Question about Delta Machinery Unisaw 3 Hp Left Tilt Table Saw with Unifence

2 Answers

When I push the start button, the motor starts,

When I push the start button on my deta unisaw, the motor starts, but the moment I take my finger off the start button, the motor stops again.

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  • ljudh Nov 21, 2009

    The Start/Stop switch in the front is wired to some kind of relay box in the back of the saw. When you hit the start button, the signal goes back to this box. The power from the wall socket feeds into this box. The line that goes to the motor passes through this box. There are relays in the box but also a transformer and what looks like a switch of some kind and then another unit. So it doesn't look simple to me. Any one of these pieces might be defective or the wiring done wrong. The machine was somewhere else for awhile and I've heard that they may have wired the Start/Stop differently perhaps because it didn't work. But I am not sure.

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  • Master
  • 1,498 Answers

Hi there,

The symptoms you are describing indicate an overload state. According to page 14 of the operations manual, the proper course of action is to wait 3-5 minutes and try again.

If it continues, to contact a qualified electrician.

Doesn't really give a lot of help though, does it. Prior to such measures, I'd check on the following:

  • The cord is in good shape. No frays.
  • Is the power cord warm?
  • Is there an extension cord involved?
  • Is this a recent development after a recent event?
  • Does the action on the switch feel any different?
  • Is there anything else on the same circuit that could cause a low voltage situation?
My gut feeling is the switch is no longer locking and needs to be replaced.

If the unit is still covered by warranty, exchange it. If not, the web site in the Link above is also the source for parts.

I cannot be more specific without your exact model number.

Best regards
Mike

Posted on Nov 21, 2009

  • Justin Case
    Justin Case Nov 22, 2009

    So it used to work.
    It was loaned out
    When returned it had these symptoms.

    Ok, I need to look something up. In the meantime, some questions.


    • How comfortable would you be working with electricity?

    • Can You identify a relay? Its configuration?

    • Can You identify the coils and poles of a relay?
    If you feel up to it, one way or another we will get this going


    Mike

  • Justin Case
    Justin Case Nov 22, 2009

    With a relay in the picture here is the normal startup sequence:


    1. Press the Start button

    2. Relay is Energized

    3. Normally Open contacts on relay are Closed

    4. One set of contacts powers the motor

    5. Another set of contacts continues to power the relay after the Start button is released
    The power to the relay is not getting there. The problem could be a wire that came loose (unlikely) or the Stop Switch

    The Stop Button is a Normally Closed Switch that the power for the relay runs through. When pressed, the relay loses power and reverts back to it's 'Normal' state, contacts open, the motor stops.

    If the Stop Button was pressed and didn't pop all the way back out, that would perfectly mimic the symptoms being presented.

    To check this, you need a meter:


    • PULL THE PLUG, DISCONNECT THE SAW FROM THE WALL POWER

    • set the meter to measure Ohms or continuity.

    • Put the leads on the two contacts of the stop switch

    • The reading should be zero resistance or a beep

    • Pressing the stop button should read infinite resistance.

    • Anything else the switch is faulty, the cause of your problem and needs replacement
    Mike


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  • Master
  • 770 Answers

It sounds like a bad switch. The circuitry on that saw is not that complicated and I believe the switch is held in by 2 screws and will lift right out. You can probably test it at radio shack and if you don't want to order an OEM replacement and don't mind an aftermarket looking switch, radio shack can sell you one that will work. Good Luck. I hope this is helpful!

Posted on Nov 20, 2009

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Posted on Jan 02, 2017

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