Loop Replacement System

LRS-FP or LRS-DB Sensor: The flat orange pack or white pvc with orange caps is the LRS sensor. This device will be placed under or next to the path to sense vehicle presence. After sensing a vehicle it sends a signal to the LRS-C1 controller indicating a vehicle is present.

LRS-C1 Controller: The box with dipswitches and sensitivity dial is the LRS-C1 controller. You need this device to translate signal from the LRS sensor to the operator when a vehicle is present. The LRS-C1 controller takes in signal through the LRS sensor communication wires and uses a relay output to communicate that detection to your gate operator.

1. LRS Sensor

When connected to the LRS-C1 controller error codes E1, E2, or E3 may show to indicate a critical problem with the sensor. The meaning of these codes can be found in their corresponding questions on this FAQ page.

2. LRS-C1 Controller

2a. While the LRS-C1 controller has power and a connection to the LRS sensor, disconnect any wires going into relay outputs (NC, COM, and NO) on your LRS-C1 controller.

2b. Set digital multimeter to check for continuity. On the LRS-C1 controller, connect one meter lead to COM and the other meter lead to NO.

2c. The meter should read open (OL, INF) and should not beep yet. Move a metal tool over the sensor. Verify the LRS-C1 controller red light turns on, and the meter reads less than 10 ohms and now beeps. If the red light turns on but the meter is still showing open and does not beep, then the relay is defective.

Minor Magnetic Interference: Installing the LRS sensor within 5 feet of iron or steel objects that are permanent and will not be moved could be problem. The ability for the LRS sensor to detect will be weaker the closer it is to metal and the larger the metal object is. You can help the LRS detect by increasing the sensitivity on the LRS-C1 controller.

Major Magnetic Interference: There comes a point where the ability to detect is too weak and increasing the sensitivity will no longer help. The following will definitely cause a major magnetic interference. Any iron or steel metal object between the LRS sensor and the vehicle to be detected, such as installing the LRS sensor beneath rebar, will be a problem. Do not install the LRS sensor beneath rebar in a concrete roadway. Any iron or steel metal objects directly touching the LRS sensor, such as an LRS-DB strapped to the side of a metal building can also be a problem.

This error means there was a communication failure between the sensor and controller.

Incorrect or Damaged Wiring: Make sure the wires from the LRS sensor are properly seated to the LRS-C1 controller and are still completely intact.

Cycle Power: Remove power from the LRS-C1 controller for at least ten seconds and then return power to it.

This error means there is insufficient supply voltage

Power Failure: Using a multimeter, check the power supplied to the LRS-C1 controller inputs VIN1 and VIN2. Voltage should read between 12-30 VDC or 12-24 VAC. If supply voltage is confirmed to be correct with multimeter, consider using an independent power supply, such as 120 VAC to 12 VDC power converter (minimum 100 mA).

Sensor Error: Disconnect the sensor and see if the E2 error changes to an E1 error. If so, then the LRS sensor is defective.

This error means there is damage to the sensor.

Cycle Power: Remove power from the LRS-C1 controller for at least 10 seconds and then return power to it. If error E3 reoccurs, the LRS sensor is defective. To determine whether the LRS-C1 controller is functioning will require a functioning LRS sensor.

Device Calibration: The LRS may be out of calibration. Press the black reset button next to the controller sensitivity display to calibrate to the local environment. Make sure area is clear of unwanted objects during calibration. Any iron or steel objects such as vehicles or hand tools within 5 feet of the sensor during calibration will be considered a permanent part of the local environment. This means the LRS will be out of calibration if those objects are moved.

High Sensitivity: Reduce sensitivity by turning the sensitivity dial counterclockwise one or two levels to see if this prevents the false triggers. Test to make sure the sensitivity is still high enough to trigger when an iron or steel object is over the sensor.

Delay Dipswitch: Add a delay before the relay output is activated by a signal. Turn on the delay setting by turning dipswitch 4 on, which causes the controller to wait 2 seconds before activation.

Overloaded Power Supply: Remove all other electronic equipment from the power supply that is powering the LRS-C1 controller, or isolate it on its own power supply to make sure its power source is not overloaded.

Noise in the System: Make sure the sensor shield wire is connected to earth ground. Make sure there are no underground or above ground power lines, or power transformers nearby the sensor since significant changes to the magnetic field around the sensor can cause it to trip.

The red detect light on and a number showing on the display when no detection should be occurring means the device is out of calibration.

Device Calibration: The LRS may be out of calibration. Press the black reset button next to the controller sensitivity display to calibrate to the local environment. Make sure area is clear of unwanted objects during calibration. Any iron or steel objects such as vehicles or hand tools within 5 feet of the sensor during calibration will be considered a permanent part of the local environment. This means the LRS will be out of calibration if those objects are moved.

Sensor Movement: If the device repeatedly goes out of calibration then the sensor installation may be at fault. The LRS-FP or LRS-DB sensor must remain in the same place at all times to maintain calibration. Any movement of the sensor will cause the LRS to be out of calibration.

Error Code: There may be an error on the display, flashing between E and either 1, 2, or 3.

Low Sensitivity: Increase the sensitivity dial by turning it clockwise one or two levels. Make sure not to increase sensitivity too high or the device may be activated by objects outside of the desired range.

Power Failure: Using a multimeter, check the power supplied to the LRS-C1 controller inputs VIN1 and VIN2. Voltage should read between 12-30 VDC or 12-24 VAC. Try disconnecting the sensor. If the green power light on the controller returns, the sensor is defective.

The number is an inverse representation of how much the magnetic field has been disrupted around the LRS sensor. In other words, how close is my car to the sensor. A 9 will show up when the LRS sensor can first see the vehicle, and it will count down as you get closer, eventually stopping as low as 1 when you are right on top of the sensor. The sensitivity dial points to which number must be reached on the display to trigger the relay and open the gate.