GAI-Tronics 379-002 Monitored RElay Module (MRM) Stations - Manual

Pub. 42004-491A
GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA
610-777-1374  800-492-1212  Fax: 610-796-5954
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G A I - T R O N I C S ® C O R P O R A T I O N
A H U B B E L L C O M P A N Y
Model 379-002
Monitored Relay Module (MRM) Station
Confidentiality Notice
This manual is provided solely as an operational, installation, and maintenance guide and contains
sensitive business and technical information that is confidential and proprietary to GAI-Tronics.
GAI-Tronics retains all intellectual property and other rights in or to the information contained herein,
and such information may only be used in connection with the operation of your GAI-Tronics product or
system. This manual may not be disclosed in any form, in whole or in part, directly or indirectly, to any
third party.
General Information
The Model 379-002 Monitored Relay Module (MRM) Station is used in SmartSeries ADVANCE
Systems. Operation is controlled by the system’s Master Control Unit (MCU) programming.
The MRM provides eight relay output circuits. Each relay contains two type “C” contacts rated for 5A.
Relay outputs are typically used for switching power to signaling devices such as beacons or strobes but
can be used for any switching application that does not exceed the relay’s current rating. Relay circuits
can be programmed to activate during system alarms, pages, or trouble condition.
The MRM also contains eight input circuits. Input circuits can be used supervise the cable integrity
connecting the relay output to the signaling device (as described above). During an inactive state, the
cable is monitored for open circuit, short circuit and ground fault conditions. If a cable fault is detected,
the relay circuit will not activate, preventing a possible dangerous condition. The fault condition is
automatically reported to the MCU.
For each relay circuit not requiring supervision, one input circuit is available for other functions. Inputs
are activated by a voltage-free contact (either opening or closing) or the presence/absence of a 24 V dc
input voltage. When using inputs from voltage-free contacts, the MRM can supervise the cabling
between the input terminal and the remote contact closure device. The cable is monitored for open
circuit, short circuit and ground fault conditions. The fault condition is automatically reported to the
MCU.
Each input circuit can be programmed to initiate one of the following functions in the ADVANCE
system.
 Activate an alarm
 Reset all alarms
 Cancel the current alarm
 Report a fault condition
 Reset the system MCU