Larrys Metal Fab
Plastic
- Joined
- May 6, 2017
When I press the start button on my lathe, the contactor kicks in but releases as soon as I let go of the start button.
I have gone over the troubleshooting section, and nothing seems to work.
For some reason my field failure relay is not being energized. I tested the resistance of the coil of this relay, and got a reading of 8.7 ohm's. I got a reading of 155 ac volts between circuit 73, and f2 . I know it should be about 145 volts but it's been running for many years. I also checked the resistance of the shunt field between f1 and f2 and got 115 ohms.
If I short out the contacts on the field failure relay, the lathe works fine other than the dynamic braking does not work. I only test by jumping the relay terminals for troubleshooting because I don't want to screw anything up. I've had this problem many times before but like a big dummy I never documented how I fixed it. I'm trying to figure it out all so hopefully you guys can help me with this. I have changed the tubes numerous times and it doesn't seem to help.
I have cleaned and adjusted all the contacts in the main contactor so I know I'm good there.
I think I've only made a couple posts on this site and I always got great answers. I really appreciate you guys and the time you spend answering questions about these fantastic lathes.
Thank you again for all the great work and information on this site.
The long winded
Larry B
I have gone over the troubleshooting section, and nothing seems to work.
For some reason my field failure relay is not being energized. I tested the resistance of the coil of this relay, and got a reading of 8.7 ohm's. I got a reading of 155 ac volts between circuit 73, and f2 . I know it should be about 145 volts but it's been running for many years. I also checked the resistance of the shunt field between f1 and f2 and got 115 ohms.
If I short out the contacts on the field failure relay, the lathe works fine other than the dynamic braking does not work. I only test by jumping the relay terminals for troubleshooting because I don't want to screw anything up. I've had this problem many times before but like a big dummy I never documented how I fixed it. I'm trying to figure it out all so hopefully you guys can help me with this. I have changed the tubes numerous times and it doesn't seem to help.
I have cleaned and adjusted all the contacts in the main contactor so I know I'm good there.
I think I've only made a couple posts on this site and I always got great answers. I really appreciate you guys and the time you spend answering questions about these fantastic lathes.
Thank you again for all the great work and information on this site.
The long winded
Larry B