On 03/15/2015 07:39 AM, Russell Brown wrote:
>
> I promised to report back so...
>
> I fitted the filter (Schaffner FN2030 Series 16A 250 V ac 400Hz) on the
> VFD mains input and that did make a difference.  My failing case job ran
> 70% of the way through where without it the job failed 10% in.  Not the
> complete solution though.

... snip

> So...  finally I replaced the limit switch wires with shielded cable
> (grounded only at the Mesa end).  That seemed to do the final trick and
> the job ran all the way through.

... snip

Thank you for posting your results. I'll have to put shielding a little 
higher on my list. Don't forget about differential signaling, higher 
signal voltage and formal cable termination.

-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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