I’m still working with a mock up of my 1.5kw water cooled spindle. Had everything up and running on the cnc with all the controls ( vfd and I built a sub panel for the power supply). Has been working ok. Still trying to to find the right springs for the z axis.
Well today I started mocking up the controls for everything before I built an enclosure. I put a relay in the system controlled by a magnetic switch to control power to the vfd, cooling system, and the shapeoko power supply ( 3 pole relay controlling the 3 hots, vfd and chiller use the same power feeds)
Well everything was going fine I could turn on the mag switch. The shapeoko, the chiller and the vfd would all power up fine. Tested everything and it turns on and off as it should. Initialized the cnc, bit setter did it’s thing.
Sent command m3s18000 to test the speed control and I got sparks from the two small pins that I have in the 6 pin connector on the shapeoko for the speed control. Turned it off via turning the relay off. Checked and made sure that the the speed control wires were in the correct locations. Everything was correct , double checked everything Was all correct. . Went through the process again. Got sparks again and it blew the 15 amp 2 pole breaker that feeds the vfd and it blew the 50 amp 2 pole breaker that feeds the sub panel that the 15 amp is in.
So now I disconnect from the shapeoko completely. Go to power up and the vfd will not fire up. No fan no beep no screen display. Check and I have 240v to the vfd. So I unplug the spindle. Still won’t turn on. I can’t seem to find a fuse in the vfd. So I condemn that and go to check the spindle and I get about an 80 v shock with the spindle plugged in if I touch it. Un plug the spindle and I check for shorts. One of the power terminals is shorted to the ground terminal. The other two seem fine. So the spindle is dead.
I have sent a message to the seller on Ali express, only 2 Weeks old to me.
Now I need to check for any other causes. I can’t think of a single thing that would Cause the spindle to short power to gnd. But I want to make sure.
What’s the best way to check the pwm signal from the shapeoko board for issues?
Anyone got any other ideas of what the root cause could be? Other than the spindle deciding to ruin my 5 day weekend on day one?
For reference it is a g penny 1.5 kw water cooled spindle. HY 220v inverter. A cw300ag ( 220v) industrial “chiller”.