Operating Procedures - Mitsubishi Electric 2033G Series Owner Technical Manual

MITSUBISHI
ELECTRIC

3.5 Operating Procedures

A) UPS Start-up Procedure
CAUTION : Before the UPS startup, the internal Bypass line starts to supply the
unconditioned bypass input power to the critical load if the External
input Circuit Breaker is closed. Be extremely careful with closing the
External input Circuit Breaker.
1. Close External Input Circuit Breaker (User supplied. Refer to Warning 4 in Section 1.1).
2. Close "CPM" Circuit Protector. Within Twenty (20) seconds, "CB1" AC Input Contactor is
closed, Converter is operated, and then "CB2" DC Input Contactor is closed automatically.
3. The Inverter automatically starts its operation, and then the UPS transfers the power
supply to the critical load without operator intervention from the internal bypass line to
Inverter output. The "INV.OP." LED illuminates.
B) UPS (Inverter) Shutdown Procedure
1. At the time when UPS module (inverter) shutdown is required, press the "STOP" button
on the front panel for (0.3) seconds continuously. LCD Touch Panel Monitor displays a
CAUTION for an acknowledgement for Inverter stop.
2. Repress the "STOP" button on the front panel for (0.3) seconds continuously. The UPS
will transfer the load to the bypass line. The "BYP.OP." LED will illuminate ("INV.OP." LED
disappears).
WARNING : Verify the load is OFF if the next step is to be performed .
NOTE : Power to the critical load is supplied through the bypass line. Power to
the critical load will be lost after execution of the next step. The load will
drop.
3. If turning off all power to the critical load is desired, open the "CPM" Control Circuit
Protector, then open the External Input Circuit Breaker (User supplied.).
CAUTION : In bypass mode, all UPS power terminals are still live. Lethal voltages
are present. De-energize all external sources of AC and DC power.
Before removing the covers, wait 5 minutes after de-energizing. Check
no-voltage before handling UPS. Be careful for the devices even when
the UPS has been de-energized, still internal devices may be hot.
2033G SERIES UPS
OWNERS / TECHNICAL MANUAL
MITSUBISHI ELECTRIC 2033G SERIES UPS
Page Number:
3-6