OnLine Power Battery Backup System - Manual (Page 8)

OLP
Three Phase UPS Systems
1. SYSTEM OVERVIEW
1-4
Maintenance Bypass Mode:
In case of UPS maintenance or during battery replacement, and where the load
cannot be interrupted, the user can invoke the static bypass, turn off the inverter,
close the bypass breaker and then open the rectifier and reserve breakers. The AC
output will not be interrupted during the manual bypass transfer procedure. The
maintenance bypass switch keeps continuously supplying power to the load.
Electricity will not exist in UPS power electronic circuitry except for the output
transformer, thus ensuring the safety of service personnel.
The UPS is designed to run 24 Hours a day in normal operation mode once it is
installed, except when the utility power fails, under overload conditions, or during
maintenance.
Normal operation with batteries connected provides clean, stable, regulated and
uninterrupted power to the load, free from any spikes and surges. The UPS is
regarded as a perfect AC power source, limited in back-up time, under mains failure,
only by the capacity of the batteries.