Rotary Encoders
Rotary Encoders
(OP)
Is there any way to bench test a (0-499 pulse) enconder by
bench testing. I`m trying to trouble shoot just this area of the machine that giving me problems. Thanks!
bench testing. I`m trying to trouble shoot just this area of the machine that giving me problems. Thanks!





RE: Rotary Encoders
RE: Rotary Encoders
Just kidding. djs has a good idea there. Run it as slow as you can while looking at the scope. Get a good see-able scope picture with about 30-40 pulses on the display and you should be able to see any dropped pulses pretty easily.
Often "dirt" could bridge some engravings and cause lost pulses.
RE: Rotary Encoders
Also, it is not sufficient to check just one channel. Most encoders have A and B channels, sometimes also /A and /B (complementary channels). Check that phase shift between A and B is 90 degrees +/- a tolerance, usually 20 - 30 degrees.
Also check zero level and high level as well as noise.
Same checks can be made out of the application. Run in a test bench or couple to shaft of asynch motor with a piece of rubber hose. Be careful - make sure that the encoder and motor do not get loose.
There is a glossary h
Gunnar Englund
www.gke.org
RE: Rotary Encoders