Mitsubishi Electric 9900B Series Owner Technical Manual page 59

MITSUBISHI
ELECTRIC
B) Shutdown Procedure
If a total UPS shutdown is required, verify that the critical load is OFF.
a) On the LCD panel, select the "OPERATION" tab, and then press the "SHUTDOWN
GUIDANCE" icon to continue the UPS shutdown (refer to Figure 2.3).
b) Follow the "SHUTDOWN GUIDANCE" accordingly. During the procedure, the UPS will
transfer the power feeding from the Inverter supply to the Bypass line supply.
c) Both the Converter and Inverter will remain energized until complete disconnection
from all power sources.
NOTE: When "REMOTE OPERATION MODE" is displayed on the LCD panel, the
inverter start operation can only be performed remotely. If local inverter
stop operation is required at the UPS, select "LOCAL ONLY" or "REMOTE
& LOCAL" in the OPERATION MENU.
d) If stopping both the Inverter and Converter is required, open the Battery Disconnect
circuit breaker (CB2) manually in accordance with guidance.
WARNING: Verify that 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
e) If a dual source is feeding the UPS, open the External AC Input Circuit Breaker (user
supplied) manually.
f) If turning off all power to the critical load is desired, open the External Bypass Input
Circuit Breaker (user supplied) manually.
CAUTION: In bypass mode, all UPS power terminals are still live. Lethal voltages
9900B SERIES UPS
OWNERS / TECHNICAL MANUAL
to the critical load will be lost after execution of the next step. The
load will drop.
are present. De-energize all external sources of AC and DC power.
Before removing the covers, wait 5 minutes after de-energizing.
Check that no voltage is flowing before handling the UPS. Be careful
even when the UPS has been de-energized; internal devices may still
be hot.
MITSUBISHI ELECTRIC 9900B SERIES UPS
Page Number:
3-16