GAI-Tronics 12579-003 User Manual

Pub. 42004-716L2C

GAI-TRONICS® CORPORATION

A HUBBELL COMPANY

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).

GAI-Tronics Corporation 400 E. Wyomissing Ave. Mohnton, PA 19540 USA

610-777-1374  800-492-1212  Fax: [phone]

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ISIT WWW.GAI-TRONICS.COM FOR PRODUCT LITERATURE AND MANUALS

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Hardware Configuration

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Block Diagram

Figure 1. Monitored Relay Module

Figure 2. MRM Block Diagram

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Interfaces

The Model 12579-003 MRM interfaces to a Page/Party® Interface (PPI) card in the ADVANCE control
cabinet via the system page line (FSK link).

Installation Safety Guidelines

Please adhere to all warnings, safety, and operating instructions on the unit and in the installation manual.

WARNING

1. Disconnect power before servicing. Do not disconnect the equipment while circuit is energized.

2. Avoid servicing the unit during electrical storms.

3. Do not touch uninsulated wires.

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Installation Guidelines

1. Notify plant personnel of a system shutdown prior to servicing the unit.

2. Disconnect power before installing or removing the MRM.

Mounting

To install the module into the Snaptrack, slide either the right or left edge of the module into the top
groove on the track. On the opposite side, press firmly on the top and bottom corners of the module until
they snap into the groove. Carefully press from each corner toward the center and simultaneously snap
the edges firmly into place.

Power

After the MRM is installed onto the Snaptrack, 12 V dc power is brought in from the auxiliary power
supply and terminated on TB9 (PWR IN). The positive leg is connected to TB9-1(+) and the return leg is
landed on TB9-2(−). An earth ground is connected to TB9-3 (EGND). TB9 is paralleled with TB10.
TB10 (PWR OUT) may be used to distribute power to additional Snaptrack modules.

OTES:

N

 Although power may be daisy-chained between MRMs and other Snaptrack modules, the preferred

method of delivering power to these modules is by providing a dedicated cable run between each
module and the auxiliary power supply.

 The auxiliary power supply return leg must be connected to earth ground for proper operation. The

physical connection should be made at the auxiliary power supply terminals.

 The ground reference for this assembly must be identical to that of the enclosure.
 The MRM does not contain any current-limiting for power. It is recommended that an external fuse

be provided with the appropriate voltage and current ratings. The selected fuse should be of the
slo-blo variety.

Data Communication Line

Terminal blocks TB11 and TB12 are for the page line connection (FSK data communication) from the
PPI card to additional MIM and MRM modules.

FSK Signal Gain

The FSK Signal Gain, R8, adjusts the FSK transmit signal strength. It is set at the factory and should not
be adjusted by the installer.

Relay - Contact Outputs

The MRM contains eight individually configurable relay-contact outputs, allowing it to control field
devices such as beacons. Connections with these field devices are made at connectors TB1 through TB8
of the 69252-001 Power Relay Module.

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Each connector corresponds to a single output (TB1 is used for output #1, TB2 is used for output #2,
etc.). If fewer than eight supervised relay-contact outputs are required, the unused outputs may be used to
receive inputs (dry contact closures or non-supervised 24 V dc wet contact closures) from field devices.

In this case, connections with these field devices are made at connectors TB1 through TB8 of the 69251­201 Monitored-In-8 PCBA. Each of these outputs may be configured to operate in one of six modes.
Two of these six modes are used to control signaling devices, while the remaining four modes are used to
receive inputs (contact closures) from field devices.

Each mode requires a unique connection scheme between the external field devices and the
appropriate connector on the MRM. The connection scheme for each mode is described below.
Since the connection scheme is independent of which output is used, only Output #1 will be
discussed.

To ensure proper termination, ferrules must be crimped on the ends of all conductors that are terminated
on the terminal blocks. The size of the ferrule is dependent upon the size of the conductor used and can
be sourced from any supplier such as Phoenix, Altec or Weidmuller. The terminals accept a maximum
conductor size of No. 12 AWG and a minimum conductor size of No. 28 AWG.

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Mode 0: Deactivate Circuit

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In Mode 0, outputs may be used to control several signaling devices by connecting/disconnecting power
to these devices. In this mode, no supervision of the loop is supported. This mode supports both ac- and
dc-powered signaling devices.

Figure 3. Deactivate Circuit - AC-Powered Beacons

Figure 3 shows the recommended wiring diagram for ac-powered signaling devices, while Figure 4 shows
the recommended wiring diagram for dc-powered signaling devices (using Output #1 as an example.)

OTE: The MRM does not contain any current-limiting for the signaling device power. It is

*N

recommended that an external fuse be provided for each output circuit with the appropriate voltage and
current ratings. The selected fuse should be of the slo-blo variety.

Figure 4. Deactivate Circuit - DC-Powered Beacons

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