Need help with 5hp motor - Router Forums
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post #1 of 31 (permalink) Old 06-19-2015, 11:33 AM Thread Starter
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Question Need help with 5hp motor

Hey guys and gals, I just acquired a used "nonworking" tablesaw. It's got a 5hp single phase 220v motor. Initially the motor was packed with sawdust and wouldn't turn. I cleaned that and replaced the bearings. Now it still doesn't always turn, or turns slowly and blows the breaker, (30 amp double pole), and/or turns backwards. There is evidence inside the cabinet that @ one point the blade came flying off, probably due to the motor spinning backwards.

What would cause this?

Jack


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post #2 of 31 (permalink) Old 06-19-2015, 11:37 AM Thread Starter
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Here's a pic of the tag
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Jack


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post #3 of 31 (permalink) Old 06-19-2015, 11:48 AM
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That small writing at the bottom is the problem, it's passed its expiration date.
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post #4 of 31 (permalink) Old 06-19-2015, 12:02 PM
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Quote:
Originally Posted by Jack Wilson View Post
Hey guys and gals, I just acquired a used "nonworking" tablesaw. It's got a 5hp single phase 220v motor. Initially the motor was packed with sawdust and wouldn't turn. I cleaned that and replaced the bearings. Now it still doesn't always turn, or turns slowly and blows the breaker, (30 amp double pole), and/or turns backwards. There is evidence inside the cabinet that @ one point the blade came flying off, probably due to the motor spinning backwards.

What would cause this?
wiring on the motor for the CCW rotation...
not coming up to speed...
start cap no good...
start switch not engaging or disengaging...

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Attached Files
File Type: pdf Motor Trouble-Shooting Chart.pdf (40.5 KB, 398 views)
File Type: pdf motor troubleshooting.pdf (103.1 KB, 86 views)
File Type: pdf meter motor testing.PDF (279.1 KB, 91 views)
File Type: pdf Maintenance and Troubleshooting of Electric Motors.pdf (68.0 KB, 87 views)
File Type: pdf TESTING armature windings.pdf (100.0 KB, 84 views)
File Type: pdf electric-motor-connection-diagram.pdf (414.3 KB, 105 views)
File Type: pdf Testing Motor Capacitors.pdf (331.7 KB, 114 views)

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”

Last edited by Stick486; 06-19-2015 at 12:26 PM.
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post #5 of 31 (permalink) Old 06-19-2015, 12:05 PM
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If there is no damage to the coils, I'd check the starter cap.
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post #6 of 31 (permalink) Old 06-19-2015, 01:28 PM Thread Starter
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I don't see this motor reversing polarity, it's a random shift between the 2 directions. Sometimes it's clockwise, other times its not, just depends...but on what, I don't know.

Jack


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If you cannot stand behind our troops, (and I understand, no judgement here), then please stand in front of them, remember, they're willing to stand in front of you!
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post #7 of 31 (permalink) Old 06-19-2015, 03:25 PM Thread Starter
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Coils LOOK good, how do I verify that they are?

Jack


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post #8 of 31 (permalink) Old 06-19-2015, 03:39 PM
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Quote:
Originally Posted by Jack Wilson View Post
I don't see this motor reversing polarity, it's a random shift between the 2 directions. Sometimes it's clockwise, other times its not, just depends...but on what, I don't know.
read the PDF's attached...
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File Type: pdf How to check the Windings of a 3-Phase AC motor.pdf (235.4 KB, 189 views)

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #9 of 31 (permalink) Old 06-19-2015, 04:14 PM Thread Starter
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Did a quick experiment, tried starting motor with leads reversed on capacitor, then tried starting motor with capacitor discuss connected. Both resulted in the VERY SAME SYPTOMS I have been experiencing right along. Also, when making an effort to discharge the capacitor, there were no sparks or arcing of any kind.

Jack


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If you cannot stand behind our troops, (and I understand, no judgement here), then please stand in front of them, remember, they're willing to stand in front of you!
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post #10 of 31 (permalink) Old 06-19-2015, 04:19 PM
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well, that says it. I smell a cheap fix coming up.
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