P-164000477 9395P750 kVA / 900 kVA and 1000 kVA / 1100 kVA 135
Revision 002 User’s and Installation Guide
7.5.19 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 distributed bypass system.
2. Transfer the UPSs to bypass by performing the procedure in Section 7.5.11.
3. Perform the LOAD OFF procedure in Section 7.5.21. The input, output, battery, and bypass
backfeed contactors open, and the power module is turned off.
Power is present inside the UPS cabinet until the upstream input feeder circuit breaker is
opened.
4. If the UPSs contain input breakers (CB1), open all UPS input breakers.
5. Open the input and bypass feeder circuit breakers on all UPSs.
7.5.20 Charger control
To turn the battery charger on:
1 Press the LOCK icon on the main screen. The Sign In screen is displayed. Use operator password
to log in (factory default password is 0101)
2. Select CONTROLS on the main screen. SYSTEM CONTROLS screen opens up.
3. Select EAA CONTROLS.
4. The UPS Charger can be stopped or started by selecting START CHARGER / STOP CHARGER. (To
control the charger of a single UPM, instead of EAA CONTROLS, select MODULE CONTROLS and
then the choose the desired UPM.)
7.5.21 Using the UPS LOAD OFF
A UPS Load Off is initiated by the selecting LOAD OFF from the SYSTEM CONTROLS screen. This de-
energizes the critical load and powers down the UPS. The UPS (including Bypass) remains off until
restarted.
The UPS Load Off controls each UPS independently and does not shut down the whole
distributed bypass system unless all UPSs have been transferred to bypass. To immediately shut
down the whole system, use the REPO switch (see Section 7.5.22).
To u se LO AD OFF:
1 Press the LOCK icon on the main screen. The Sign In screen is displayed. Use operator password
to log in (factory default password is 0101).
2. Select CONTROLS on the main screen. SYSTEM CONTROLS screen opens up.
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