Axis is lost! Help

[Thejarv]

I have an old Monarch Pathfinder 32 w/ a Dynapath sys.10 controller. It's been retrofit. The flexible coupling between the X-axis drive and the sumtak optcoder (type: LEI-037-1024 source: dc 5v 150mA) needed replacement. I replaced it and when I powered the machine back up, the axis was bouncing back and forth. I believe the encoder/tachometer is out of phase or lost. I've been thrown to the wolves here so any information would be greatly appreciated. When I take the coupling off the axis just keeps feeding until E-stop is depressed.

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[Thejarv]

Basically how do I get the drive and tach in sync? If that's even the problem

[Jim Dawson]

Did you have to disconnect the wires from the encoder? It sounds like the encoder signal to the controller has been lost, or the signal is inverted.

[Thejarv]

No. I only took the encoder off to get the broken flexible coupling. Just the bolts and set screws. I powered down the machine and only removed the encoder mechanically. I kept all the wires connected.

[Jim Dawson]

The only thing I can think of is that a wire is broken or the encoder has just failed. Is there any way you can look at the encoder output from the Dynapath diagnostic screen? Normally a counter of some kind.

[Thejarv]

I'll check diagnostics if available then trace wires to see if broken and get back to you. I appreciate your help!

[Thejarv]

There's no diagnostic screen to check the output. Only 2 pages of parameters (one input, one output) and none of them work with the encoder. The machine used to be a manual and was retrofitted with the motor to control the cross-slide (X-Axis). The guy that worked on the retrofitting and did all the servicing of this machine has retired and can't be of any help. I checked continuity for the wires and no issue.

[Thejarv]

I put machine in handle .001" and it travels .020" normally, then starts oscillating again for approx. .030" then travels normally again for the next .020" then oscillates.

[Jim Dawson]

The only thing I can think of at this point is a damaged encoder. Does the encoder turn freely when turned with your fingers? I used to work on some industrial machines that would experience encoder failures. If you held the encoder against your ear, turned the shaft with your fingers, and heard a little ''tick'' then the encoder was bad....Just a sticky spot in the bearing, but it was enough to confuse the system.

If you own or have access to an oscilloscope, that is the best way test an encoder.

[Thejarv]

I couldn't hear any ticking. I have an oscilloscope coming in on friday. Just have to put the parts on hold until then