PowerWalker VFI 20000-40000TAP 3/3 BI, User Manual

Page: 92 / 106

6-18
6.4 Multiple UPS Parallel Operation
Refer to the External Battery Cabinet Installation Manual listed in paragraph 1.8 for
EBC battery breaker location.
Start and control system wide function from UPS 1.
NOTE 1
NOTE 2
6.4.1
Starting the Parallel UPS in Standard Normal Mode (Default Mode)
To start the UPS system:
1. Unfasten the front door by lifting the latch from the bottom and turning to the right (counterclockwise) and
swing the door open (see Figure 6-1).
2. Verify that all input breakers are open.
3. Verify that the maintenance bypass breakers are open.
4. Close all Module Output Breakers (MOBs).
5. Close all UPS input feeder circuit breakers.
6. If the UPSs are wired for dual input, close all of the UPSs Bypass input feeder circuit breakers.
7. Close all input breakers.
8. If the UPSs are wired for dual input, close all bypass input switches.
9. Make sure MBS cover is installed.
10. Close the door and secure the latch.
11. Close all external battery breakers.
12. Observe the UPS control panel display becoming active, indicating logic power.
13. Verify no alarms are active.
14. Select the CONTROLS symbol on the main menu bar. The System Control screen is displayed.
15. If not already selected, select UPS on the System Control screen.
16. On the UPS System Control screen, select the LOAD OFF NORMAL command, then press the
RETURN pushbutton.
17. If requested, enter the Level 1 password. Default password is 1111.
After entering password, UPS will transfer to bypass first and the Bypass LED will illuminate.
All rectifiers and inverters turn on. The inverters continue to ramp up to full voltage.
Once all inverters reach 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. It takes approximately one minute for the
UPS to achieve Standard Normal mode.
The Normal status indicator is illuminated.
The paragraphs in this section provide operating instructions for a UPS system containing multiple UPSs.