*Refreshing this page at any point will restart the troubleshooting guide.
First, please reference the LMP Manual. The sensor has unique requirements for air-gap, gear pitch, and speed; and will be referenced throughout the troubleshooting process. This guide assumes that the device is properly configured to accept an NPN open collector (sinking) input.
Verify that the unit is being powered
Red Lion LMP sensors require +9 to +30 VDC @ 25 mA max.
Verify that the sensing gear is made of ferrous material.
As the name implies, a magnetic pickup uses a magnetic field to detect the target's movement.
Replace the gear with one made of magnetic material, or replace the sensor with one that can detect non-ferrous materials.
Verify that the sensing gear has a propper pitch for the sensor.
The larger the gear pitch value, the smaller the gear teeth will be. The minimum gear pitch is the smallest size tooth that the sensor can detect. Refer to the chart on page 1 of the LMP manual for gear pitch, speed, and air gap requirements. If not using a gear, the targets should be 1/8" wide, with at least a 1/8" gap between targets.
Replace the gear with one that has the correct pitch, or replace the sensor with one that can sense the existing gear.
Verify the air-gap between the sensor and the gear.
Refer to the chart on page 1 of the LMP manual for gear pitch, speed, and air gap requirements. Verify that the airgap meets these requirements. Also, note that the sensor should be as close to the target as possible, although larger targets allow for a larger air gap.
*note that a standard credit card is 0.03" thick
Correct the air-gap.
Verify that the gear is moving at the correct speed.
Refer to the chart on page 1 of the LMP manual for gear pitch, speed, and air gap requirements. Ensure that the output frequency is within the range of the input device.
Replace the gear, sensor, or monitoring device to achieve a working system.
Verify the output voltage and frequency.
First, remove the sensor's signal wire from the input device. Then connect a 7.8K ohm resistor between the signal line and the positive side of the power supply. Use an oscilloscope between signal and common to verify the output voltage and frequency.
It sounds like a bad sensor.
It sounds like a bad meter.
Please contact Technical Support.
Call us on the toll-free Tech Line: 877-432-9908 or the Support button on the lower right to fill out a contact form.
Congratulations, you have resolved the issue.
It is the customer's responsibility to review the advice provided herein and its applicability to the system. Red Lion makes no representation about specific knowledge of the customer's system or the specific performance of the system. Red Lion is not responsible for any damage to equipment or connected systems. The use of this document is at your own risk. Red Lion standard product warranty applies.
Red Lion Technical Support
If you have any questions or trouble contact Red Lion Technical Support by clicking here or calling 1-877-432-9908.
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