Liebert 30-130kVA - Manual (Page 41)

Operation
33
3.3.3 Shutdown
To shut down the UPS, navigate to the MAIN MENU, and select STARTUP/SHUTDOWN. This
action will display the STARTUP/SHUTDOWN screen. From there, highlight USER SHUTDOWN
and press SELECT. The following figure will appear.
Figure 30 User shutdown screen
The Operator can invoke two types of shutdowns from this interface screen:
• Transfer Load (Inverter Off). Selecting this option transfers the load to Bypass and turns off the
Rectifier and Inverter.
• Critical Load Shutdown. Selecting this option enables a total system shutdown for purposes of
servicing or repair. The critical load will be dropped once the command is acknowledged by the
controls. Once the Operator has initiated this command, a final warning message will be issued
that “The UPS load will be dumped if you continue.” If accepted (“Continue”), the system will shut
down.
When Operator selects TRANSFER LOAD (INVERTER OFF), the MANUAL TRANSFER/
RETRANSFER screen is displayed. This allows the Operator to transfer the critical load in and out of
the static switch bypass. This screen can be accessed only when the rotary switch is in Normal posi-
tion. The screen is accessed from the MAIN MENU.
Figure 31 Manual transfer / retransfer screen when transfer is allowed
Figure 32 Manual transfer / retransfer screen when transfer is not allowed
USER SHUTDOWN
CRITICAL LOAD SHUTDOWN
EXIT
INVERTER OFF
BYPASS OK
INVERTER OK
INT. BYP. SWITCH NORMAL
EXT. MAINT. SWITCH ON-LINE
INVERTER LAG 1 DEGREE
MANUAL TRANSFER / RETRANSFER
EXIT
TRANSFER TO BYPASS
OK
MANUAL TRANSFER / RETRANSFER
BYPASS NOT OK
INVERTER OK
INTERNAL BYPASS SWITCH NORMAL
EXT. MAINT. SWITCH ON-LINE
TRANSFER NOT ALLOWED
OK EXIT
INVERTER IN SYNC