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Operation 91
3.3.1 Start-Up Procedure
SCC Start-Up
When the UPS system has been shut down, for any reason, use this procedure to start-up the UPS system to pro-
vide filtered, reliable
power to the critical load. This procedure gives step-by-step instructions for controls to operate and conditions to
observe. Your present situation could be initial start-up or recovering from input power failure, battery shut-
down, maintenance shutdown, or an emergency shutdown.
If your installation includes a Maintenance Bypass, you may already be supplying power to the critical load
equipment through the Maintenance Bypass. If there is no power to the critical load, apply power through the
UPS bypass line per the following procedure.
During a start-up procedure, power is supplied to the critical load through the UPS (internal) bypass line while
the UPS system is being energized. Depending on the reason for your UPS system shutdown, you may already
have power through the bypass line. You can determine this by observing the Monitor/Mimic Display screen at
the System Control Cabinet (SCC) after Control Power is available.
Step 1. Before you apply power to the UPS modules, determine the position of the following circuit breakers and
switches:
a. Bypass Input Breaker (BIB) - If this circuit breaker is closed, you may already have power to the
critical load through the bypass line. If this breaker is closed, leave it closed. If it is open, leave it open
until you are ready to energize the bypass line.
b. System Bypass Circuit Breaker (SBB) - This motorized circuit breaker (Figure 9) should be closed
unless you are recovering from a Remote Emergency Power Off. You may already be supplying power
to the critical load through this breaker. If this breaker is open, you will be instructed to reset it later in
this procedure.
c. UPS Output Circuit Breaker - This motorized circuit breaker (see Figure 9) should be open.
d. Static Switch Disconnects - These manually operated switches (see Figure 9)willbeintheON
(closed) position unless you are recovering from a shutdown. If these switches are OFF (open), you will
be instructed to reset them and turn them on later in this procedure.
NOTE
The following procedure assumes that the UPS installation inspection and initial
start-up have been performed by Liebert Customer Service. A Liebert authorized
representative must perform the initial system start-up to ensure proper system
operation.
CAUTION
The following procedure provides power to the critical load distribution system.
Verify that the critical load distribution is ready to accept power. Make sure that
personnel and equipment are ready for the critical load distribution system to be
energized.
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.