OnLine Power Battery Backup System - Manual (Page 42)

OLP
Three Phase UPS Systems
4.0 OPERATION
4-3
(b) Open the (optional) battery breaker – If you want to shutdown all the
power of the UPS, continue to open the battery breaker. Now the
DC bus is only supported by the rectifier.
(c) Open the rectifier breaker – Opening the rectifier breaker will further take
the power source away from the DC bus, and the DC bus will start
to drop slowly. After 5 minutes, the DC bus will drop to a safe
level (< 20VDC).
(d) Open the reserve breaker – Before opening the reserve breaker, power
exists at the output. After opening the reserve breaker, the output
(or load) will no longer have power. Therefore, before opening
the reserve breaker, insure there is no critical load connected to
the output.
(e) If there is input breaker, open it accordingly.
(f) At this point, all power has been cut off, and there should none of the
LED’s or LCD’s lit. The UPS now is completely shut off.
4.3. From Inverter to Maintenance Bypass Procedure
If it is necessary to stop the UPS for maintenance and but not stop the power
supplied to the load, follow the steps below to turn the UPS to maintenance
bypass mode without interrupting the output power supply.
(a) Switch off the inverter – The inverter can be switched off by pressing the
inverter OFF switch ( ) a n d t h e c o n t r o l s w i t c h ( )
simultaneously. The load will be automatically transferred to
reserve without interruption.
(b) Open the (optional) battery breaker – You have to shutdown the power
inside the UPS. Therefore, continue to open the battery breaker.