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I have a Perkins 838 / 14 over speed sensor to test. there is no test function available on the machine. How would we go about testing this??
geeH,
There are two basic types of speed sensors: passive (inductive) and active. Passive speed pick-ups "generate" their own power and do not require a power source to produce a signal.
Active speed pick-ups require a power source to produce a signal.
Most passive speed pick-ups have two wires (some have a third ground or earth wire). Most active speed pick-ups have three wires (and some also have a fourth ground/earth wire).
Some manufacturers produce speed pick-ups with two sensors in a single body (most are single sensors in a single body).
Most speed pick-ups can be checked using an ohmmeter (when removed from the mounting location). If you have multiple sensors you can compare readings from a known, good sensor to the questionable sensor's readings.
You need to know what kind of sensor the 838/14 is: passive (sometimes called inductive), or active. You can use your preferred Internet search engine to learn about the characteristics of both types of sensors.
When the sensor is installed in the machine you should also be able to use a multimeter which can read frequency to measure the output frequency on the sensor's output terminals.
There are other types of sensors, but with no other information we can't provide any other assistance. You should be able to look at the manual for the control or protection system the sensor is connected to to determine what type of sensor the 838/14 is, and proceed to troubleshoot using that information.
I have connected a frequency meter (multimeter) to the output terminals of passive sensors and waved the shaft of a metal screwdriver back and forth very quickly across the face of the sensor (very close to the face of the sensor) and been able to see a low frequency signal. I have also used the chuck of a drill motor (the type of chuck that uses a key to close and open it) and held a passive sensor very close to the "teeth" on the chuck and been able to read a frequency.
Lastly, if can tell us why you suspect the sensor is bad and something about the control or protection system the sensor is connected to (manufacturer's name), perhaps someone could provide more information. But we need more information to be if any further help.
Hope this helps! Please write back to let us know how you fare.
There are two basic types of speed sensors: passive (inductive) and active. Passive speed pick-ups "generate" their own power and do not require a power source to produce a signal.
Active speed pick-ups require a power source to produce a signal.
Most passive speed pick-ups have two wires (some have a third ground or earth wire). Most active speed pick-ups have three wires (and some also have a fourth ground/earth wire).
Some manufacturers produce speed pick-ups with two sensors in a single body (most are single sensors in a single body).
Most speed pick-ups can be checked using an ohmmeter (when removed from the mounting location). If you have multiple sensors you can compare readings from a known, good sensor to the questionable sensor's readings.
You need to know what kind of sensor the 838/14 is: passive (sometimes called inductive), or active. You can use your preferred Internet search engine to learn about the characteristics of both types of sensors.
When the sensor is installed in the machine you should also be able to use a multimeter which can read frequency to measure the output frequency on the sensor's output terminals.
There are other types of sensors, but with no other information we can't provide any other assistance. You should be able to look at the manual for the control or protection system the sensor is connected to to determine what type of sensor the 838/14 is, and proceed to troubleshoot using that information.
I have connected a frequency meter (multimeter) to the output terminals of passive sensors and waved the shaft of a metal screwdriver back and forth very quickly across the face of the sensor (very close to the face of the sensor) and been able to see a low frequency signal. I have also used the chuck of a drill motor (the type of chuck that uses a key to close and open it) and held a passive sensor very close to the "teeth" on the chuck and been able to read a frequency.
Lastly, if can tell us why you suspect the sensor is bad and something about the control or protection system the sensor is connected to (manufacturer's name), perhaps someone could provide more information. But we need more information to be if any further help.
Hope this helps! Please write back to let us know how you fare.
