Table of Contents
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1. Operation Principle ....................................................................... 2
1.1 Principle diagram ................................................................ 2
1.2 Working Mode ..................................................................... 2
1.3 The electrical linking diagram ................................................... 2
2. UPS Structure ........................................................................... 4
2.1 UPS internal structure ............................................................ 4
2.2 The function of PCB .............................................................. 6
The failure UPS debug problem .......................................................... 7
3
3.1 The program explain .............................................................. 7
3.2 The program explain .............................................................. 7
3.2. 1 Ready program ................................................................ 7
3.2.2 Measure the working power supply ................................................ 9
3.2.3 Basic signals test in debugging mode ............................................. 9
3.2.4 signal test under common working condition ...................................... 12
4. The familiar symptom and diagnosis program ............................................... 13
4.1 Abnormal phenomenon 1 ........................................................... 13
4.1. Diagnosis program ............................................................ 13
4.1.2 Program explanation ......................................................... 14
4.2 Abnormal phenomenon 2 ........................................................... 15
4.2.1 Diagnosis program ........................................................... 15
4.2.2 Program explanation ......................................................... 16
Abnormal phenomenon ................................................................. 15
4.3 Abnormal phenomenon 3 ........................................................... 16
4.3.1 Diagnosis program ........................................................... 16
4.3.2 Program explanation ......................................................... 17
4.4 Abnormal phenomenon 4 ........................................................... 17
4.4.1 Diagnosis program ........................................................... 17
4.4.2 Program explanation ........................................................ 18
4.5 Abnormal phenomenon 5 ........................................................... 18
4.5.1 Diagnosis program ........................................................... 18
4.5.2 Program explanation ......................................................... 19
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual
Contents
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Summary of Contents for KEHUA TECH KR-RM Li Series
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Page 1: Table Of Contents
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Contents 1. Operation Principle ............... 2 1.1 Principle diagram ..............2 1.2 Working Mode ..............2 1.3 The electrical linking diagram ........... 2 2. UPS Structure ................4 2.1 UPS internal structure ............4 2.2 The function of PCB .............. -
Page 2: Operation Principle
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual 1. Operation Principle 1.1 Principle diagram Bypass Filter PFC boost Inverter Switch Filter Utility Load Charger Control Display circuit circuit Batteries DC Boost Picture 1： KR-RM lithium-ion UPS series principle diagram 1.2 Working Mode When the mains supply is normal, KR-RM lithium-ion UPS supply DC-AC with mains power through PFC boost voltage , output a stable 230Vac to DC voltage and the mains supply recharge the battery in the meantime. - Page 3 KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual KR-RM Li 1000VA electric diagram KR-RM Li 2000~3000 electric diagram...
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Page 4: Ups Structure
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual KR-RM Li 2000G~3000G electric diagram 2. UPS Structure 2.1 UPS internal structure... - Page 5 KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Communication interface board Power amplifier board battery Main control board Power supply big charger board LCD board Picture 4 KR-RM Li 1000 Communication interface board Power amplifier board battery Main control board LCD board big charger Picture 4...
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Page 6: The Function Of Pcb
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Communication interface board Power amplifier board battery Main control board LCD board big charger Picture 7 KR-RM Li 2000G~3000G 2.2 The function of PCB A. Main board Turn on & off control, produce inverter drive signal, panel display and button control, sample measure of invert load and mains voltage, control of output &... -
Page 7: The Failure Ups Debug Problem
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual 3 The failure UPS debug problem 3.1 The program explain Start Ready Replace power Is the boost driving amplifier board signal normal？ Is inverter driving signal on inverter driving signal Replace Power amplifier board Main... - Page 8 KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual B. Wait for the 5 min, discharge UPS high voltage of the capacitor, or use appropriate resistance(for example 47 Ω/10 W) to discharge the capacitor until the voltage is less than 5 V, as shown in figure 9 (attention, the UPS inside is still existing dangerous high voltage before being discharged);...
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Page 9: Measure The Working Power Supply
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Picture 10: Main board connector CN1 3.2.2 Measure the working power supply turn on AC input breaker; tap the "ON" button(less than 1s) , then the power supply circuit will work, but the UPS is still in off mode. - Page 10 KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual 3.2.3.2 DC BUST voltage testing in battery mode the DC BUS voltage should be as below, the Voltage difference between +BUS and -BUS should be lower than 10V. the buzzer will alarm 3 times per 10s BUS+(C7-1 BUS-(C6-1P) BUS+(C30-1P)
- Page 11 KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual 3.2.3.4 DC BUS voltage test in mains mode turn off UPS and DC input breaker, adjust the AC input voltage to 110±2V. turn on AC input breaker and DC input breaker, turn on the UPS. check the DC BUS voltage and AC output voltage as below: JP7(LOUT) to JP3(BAT-) JP8(LOUT) to J65(BAT-) 1kVA...
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Page 12: Signal Test Under Common Working Condition
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual driving signal of driving signal 1kVA 18.0±2.0V -5±0.5V 18.60±0.5kHz 2-3kVA 18.0±2.0V -5±0.5V 18.60±0.5kHz the driving signal waveform is Q2/Q3 on 2-3kva UPS and Q3/Q6 on 1kva UPS as below: the driving signal waveform is Q4/Q5 on 2-3kva UPS and Q4/Q5 on 1kva UPS as below: 3.2.4 signal test under common working condition 3.2.4.1 inverter output waveform testing in battery mode... -
Page 13: The Familiar Symptom And Diagnosis Program
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual 2-3kVA 220±5Vac 3.2.4.2 DC BUS voltage test in battery mode using a multi-meter to measure the DC BUS voltage, the voltage should be 380±10V, and Buzzer alarms 3 times per 10s; 3.2.4.3 DC BUS voltage test in mains mode turn on AC input breaker, add 220±2Vac AC input voltage, UPS transfers to mains mode, Buzzer stops alarm;... -
Page 14: Program Explanation
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Mains break down Charge function Charge circuit usually makes battery normal？ damage？ lack of charge Change Take measures(eg. Change charge power Generator) to make board or power DC Boost circuit amplifier sure battery full amplifier board... -
Page 15: Abnormal Phenomenon 2
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual high temperature & unstable electronic net. ② Actual test: Over ten hours’ normal charge, turn off the breaker of battery, measure the batteries voltage. For the KR-RM Li 1000L, if the battery voltage is lower than 30VDC, that maybe batteries ageing. -
Page 16: Program Explanation
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual UPS function test 4.2.2 Program explanation ① Judge whether the mains input voltage and frequency is normal: use the multimeter to measure the UPS input, the input voltage should be 120～295Vac（half load should be 140~295Vac, full load should be 160~295Vac）, frequency should be 47.5～52.5Hz（or 45~55Hz）. -
Page 17: Program Explanation
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Whether the boost According to 3.2 process and invert damage in the manual the Control circuit fail? Replace the main board UPS function test 4.3.2 Program explanation A. Over load judge: Do as 4.1.2 B. -
Page 18: Program Explanation
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Load sensitive ， add flitter output terminal UPS function test 4.4.2 Program explanation A. Judge whether the ground electrode is normal: use the multimeter to measure the voltage between input neutral and ground of UPS input terminal, if it is OK, the neutral voltage should lower than 5Vac. -
Page 19: Program Explanation
KR-RM Li 1-3KVA lithium-ion UPS series maintenance manual Reduce load UPS function test 4.5.2 Program explanation A. Ventilator position: show as each construction picture of the UPS. B. Output wave form distortion judge: use oscillograph to test the output waveform, it should be standard sine wave normally.
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