User's Manual

Mains Breakdown Relay
To be able to distinguish PSU faults from power failure, a mains
breakdown relay must be used on the repeater mains supply.
The mains breakdown relay is not included in the repeater. So, it has to
be mounted outside the repeater chassis. The relay intended for this
purpose must fulfil the following specifications:
Relay specification
Closing time: max. 30 milliseconds
Insulation coil/contact: min. 4KV
Mains connected relay must be in compliance with valid local regulations.
Connection
• Connect a normally closed relay contact to pin AI1 and AIC on the P33
alarm connector (closed contact at no current). Alarm is initiated by
short circuiting the AI1 and AIC inputs as shown in Figure 3-8. The
P33 alarm connector is detailed on page 3-11.
• Connect the relay coil. It must be supplied from the same fuse as the
repeater.
• After commissioning, select the Mains breakdown option in the
Alarm Configuration dialog box described in the Alarm Configuration
section in Chapter 11.
ALLGON
Figure 3-8. Mains breakdown relay connection
ALLGON System AB AR Repeaters & OMT32 Hardware – Installation
User’s Manual VD202 90/EN Rev. 1A 1999-07 3 - 14