Rev. 1.2 of 12.2020
24
3.8.3
MKL N-782/A
The N-782/A Line Control Module makes it possible to detect open and short circuits in
the fire safety system actuators power circuits for supplying and controlling 24 V DC
voltage, such as:
•
fire ventilation dampers
•
smoke dampers
•
smoke exhaust windows
•
doors
The MKL N-782/A module makes it possible to monitor the transmission circuit for
a group of devices, provided that maximum power consumption of these devices does not
exceed the maximum load current of the contact.
The MKL N-782/A makes it possible to monitor a line for devices with the three-phase
control (-,+,+; power supply and control by means of changing the voltage applied to the
first or second “positive” contact of the actuator), and two
-phase control (+,-; -,+; power
supply and control by means of changing the polarisation of the supply voltage).
In case of the line monitoring for devices supplied and controlled by means of three
wires, it is necessary to use the MKL N782/B module installed at the end of the supply and
control line, directly before the supplied device.
Connecting the Module:
Supply voltage for the actuator is applied to th
e “input”.
The actuator is connected to the “output”.
The module can cooperate with two-wire or three-wire actuators.
The S2/S3 switches are for selecting the operating mode of the device (two-wire/three-
wire actuator).
Setting S2 and S3 switches in the right position (when viewed from the front of the
device) means the three-wire mode is selected.
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