Single Ups Restart; Ups And Critical Load Shutdown - Eaton 93E Operation Manual

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. If input feeder circuit breaker and bypass input breaker is installed customer, close the input feeder circuit
breaker and bypass input breaker.
3. If the UPS contains an input breaker, close the input breaker.
4. If output breaker is installed customer, close the output breaker.
5. Close the external battery breakers.
6. On the UPS being restarted, observe the UPS control panel display becoming active, indicating logic
power.
7 . Verify no alarms are active on the UPS being restarted.
8. On the UPS being restarted, select the CONTROLS symbol on the main menu bar. The System Control
screen is displayed.
9. If not already selected, select UPS on the System Control screen.
10. On the UPS System Control screen, select the UPS OFF
pushbutton.
11. 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. Perform the LOAD OFF procedure in paragraph 6.4.10.
The output contactors open, and the power module is turned off.
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.
4. If the UPSs contain input breakers, open all input breakers.
5. If Bypass input breakers are installed customer, open the Bypass input breakers.
6. If Maintenance Bypass switch is installed customer, open the Maintenance Bypass switch.
7 . Open all Module Output Breakers (MOBs).
8. Open the UPS input feeder circuit breakers.
9. Open all external battery breakers.
NORMAL command, then press the RETURN
WARNING
Eaton 93E UPS (300/400 kVA, 380/400/415V) Installation and Operation Manual
UPS Operating Instructions
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