter Operation. www.gtec-power.eu...
  • Page 17 Pin19 Pin20 Buzzer control Pin21 Touch clock detection Pin22 Touch sense detection Pin23 I/P_V detection Pin24 O/P_V detection Pin25 Charge control Pin26 Battery voltage detection Pin27 LF-DOWN Pin28 LF-UP Pin29 RT-UP Pin30 RT-DOWN Pin31 Wave DETECTION Pin32 ZERO-CRO control www.gtec-power.eu...
  • Page 18 PULSE 1/1,5/2 kVA service manual Figure S-6 CPU Control Circuit www.gtec-power.eu...
  • Page 19 When the mains input voltage rises beyond buck activated point, CPU pin9 sends a high signal to turn on RY3. When the mains input voltage decreases below the inactivated buck point, the UPS returns back to normal mode by sending a LOW signal from pin9. Figure S-7 Relay Circuit www.gtec-power.eu...
  • Page 20 PULSE 1/1,5/2 kVA service manual CH2: C2 (+) → GND CH1: Output Voltage (1/200V) Figure W-6 Output waveform vs voltage change for relay speed-up circuit www.gtec-power.eu...
  • Page 21 And CPU sends LOW signal to stop buzzer. 9.3 Display (Figure S-8) There are 3 LEDs on Main-board. While control button is turned on, CPU sends a LOW signal to turn on LED. Figure S-8 Display Circuit www.gtec-power.eu...
  • Page 22 10.2 For the different loads，the power factor is different. Thus between the VA value and the Watt value, the load choose most bigger. 10.3 Refer to Figure W-7. The waveform of Load. Figure S-9 Load Detection Circuit Figure W-7 Load Signal Waveform www.gtec-power.eu...
  • Page 23 One or more MOSFETs (Q18, Q26, Q19, Q24, Q21, Q28, Q22 and Q27) are D-S short. Check and replace abnormal. Check if both buzzer beeps and LED flash for once. Check if +5Vdc on CPU pin 4 is normal. www.gtec-power.eu...
  • Page 24 Check if there is current limit phenomenon for DC power supply. Check if the UPS keep at the battery mode. Check if buzzer beeps continuously. Check if battery voltage is too high (overcharge). Replace PCBA. Replace abnormal U3, R86, R87, R65 and R82. www.gtec-power.eu...
  • Page 25 10. Replace PCBA. 11. Check if Line I/P voltage on CPU pin23 is normal. 12. Replace abnormalR118, R104. 13. Check zero-cro on CPU pin32 is normal. 14. Replace abnormal R71,R69,C3 and Q30. 15. Replace PCBA. Figure W-8 Battery Mode Examination Flowchart www.gtec-power.eu...
  • Page 26 PULSE 1/1,5/2 kVA service manual Figure W-9 Line Mode Examination Flowchart www.gtec-power.eu...

This manual is also suitable for:

Pulse 1,5 kvaPulse 2 kva