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Author Topic: Noise from VFD  (Read 2470 times)

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Noise from VFD
« on: September 24, 2012, 04:25:54 PM »
This is probably been answered; But as the new guy, please indulge me. I have a VVD and every thing on the drive works fine. I can controll the speed, turn it on and off , use the over rides. But I keep getting random false limit switch trips, I think it has to be noise from the VFD because if it's not running the program runs great, but when the spindle is running I may get 1 trip or 16 trips. Any ideas?

Thanks

Offline Hood

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Re: Noise from VFD
« Reply #1 on: September 24, 2012, 04:51:39 PM »
If using the parallel port you could try increasing the Debounce Interval on General Config page.
If using an external controller then it may have some filtering options in the plugin.
Hood
Re: Noise from VFD
« Reply #2 on: September 24, 2012, 05:01:52 PM »
make sure that your power cable from the vfd is not running alongside or near the limit switch wires. As they are usually 5v they can be affected by the vfd.
Re: Noise from VFD
« Reply #3 on: September 24, 2012, 07:22:39 PM »
Thanks for the replies, I pushed up the debounce time and it cut out most of the false tripping, then I changed the switches from n/c to n/o and that took care of the rest.

Offline Hood

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Re: Noise from VFD
« Reply #4 on: September 25, 2012, 03:09:53 AM »
NO switches for limits/E-Stop are not the best as if something goes wrong (wire comes loose etc) then you will never know until you need them and by that time its too late.
Much better to shield and properly ground the shields if you are having issues.
Hood
Re: Noise from VFD
« Reply #5 on: September 25, 2012, 02:19:34 PM »
Thanks again for the reply. I have a safety back up switch that is also in the circuit. The main limits are non contact prox.