Dust Collector Motor Won't Start

      Hums but doesn't move? Probably a blown starter capacitor. August 21, 2012

I have a Delta AP400 dust collector; itís fairly new with low hours on it. I had it hooked up to my planer this weekend and it died. You can hear the motor humming but it wonít spin.

I took it out of the collector housing. Nothing caught up in the impeller - if you give the impeller a slight push, it spins right up. I took the motor apart, cleaned the armature, blew out the little bit of dust inside, reassembled, no change.

Can I buy a new motor? Is it worth it? Or should I take it to a small electric motor shop for repair? I couldnít find brushes on this motor?

Forum Responses
(Dust Collection and Safety Forum)
From contributor S:
It sounds as though the start capacitor is defective. The start capacitor tells the motor which direction it's supposed to run, and provides a little extra current to get it started. The capacitor is normally enclosed under a sheet metal cover and attached to the side of the motor.

Since you were able to start the motor by giving it a little help, I'm betting the capacitor is bad. Most capacitors spit some nasty stuff out of the end where the wires connect when they blow, but not always.

A motor shop can test it and fix you up with a new capacitor. There are two ratings printed on the old capacitor, one stated in "mfd" (microfarad), and the other in volts. You can exceed the capacitor ratings some, but never go less than the ratings.

If this is a three phase motor, there will not be a start capacitor, in which case you have other issues.

From contributor L:
The DC has a 1HP 1PH motor. It should have a starter capacitor. Probably bad. So I agree with the above assessment. Should be a simple fix if you can find the correct capacitor.

From contributor D:
Yes, a bad capacitor is #1, but other things can also cause the problem. The motor has some sort of a starting switch, either mechanical or electronic. If it is mechanical, make sure it is making contact when the motor is stopped. If it is not making contact, the start winding will not be active and the motor will not start. If you are able to make an adjustment, also make sure the switch is open when the motor is up to speed.

Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?

Have you reviewed the related Knowledge Base areas below?
  • KnowledgeBase: Knowledge Base

  • KnowledgeBase: Dust Collection, Safety, Plant Management

  • KnowledgeBase: Dust Collection, Safety, Plant Management: General

    Would you like to add information to this article? ... Click Here

    If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to
    review our Forum Guidelines.

    Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map.

    When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses.

    Return to beginning of article.

    Refer a Friend || Read This Important Information || Site Map || Privacy Policy || Site User Agreement

    Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page.

    Contact us to discuss advertising or to report problems with this site.

    To report a problem, send an e-mail to our Webmaster

    Copyright © 1996-2020 - WOODWEB ® Inc.
    All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor.
    Review WOODWEB's Copyright Policy.

    The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk.

    WOODWEB, Inc.
    335 Bedell Road
    Montrose, PA 18801

    Contact WOODWEB

  • WOODWEB - the leading resource for professional woodworkers

      Home » Knowledge Base » Knowledge Base Article