Chapter 2 - Operating Instructions 7400 Series UPS User Manual
One plus One Single Module and One plus One Systems
6310018a.02.doc
2-6
Issue 2
(02/98)
How to totally power-down the system
This procedure should be followed only if the UPS AND LOAD are to be completely powered down.
Step Action Response
1.
Press the Inverter OFF switch (S6) (on both modules
in the one plus one system):
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).
2.
Open the battery circuit breaker:
Mimic panel leds
LS2 should extinguish.
3.
Open the Input Isolator and Static Bypass Isolator.
On 80 - 120 - 200 kVA open auxiliary fuses F1 ... F6
All the operator panel led indications and messages
should extinguish as the mains driven internal
power supplies decay.
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
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,
is fitted in the mains supply line..
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