Does a 220V (2 HP) dust collection system create any feedback that would cause an issue with a 220V spindle/VFD?
Do I need to provide each device a separate circuit in my breaker box?
It could work but really depends on the power draw of the dust collection system and VFD and the size of the breaker in your panel.
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Thanks for the quick response
Sizing the wire and breaker is not an issue.
My concern is if feedback or electrical noise generated by the blower motor effecting the VFD.
If your dust collector has an induction motor, the motor itself won’t cause any interference problems. But the switch or contactor that turns it on and off will have some arcing across it’s contacts when switched on and off. That arcing will definitely generate EMI, which may or may not cause a problem with the VFD. If it does, adding a snubber across the contacts may help, as may adding ferrite ring cores to the power leads of both pieces of equipment.
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Assuming you have a quality VFD, the input power should be filtered and should not be bothered by any line noise. Radiated EMI might be an issue if the switch is close to the VFD or control lines – there could be some level of coupling. Unfortunately, that type of interfere is nearly impossible to debug consistently.
All that said, I’m curious what type of dust collector you have – most run in the 12-18A range, leaving nearly zero head room for the VFD which also needs 5-10 to 20A depending on your unit. I can’t imagine you have a dedicated 30A (or 40A) circuit for the CNC? Maybe 220 would be different - overall amperage would be lower, but still combine would be around 20A.
-Tom
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Hey Dave,
the most important accessory for a VFD is its matching EMI filter.
A VFD works with high internal carrier frequencies which can induce noise into the power system, but the EMI filter also protects the VFD from noise from the power system. The type you need should be mentioned in your VFD manual, e.g.
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Do yourself a favor and run a bare cooper wire inside the flex hose for the dust collector. Ground the end at the dust collector. On the other end I just poked two tiny holes through the hose near where it slides onto the shoe and wrapped it around the wire inside the plastic so the end couldn’t find it’s way down through the shoe and into the cutting path of the tool. I run everything (my 2.2kw spindle, 1hp dust collector, monitor, water pump, lights, controller, and extra power supplies all on one 240v circuit. Toroidal beads and replacing any unshielded wire is also a good idea.
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Hey Alex,
this however won’t prevent the airflow and the plastic to become statically charged. But…
(funny that accent in the video) 
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Putting wire on the outside of flexible hose is kind of hard. You can wrap it in between the spine but that’ll use a lot of wire. It’ll have loads of surface area and work well. Running a wire inside the hose is much easier and does help reduce the static charge. Because the chips are so small from the 1F the wire doesn’t impact the dust collector’s performance. Before I ran a wire inside mine if I got within 2 feet of the hose my hair would start to stand.
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