SupraBob
Plastic
- Joined
- Apr 18, 2019
- Location
- Grants Pass, Oregon
I bought a 1957 Monarch 10ee that was converted to a frequency drive and 3 phase motor system. The motor is by EBC (Equipment Builders Co.) and is 2hp. It has a 145TC frame and mounts directly to the backgear gearbox. The Cat number is EB002-4FKA. It is made in China and I could not find to much information about it. It does not have anything on the motor plate that says it is inverter ready. The motor looks ok, but I would guess it probably is cheap. The frequency drive is a Hitachi SJ200. It is for a 1.5/(2) hp motor. Single phase 220 a/c in with 3 phase output. The lathe has worked perfectly for the last 2 years until recently. The problem first started when I would turn the lathe off and it would not restart. A F004 would show on the drive. I would just hit reset on the drive and it would run again. This has been going on for 6 months. Now, when I try to start the lathe it starts to go and then studders and stops. a E02 error shows. I can get it to run if I start with backgear engaged. It still studders a little bit on initial start, but runs. The E02 says to check the spindle is free. I took the motor and backgear out of the lathe and I spun the pulley with both backgear engaged and disengaged. Smooth as silk. I then turned the spindle by hand and it was also smooth. It also says to check for shorts, but no wires seem to be loose. But then I discovered something very interesting. I started lathe with backgear engaged and it ran. I then touched the speed control and I got a mild electrical shock. The lathe actually rests on 4 X 4 wood posts and when I touched the speed control I was barefooted on concrete. I put my tennis shoes on and touched it again and no shock. So somewhere electricity is leaking and wants to go to ground. I am looking for advice on what to do. Should I buy a better USA motor and try again? Should I buy a new frequency drive and try it on the Chinese motor? Maybe I should buy both. Any suggestions on troubleshooting would sure be appreciated by this hobby machinist.