*Refreshing this page at any point will restart the troubleshooting guide.
First, please reference the product manual for the encoder in question. Each encoder has unique power requirements, output types, and the number of pulses per revolution; and will be referenced throughout the troubleshooting process.
Red Lion encoders require DC power, refer to the encoder's product manual for its power requirements.
Is the encoder powered properly? 
Did correcting the power resolve the issue?
- Red Lion encoders output a DC square wave, which is a Logic input.
Did selecting the proper input type resolve the problem?
Verify the sink/source dip switch is in the correct position for your encoder.
-Sink if the encoder is creating a path to common.
-Source if the encoder is providing voltage to the input.
-Most encoders HMS sells are NPN or sinking outputs
Did selecting the proper input type resolve the problem?
-The input common is 0V.
-The input is where the voltage will be applied (source) or removed (sink).
Did wiring the input correctly resolve the problem?
- Many units do not have isolated inputs
Did disconnecting the other wires resolve the problem?
-Sinking inputs should measure a voltage
-Sourcing inputs should measure 0VDC
Did the input voltage measure the correct value?
* this may require an oscilloscope.
-Sinking Input:
-When the input is off, you should be measuring the same voltage as the previous step.
-When the input is on, it should be reading 0VDC.
-Sourcing Input:
-When the input is off, you should measure 0VDC.
-When the input is on, you should be measuring the voltage that the sensor outputs.
Are you reading the correct voltage?
This will cause a counter to count pulses and a rate meter to display frequency in hertz.
Did resetting the unit allow the count and/or rate to display a non-zero value?
Refer to the How to Calculate a Counter Scale Factor to properly scale the counter or the unit's manual for rate scaling.
Please visit the HMS-Networks tech support portal HMS Tech Support
