Battery Maintenance; Maintenance Byass Mode(Only For Ups With Maintenance Bypass); Troubleshooting - AEG UPS IST3 1-10kVA User Manual

4.6 Battery Maintenance

The working life of battery is based on environment temperature and discharge times. Using battery in
the high temperature for a long time or discharging battery deeply will reduce the working life of battery.
 Charge battery for ten hours before using it. During charging, it can use the battery. If
the battery and charger are powered off at the same time, the discharging time will be
less than the standard value.
 Generally, charge and discharge battery once every four to six months. Discharge
battery till the battery is under-voltage and power it off and then charge it. In the high
temperature area, charge and discharge battery once every two months. The charging
time for the standard battery should be more than ten hours every time.
 If UPS hasn't been used for a long time, it is recommended to charge battery more than
ten hours every three months.
 Generally, the working life of battery is three to five years. If battery failure, replace it
early. The battery replacement should be performed by authorized professional.
4.7 Maintenance Byass Mode(Only for UPS with Maintenance
Bypass)
When it needs to maintain UPS or replace battery, but it can't stop supplying power for load, switch off
UPS and transfer to bypass mode, dismantle the maintenance bypass cover and transfer the
maintenance bypass switch from maintenance bypass to bypass and then switch off mains breaker and
bypass breaker in the rear panel of UPS. Now, AC power draws through maintenance bypass switch to
supply power for load.

4.8 Troubleshooting

It only includes some common fault diagnosis. If any doubt, contact the local office or distributor for details.
Fault phenomenon
The mains is normal. When
starting UPS, it outputs normally.
But it works in the battery mode
and the buzzer beeps
38
Possible reason
1) Check if the contacts and sockets in the input
are with poor contact;
2) Check if the input voltage amplitude or
frequency of mains displayed in the LCD is
(1-10kVA) UPS IST3
User Manual