Emerson 7400 - Manual (Page 25)

16
Series 7400 Single Phase 1+N UPS
How to turn ON the System from a Shut down condition
(Complete this actions on one module at a time)
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 Response
1. Close the module’s Output Isolator
and check that the UPS input mains
supply (and bypass supply if
separate) is turned on externally.
2. Close the input Isolator (and Static
Bypass Isolator, if separate).
3.
Wait 20 seconds then close the
battery circuit breaker: This is
located inside the battery cabinet (if
used) or is otherwise located
adjacent to the battery racks
4. Press the battery metering selector
switch [B].
Mimic panel LEDs LS1 LS3 and LS5
should illuminate immediately, to
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 Busbar reaches its
working voltage (after about 30
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.
The display should indicate a positive (+)
battery charging current.