Charger Control; Ups And Critical Load Shutdown - Eaton 93E MK2 Installation And Operation Manual

6.4.7 UPS and Critical Load Shutdown

To perform maintenance or service on the critical load, shut down power to the load:
1. Turn off all equipment that is being powered by the UPS parallel system.
2. Transfer the UPSs to bypass by performing the procedure in paragraph 6.4.3.
3. Perform the LOAD OFF procedure in paragraph 6.4.10.
The output and bypass backfeed contactors open, and the power module is turned off.
4. Perform the battery charger off procedure in paragraph 6.4.8 for each UPS.
The input and battery relay open.
WARNING
Power is present inside the UPS cabinets after the upstream input feeder circuit breakers are opened because
of the installed external battery cabinet.
5. Open all input switches.
6. Open all of the maintenance bypass switches.
7 . Open the output switch.
8. Open all of the MOBs.
9. Open all of the UPSs input and bypass feeder circuit breakers.
10.Open all external battery breakers

6.4.8 Charger Control

To turn an individual UPS battery charger on:
1. Select the CONTROLS symbol on the main menu bar on the UPS requiring the charger to be turned on. The
System Control screen is displayed.
2. Select Battery on the System Control screen
3. On the Battery System Control screen, select the RESTING CHARGING command, then press the
RETURN pushbutton.
To turn an individual UPS battery charger off:
1. Select the CONTROLS symbol on the main menu bar on the UPS requiring the charger to be turned off. The
System Control screen is displayed.
2. Select Battery on the System Control screen.
3. On the Battery System Control screen, select the CHARGING RESTING command, then press the RETURN
pushbutton.
71 Eaton 93E MK2 UPS (10-40kVA, 380/400/415V) Installation and Operation