Does anyone have experience with interference from the variable speed drive. I have a wireless intercom that use the house wiring to connect and the static makes it impossible to use. Has anyone used a RF Supressor?
There are at least two (maybe more) types of wireless intercoms that use the power wiring. The older AM (Amplitude Modulation) units were very susceptible to noise pickup. Newer types use FM modulation and work much better. If you have these, you might try ferrite beads on the inverter power cord. These are dark gray cylinders that present a low impedance shunt to high frequencies.
Make sure that the lathe variable speed drive control is properly grounded. You might also try plugging the intercom into a different outlet (either or both). Sometimes that helps. There are also line filters, but if used on the intercom circuit, might not let the communications signals through.
There are no absolutes in any of this. Try different things until it works or you have to give up. Power line noise is tough.
Earle Rich Mont Vernon, NH
I sympathize. This has been discussed before and if you go to:
-and "at.".
frequencies.
The instructions for my Hitachi VFD say to use a dedicated grounding rod for the drive located close by. Also, it says to NOT connect the lathe to the house ground. That is, the grounds are not connected together. For my lathe I put a wire nut on the ground wire as the power cable comes into the lathe's control box. The control box, lathe, VFD and motor are grounded only to the dedicated ground rod nearby. Dan
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