OPTI-UPS DS160KD33 - Manual (Page 8)

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Maintenance Bypass Mode:
In case of UPS maintenance or battery replacement, and the load cannot be
interrupted, the user can turn off the inverter, close the bypass breaker and then
open the rectifier and reserve breakers. The AC output will not be interrupted during
manual bypass transfer procedure. Therefore maintenance bypass switch keeps
continuously power supply to the load. Electricity will not exist in UPS except the
output transformer, thus ensure the safety of service personnel.
Generally, the UPS is expected to run 24 Hours a day in normal operation mode
once it is installed, except when the utility power is fail, under overload condition,
or during maintenance.
The normal operation with battery connected can provide a clean, stable, free from
any spikes and surges, regulated and uninterruptible power to the load. Therefore,
the UPS and be regarded as a perfect AC power source except the back-up time
under mains failure is limited by the capacity of battery connected.