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STEP 1 (Start-Up Procedure)
Before you apply power to the UPS modules, determine the position of the following circuit breakers
and switches:
a. Rectifier Input Breaker (RIB) - If this external circuit breaker is closed, you already have
power to the UPS cabinet and possibly power to the controls. If this breaker is closed, leave it
closed. If it is open, leave it open until you are ready to apply power to the UPS cabinet.
b. Bypass Input Breaker (BIB) - If this external 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.
c. Input Circuit Breaker (CB1) - Verify that this breaker on the front of the UPS cabinet
(Figure 3) is in the OFF position.
d. Module Battery Disconnect (MBD) - Verify that this external breaker is open or tripped. If
you are using battery cabinets, verify that breakers on all the cabinets are open.
e. Bypass Circuit Breaker - This motorized circuit breaker (Figure 50 or Figure 51) 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 after Control Power is available.
f. Output Circuit Breaker - This motorized circuit breaker (Figure 50 or Figure 51) should
be open.
g. Static Switch Disconnect Fuses - A pair of fuses labeled Static Disconnect (typically F21
and F22) is located near the static switch assembly. These fuses should be ON (pushed in)
unless the system is recovering from a shutdown.
h. Control Power - The fuses labeled Control Disconnect should be ON (pushed in) unless you
are recovering from a maintenance shutdown. If control power is OFF (fuseholders pulled
open), leave it OFF until you are ready to apply power to the UPS controls.
STEP 2 (Start-Up Procedure)
Power must be provided to the UPS controls so the operator can use the LCD and so the system logic
can perform its control functions. Note that you can use the LCD to monitor UPS system status, even
when the UPS modules are not operating. This will be the usual condition unless you are recovering
from a maintenance shutdown.
If the LCD screen is not operating, energize Control Power by operating the following two controls:
a. Close the Rectifier Input Breaker (RIB) which is outside the UPS cabinet. This will provide
power to the UPS cabinet but not to any UPS components.
b. Open the UPS cabinet door and verify that the two fuseholders marked Control Disconnect
are ON (pushed in). If not, push in both fuseholders now to turn Control Power ON. Close the
UPS cabinet door.
NOTE
If the system was shut down in response to an “Emergency Off,” there may be alarm messages
on the LCD screen that describe system conditions before (or at the time of) the shutdown. Some
or all of the alarm conditions may have already been resolved. To clear these alarm messages,
turn off the control power (see Figures 3 andFigures 4). Wait at least ten minutes for the
control power circuitry to completely de-energize. After ten minutes, turn control power back on
and wait two minutes before continuing.
!
CAUTION
If you are recovering from a UPS system shutdown for maintenance procedures, verify that all
of the UPS system doors are closed and latched. All test equipment must be removed from the
system. All electrical connections must be secure.
NOTE
Wait two minutes after applying Control Power before you operate any other UPS controls.