About electrical enclosure

I have seen quite few posts talking about lots details of electrical enclosure for VFD and others. From what I learnt, I have draw a diagram with component connections. I just want to get feedback to avoid any mistakes, before I really start to build it. Below is the diagram:

I have collected the major parts, like 2.2kw water cooled spindle and Hitachi WJ200-022SF VFD. Please recommend the following items if you know that can be matched to the spindle and VFD:

  • NO emergency switches
  • EM filter1: before power input to VFD
  • EM filter2: between VFD output and spindle
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Perhaps you could also add your plans for the earth grounding and shielding connections in your drawings. I have the same VFD series, but did not add any components after the VFD - I believe the manual mentions the option for a radio noise filter and an AC reactor. I followed much of the content in Clough42’s video series (ATC Spindle Parts 1, 2, and 10 in particular) as it most closely resembled the functionality of my Masso G3 ATC build.


Hey Jasper,

the spindle coolant pump is usually switched on and off by the VFD, not the CNC Controller. VFDs have outputs specially for that, and only the VFD knows when and how fast the spindle runs, also the usual cooling stations are able to switch an alarm if the coolant temperature or the water flow are not in
the allowed range, and VFDs have inputs for receiving that and are able to stop the spindle then.

Also VFDs like the WJ200 offer the wiring of a smart Emergency Circuit (it’s in your VFD manual), which also can take care of halting the g-code program of the CNC controller in case of spindle error.

If you have a Hitachi WJ200, the manual contains information about both topics.

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Hi @TMToronto and @Aiph5u, thanks for your great feedback.

Based on your comments and the other great posts in the forum and Clough42’s videos, I have updated my circuit diagram as the following:

My plan is the following:

  • 110 V power supply will power on both Onefinity controller and the contactor to VFD.
  • When VFD is tripped, or when the emergency red button (not the one on Onefinity controller box) is smashed, it will trigger the ESTOP of Onefinity controller. I don’t have any other emergency stop button to cut off the power, except the one on the Onefinity controller box. I will babysit the CNC, so not sure if I really need one.
  • VFD will prepare to accept trip in signals due to anomalies of spindle coolant speed and temperature or enclosure door or others.
  • Spindle coolant pump will be controlled directly by the VFD alarm relay and the relay will be closed when the spindle is in the RUN status.
  • The thick green line indicates the grounding wiring. I may not draw all the grounding wires for every components.

Could you please help check if my diagram or plan has any issues?

Thanks a lot, and wish everyone happy holiday.

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