Xtreme Power Conversion Corporation
E90 Service Manual
Page 37
Uninterruptible Power Supply
Troubleshooting
This chapter provides information that can help you to locate faults with the E90 UPS.
Some data may have to be measured to fix the fault. If it needs to be measured during the operation, the device
should be isolated from the mains. In this case, a transformer can be used between device and the power. It also
applies to the bypass input.
Warning: when UPS works, a large amount of energy is stored in the internal BUS capacitor, it cannot be
guaranteed that there is no electricity inside the UPS with mains isolation, so it needs extra attention when
maintenance. Disconnect all external input power of the fault machine for maintenance. After opening the case,
use the bleed resistor to release the energy stored in BUS capacitor to avoid injury to person.
Before maintenance, please confirm the related reliable cable connection.
For the UPS fault, please record the software version and PCB version correctly.
Warning s and precautions:
When fault occurs, make a note of the display (refer to code table) as the reference for maintenance.
Note: the UPS mains input switch cannot be OFF arbitrarily to avoid electricity interruption.
Fault analysis:
Record the status of display, then fix the reason in accordance with the following questions.
1. The input supply is abnormal? (over/under voltage)
2. Load changes( capacity or type)
3. Fire
4. There’s odor
5. Abnormal noise
6. Bad environment (dust or moisture)
7. High temperature of UPS or ambient environment
Troubleshooting
Failure view:
Please ensure the safe conditions before starting the maintenance. Please read chapter 2 “Security conditions”
and chapter 3 “shutdown-disassembly/reassembly UPS”;
After remove the case, checking the following items:
1. The CONNECTOR or terminals loose
2. The transformer or other parts burst or discoloration especially the power components on the heat sink
3.Capacitor rupture or leak
4.Any parts serious blow up especially power components on heat sink
Solutions:
1. If the unit fails, due to higher probability damage of the INV-POWER board, replace the power board is ok.
2. If any power component on the power board is founded to blow up, replace it according to the “replace PCB”;
3. If fan doesn’t work with mains input, confirm that if the auxiliary power of the INV-POWER board is damaged
and needs to be replaced
4. Charger shows abnormal, check if the charging circuit in the PFC power board is damaged and need to be
replaced.