1962 Monarch 10EE Drive Issue

[jbacc]

Good Afternoon,

I recently purchased a 1962 Monarch 10EE from a very nice forum member. I finally picked it up and wired up to 240V single phase as required and it does have Scissio Solid State replacements installed for the Thyratron tubes. I started it up today for the first time and began putting it through it's paces learning the controls and understanding how it works and all was going well. All of a sudden, the spindle shut down and I can't get it to run. The fan is on and it's getting power. I have a couple of extra C3J tubes and I swapped a couple of them through but the problem persists.

I have been reading many threads trying to figure out what the issue is but I am hoping the collective wisdom of you good people might point me in the right direction. I noticed that when I press the control on button, I hear the relay/magnetic switch click but it won't stay closed. It releases as soon as I release the momentary switch. I removed the spindle speed control module and the spindle does not turn.

I attached a link to a video that shows the problem.

Any insight, comments and/or advice would be most appreciated.

Thank you all so very much,

Joe

 

[jbacc]

Doing a little more digging around while being extremely careful, if I push the contractor in the photo below, the other contractor remains engaged until I release this one. The spindle will turn if I hold this contact or other whatever it’s called closed.

 

[jbacc]

C3J tube was the culprit. Sorry for any inconvenience and my sincerest thanks to those who sent me PM’s.

Much appreciated,

Joe