Transfer a Parallel System from Normal Mode to Maintenance Bypass Mode
- On all UPS displays, select
and then select .The parallel system will transfer to static bypass mode.
- Turn the external maintenance bypass breaker Ext. MBB to
the ON (closed) position.
The load is now supplied via the external maintenance bypass breaker.
- Turn the battery breakers BB of all UPSs to the OFF (open) position.
- Disconnect the battery relay from the display by selecting the battery symbol and selecting and confirm to turn off the battery relay. Verify that the Relay status is now off.
- Open external battery breaker if external batteries are connected.
- Turn the mains input breakers MIB and the bypass input breakers BIB of all UPSs to the OFF (open) position.
- Turn the system isolation breaker SIB to OFF (open) position.
- For the UPS with internal batteries, disconnect all batteries
on the front of the UPS.
DANGERhazard of electrical shock, explosion or arc flash- Wait at least 5 minutes before removing the cover of the UPS after the display has turned off to allow for the capacitors to fully discharged.
- Always measure for hazardous voltages on all terminals before working on the UPS.
Failure to follow these instructions will result in death or serious injury.
