VFD Has defantly blown up now!

[Boyan Silyavski]

Could it be that it shorted inside? Measure the coil's resistance. It may be water damaged? Then open, clean , dry and thats it

[Clive S]

Could it be that it shorted inside? Measure the coil's resistance. It may be water damaged? Then open, clean , dry and thats it

I very much doubt it

[Boyan Silyavski]

I very much doubt it

You may doubt it as much as you like, but once when i was cleaning my spindle by mistake i used compressed air and that's what happened. So i had to open, dry , close again and it worked. i have seen on forums some people that have a leak and when closed the leak, then all was fine. It takes a minute to measure if its shorted to body.

[charlieuk]

New spindle and vfd arrived from cnc4u and I have replaced them wire for wire. Are there any tests I can do to make sure all is ok before I do any damage? We think the fault was at the plug so I have soldered the wires this time as suggested. I did not set up my original and I'm terable at reading (dislexia) and I'm just trying to establish if there is anything that I need to program on it. The new one has a little dial for sped I asume however the old one was set up for the speed to adjust on Mach 3? I'm terafied of turning it on and it going bang again!

[Clive S]

Ok First with the spindle wires (three of them) if you have them connected incorrectly it will run in reverse so when you first start it check to make sure it is spinning the correct way. If it is wrong just change over any two of the wires.
You can do this at the VFD end on the U:V:W terminals.

You will have to ask cnc4you if the parameters have been set up in the VFD. The Chinese ones quite often need to be set. There is a list of them on the forums some where.

[Neale]

Back when I bought my VFD and spindle from CNC4YOU, they came already configured for front-panel control of speed and needed tweaking for Mach3 speed control. But that was over 5 years ago. Good news is that the same VFD and spindle are still working and in regular use!

[charlieuk]

I have been trying to look at the manual but most of it is going straight over my head and im not sure what much of it means, they did mention it should be set up but looking at the instructions and what you say maybe its not? what are the things that I should be checking? im assuming some how I can power it up to look and not blow anything up?

[magicniner]

New spindle and vfd arrived from cnc4u and I have replaced them wire for wire. Are there any tests I can do to make sure all is ok before I do any damage?

If you have metered across the phase wires in pairs and all 3 sets of windings read similarly and you've metered the resistance to earth too and that reads open circuit then your motor is fine and you shouldn't be able to damage a VFD with it.

- Nick