Thomas & Betts 9395 - Manual (Page 61)

UPS 225 - 275 kVA
User’s and Installation Guide
1027212
Revision B 1
5.3.8 Charger control
To turn the battery charger on or off, perform the following procedure:
1. Press the CONTROLS pushbutton on the main menu bar. The System Control screen
appears.
2. Press the pushbutton to display System Controls Screen 2.
3. Press the CHGR ON or CHGR OFF pushbutton on the System Controls menu bar to toggle
the charger on or off.
5.3.9 Using the UPS LOAD OFF pushbutton
A UPS Load Off is initiated by the LOAD OFF pushbutton from the main menu bar or the System
Controls menu bar. This pushbutton can be pressed to control the UPS output. The UPS LOAD
OFF pushbutton de-energizes the critical load and powers down the UPS.
The UPS (including Bypass) remains off until restarted.
To use the LOAD OFF pushbutton:
1. Press the LOAD OFF pushbutton.
The Load Off screen appears, providing a choice to proceed or abort the shutdown.
CAUTION
All power to the critical load is lost when the LOAD OFF is selected in the following step.
You should use this feature only when you want to de-energize the critical load.
2. To shut down the UPS, press LOAD OFF from the Load Off menu bar, and hold for three
seconds. To abort the shutdown, press CANCEL. When LOAD OFF is selected and held for
three seconds, the input, output, and bypass backfeed contactors open, the battery breaker
or disconnect is tripped, and the power module is turned off.
CAUTION
Do not attempt to restart the system after Load Off until the cause of the shutdown has
been identified and cleared.
3. To restart the UPS after pressing the LOAD OFF pushbutton, follow the procedure in
paragraph 5.3.1 or 5.3.2.