Liebert Series 600T - Manual (Page 105)

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 Figure 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.
SHUTDOWN PROCEDURES
1. If load is not already being supplied by the bypass line, select the
"LOAD TRANSFER PROCEDURE" screen and follow the instructions to transfer
the load to bypass.
2. Go to the modules(s) and follow the module "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 Press the ALARM RESET button to clear alarms which are no longer active.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 switch disconnect
circuit breakers.
5. Wait approximately two (2) minutes before attempting any other action .