Page 24 of 26
Rev. A
10. Check if there is a battery voltage on regulator 7805 input.
11. Check Q11 (MPS2907A), Q12 (2222ASM) and replace them if abnormal.
12. Check there is + 12Vdc on 7805 input.
13. Replace abnormal Q11.
14. Check there is + 5Vdc on U03 (7805)
15. Replace abnormal 7805.
16. Replace PCB
17. Check if buzzer beeps and LED extinguished.
18. Check if battery voltage is correct.
19. Replace abnormal batteries.
20. Check if R17A is normal.
21. Replace abnormal R17A.
22. Replace PCB.
23. Buzzer beeps and LED flash.
24. Check if fault LED lights and buzzer beeps continuously.
25. Check if CPU is shorted.
26. Replace abnormal CPU.
27. Check if the value of R83/ / R82(or R63/ / R86) is correct.
28. Replace R83/ / R82 (or R63/ / R86).
29. Check if Q4, Q9, Q19 (or Q30, Q29 Q15) are ok.
30. Replace Q4, Q9, Q19 (or Q30, Q29 Q15).
31. Replace PCB.
13.7.2
Line mode examination ( please refer to flow chart Figure W- 8)
I f battery mode examination is OK, then do the line mode examination as
below.
1. Plug in input power cord at right voltage range. Check if main relay RY01 is
active.
2. Replace main relay.
3. Check if full-bridge rectifier is short.
4. Replace abnormal diode
5. Check Q14 (2222ASM collector) if there is zero crossing signal.
6. Replace abnormal Q14. Check if UPS remains on line mode.
7. Replace PCB.
8. Check if buzzer beeps continuously and fault LED lights.
9. Check if Buck/ Boost relays (RY02, RY03) are bad.
10. Replace abnormal Buck/ Boost relays (RY02, RY03).
11. Replace PCB.
Summary of Contents for EP450 series
Page 2: ...Page 1 of 26 Rev A UNINTERRUPTIBLE POWER SYSTEM SPECIFICATION EP450 650 850 Series ...
Page 9: ...Page 8 of 26 Rev A Figure S 2 Control Power Circuit CH1 C15 å GND Figure W 1 Cold Start ...
Page 11: ...Page 10 of 26 Rev A Figure S 3 B Charger Control Circuit ...
Page 18: ...Page 17 of 26 Rev A Figure S 6 CPU Control Circuit ...
Page 26: ...Page 25 of 26 Rev A Figure W 7 Battery Mode Examination Flowchart ...
Page 27: ...Page 26 of 26 Rev A Figure W 8 Line Mode Examination Flowchart ...