Wiring VFD to E-Stop

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21

Yeh M5 even! I had tool changes on the brain last night…

It’s a good question, I’m fairly sure if you kill the board it will just coast to a stop. I am wondering more about physically breaking the PWM connection. That I haven’t tried.

This is making me more jealous of you guys and your big spindles.

Join the club :joy:

22

While I don’t have a VFD in front of me (or at all), I would think that ideally you’d set up a spindle kill switch such that:

  • Run mode: “PWM In” on the VFD is connected to “PWM Out” on the controller
  • Kill mode: “PWM In” on the VFD is connected to ground on the controller

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You would then be dragging the “PWM In” line to your signal ground reference just as if the controller were signalling spindle stop. That precludes having a floating PWM input, which would could be subject to noise or other spurious signals.

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23

Hey Luke. I un stacked (two for 220, one for 110) my e-stops in order to be able to shut down the VFD/spindle for tool changes. So the SO3 is on its own e-stop.

When I e-stop the SO3 the spindle winds down very quickly even though the VFD is still on. When I e-stop only the VFD the spindle continues to run for a while.

Do you have everything on one e-stop?

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