Single Ups Restart; Ups And Critical Load Shutdown - Eaton 9E Installation And Operation Manual

UPS Operating Instructions

6.4.6 Single UPS Restart

To restart a single UPS from a shutdown state:
1. Close the MOB for the UPS being restarted.
2. Close the UPS input and, if installed, bypass feeder circuit breakers for the UPS being restarted.
3. If the UPS contains an input switch, close the input switch.
4. If the UPS contains a bypass input switch, close the bypass input switch.
5. If the UPS contains an output switch, close the output switch.
6. Close the external battery breakers.
7 . On the UPS being restarted, observe the UPS control panel display becoming active, indicating logic
power.
8. Verify no alarms are active on the UPS being restarted.
9. On the UPS being restarted, select the CONTROLS symbol on the main menu bar. The System Control
screen is displayed.
10. If not already selected, select UPS on the System Control screen.
11. On the UPS System Control screen, select the UPS OFF
pushbutton.
12. If requested, enter the Level 1 password. Default password is 1111.
The rectifier and inverter turn on. The inverter continues to ramp up to full voltage.
Once the inverter reaches full voltage, the UPS output contactor closes and the static switch turns off.
Power is now supplied to the critical load in Standard Normal mode along with the other UPSs online. It
takes approximately one minute for the UPS to achieve Standard Normal mode.
The Normal status indicator is illuminated.

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 contactors open.
Power is present inside the UPS cabinets after the upstream input feeder circuit breakers are
opened because of the installed external battery cabinet.
5. If the UPSs contain input switches, open all input switches.
6. If the UPSs contain bypass switches, open all of the bypass switches.
7 . If the UPSs contain an output switch, 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
6-20 Eaton 9E UPS (80-200 kVA, 380/400/415V) Installation and Operation Manual
NORMAL command, then press the RETURN
WARNING