Isolate a Single UPS from the Parallel System
Use this procedure to shut down one UPS in a running parallel system.
NOTE: Before initiating this procedure, ensure that the
remaining UPS units can supply the load.
- On the display select
and then select confirm to power off the UPS. - Turn the battery breaker(s) BB of the UPS 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 breaker MIB of the UPS to the OFF (open) position.
- Turn the bypass input breaker BIB of the UPS to the OFF (open) position.
- Turn the external unit output breaker Ext. UOB of the UPS to the 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.
