Liebert 7400 Series User Manual page 32

Chapter 2 - Operating Instructions
One plus One
This procedure should be followed only if the UPS AND LOAD are to be completely powered down.
Step
1.
Press the Inverter OFF switch (S6) (on both modules
in the one plus one system):
2. Open the battery circuit breaker:
3.
Open the Input Isolator and Static Bypass Isolator.
On 80 - 120 - 200 kVA open auxiliary fuses F1 ... F6
The emergency stop pushbutton is located behind a hinged safety shield to prevent
inadvertent operation. When this switch is pressed modules are electronically shut down and
battery circuit breakers are tripped. Power is removed from the critical load,
but pressing the emergency stop pushbutton will not remove the modules' input mains
supply unless an external contactor, controlled via the emergency stop pushbutton auxiliaries,
2-6
Issue 2
(02/98)
How to totally power-down the system
Action
IMPORTANT
The Maintenance Bypass Isolator may be operated at any time
when the UPS is powered down to connect/disconnect the load
to the raw maintenance bypass supply if required.
Emergency stop
is fitted in the mains supply line..
Single Module and One plus One Systems
6310018a.02.doc
Mimic panel leds
LS4 and LS6 should extinguish, and LS5 should
illuminate to show that the load has been transferred
to the static bypass line. (NB: in a Non-Redundant
Module system LS5 and LS6 will also change-over
on the second module).
Mimic panel leds
LS2 should extinguish.
All the operator panel led indications and messages
should extinguish as the mains driven internal
power supplies decay.
7400 Series UPS User Manual
Response