Quote Originally Posted by MikeyC38 View Post
Thanks Jazz I'll try that first before getting the EMI filter

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Hi Jazz, manage to get rid of the noise by doing everything you said and using an IEC EMI filter socket for the mains input to the control box, as well as using a ferrite coil around the RS423 Modbus serial connection between the Mach3 PC and the VFD. Now it runs reliably. Got all the bits for my dust filter and about to cut the dust shoe from 10mm perspex. Will post the design and pics soon.

Cheers.
Mike