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Operation 99
3.3.3 Shutdown Procedures
System Shutdown Procedure
Perform a System Shutdown Procedure when you want to remove power from the UPS system and System Con-
trol Cabinet (SCC) when required for maintenance, or if you need to perform maintenance on a UPS module in a
non-redundant system.
Before performing any maintenance on your Liebert Series 600T UPS, observe ALL of the WARNINGS in
4.0 - Maintenance.
Use the SCC Monitor/Mimic Display to determine the operating condition of the UPS system.
From the SCC Master Menu, select the Shutdown Procedures screen.
Figure 62 SCC Shutdown Procedures Screen
Step 1. If the UPS system is supplying power to the load (Load On UPS), select the Load Transfer Procedures
screen at the SCC and perform a manual transfer to the bypass line (Load On Bypass). This will open the motor-
ized UPS Output circuit breaker (see Fig ure 9) and close the motorized System Bypass circuit breaker (SBB,
Figure 9).
Step 2. If maintenance is required on the Static Bypass Switch, set the Static Switch Disconnects to OFF (open).
Refer to Figure 9.
NOTE
Depending on SCC model, the static switch disconnects can be two circuit breakers,
contactors, or plug-in connections on a drawout carriage assembly. The location
could be at the front, right, or rear of the cabinet. Refer to the drawing of the SCC
cabinet selected for your UPS system.
CAUTION
The UPS bypass line is still energized.
SHUTDOWNPROCEDURES
1. Ifloadis notalreadybeing supplied bythebypass line, selec t the
"LOADTRANSFERPROCEDURE"screenand follow theinstructions to transfer
theloadto bypass.
2. Go tothe modules(s)and follow the module "SHUTDOWNPROCEDURES. "
3. Press theALARM RESETbuttonto clearalarms which areno longeractive.
4. Ifnecessaryfor maintenance purposes, openthestatic switch disconnect
circuitbreakers.
5. Wait approximatelytwo(2)minutes beforeattempting anyotheraction.
DISCONTINUED
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