Operation 99
3.3.3 Shutdown ProceduresSystem Shutdown Procedure
Performa System Shutdown Procedure when you want to remove power from the UPS system and System Con-
trolCabinet (SCC) when required for maintenance, or if you need to perform maintenance on a UPS module in a
non-redundantsystem.
Beforeperforming any maintenance on your Liebert Series 600T UPS, observe ALL of the WARNINGS in
4.0- Maintenance.
Usethe SCC Monitor/Mimic Display to determine the operating conditionof the UPS system.
Fromthe SCC MasterMenu, select the Shutdown Procedures screen.
Figure 62 SCC Shutdown Procedu res Screen
Step 1. If the UPS system is supplying power to the load (Load On UPS), select the Load TransferProcedures
screenat the SCC and perform a manual transfer to the bypass line (Load On Bypass). This will open the motor-
izedUPS Output circuit breaker (see Figure 9) and close the motorized System Bypass circuit breaker (SBB,
Figure 9).
Step 2. If maintenanceis required on the Static Bypass Switch,set the Static Switc h Disconnects to OFF (open).
Refer to Figure 9.
NOTE
Dependingon SCC model, the static switch disconnects can be two circuitbreakers,
contactors,or plug-in connections on a drawout carriage assembly.The location
couldbe at the front, right, or rear ofthe cabinet. Refer to the drawing of the SCC
cabinetselected for your UPS system.
CAUTION
The UPS bypass line is still energized.
SHUTDOWNPROCEDURES
1. If load is not already being supplied by the bypass line, select the
"LOADTRANSFER PROCEDURE" screen and follow the instructions to transfer
theload to bypass.
2. Go to the modules(s) and follow the m odule "SHUTDOWN PROCEDURES."
3. Press the ALARM RESET button to clear alarms which are no longer active.
4. If necessary for maintenance purposes, open the static swi tch disconnect
circuitbreakers.
5. Wait approximately two (2) minutes beforeattempting any other action .
DISCONTINUED
PROD U C T