I have machines using Fanuc 90-30 PLCs. The home switch for the stepper card has a habit of blinking frequently and without cause. I have replaced the switch, its cable, the home run wiring and the stepper card. I am thinking there is a glitch in the stepper card; does anyone know if this is problem and possible solution?
Horner stepper card
- Thread starter Jim Mo
- Start date
Steve Bailey
Lifetime Supporting Member + Moderator
It could be a DC power supply problem. The voltage could be low or unstable. There could be an intermittent short somewhere in the circuit that doesn't draw enough current to blow a fuse but enough to drag the voltage level down to where the stepper card sees it as a change of state.
The typical Fluke may not be fast enough to see a brown-out that could turn the Home switch input off. Those inputs should come at about 9 volts and go off at about 12 volts.
I would put a trap in logic to how many scans it is lost and maybe at what point in the process.
Also does the system lose "home"?
I would put a trap in logic to how many scans it is lost and maybe at what point in the process.
Also does the system lose "home"?
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