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Chapter 6 Maintenance
78
Cable and connectors: Check whether the cable is aged, damaged or burnt; check
whether the connector of the PCB is secure;
PCB: Check the cleaness and completeness
7
）
Use vacuum pump to clear the dirt on the surface;
8
）
Switch on the UPS again and let the inverter powers the load according to the
start-up process of UPS;
9）If necessary, switch off the Q1, check the battery backup time, switch on Q1
when the battery voltage is higher than the end of discharge voltage by 5V(Note:
The end of discharge voltage is 300Vdc. When the battery voltage reaches 300Vdc,
the battery input contactor will disconnect and the load will transfer to bypass ), and
record the backup time.
4. Other checking
1）Check the insulation sleeve of input/output cables and the connectors: check
periodically and the UPS should be switched off when checking. The checking
interval should not be longer than 2 years;
2
）
Lightning protection checking: Check according to the methods of weekly
checking because you can only check the indicator of lightning protection device by
opening the door. Check each day in wet seasons or the seasons with lots of
thunders. Check the lightning device in time when lightning occurs nearby to find
problems in time.
6.2.2 Battery maintenance
The internal battery of iTrust series UPS is a sealed, lead-acid, maintenance-free
battery. The battery life depends on the ambient temperature, charge and discharge
times. High ambient temperature and deep discharge will shorten battery life.
1 battery storage
To ensure battery life, the battery should be maintained regularly:
1
）
Check the battery state periodically. Keep the battery room and battery cabinet
clean. Clear the oxidization objects at the terminal or connection bar periodically
and apply some butter. Tighten the loose screws and keep the battery well
connected to prevent big voltage drop during discharging.
2）Check the battery insulation every 2-3 months. Check the total battery voltage
once a week. Use the automatic battery management function to charge the battery
whose voltage is low. Clean the leakage solutions periodically.