mid-7604 not detecting limit switch

[sppelletier]

Hi there,

I have a stepper motor PI M-110-2S plugged in a NI MID-7604.  I have been using this setup for about 3 years without any problems.  Now it seem t hat one of the limit switch (signal negative) is not reading anymore.  I’m not sure if the problem come from the stepper motor or the motor drive, but I need help to diagnose it.  I have tried to check the signal between pin #7 and pin #8 and I get a constant 5V.

Any help would be greatly appreciated as my product line is down because of this problem.

Thank you,

[AnalogKid2DigitalMan]

Have you tried to activate/deactivate the switch manually to see if there is a change of state?

Could be a defective limit switch, what type is it (mechanical, optical, magnetic...)?

-AK2DM

[sppelletier]

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@AnalogKid2DigitalMan wrote:

Have you tried to activate/deactivate the switch manually to see if there is a change of state?

Could be a defective limit switch, what type is it (mechanical, optical, magnetic...)?

-AK2DM

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I think that I've finally nailed it.  I have been able to try another stepper that was on another production station and it's working fine.  So the problem come from the stepper itself. The reverse limit switch doesn't seem to be working. I think the limit switch is a hall effect detector.

I'll keep you updated.