Operation 91
3.3.1 Start-UpProcedureSCC Start-Up
Whenthe UPS system has been shut down, for any reason, use this procedure to start-up the UPS system to pro-
videfiltered, reliable
powerto the critical load. This procedure givesstep-by-step instructions for controls to operateand conditions to
observe.Your present situation couldbe initial start-up or recovering from input power failure, battery shut-
down,maintenance shutdown, or an emergency shutdown.
Ifyour installation includes a Maintenance Bypass, you may already be supplyingpower to the critical load
equipmentthrough the Maintenance Bypass. If there is no power to the critical load,apply power through the
UPSbypass line per the following procedure.
Duringa start-up procedure, power is supplied to the criticalload through the UPS (internal) bypass line while
theUPS system is being energized. Depending on the reason for your UPS system shutdown,you may already
havepower through the bypass line. You can determinethis by observing the Monitor/Mimic Display screen at
theSystem Control Cabinet (SCC) after Control Power is available.
Step 1. Before you apply power to the UPS modules,determine the position of the following circuitbreakers and
switches:
a. BypassInput Breaker (BIB) - If this circuit breaker is closed, you may alreadyhave power to the
criticalload through the bypass line. If this breakeris closed, leave it closed. If it is open, leave it open
untilyou are ready to energize the bypass line.
b. System Bypass Circuit Breaker (SBB) - This motorized circuitbreaker (Figu re 9) shouldbe closed
unlessyou are recovering from a Remote Emergency Power Off. Youmay already be supplying power
tothe critical load through this breaker. If this breakeris open, you will be instructed to reset it later in
thisprocedure.
c. UPS Output Circuit Breaker -This motorized circuit breaker(see F igure 9) should be open.
d. StaticSwitch Disconnects - These manually operated switches (see Figure 9) will be in the ON
(closed)position unless you are recovering from a shutdown. If theseswitches are OFF (open), you will
beinstructed to reset them and turn them on later in this procedure.
NOTE
Thefollowing procedure assumes that the UPS installationinspection and initial
start-uphave been performed by Liebert Customer Service. A Liebert authorized
representativemust perform the initialsystem start-up to ensure proper system
operation.
CAUTION
The followingprocedure provides power to the critical load distribution system.
Verifythat the critical load distribution is ready to accept power. Make sure that
personneland equipmentare ready for the critica l load distribution system to be
energized.
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.
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PROD U C T