EMX IRB-MON2 Universal UL325 Thru Beam Photoeye Instruction Manual
- June 16, 2024
- EMX
Table of Contents
IRB-MON2TM
Universal UL325 Thru Beam Photoeye
Instruction Manual
The IRB-MON2 thru beam infrared photoeye is an external entrapment protection device type B1, non-contact sensor for use with automatic gates and doors. The photoeye provides a signal to the gate or door operator that the beam is, or is not obstructed. It operates up to 115 feet over a wide range of input voltages (6-35 VDC and 12-24 VAC). The receiver green alignment indicator provides status information, making set-up and alignment easy. The IRB-MON2 provides compatibility with most operators that accommodate monitored external entrapment devices per UL325.
Cautions and Warnings
This product is an accessory or part of a system. Install the IRB-MON2 according to instructions from the gate or door operator manufacturer. Comply with all applicable codes and safety regulations.
Specifications
| Operating Range | 5 to 115 ft (35 m) |
|---|---|
| Power | 6-35 VDC, 12-24 VAC |
| Current (NC and 10K Monitoring Methods) | 35 mA DC (when aligned and relay |
activated)
Current (Pulse Monitoring Methods)| 15 mA
Connections| “Removable” screw terminal for easy wiring
Supported Monitoring Methods| 10K, 2-wire pulse, Normally Closed (power cycle)
Relay Output Configuration| Form C contacts (NO, COM, NC)
Response Time| <300 mS (for use in NC or 10K monitoring)
Operating Temperature| -40° to 170°F (-40° to 77°C)
Dimensions (L x W x H)| 3.6” (91 mm) x 2.9” (74 mm) x 2.9” (74 mm)
Conduit Hole Size (bottom of the housing)| ½ Inch NPT
Ordering Information
- IRB-MON2-HD – Gray powder-coated metal protective hoods
Monitoring Methods
UL325 requires continuous monitoring of all safety devices connected to gate and door operators. Consult the gate or door operator manufacturer’s instruction manual for necessary monitoring method.
- Normally Closed (Wiring Diagram A): The operator cycles power to the transmitter while monitoring the receiver N.C. (Normally closed) contacts for proper operation
- 10K Resistive Termination (Wiring Diagram B): Provides a measurable 10K ohm resistance across the N.O. (normally open) relay when unobstructed and in Fail Safe mode
- Two-Wire Pulse, 2 Frequency (Wiring Diagram C): Provides 300Hz “heartbeat” unobstructed, 0Hz obstructed over the receiver input power supply lines
- Two-Wire Pulse, 3 Frequency (Wiring Diagram D): Provides 300Hz “heartbeat” unobstructed, 2Hz obstructed, and 0Hz when failure is detected, over the receiver input power supply lines
Board Diagram
Sensitivity Potentiometer
Clockwise is maximum sensitivity
Counter-clockwise is minimum sensitivity
Installation
- Determine the IRB-MON2 mounting location (4-25 inches above the ground).
- Deactivate the gate or door during photoeye installation.
- The IRB-MON2 cannot be used for a detection range of less than 5 feet.
1. SET DIPSWITCH FOR MONITORING METHOD: Check the GATE or DOOR OPERATOR manual (or call the operator company) to determine which monitoring method is necessary for your operator. Remove the front
covers (remove 4 plastic screws in each unit), and then set IRB-MON2 dipswitches per pages 4 & 5 for the needed operator monitoring method.|
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2. MOUNTING: Determine your mounting height from 4 to 25 inches above
the ground, and mount the housings using 4 screws (not supplied) that go
through the inside of the housing, inside of the 4 holes in the corners (same
holes where the plastic screws came out of).
3. WIRING: Connect 6-35 VDC or 12-24 VAC to the “Power Input” terminals
on the transmitter (marked “+ -”) and receiver (marked “PWR”). Remove (pull
up on) the green screw terminals for ease of wiring. Wire according
to the page 5 diagram that corresponds to your operator monitoring method.
Wiring must enter via UL listed watertight conduit fitting such as a ½”
watertight conduit connector, through the bottom of the housing.
NOTE: MUST USE 6-35 VDC FOR PULSE MONITORING.
4. OPTIONAL: Install optional sunshield over the receiver reflector to
reduce the effects of sun interference or cross talk.
5. POWER: Apply power to the IRB-MON2 transmitter and receiver.
6. ALIGNED CORRECTLY: The receiver and transmitter are aligned when the
RECEIVER green LED is on “solid”. Once on solid, then slowly decrease the
sensitivity setting on the receiver (turn potentiometer counter clockwise)
until the receiver green LED just starts to flash. Now, increase sensitivity
setting “one quarter” turn clockwise. Confirm receiver LED is still on solid.
| LED Indicators
Transmitter – Green LED on| Power
Receiver – Green LED on solid| Aligned
Receiver – Green LED flashing| Beam blocked or not aligned
8. TEST OBSTRUCTION: Place an obstruction (ex. hand) between the
transmitter and receiver — The receiver green LED should start flashing. Check
the operator control board and verify the safety input is recognized by the
operator. Test the beam with an obstruction between transmitter and receiver
at multiple distances to confirm proper operation.
9. REMOVE OBSTRUCTION: Remove the obstruction and the receiver green LED
will turn on solid.
TIP: If the IRB-MON2 is aligned but not detecting an obstruction,
slowly reduce the receiver sensitivity (counter-clockwise) until the
obstruction is detected. This may be applicable for installations with a
detection zone of less than 20 ft.
10. SECURE THE COVERS: Secure the covers using all four plastic screws
provided (do not over tighten the screws but make them snug). Done!
Configuration Settings
Monitoring
Method| Wiring
Diagram| DIP Switch Settings| Output
Connections| 10K
State
---|---|---|---|---
SW1| SW2| SW3| SW4
Normally Closed| A| OFF| OFF| ON| OFF| NC, COM| 10K
DISABLED
10K Resistive Termination| B| OFF| OFF| ON| ON| NO, COM| 10K
ENABLED
Two-Wire Pulse
(2 Frequency: 300Hz, 0Hz)| C| ON| OFF| OFF| OFF| DC POWER| N/A
Two-Wire Pulse (3 Frequency: 300Hz, 2Hz, 0Hz)| D| OFF| ON| OFF| OFF| DC
POWER| N/A
-
FAIL SAFE (Wiring Diagram A or B) – Most common monitoring method – Gate opens with loss of power – DIP switches shown as in the table above for monitored “Normally Closed” or “10K Resistive Termination”. The relay will change state during a loss of power (N.C. will open, and N.O. will close).
NOTE: Use this mode in all normal operations and UL325 monitoring scenarios. -
FAIL SECURE (Wiring Diagram A or B) – Less common monitoring method, Gate closes/secures with loss of power – To achieve Fail Secure for either “Normally Closed” or “10K resistive termination”, configure dipswitches the same as shown in the above table “EXCEPT” SW1 needs to be ON. The relay will function opposite what is written on the PCB. When powered on and aligned the
N.O. relay will be closed, and the N.C. contact will be open. The relay WILL NOT change states during loss of power so the gate stays closed during power loss (N.O. will close, and N.C. will open). -
Two-Wire Pulse Monitoring (Wiring Diagram C or D) – Must use 6-35 VDC (can’t use AC power in two-wire pulse mode) and requires a compatible operator board with the current limiting circuitry.
Note: If using the IRB-MON in an application that requires Normally Open, but does not require a 10K resistor across the normally open contact then wire according to diagram B with dispswitch SW4 set to OFF.
Wiring Diagrams
Wire Diagram A: Normally Closed
| Wiring Diagram B: 10K Resistive Termination
*If you need a normally open relay, but without a 10K resistor then set Dipswitch
4 to OFF. This is a non-monitored method.
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Wiring Diagram C: Two-Wire Pulse (2 Frequency)
| Wiring Diagram D: Two-Wire Pulse (3 Frequency)
Troubleshooting
| Symptom | Possible Cause | Solution |
|---|---|---|
| Does not detect obstruction | Sensitivity is too high | |
| Signal is reflecting off another surface | Decrease sensitivity potentiometer |
counterclockwise
Check area for highly reflective surfaces
Receiver green LED flashes continuously, indicating an obstruction when one is
not present| Sensitivity is too low
Transmitter does not have power
Receiver does not “see” transmitter| Increase sensitivity potentiometer
clockwise
Check power source of transmitter
Make sure transmitter and receiver are aligned
Receiver activates but does not transmit signal to operator| Faulty connection
between receiver and operator control input| Verify all wires and terminal
connections
Receiver green LED off| Transmitter too close to receiver| Decrease
sensitivity (potentiometer counterclockwise)
Increase distance between transmitter and receiver
Output relay chatters constantly between open and close| All 4 DIP switches
are in the OFF position| Operator expects Diagram C or D but dipswitches are
configured according to Diagram A or B on page 4
Warranty
EMX Industries, Inc. products have a warranty against defects in materials and workmanship for a period of two years from the date of sale to our customer.
EMX Industries, Inc.
Document No. 10280104 REV 1.5
Tech support: 216-518-9889
technical@emxinc.com
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