Denford Software & Machines

Hello all

Just looking for some info here on the spindle encoder. First off I had a guy repair the Mint 3.28 board which had corrosion due to the battery. Now I don't know if this has anything to with it but I have no RPM reading on the screen display. I believe its working as the spindle speeds up and slows down with different speeds imputed . The override is working, just plain old 0 RPM on the screen . Any ideas on what I need to check ? Thank you for any ideas here. Mike

The spindle has an encoder on the motor, connected to the spindle drive which allows it to regulate the speed, corresponding to the 0-10V Analogue input.
There is a second encoder (belt driven from the spindle itself) which the controller reads to display the current RPM. It may also be using this to regulate the 0-10V fed to the drive?

If your spindle is running up & down OK, but displaying 0RPM, check the connections to the spindle encoder.

The pinouts are on here somewhere. You can check that the A, B & Index lines pulse as you manually rotate the spindle using a meter or even just an LED between the pin & GND.

It does sound like you have a faulty encoder.

Would there happen to be a drawing for the pinouts for the belt driven encoder on this. The encoder is by the British encoder company where can we verify the index pulses from the belt-driven encoder? Thank you Mike

This is my table of wire colours for the belt driven encoder.
I didn't bother with pin numbers - as I kept the original loom, then connected the machine cabinet end of the wire to my motion controller.

Enc 1 - A+ Green
Enc 1 - A- Blue
Enc 1 - B+ White
Enc 1 - B- Purple
Enc 1 - INDX+ Red
Enc 1 - INDX- Yellow

+5v Brown
0v Black

I hope that gives you enough info. If not, let me know & I can have a look inside the plug & translate colours to pin numbers.

Thank you for the response. I have taken the plug apart for the belt driven encoder. My colors and pin numbers are as follows
1-red
2-yellow
3- no wire
4- no wire
5- white
6- brown
7- black
8- no wire
9- green.
I realize the encoder may be bad, but I am just trying to check it all out first a double check before I tear this apart. Thank you in advance for any help and guidance in this matter. Mike

I should have stated and I don't know if I have, that this is a cyclone TU-150E lathe. Mike