Emerson 7400 Series User Manual page 25

Series 7400 Single Phase 1+N UPS
How to turn ON the System from a Shut down condition
This procedure should be followed when turning on the one-plus-one system from a
fully powered down condition - i.e. where the load is not being initially supplied through
the internal Maintenance Bypass supply.
Step Action
1. Close the module's Output Isolator
and check that the UPS input mains
supply (and
separate) is turned on externally.
2. Close the input Isolator
Bypass Isolator, if separate).
3. Wait 20 seconds then close the
battery circuit
located inside the battery cabinet (if
used) or
adjacent to the battery racks
4. Press the battery metering selector
switch [B].
(Complete this actions on one module at a time)
bypass supply
(and Static
breaker: This
is otherwise located
Response
if
Mimic panel LEDs LS1 LS3 and LS5
should illuminate
indicate that the load is being supplied
through the static bypass line
(Note: In a Redundant Module system LS5 will
not illuminate on the second module to be
started as its static bypass line is inhibited).
The inverter should start automatically
once the DC
working voltage
seconds), and when this occurs LS4
(inverter OK) will illuminate followed by
LS6 (load on inverter).
(Note: In a Non-Redundant module system
LS6 will not illuminate on the first module to
be started until you reach this point in starting
the second module.)
Note that LS5 will extinguish when LS6
illuminates.
Mimic panel LED LS2 should illuminate
and LS7 (alarm) should extinguish.
is
The display should indicate a positive (+)
battery charging current.
immediately, to
.
Busbar reaches its
(after about 30
16