|Forum topic by JMB||posted 11-30-2015 01:06 AM||971 views||0 times favorited||19 replies|
11-30-2015 01:06 AM
I finally tracked down a new old cabinet saw to replace my old old contractor saw.
It’s a 1985 Delta Unisaw. Part number on the manual is delta 422-04-651-0012
Bought it used. Tested it at the guy’s shop prior to purchase – started right up. So I pay the guy, load into my trailer, bring to my shop, load in, stick it in the corner to deal with later.
Two or three months go by while I get around to adding a 220 line to plug the thing in.
My electrician finally runs the 220 line and outlet last Friday.
Today, I decommission the old contractor saw, sweep up, and drop the new cabinet saw into place. I plug it in. Turn it on. Aaaaaand….
IT WON’T SPIN.
All I get is a buzzing sound from the switch housing. The start button won’t even stay down. It’s like the solenoid is not closing correctly. I tried pushing down the little tab inside the switch housing, which forces the contacts closed. Still buzzing, and the motor spindle spins INCREDIBLY SLOWLY. It’s like it wants to start up but cant. Like the polarities are conflicting with one another.
Here’s what I have done so far:
Removed incredibly heavy 80 year old three phase motor from saw.
Lost grip on incredibly heavy 80 year old three phase motor, dropped said motor inside saw cabinet housing, by way of fingers, and ultimately pulley.
Bruised, nearly broken finger
Definitely broken Pulley.
Yell. Curse. Smoke a ciggarette. Do something else. Return to problem after heart rate returns to normal.
Carefully lift incredibly heavy motor out of cabinet, into the light of day, to assess.
Remove cover plates and assess interior of motor housing.
Blow out dust.
Go get eye protection.
Blow out the rest of the dust.
Attempt to start again.
Buzzing sound. No spin.
Check power supply:
Voltmeter leads from power plug to switch red/white 120, red/black 240, black/white 120. Good so far.
Voltmeter leads from switch to motor:
With Switch off and tool plugged in: Zero Voltage across both phases and leads. To be expected
While holding the start switch down: Buzzing sound, random voltages (all over the place), nothing anywhere near 120 or 240 for any combination of black, white and red. 60V is maybe the highest I note. Not sure what that’s about.
Checked wiring diagram on motor housing. Open wiring housing and double checked all wires. 3 and 8 are reversed. (AHA!!)
Attempt to turn on from switch.
Buzzing sound, no / slow spin (What the heck???)
Smoke another cigarette.
Double check wiring diagram for switch. All looks correct.
Write this post.
Thoughts??? Because I am ALL OUT OF IDEAS.
Thanks in advance.
Edit: This motor either does not use capacitors, or they are incorporated into the motor housing in some way that makes them not readily apparent. As there are not the usual one or two humps on the outside of the housing which would be the tell tale placement of a capacitor.
-- If I can't fix it, it wern't broke in the first place!