Emerson 250-400kVA - Manual (Page 31)

Operation
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e. The “Close CB1” message will appear. Close CB1 (see Figure 2)
f. The “Press OK to Issue Rectifier On Command” message will appear. Press “OK”
This will start the UPS’ rectifier. Load is still on internal bypass.
g. The “Press OK to Issue Inverter On Command” message appears. Press “OK”
The motorized Module Output Breaker (CB2) will close. The rectifier will be On and the
Inverter will be on standby. Load is still on internal bypass.
h. The “Press OK to Issue Transfer Command” message appears. Press “OK”
The load is now energized from the UPS Inverter.
NOTICE
Risk of equipment damage.If any abnormal situation occurs during this startup procedure,
open the input circuit breaker and investigate the problem. Call Liebert Services if help is
required.
4. 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.
Figure 30 Startup commands
NOTE
The battery charge current may increase quickly, but then should slowly decrease. If the system
is 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.
!
WARNING
Risk of electric shock, explosive reaction, hazardous chemicals and fire. Can cause equipment
damage, personal injury and death.
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.