GAI-Tronics 12579-003 Monitored Relay Module (MRM) - Manual

Pub. 42004-716L2C
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 12579-003
Monitored Relay Module (MRM)
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.
How to Use the Assembly/Model
Application
The Model 12579-003 Monitored Relay Module (MRM) is a Snaptrack module designed for use in the
SmartSeries systems. GAI-Tronics uses the MRM to provide a maximum of eight independently
controlled relay-contact outputs. Each of the eight relay-contact outputs has an associated LED to
indicate its current status. These relay-contact outputs are typically used to switch power to signaling
devices, such as beacons, on command from the 69254 Series or 69440 Series Master Control Unit
(MCU).
The MRM also provides the capability of supervising the cable runs to these signaling devices for such
abnormal conditions as open-circuit conditions, ground faults, and wire-to-wire short circuit conditions.
In addition, if fewer than eight relay-contact outputs are needed for a particular application, then the
MRM may also be used to receive inputs from field devices. The MRM is comprised of three main
components: the 69613-001Central Processing Unit (CPU) printed circuit board assembly (PCBA), the
69252-001 Power Relay Module, and the 69251-201 Monitored-In-8 PCBA.
The MRM is designed to be mounted in a Snaptrack that is installed in an enclosure. Snaptrack is a
grooved plastic channel designed to allow PCBAs to securely ‘snap’ into the groove. The Snaptrack
provides flexible installation because the track may be installed inside an enclosure wherever it is
convenient.
The MRM communicates with the MCU via the 69613-001 CPU PCBA over a FSK modem intended for
use in GAI-Tronics SmartSeries systems. This FSK link (page line) is periodically monitored by the
MCU for any interruptions in communication. The MCU uses this communication channel to control
activation/de-activation of the MRM’s relay-contact outputs. In turn, the MRM uses this communication
channel to report to the MCU any cable run fault conditions that are detected. The MCU identifies a
particular MRM on this FSK link by its module address. This module address is set by rotary hex switch
S1 and S2 of the MRM (located on the CPU PCBA.) The range of valid settings is from 05 to FE (hex).