M502M Interface Module
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: 630-377-6495
www.systemsensor.com
BEFORE INSTALLING
This information is included as a quick reference installation guide. Refer to
the control panel installation manual for detailed system information. If the
modules will be installed in an existing operational system, inform the opera-
tor and local authority that the system will be temporarily out of service. Dis-
connect power to the control panel before installing the modules.
NOTICE: This manual should be left with the owner/user of this equipment.
GENERAL DESCRIPTION
The M502M Interface Module is intended for use in intelligent, two-wire sys-
tems, where the individual address of each module is selected using the built-
in rotary decade switches. This module allows intelligent panels to interface
and monitor two-wire conventional smoke detectors. It transmits the status
(normal, open, or alarm) of one full zone of conventional detectors back to
the control panel. All two-wire detectors being monitored must be UL compat-
ible with this module. The M502M has a panel controlled LED indicator.
COMPATIBILITY REQUIREMENTS
To ensure proper operation, these modules shall be connected to listed com-
patible system control panels only.
MOUNTING
The M502M mounts directly to 4˝ square electrical boxes. (See Figure 2A.).
The box must have a minimum depth of 2.125˝. Surface mounted electrical
boxes (SMB500) are available from System Sensor.
WIRING
NOTE: All wiring must conform to applicable local
codes, ordinances, and regulations. This module is
intended for power-limited wiring only.
1. Install module wiring in accordance with the job
drawings and appropriate wiring diagrams.
2. Set the address on the module per job drawings.
3.
Secure module to electrical box (supplied by
installer), as shown in Figure 2A.
FIGURE 1. CONTROLS AND INDICATORS
C0218-03
Specifications
Normal Operating Voltage:
15 to 32 VDC
Maximum Current Draw:
5.1 mA (LED on)
Average Operating Current:
300 µA, 1 communication and 1 LED flash every 5 seconds, 3.9k eol
EOL Resistance:
3.9K Ohms
Maximum IDC wiring resistance:
25 Ohms
IDC Supply Voltage (between Terminals T10 and T11)
Regulated DC Voltage:
24 VDC power limited
Ripple Voltage:
0.1 Volts RMS maximum
Alarm Current:
90 mA per module
Standby Current:
13 mA Maximum @24 VDC
Temperature Range:
32˚F to 120˚F (0˚C to 49˚C)
Humidity:
10% to 93% Non-condensing
Dimensions:
4.5˝ H x 4˝ W x 1.25˝ D (Mounts to a 4˝ square by 2.125˝ deep box.)
Accessories:
SMB500 Electrical Box
FIGURE 2A. MODULE MOUNTING WITH BARRIER
FIGURE 2B.
C0450-03
I56-3854-00
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FIGURE 3. INTERFACE TWO-WIRE CONVENTIONAL DETECTORS, NFPA CLASS B
(+)
(–)
(+)
(–)
(+)
(–)
+
–
+
–
LISTED BATTERY-BACKUP SWITCHED
REGUALTED DC POWER SUPPLY
POWER TO THE INTERFACE MODULE
MUST BE EXTERNALLY SWITCED TO
RESET THE DETECTORS. AN M500R RELAY
CONTROL MODULE CAN BE USED TO
SWITCH POWER FROM A STANDARD
POWER SUPPLY - SEE FIGURE 5.
OPTIONAL BRANCH CIRCUIT
TO NEXT INTERFACE MODULE.
MODULE SUPERVISES SUPPLY
VOLTAGE AND DETECTOR LOOP.
(+)
(–)
TERMINAL WIRING MUST BE POWER LIMITED.
DO NOT MIX FIRE ALARM INITIATING, SUPERVISORY,
OR SECURITY DEVICES ON THE SAME MODULE.
TO NEXT
DEVICE
INTERFACE
MODULE
SIGNAL LINE CIRCUIT (SLC)
32 VDC MAX.
TWISTED PAIR
IS RECOMMENDED
CONNECT MODULES TO LISTED
COMPATIBLE CONTROL PANELS ONLY.
FROM PANEL OR
PREVIOUS DEVICE
3.9K EOL
RESISTOR
(INCLUDED)
A2143-10
DO NOT LOOP WIRE UNDER TERMINALS. BREAK ALL WIRE
RUN TO PROVIDE SUPERVISION OF CONNECTIONS.
DETECTORS MUST BE UL LISTED COMPATIBLE WITH
MODULE. INSTALL DETECTORS PER MANUFACTURER’S
INSTALLATION INSTRUCTIONS
*NOTE: ANY FAULT IN THE POWER SUPPLY IS LIMITED TO THAT ZONE AND DOES NOT RESULT IN A FAULT IN A SEPARATE ZONE.
C0921-06
C0449-03
1
I56-3854-003
7/1/2022