Liebert 7400 Series User Manual

Chapter 2 - Operating Instructions 7400 Series UPS User Manual
One plus One Single Module and One plus One Systems
6310018a.02.doc
2-4
Issue 2
(02/98)
How to turn on the system from a maintenance power-down condition
This procedure should be followed to start the UPS from a MAINTENANCE power-down condition - i.e. where the load is
being initially powered 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. 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 and LS3 should illuminate immediately, to indicate
that the input and bypass supplies are healthy.
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
3. Wait 20 seconds then close the battery circuit breaker: This
is located inside the battery cabinet (if used) or otherwise
adjacent to the battery racks.
Mimic panel leds
LS2 should illuminate.
4. Press the battery metering selector switch [B]: The display should indicate a positive (+) battery
charging current.
5. Press the Inverter OFF pushbutton (S6).
( On both modules for a 1 + 1 system ).
Mimic panel leds
LS4 should extinguish.
6. Close the Output Isolator.
( On both modules for a 1 + 1 system ).
Mimic panel leds
LS5 should illuminate to indicate that the load is
connected to the static bypass line. (On both modules for
a 1 + 1 system).
7.
Open the Maintenance Bypass Isolator (on both modules
in a one plus one system) then Press the Inverter ON
switch (S7) (on both modules in the one plus one system).
(NB: The inverters of both modules are inhibited if either
modules' Maintenance Bypass Isolator is closed.)
Mimic panel leds
LS4 (Inverter OK) and LS6 (Load on inverter) should
illuminate after approximately 30 seconds. (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.).
LS5 should extinguish at the same time as LS6
illuminates.
LS7 (alarm) should extinguish.

Liebert 7400 Series Specifications

General

Brand	Liebert
Model	7400 Series
Category	UPS
Language	English