EMX IRB-RET2 UL325 User manual

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Document No. 10400104 Rev 1.1[email protected]
IRB-RET2™
Universal UL325 Retroreflective Photoeye
Instruction Manual
The IRB-RET2 retroreflective, infrared photoeye is an external entrapment protection device type B1, non-
contact sensor for use with automatic gates and doors. The reflector directs the beam back to the
photoeye, therefore wiring to the other side of the roadway is not needed. The IRB-RET2 is compatible
with most operators that accommodate monitored external entrapment devices per UL325. (six
monitoring methods are available) The IRB-RET2 operates up to 60 feet over a wide range of voltages (6-
40 VDC and 12-24 VAC). A red alignment indicator on the receiver provides easy set-up and alignment.
Cautions and Warnings
This product is an accessory or part of a system. Install the IRB-RET2 according to
instructions from the gate or door operator manufacturer. Comply with all applicable codes
and safety regulations.
Specifications
Ordering Information
• IRB-RET2 KIT Retroreflective photoeye kit, includes photoeye, reflector with hood and
mounting bracket.
Operating Range
5 ft (1.5 m) to 60 ft (18.3 m)
Power
6-40 VDC, 12-24 VAC
ononly)
Current (NC and 10K Monitoring Methods)
50 mA DC (relay activated)
Current (Pulse Monitoring Methods)
15 mA DC
Resistive Termination
10K ohm across NO contact (switch selectable)
Surge Protection
Thermal fuse, MOV
Relay Output Operation
Light ON/Dark ON
Response Time
250ms
Operating Temperature
-30° to 140°F (-34° to 60°C)
Dimensions (L x W x H)
5.1” (130 mm) x 3.15” (80 mm) x 5.5” (140 mm)
Ball Joint Mount Conduit Thread
½Inch NPT

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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 the necessary monitoring
method.
•
Normally Closed: Cycles power to the transmitter while monitoring the receiver contacts for proper
operation
•
10K Resistive Termination: Provides a measurable 10K ohm resistance across the normally open
(NO) contact when unobstructed
•
Two-wire Pulse (2 Frequency): Provides 300Hz “heartbeat” unobstructed, 0Hz obstructed over
power supply lines
•
Two-wire Pulse (3 Frequency): Provides 300Hz “heartbeat” unobstructed, 2Hz obstructed, and
0Hz failure over power supply lines
•
Four-wire Pulse (2 Frequency): Provides 300Hz “heartbeat” unobstructed, 0Hz obstructed over
separate connection
•
Four-wire Pulse (3 Frequency): Provides 300Hz “heartbeat” unobstructed, 2Hz obstructed, and
0Hz failure over separate connection

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Installation
•
Determine the mounting location of the IRB-RET2 photoeye according to UL325 guidelines.
•
Deactivate the gate or door prior to and during photoeye installation.
•
The IRB-RET2 cannot be used for a detection range of less than 5 feet.
1. Check the instruction manual of the gate
or door operator to determine which
monitoring method is required for that
specific operator.
2. Unscrew the four back cover screws,
then remove back cover. Feed wiring
through ball joint opening.
The wiring to the enclosure must enter
via a UL listed watertight fitting such as a
strain relief or ½inch NPT thread
watertight conduit connector.
3. Review the configuration table and
wiring diagram on PAGE 10 that
corresponds with the monitoring
method required for the gate or door
operator. Wire the IRB-RET2 accordingly.
MUST USE 6-40 VDC FOR PULSE
MONITORING.

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The IRB-RET2 has detachable screw terminals for
easier wiring. Remove them while connecting
wires, then plug them back in properly and secure
them.
The 4-terminal connector on the right is for power,
while the 5-terminal connector on the left is for
control signals.
Be careful not to install the connectors upside
down.
4. To mount the photoeye, first secure the bracket clamp base (ITEM C) to the mounting surface.
The mounting for a flat surface, such as a square tube or wall is shown below.

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The mounting for a curved surface, such as a pole, is shown below:
Note the different screw locations for a flat vs. curved surface. The mounting patterns for flat and
curved surface are shown below.
Mounting Position for Gates
Mounting Position for Overhead Doors

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5. After mounting the bracket base, attach the photoeye and bracket clamp. Tighten the two bracket
clamp screws (ITEM B) to secure the photoeye, but leave them loose enough for the photoeye to
swivel using the ball joint during the alignment process.
LED Indicators
Indication
State
Safety State
Green LED & Red LED On
Aligned with reflector, no
obstruction
Safe
Green LED On & Red LED
Flashing
Partial Alignment
Safe
Green LED On & Red LED Off
Beam obstructed or not aligned
Not Safe
Green LED Off
No power
Not Safe
6. Sensitivity Adjustment - Adjust sensitivity using potentiometer R1
(shown to the right) at the top left of the circuit board. Use the
markings as a guide based on the distance between the sensor and
reflector:
• 5-20 ft: Point the dial at the 5-20 ft marking
• 20-30 ft: Point the dial at the 20-30 ft marking
• 30-60 ft: Point the dial at the 30-60 ft marking
If you have trouble aligning the sensor or if you are concerned
about rain, snow, or fog obstructing the IR beam, you can increase the sensitivity by adjusting the
potentiometer clockwise.
Configuration - After setting sensitivity, check DIP switches SW1 and SW2, and jumper JP1 to ensure
proper setup (refer to Configuration Table on PAGE 9 and Wiring Diagrams on PAGES 10-12).
Adjusting sensitivity and configurations might be harder once the photoeye is aligned, as the back
cover may not be easily accessible.
Stealth Mode – Enable Stealth Mode by turning ON Position 2 on DIP switch SW2. In Stealth Mode,
LEDs turn off after 30 seconds if the sensor is aligned and unblocked, but turn on when obstructed,
turning off again after 30 seconds. This mode is helpful for hiding the sensor from passers-by and
vandals, especially at night. It can be used in any setup and doesn't affect other functions.
After final adjustments are made, replace the back cover ensuring the gasket is present, and tighten
the screws.

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7. Alignment: Apply Power to the photoeye and aim it at the reflector's planned location. Go to the
reflector's mounting spot. Move the reflector left, right, up, and down to find the center of the
detection pattern (a typical installation will have a 2-foot diameter). The reflector should be placed
in the center of the detection pattern for best performance.
During this, watch the Red LED on the photoeye during alignment. A solid RED LED means the best
alignment. If the alignment isn't optimal, the Red LED will flash. Slow flashing means poor alignment,
while fast flashing indicates better alignment.
If you cannot get the photo eye to align near your intended mounting
location, adjust the aim of the photoeye and repeat this Alignment process.
Note: If Stealth Mode is on (STEP 6), LEDs turn off after 30 seconds when the
photoeye is powered and aligned. To turn LEDs back on, briefly block the light
beam with an object in front of the reflector. LEDs will turn on for 30 seconds
before turning off again.
8. To ensure the integrity of the enclosure, make sure the gasket is present, the cover is properly
seated, and the cover screws are tight. The wiring to the enclosure must enter via a UL listed
watertight fitting such as a strain relief or ½inch NPT thread watertight conduit connector.
RED LED is
located on the
RIGHT

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9. Tighten the two bracket clamp screws (ITEM B) and the set screw (ITEM A). (3/32" allen wrench is
required)
10. Verify that the photoeye and reflector are aligned.
11. Place an obstruction (ex. hand) between the photoeye and reflector. The red LED will turn off.
Remove the obstruction and the red LED will turn on.
12. Check the operator control board and verify that the safety input is recognized by the operator.
Test the beam with an obstruction between transmitter and reflector at multiple distances to
confirm proper operation.
13. Follow the gate or door operator manufacturer’s installation instructions and safety checks to
verify that the photoeye is operating properly.
Configuration Settings and Wiring Diagrams
Terminals
Description
VTX
Transmitter power input
VRX
Receiver power input
Pulse C
Isolated pulse output collector
Pulse E
Isolated pulse output emitter
Energized NO
Normally open contact, relay output shown in energized state (power on, and no
obstruction) when properly aligned to the reflector
Energized COM
Relay common
Energized NC
Normally closed contact, relay output shown in energized state (power on, and no
obstruction) when properly aligned to the reflector.

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Configuration Table
Monitoring
Method
Diagram
DIP Switch 1 Settings
DIP Switch 2 Settings
Output
Connections
Power
Connection
JP1
1
2
3
4
1
2
3
4
Normally
Closed
A
OFF
OFF
OFF
ON
OFF
OFF
ON
ON
NC, COM
VRX
4W
10K
Resistive
Termination
B
OFF
OFF
OFF
ON
ON
OFF
ON
ON
NO, COM
VRX
4W
Normally
Closed:
Power Cycle
Transmitter
Only
C
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
NC, COM
VRX, VTX
4W
Two-Wire
Pulse (2
Frequency:
300Hz, 0Hz)
D
ON
OFF
OFF
ON
OFF
OFF
ON
ON
VRX
VRX (DC
Only)
2W
Two-Wire
Pulse (3
Frequency;
300Hz, 2Hz,
0Hz)
E
OFF
ON
OFF
ON
OFF
OFF
ON
ON
VRX
VRX (DC
Only)
2W
Four-Wire
Pulse (2
Frequency:
300Hz, 0Hz)
F
ON
OFF
OFF
ON
OFF
OFF
ON
ON
E,C
VRX
4W
Four-Wire
Pulse (3
Frequency:
300Hz, 2Hz,
0Hz)
G
OFF
ON
OFF
ON
OFF
OFF
ON
ON
E,C
VRX
4W
Table 1: PCB Configurations
• For two-wire pulse monitoring, use 6-40VDC. 2-wire pulse will not work with any AC input
voltage.
• The relay contacts labeled on the terminals and the references to them in these instructions are
shown in the energized state, and no obstruction. (Dark ON setting –normally open (NO) contact
closes when the beam is unobstructed.)
• 2-Wire Pulse configurations require current limiting in the operator.
• 4-Wire Pulse output provides an emitter (Terminal “E”) and collector (Terminal “C”) connection to the
operator. The emitter is generally connected to the circuit common (ground) and the collector is
typically an open-collector output using a pull-up resistor to low-voltage DC power.

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Symptom
Possible Cause
Solution
Does not detect obstruction
Signal is reflecting off another
surface
Check area for highly reflective
surfaces such as a shiny vehicle.
Possible solutions are to move
the photoeye farther away from
the roadway or adjust the
sensitivity counter-clockwise.
Red LED flashes continuously.
Sensitivity is too low
Photoeye is not aligned with
reflector
Adjust the sensitivity clockwise
according to STEP 6.
Realign the reflector according
to STEP 7 under installation.
Photoeye activates but does not
transmit signal to operator
Faulty connection between
photoeye and operator control
input
Verify all wires and terminal
connections to operator.
Green LED not on when
powered
DIP switch SW2 positions 3 and 4,
not in the correct position
Switch DIP switch SW2 positions
3 and 4 to “ON”.
Verify input power is between
6-40 VDC / 12-24 VAC and
wire per the wiring diagram.
Device will not align,
No Red LED
No transmitter power
Turn DIP switch SW2 position 3
and 4 to ON
OR
Wire power to VTX
Warranty
EMX Industries, Inc. products have a warranty against defects in materials and workmanship for a period
of two years from date of sale to our customer.
Troubleshooting