OnLine Power Battery Backup System - Manual (Page 44)

OLP
Three Phase UPS Systems
4.0 OPERATION
4-5
(d) Close the (optional) battery breaker – For safety purposes, a fuse is
employed in the battery to the DC bus. Now the battery will take
over to supply the DC bus if the rectifier mains fail.
(e) Push inverter ON switch – To turn on the inverter, the inverter ON switch
( ) and the control switch ( ) must be pressed simultaneously.
The inverter will start working and inverter output will be
established in 4 seconds. The load will automatically be
transferred to the inverter 3 seconds later. Now the UPS is in
normal operation.