Powercom 400 - Manual (Page 8)

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flash and buzzer will be slowly beeping.
3.4.2 Turn on the computer, if it is over loaded, the LED and buzzer will
rapidly flash and beep, you should check the power rating of the loaded
equipment then remove the less critical one. Generally, the total power
consumption of one set of personal computer (color monitor) will not
exceed the rating of this UPS.
3.4.3 Unplug the input power cord to test the UPS backup function.
The LED and buzzer will be slowly flash and beeping. The computer or
other equipment shall still work well, without any malfunctions or
reset action.
3.4.4 Reapply the line power to the UPS, the UPS shall return to line mode
in 2 seconds.
3.4.5 Keep line power applied continuously to the unit for at least 5 hours to
ensure battery is fully charged.
3.5 Backup operation
If the line power is outage or input voltage is too high or too low, the UPS
will transfer to battery mode. The back up time should be about 10 minutes
for one set computer, if the back up time is less than 3 minutes, and the UPS
have been long time charged, the battery is not good enough and better to
replace with a new one.
4 MAINTENANCE
The unit is designed for years of trouble-free operation, so only a little maintenance
is required.