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HT33 Series User Manual
3.4 Battery Protection
The following functions should be fitted by commissioning engineers with specified software.
1.
Battery Low Pre-warning
The battery undervoltage pre-warning occurs before the end of discharge. After this pre-warning, the
battery should have the capacity for 3 remaining minutes discharging with full load. The time is user
configured from 3 to 60 minutes.
2.
Battery discharge (EOD)off protection
If the battery voltage is lower than the EOD, the battery converter will be shut down. EOD is
adjustable from 1.6V to 1.75V per cell (VRLA) or 0.9 to 1.1 V per cell (NiCd)
3.
Battery Circuit Breaker (BCB) Alarm (Optional)
The alarm occurs when the battery disconnect device disconnects. The external battery connects to
the UPS through the external battery circuit breaker. The circuit breaker is manually closed and tripped
by the UPS control circuit.
