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28 User Guide APC Silcon 240-320kW 400V UPS
990-4057
Maintenance & Testing
6.0 Maintenance & Testing
UPS maintenance should be carried out by trained service engineers only. Service and
maintenance contract is recommended.
6.1 Fan
It is recommended to replace fans every 3 years.
6.2 Battery Monitoring Test
Systems with built-in batteries have a standard battery monitoring feature (optional in other
systems).
Battery Test Results:
1. Battery OK. Back-up time normal.
2. Reduced battery capacity - “Battery weak” message appears.
3. Battery capacity too low - “Battery defective” message appears.
Carry out battery monitoring test by discharging max. 25% of battery energy. For systems with
no battery monitor/no excess back-up time, a battery capacity test is recommended every 6
months.
Carry out battery tests when load is least affected.
6.3 Battery Capacity Test
CAUTION!
Allow 16 hours to restore full back-up time after battery capacity tests.