Chapter 2 - Operating Instructions 7400 Series UPS User Manual
One plus One Single Module and One plus One Systems
6310018a.02.doc
2-3
Issue 2
(02/98)
When shutting down the second module, the static bypass lines of both
modules will be turned on as soon as its inverter is stopped. That is, both
modules will provide load power through their paralleled bypass lines.
Starting:
In a Non-Redundant module system both modules must be running
before the load is transferred to their paralleled inverters. Therefore,
when the first module is started, the load will remain connected to its
static bypass line while waiting for the second module to synchronise.
Stopping:
The load will be transferred to the static bypass lines in both modules
simultaneously as soon as the inverter stops in the first module to be shut
down.
How to turn on the system from a shutdown condition
This procedure should be followed when turning on the UPS from a fully powered down condition - i.e. where the load is not
being initially supplied through the internal Maintenance Bypass supply.
Note: For a one plus one system, complete these actions on one module at a time.
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 .
Mimic panel leds
LS1 LS3 and LS5 should illuminate immediately, to
indicate that the load is being supplied through the static
bypass line. (NB: In a one plus one 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 d.c.
Busbar reaches its working voltage (after about 30
seconds), and when this occurs LS4 (inverter OK) will
illuminate followed by LS6 (load on inverter). (NB: In a
one plus one 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.
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
Mimic panel leds
LS2 should illuminate on the mimic panel and LS7
(alarm) should extinguish.
4. Press the battery metering selector switch [B]: The display should indicate a positive (+) battery
charging current.
2.2.2 Non-Redundant
module system
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