The multi module MEA244-1 has been designed espe-
cially for use in extinguishing systems. It has 4 indepen-
dent inputs for connection of contact detectors, and 4
independent, powerful outputs for actuation of external
control devices.
The inputs are monitored to detect wire breakages and
short circuits of the connection leads. On the outputs
the internal resistances of the control devices and the
line resistances are monitored separately. An automatic
calibration procedure, which gets started by pressing
a key during commissioning, determines the reference
values of both resistances. The patented method of
multiple monitoring makes the reliable detection of line
or load faults as well as contact corrosion possible.
The multi module is operated on the ADM loop with
System Sensor/200 protocol and has an integrated
dual-isolator. The module occupies 8 consecutive
addresses on the ADM loop. During commissioning, the
base address, which is assigned to input 1, gets ente-
red using a key, all further addresses are automatically
assigned by the module.
The MEA244-1 and the connected control devices are
supplied through an external 24V power supply. The
supply voltage gets supervised for undervoltages. If the
voltage drops below the threshold of the undervoltage
detection, then this event is automatically signalled to
the control panel, via the loop, as fault of all four out-
puts. Each input and each output has a status LED.
The multi module is available in two versions:
•
The
MEA244-1/TR
has
been
designed
for
mounting
on a DIN rail,
•
the
MEA244-1/E
can
be
mounted
in
a
control
panel
using the supplied mounting spacers
