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AMATRONIC
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LECTRONIC
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CENTRIC 3x480, User Guide, rel. 1.7
9
2.8
Emergency Power Off – EPO (manual)
An external Emergency Power Off (EPO) switch may be installed on the
Centric
by the customer. The
EPO switch is used to cut power to the load in emergency situations. Refer to the section "Emergency
Power Off" in the
Centric Installation Guide
for further information.
2.8.1
EPO indication
Any of the output dry contacts can be assigned to indicate when the EPO switch has been activated. The
output dry contact can be used to trigger an external circuit if desired, such as a lamp or an audible alarm.
2.8.2
Battery trip coil dry contact
The Centric’s battery trip coil terminals are intended to be connected to the trip coil of the battery circuit
breaker. When this is done and the EPO switch is activated, the
Centric
sends a voltage pulse to the
battery circuit breaker trip coil, causing the battery circuit breaker to turn OFF. The battery circuit breaker
trip coil is rated for a maximum of 250 Vac, 12 A.
Use of the battery trip coil means that not only will use of the EPO switch cut all ac output from the UPS, it
will also turn off the battery circuit breaker. Refer to the section "Battery trip coil" in the
Centric Installation
Guide
for further information.
2.8.2.1
RESTARTING THE UPS AFTER EPO
After the emergency situation that prompted use of the EPO switch has been resolved, the UPS can be
restarted as follows:
1.
Reset the EPO switch.
2.
Switch off the following circuit breakers: ac input, bypass ac input, battery.
3.
Switch on these circuit breakers: ac input, bypass ac input.
Do not switch on the battery circuit breaker at this time.
4.
Switch on the UPS (“Operation > Turn on/off > System on > OK”).
5.
Wait until the green LED on the left of the front panel of each UPS module is lit green.
Then switch on the battery circuit breaker.
(Note: the battery circuit breaker is not located on the UPS. It is either on the battery box or on the
cables connecting the battery box to the UPS.
6. The UPS is now ready for use.
