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1. Emergency power supply of alarm devices
Alarm devices require 2 independent energy sources, both of which must be able to power the alarm
device alone. One of the energy sources must be the general mains supply or a similar network in non-stop
operation. The other must be part of the apparatus (e.g. a battery) or an equivalent network fused
separately. If the mains power supply is interrupted, the second source of energy must guarantee constant
non-stop operation automatically and without interruption. If the energy source belonging to the alarm
device consists of a battery, the user must ensure that the batteries used are suitable for stationary and
floating operation. The power supply for alarm devices must not be used to supply other apparatus or
parts. However, electrical equipment which serves to pass on messages may also be powered by the
said source. An automatic charging device is required to charge and maintain the battery. It must be able
to charge a battery which is discharged to its discharge voltage up to 80% max. of its rated capacity within
24 hours. The battery capacity must be sufficient to guarantee the fixed alarm duration at the end of the
stored energy time. When selecting new batteries, the user should make sure that their capacity is
sufficient to compensate the capacity loss due to natural ageing of the batteries during the prescribed
service life.
2. Commissioning the battery module
2.1 Battery module DEM 316/DEM 317
The following points must be observed:
— The battery may only be connected to the charging apparatus without load (i.e. all types of
consumers must be disconnected) and when the mains is switched OFF.
— The battery must be charged directly after discharging. The battery must not be left uncharged. It
becomes impossible to maintain a charge if the battery is left uncharged for any length of time.
— Please ensure that the temperature inside the rack is always within the admissible temperature
range specified in the data sheet.
2.2 Battery module DEM 317 A and DEM 317 B
The following points must be observed:
— The insulated screw terminals on the rear side of the battery module DEM 317 are directly
connected to the battery poles and are live.
— Before removing the insulating caps, all the connections of the battery modules DEM 317A and
DEM 317B are to be disconnected.
— When connecting the cables, the insulating caps on the battery poles should never be removed at
the same time because this could cause a short. After the cables have been connected they should
be replaced immediately.
— The cables between the battery modules DEM 317A and DEM 317B connect the pole B+ with B+,
M with M and B- with B-. When connecting the cables, the lock washer is to be mounted between
the cable lug and the nut to secure the screw.