[One of Many]

Ben,

You might call up Clarkson and see if they have a used or new encoder for that SEM motor.

To check the encoder, either look at the machines schematics where the connector ends up on the input board or find the encoder model and look for a pinout diagram online.

Figure out which pin does what. Power, Ground, A, B, and Z is all you will have from the looks of the terminals on the encoder there. Take note of the voltage that powers up the encoder. It could be 5v or 12v with the outputs typically just below that no more than 1-1.5v. Set up the scope, logic probe or meter range likewise.

Since the machine should power up the device, ground the negative lead of your test equipment close by. Use the signal probe or test lead to verify supply power is getting to the encoder at each end of the cable, then while slowly turning the motor, each pin on the connector that you expect an output signal from. The A&B signals would be very close together pulses and the Z either 1-4 pulses per revolution. The Z pulses are a bit hard to find since there are so few.

The procedure would be the same of you decide to bench test the encoder. The only difference is that you will need to supply the power and ground as that model encoder requires.

Joe has the right idea, if you need to find an encoder on the cheap. The issue will be a different mounting and package size. Hollow shaft, PPR and voltage shouldn't be much of an issue. I'm not a fan of the inexpensive encoder from US Digital. At least get an industrial quality unit rather than one of the plastic types.....



DC