L. Troubleshooting
WARNING
1.
Troubleshooting can be done by qualified engineer or technician only.
2.
Use isolated AC source for your oscilloscope to prevent floating voltage problem between
UPS chassis ground and system reference ground.
3.
Before opening the cover, turn off the main switch and unplug the input power cord.
4.
Because of some energy will remain in the DC capacitors, wait for at least 5 minutes after
turning off the UPS and disconnecting the power cord before open its cover.
5.
Plug in the input power cord before you reconnect the connectors of battery to prevent
unwanted sparks.
Please depend on the following steps when you want to repair a problematic unit :
1.
Visual inspection
This is the first step to check the UPS after opening its cover. Be sure to do it, it can help you
to identify with most problems. Major items that should be checked are listed below :
(1)
Are there any connectors or terminals loosen ?
(2)
Are there any components burn-out or decolored ?
Especially the power components on the heatsink.
(3)
Are there any capacitors broken or leakage?
Check all the components listed above and replace which is abnormal.
2.
Troubleshooting flowchart
To prevent from damaging yourself and the UPS, be sure to obey the sequences of flowchart
listed below.
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