GAI-Tronics 379-002 User Manual
Pub. 42004-491A
GAI-TRONICS® CORPORATION
A HUBBELL COMPANY
Model 379-002
Monitored Relay Module (MRM) Station
Confidential ity 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
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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The Model 379-002 Monitored Relay Module (MRM) Station components are housed in a NEMA 4X
stainless steel enclosure measuring 13.00 W 14.30 H 6.23 D inches. Components include a 12 V dc
power supply and a 12579-002 Monitored Relay Module.
The 12579-002 Monitored Relay Module is comprised of three components: the 69248-102TR CPU and
the 69251-201TR Monitored-Input PCBA, and the 69252-001TR Relay PCBA. Refer to Figure 1 for
component locations.
The scope of this manual is limited to the mounting and wiring connections for the Model 379-002
Station. Refer to Pub. 42004-712L2 for additional information on the 12579-002 Monitored Relay
Module.
Figure 1. Model 379-002 MRM Station (Interior View)
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Installation
CAUTION
Do not install this equipment in hazardous areas. Disconnect power before installing or removing
the MRM.
Mounting
The Model 379-002 MRM Station enclosure is not supplied with conduit or cable gland holes since cable
quantity, size, and entry location vary with each installation.
Drill or punch openings at the required locations before mounting the enclosure. Typically multiple
cables entries are required for power, serial data line, and input wiring. Refer to the Wiring section
below. Use caution when drilling or punching the enclosure to avoid damaging the internal components.
Bottom cable entry is recommended to prevent moisture from entering the enclosure and dripping onto
the terminals or circuit boards.
Mount the enclosure to a suitable surface using appropriate customer-supplied hardware. Refer to Figure
1 for mounting hole dimensions.
Remove the shipping tie-wrap that is securing the PCBA to its mounting Snaptrack.
Wir in g
The MRM Station requires 120 V ac power and a serial data line connection (RS-485) to the ADVANCE
System Control Cabinet. Up to eight input and relay output circuits are connected as needed. Each
connection is explained below.
Power
120 V ac power is connected to terminal block TB13 at the top of the panel. Refer to Figure 1.
WARNING
Earth grounding provisions are provided.
Function Terminal Block Wire Color
AC Line (hot) TB13-1 Black
Neutral TB13-2 White
Ground TB13-3 Green/yellow
Insure proper grounding to protective earthing.
Table 1.
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Data Communications
Terminal blocks TB11 and TB12 are for “feed-thru” connection of the RS-485 data cable. The data cable
should consist of a twisted pair with shield. One end of the data cable must be terminated to the
ADVANCE System Control Cabinet. A total of ten MR M and MIM modules can be parallel wired to
the data cable. The most distant MRM or MIM should have a termination resistor installed to the data
line by installing jumper P2 on the 69248-xxx CPU PCBA.
CAUTION
The RS-485 line is polarity-sensitive. Be sure to maintain circuit polarity throughout installation.
OTES:
N
Only one termination resistor should be installed across the RS-485 data line. Be sure jumper P2 is
installed on only the most distant MRM or MIM.
Address Setting
Each MRM and MIM on the RS-485 data line must be set with a unique hardware address. Consult the
System Administrator for the proper address prior to setting the address switch on the MRM or MIM.
Addresses for each module are determined by the System Administrator’s software configuration of the
ADVANCE system. The address is set using the hexadecimal switch on the 69248-xxx CPU PCBA.
Valid addresses are 5–F.
Relay - Co ntact Outpu ts
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-xxx Power Relay Module.
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 69251xxx 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
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 2. Deactivate Circuit - AC-Powered Beacons
Figure 2 shows the recommended wiring diagram for ac-powered signaling devices, while Figure 3 shows
the recommended wiring diagram for dc-powered signaling devices (using Output #1 as an example.)
*NOTE: The MRM does not contain any current-limiting for the signaling device power. It is
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 slow-blow variety.
Figure 3. Deactivate Circuit - DC-Powered Beacons
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