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STEP 5 (Start-Up Procedure)
When the Module DC Bus voltage is at 100%, you can manually close the module battery disconnect
(MBD) circuit breaker (external to the UPS).
The Battery block in the Monitor/Mimic Display indicates the battery voltage and charge current.
Use the Monitor/Mimic Display screen to determine the condition of the UPS module. Press the
Alarm Reset pad to clear the Alarm Messages. Refer to Table 4 for an explanation of any remaining
alarm messages (except Load on Bypass, which should still be displayed). Call Liebert Global Services
if you cannot clear the remaining alarm messages.
If no alarm messages are displayed besides Load on Bypass, the UPS module is now ready to provide
power to the critical bus.
Refer to 3.4.2 - Load Transfer Procedures to retransfer the load from the bypass line to the UPS
module.
NOTE
The battery charge current may increase quickly, but then should slowly decrease. If you are
recovering from a battery shutdown or an input power failure, the UPS rectifier will be
recharging the battery. Recharge current can be more than 100 Amps. The maximum allowable
recharge current for your unit will depend on the kVA rating and your factory-set battery
recharge current limit.
!
CAUTION
Do not use equalize charging with valve-regulated, lead-acid batteries. Refer to the battery
manufacturer’s manual, available on the manufacturer’s Web site, for specific information
about equalize charging.