Emerson 250-400kVA manual Startup commands

Operation

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.

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.

Figure 30 Startup commands

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