Delta dust collector motor Question - Page 2 - Woodworking Talk - Woodworkers Forum
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post #21 of 23 Old 02-05-2020, 07:26 PM
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Thanks, TimPa. I replaced the caps one at a time, so did not change them in the circuit. That makes sense about a start and run capacitor. The replacements are a match for the voltage and capacitance in each case.
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post #22 of 23 Old 02-06-2020, 08:41 AM
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bsandor-


There's a failure mode that, while rare on single phase motors, I've run into twice on dust collector motors.


Dust collectors are often subject to fairly short on-off cycles and at the same time have a high inertia load that prolongs the duration of the start current. This can cause excessive heating of the rotor conductors, softening the Aluminum they're made of. These conductors are connected by a shorting rings that are also Aluminum, cast into the rotor at the same time as the bars. There's a stress riser at the join of the two that can fail when the Aluminum is weakened by high temperature. When the connection to a bar is opened it no longer conducts current. That missing current has to be made up by increased current in the other bars. That causes more heating of those bars on subsequent starts leading to a cascade of failing joints.


This is especially rare on single phase motors because, under these conditions, the start capacitor usually fails long before the rotor does.


When you changed the bearings did you notice anything that looked odd on the rotor? Were there any loose pieces of Aluminum inside the motor housing?


Like I said, that's a rare failure mode. If it it were my motor I think I would want to convince myself that the centrifugal switch is actually working properly. Maybe attach a meter to the start capacitor terminals and make sure there's a solid voltage there when the motor is switched on.
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post #23 of 23 Old 02-06-2020, 10:54 AM
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Quote:
Originally Posted by bsandor View Post
Now it will not start at all - it always trips after a second or two.
so you went from frequent cb tripping, to not running at all - after part replacement. indicators are that: a bad part was installed, part installed incorrectly, or mis-wired. do you have a multimeter and know how to use it? have you tried spinning the motor when power is applied to "get it going"? be careful if the fan is installed, maybe use a stick. have you checked that the motor is getting 120vac (start switch ok)? if you are not familiar with electrical troubleshooting, please get help...
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