LMRRUL - Photoelectric sensor LIFT-MASTER - Free user manual and instructions

Product type	Monitored retroreflective photoelectric sensor
Brand	LIFT-MASTER
Model	LMRRUL
Maximum range	15.2 m (50 ft)
Sensor power supply	6.8 V DC, 20 mA
Heater power supply	10 to 40 V DC or 8 to 28 V AC, 2 W max
Operating temperature	-40 °C to 65 °C (-40 °F to 149 °F)
Protection rating	NEMA 4X
Sensor dimensions with cover	5.81 cm (W) x 9.45 cm (H) x 7.01 cm (D)
Reflector dimensions with cover	6.62 cm (W) x 11.98 cm (H) x 5.08 cm (D)
Cable length	3 m (10 ft)
Main functions	Monitored entrapment protection, LED alignment (red/blue), built-in thermostat-regulated heater
Maintenance and cleaning	Clean the sensor and reflector gently with a soft damp cloth; check alignment monthly
Safety	Disconnect power before installation; mount vertically; max. height 11.4 cm (doors) or 66 cm (barriers); use only the supplied reflector
Spare parts and accessories	LMSGBP mounting plate, LMEHUL extended cover, APOW1 transformer, K41-39254 reflector kit
Warranty	2 years

Frequently Asked Questions - LMRRUL LIFT-MASTER

What is the maximum range of the LMRRUL sensor?

The maximum range is 15.2 m (50 ft) between the sensor and reflector.

How to properly align the sensor?

After powering on, point the sensor toward the reflector. The red LED indicates misalignment, the blue LED flashes slowly (weak signal) or quickly (strong signal). A steady blue LED indicates optimal alignment. Then tighten the mounting screws.

What to do if the red LED stays on continuously?

This indicates the sensor is misaligned or obstructed. Check alignment, distance (max 15.2 m), lens cleanliness, and absence of obstacles. If condensation is present, clean and ensure the heater is connected.

How to clean the sensor and reflector?

Use a soft damp cloth to gently clean the lens of the sensor and reflector. Avoid abrasive products.

What is the recommended installation height?

For door operators, the center of the sensor lens must be at 11.4 cm (4 1/2 in) from the floor. For barrier operators, between 10.2 cm (4 in) and 66 cm (26 in) from the floor.

Is the sensor heater compatible with solar installations?

No, the heater is not recommended for any solar installations. It is thermostat-regulated and can consume up to 2 W.

What accessories are available for this sensor?

Accessories include: the LMSGBP mounting plate, LMEHUL extended cover, APOW1 plug-in transformer, and K41-39254 reflector kit with bracket.

How to test the sensor after installation?

Place an obstacle in the beam at three locations: midway, near the sensor, and near the reflector. The barrier must stop and reverse its travel. Perform this test monthly.

What does a blue flashing (slow or fast) mean?

A slow flash indicates a weak signal, a fast flash a stronger signal. This means alignment is not optimal. Adjust the sensor until you get a steady blue LED.

What is the duration of the LiftMaster warranty?

The LMRRUL sensor is warranted for two years from the date of purchase against any defect in material or workmanship.

USER MANUAL LMRRUL LIFT-MASTER

MONITORED RETRO-REFLECTIVE PHOTOELECTRIC SENSOR Model LMRRUL

Introduction

The LiftMaster® Retro-Reflective Photoelectric Sensor provides non-contact monitored entrapment protection. For use with LiftMaster® UL Listed gate operators. The sensor is a UL Recognized Component and meets UL 325 requirements. Monitored external entrapment protection devices MUST be installed at each Entrapment Zone. Refer to gate operator manual for compatibility with LMRRUL sensor.

Specifications

Max Range: 50 ft. (15.2 m)

Sensor Dimensions with Hood:

2.29"W x 3.72"H x 2.76"D

Reflector Dimensions with Hood:

2.61"W x 4.72"H x 2"D

Cable Length: 10 ft. (3 m)

Operating Temperature: -40°C to 65°C

(-40°F a 149°F)

Outdoor Rating: Nema 4X

Two black industrial electronic device components, one with a 'LiftMaster' label and the other showing a mesh grille (no text or symbols on main body)

Input voltage:

Sensor: Black/red wires 6.8 VDC, 20mA

Heater: Green/white wires 10-40VDC or 8-28 VAC, 2 watts max., 170mA @ 12 VDC/VAC,

85mA @ 24 VDC/VAC

Heater: Thermostatically controlled, NOT

recommended for solar applications

WARNING

To prevent possible SERIOUS INJURY or DEATH from a closing gate or door:

• Read and follow ALL instructions.
• Be sure to DISCONNECT ALL POWER to the operator BEFORE installing the photoelectric sensor.
• The gate or door MUST be in the fully opened or closed position BEFORE installing the LiftMaster ^® Monitored Entrapment Protection device.
• Correctly connect and align the photoelectric sensor.
• Install the photoelectric sensor so that the center of the sensor window is NO HIGHER than 4-1/2" (11.4 cm) above the floor for door operators and 26" (66 cm) above grade for gate operators.
• Monitored external entrapment protection devices MUST be installed per the operator installation manual at each Entrapment Zone.
• The sensor and reflector MUST be mounted vertically.
• Use the provided refl ector ONLY.
• Test the gate operator and ALL photoelectric sensors monthly. Replace ANY damaged devices.
• SAVE THESE INSTRUCTIONS.

Carton Inventory

• Photoelectric sensor with hood and bracket
• Reflector with hood and bracket
- Wire cover
- Screws 8-32x1" (4)
- Lock nuts 8-32 (4)

• Screws 8-32x3/8" (2)
• Thread-locking screws 10-32x1" (2)
• Screws 1/4"-20x1-1/4" (6)
• Lock nuts 1/4"-20 (2)
• M3 screw (1)
• Set screw 10-32x3/8" (1)

Tools Needed

• Philips screwdriver
• 1/8" Allen wrench
- 7/16" socket
- 11/32" socket
- 5/32" Allen key
• 3/32" Allen key

Installation

IMPORTANT: The sensor and the reflector MUST be mounted vertically. Disconnect ALL power to the operator.

1. Attach the mounting bracket to the post with 1/4"-20 screws. Drill a hole in the post through the center hole in the bracket. Optional: If installing to a square post or flat surface, you may attach the sensor bracket directly to the post without using the mounting bracket. Make sure the location of the sensor follows the specified measurements. If installing multiple sensors in close proximity, mount the sensors on opposite sides to avoid crosstalk.
2. Slide the bottom sensor bracket onto the studs of the mounting bracket and secure with 1/4"-20 lock nuts. Make sure the bracket legs are facing down.
3. Loosely attach the top sensor bracket with 10-32x1" thread-locking screws. Make sure the slots are facing up.
4. Place the sensor in the bracket and tighten the screws just enough to allow the sensor to rotate inside the bracket.
5. Slide the hood over the sensor until it snaps into place. Secure hood with the M3 screw. The hood MUST be installed on the sensor.
6. Route wires through the center hole of the mounting bracket and into the post. Optional: Use conduit with NEMA 4X compatible 1/2"-14 NPT fi tting (not provided).
7. Place the refl ector in the refl ector hood.
8. Secure the refl ector and hood to the bracket with 8-32x1" screws. Secure the bottom of the refl ector to the hood with 8-32x1" screws.
9. Mount the reflector a minimum of 3 ft. (.9 m) and maximum of 50 ft. (15.2 m) away from the sensor.

≤ 5" (12.7 cm) from gate or wall Door operators: 4-1/2" (11.4 cm) Gate operators: 4" (10.2 cm)-26" (66 cm) Optional for square post ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ≤ 5" (12.7 cm) from gate or wall Door operators: 4-1/2" (11.4 cm) Gate operators: 4" (10.2 cm)-26" (66 cm) Illustrations are for reference only; your application may look different.

Illustrations are for reference only; your application may look different.

Wiring

Sensor wiring (red and black wires): Wire the photoelectric sensors (red [+] and black [-] wires) to the appropriate inputs on the operator or expansion board as shown.

Heater wiring (green and white wires):

• OPTION 1 - Connect to the ACCESSORY POWER ON terminal on the control board (NOT polarity specific).
• OPTION 2 - Connect to an external 12V to 24V DC or AC power supply (not provided) with adequate current to power all sensors.
• OPTION 3 - For use with battery backup. Connect to ACCESSORY POWER ON and AUX RELAY terminals. Set AUX RELAY switches as shown. In this configuration, the heater will switch off during a power failure to extend the battery life.

DO NOT overload the accessory power output on the control board or the external power supply.

NOTE: Heater feature is not recommended for ANY solar installations.

Sensor Wiring

Control Board SHADON CLOSE EYES/ INTERRUPT+ CLOSE EDGE + OPEN EYES/ EDGE + CLOSE EYES/INTERRUPT for close direction OR OPEN EYES/EDGE for open direction Black (-) Red (+) Green White See below OR Expansion Board OPEN CLOSE EYES ONLY 1 EYE/EDGE 2 EYE/EDGE 3 COM SBC Red (+) to EYE or EYE/EDGE Black (-) to COM Set switch for open or close direction Green White See below

Heater Wiring
OPTION 1
Control board ACCESSORY POWER ON Max. draw 500 mA

ACCESSORY ON SW. GAS 11.0MPWR 49/23 From Sensors Green White

OR
OPTION 2
External 12V to 24V DC or AC power supply (not provided) with adequate current to power all sensors

From Sensors Green White

OR
OPTION 3
For use with battery backup
Control board ACCESSORY POWER ON Max. draw 500 mA

ACCESSORY POWER ON + SW- + - Ground power gree

Black (not provided)

White

AUX RELAY 1 1 2 3 ON OFF SW4 SW5 SW6

Expansion board aux relay
AUX RELAY will switch off during power failure

Alignment

Reconnect power to the operator.

1. Align the sensor. The red LED indicates a misaligned or blocked sensor. The blue LED indicates signal strength. Slow blinking indicates weak signal. Fast blinking indicates stronger signal. Solid blue LED indicates optimal alignment.
2. When the sensor is optimally aligned, tighten the sensor bracket screws to secure the sensor in place (about 24in-lb of torque). For extra security, tighten with the set screw until it grips the sensor.
3. Place the wire cover onto the sensor bracket. Make sure the tabs on the wire cover slide into the slots on the top of the sensor bracket. Secure the wire cover with 8-32x3/8" screws. Wire cover is NOT intended for use with conduit installations.

Technical diagram showing three-step installation of a mechanical bracket assembly with labeled components

LeftMaster 2

Red LED indicates misaligned or blocked sensor

Blue LED Solid blue indicates optimal alignment

Sensor bracket screw

Set screw

Test

Test ALL installed sensors for proper operation. Place an obstruction in the sensor beam path and run the operator. The gate will stop and reverse. If the gate does not stop and reverse, refer to Troubleshooting below. Perform the test with the obstruction in three locations:

• Halfway between the reflector and sensor
- Near the sensor
- Near the reflector

Troubleshooting

Symptom Possible Cause Solution
Obstruction does not cause the gate to reverse	1. Using incorrect refl ector2. Refl ector is mounted horizontally	1. USE THE PROVIDED REFLECTOR ONLY.2. Refl ector MUST be mounted vertically
Gate does not move	1. Minimum number of entrapment devices not installed2. Sensor is obstructed	1. Review sensor connections. Slide gate operators require a minimum or two devices; one in the close and one in the open direction.2. Check for obstructions.
Solid Red LED 1. Sensor is not properly aligned2. Sensor is too far from refl ector3. Refl ector or sensor lens is dirty4. Object is obstructing beam5. Condensation on refl ector or sensor lens	1. Align the sensor until the blue light is solid2. Decrease the distance between the sensor and refl ector3. Gently clean the sensor and refl ector with a soft damp towel4. Remove any objects obstructing beam5. Gently clean the sensor and refl ector with a soft towel; make sure sensor heater is connected.
Blinking Blue LED 1.	Sensor is not optimally aligned2. Sensor is too far from refl ector3. Refl ector or sensor lens is dirty	1. Align the sensor until the blue light is solid2. Decrease the distance between the sensor and refl ector3. Gently clean the sensor and refl ector with a soft damp towel
Blinking Red LED Indirect wiring or over voltage Check for proper connection of sensor wiring.
Red/Blue LEDs blinking together	Internal memory fault Disconnect all power, wait 15 seconds, then reconnect power.If issue continues, replace sensor.
Red/Blue LEDs alternate blinking	Internal fault Disconnect all power, wait 15 seconds, then reconnect power.If issue continues, replace sensor.

Accessories

LMSGBP: Photoelectric sensor gang box plate

LMEHUL: Photoelectric sensor extended hood

APOW1: Plug in transformer

K41-39254: Reflector, bracket, and hardware

Warranty

LiftMaster® warrants to the first consumer purchaser of this product that it is free from defect in materials and/or workmanship for a period of 2 years from the date of purchase.

NOTICE: This device complies with Part 15 of the FCC rules and Industry Canada's license-exempt RSSs. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

This device has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules and Industry Canada ICES standard. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio

communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

Two black industrial electronic device components, one with a 'LiftMaster' label and the other showing a mesh grille (no text or symbols on main body)

Technical diagram showing assembly steps of a mechanical bracket with labeled components 1 and 3

LiftMaster 2

Two black industrial electronic device components, one with a circular component labeled 'LiftMaster', the other showing a mesh grille (no visible text or symbols)

Technical diagram showing mechanical assembly steps with labeled components 1 and 3

LeftMaster ②