VFD error

[routercnc]

Had a few hours free in the garage this afternoon and got working on the spindle wiring modifications.

End cap came off in the end with more of a sideways pull than the pull-and-twist method I had been using before (thanks for the hints!). There was a trace of sealant around the o-rings which must have been holding it on. Don't see why they used o-rings and sealant. The o-rings are recessed into a shallow pocket and look like they would make a good seal once compressed.

Cleaned all the mating surfaces. Removed the GX16 plug and binned it. Dropped the strain relief straight in (mounting hole of GX16 is 16mm, and strain relief also needs a 16mm mounting hole) and used loctite on the inner nut to make sure it didn't vibrate loose during machining. Pushed the VFD cable through and soldered it onto the motor cables. I used 2 layers of heat shrink over each joint just to be sure.

I had noticed that the end cap was painted black on the underside as well so my plan of using that as an earth point wasn't going to work. Luckily on the spindle body side there is a plastic cover cap held in with three machine screws. Checked these and they were a good earth to the outer body of the spindle, so crimped on an earth terminal and fastened it under the screw head.

All wired up:


I will purchase some new o-rings just in case these have taken on a permanent set - if they decided to leak at some point I wouldn't know until something went bang. For now I've re-used them just to test that it works electrically.

Screwed it together and tighten up the cable gland:



New Huangyang 2.2kW VFD arrived Friday (quick!). It is visually slightly different to the photos on ebay.

I offered up the old spade connectors from the mains line filter and they are much too big for the terminals. The small red colour crimp terminals would fit but then the wire doesn't fit. So I ended up filing the sides down:


All for now.