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Problems with Delta Unisaw Options
MLGoodwin
Posted: Friday, October 07, 2011 7:52:30 AM
Rank: Newbie
Groups: Member

Joined: 5/1/2007
Posts: 0
Location: Croswell, MI
I have a Delta Unisaw that's giving me problems. It will only run if you hold the start button in. If you let go, it turns off. I don't have much electric motor repair experience. I think I've narrowed it down to a capacitor or the centrifugal switch. It's a 230V, 1 phase, 3 hp. motor. It's the original motor made by Marathon for Delta. I only have 1 table saw, so I need to get this thing back up and running! Thanks in advance.
MLGoodwin
Posted: Friday, October 07, 2011 1:39:11 PM
Rank: Newbie
Groups: Member

Joined: 5/1/2007
Posts: 0
Location: Croswell, MI
Where is the switch relay located? I changed out the "remote power switch" that we use to turn it on and off with an identical one off of my bandsaw, but still did the same thing. I just pulled the motor off of it a few minutes ago and will probably take it somewhere and have it checked out. The junction box where the wiring is located was packed full of dust. Whoever worked on it last did not replace the foam gasket under the cover. Surprised it hasn't gone up in flames!
John F. Mason
Posted: Saturday, October 08, 2011 10:01:30 PM
Rank: Newbie
Groups: Member

Joined: 9/16/2007
Posts: 0
Location: N. Hollywood, CA
I think I can help. I recently bought two delta unisaws and had a similar problem with my 3 horse power one. In the back of the on off switch is a sensor that can trip the switch so it is off when putting a little bit of strain on the saw. Crank that up 4 clicks higher and you won't have that problem again. I went and bought a new switch thinking that was the problem but it did it again. The district electrician showed me the voltage sensor or whatever it is and we turned it up. I hope I helped you.

John Mason
San Gabriel High
Woodworking Instructor
MLGoodwin
Posted: Friday, October 14, 2011 7:39:39 AM
Rank: Newbie
Groups: Member

Joined: 5/1/2007
Posts: 0
Location: Croswell, MI
Well I think I got it back up and running. I pulled the motor out and had an electrician check it out. He said it was pretty dusty inside. Everything looked OK. He replaced the internal switch on it. He said the contacts were slightly burnt. I brought it back, hooked it up, and it seemed to work. For the first five minutes. Then it was back to the same problems. I decided to remove the large starter on the back of the saw. I took it apart, cleaned the dust out of it, and shined up the contacts under the armature. Put it back together, and it worked for the last two class periods of the day. I have a new starter coming, but I think I'll put it on the shelf just so I have one.
roleplayerno1
Posted: Thursday, November 03, 2011 9:21:31 AM
Rank: Newbie
Groups: Member

Joined: 11/3/2011
Posts: 0
Location: Nanjing
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