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Table saw turns off with use

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Forum topic by turnerbjt posted 02-02-2019 02:12 AM 623 views 0 times favorited 10 replies Add to Favorites Watch
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turnerbjt

18 posts in 1332 days


02-02-2019 02:12 AM

I bought a used grizzly g1023 a couple of years ago and ever since I bought it after a minute or two of use it will turn off by itself. It has a 3 hp motor and I run a regular kerf combo blade. I would wait a minute or so and I could turn it on again.
I thought maybe the motor was dirty and overheating so I cleaned it and the bearings feels smooth and it still did it. There is no motor housing, so it gets plenty of airflow. I put up with it for last couple of years with making small projects because I usually didn’t run it for over a minute. But now that I am making larger projects and it’s happening more frequently I need to figure this out.
What are the different things that trip the magnetic off/on switch? I would figure only a couple, maybe heat and increased power draw. Has anyone ever ran into this with their table saw?
I’m not sure if I need a new switch or new motor. Can anyone give me any troubleshooting tips?

Thanks,
Brett


10 replies so far

View Stowerscw's profile

Stowerscw

25 posts in 674 days


#1 posted 02-02-2019 02:49 AM

Could be a capacitor. I think most bigger electric motors have two capacitors, one for starting and one for running. Unfortunately that about sums up my knowledge on the subject. Best of luck!

View MrUnix's profile

MrUnix

7506 posts in 2742 days


#2 posted 02-02-2019 04:21 AM

Is it the original motor or a replacement one? NEMA or IEC starter? How about a picture of the motor data plate and starter… need more info.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View JohnDon's profile

JohnDon

89 posts in 1712 days


#3 posted 02-02-2019 05:52 AM

Does it turn off even when idling (not cutting anything) or only under a load? Not familiar with the wiring, but if it cuts out while not cutting, you should be able to bypass the switch with jumper wires and run the motor safely (not coming near the blade, or remove blade). That way you can rule out switch vs motor. Also, check to see if you have any loose electrical connections. just my $0.02

View WoodenDreams's profile

WoodenDreams

806 posts in 454 days


#4 posted 02-02-2019 06:38 AM

I’ve accidently turned off during use, my table saw and also my router table by leaning into the switch with my leg while feeding the wood.

View CaptainKlutz's profile

CaptainKlutz

1957 posts in 2037 days


#5 posted 02-02-2019 08:35 AM

hmm,

Have you checked the amperage levels when saw is running?
[Needs to be within normal name plate rating]

Have you check capacitors?
Have you checked the surface temperature of the start and run capacitors?
[Is one of capacitors partially shorted or fialing, which can generate a lot of extra heat/current, forcing overload to react.]

Did you check the overload relay inside the magnetic switch when it shuts down?
[Is oeverload relay reason for shut off?]

To isolate if overload relay is failing, or if motor is drawing too much current – and relay is doing proper job;, need to check motor amperage and voltage across overload relay as it fails. Challenge is you can have a failing capacitor that draws excess current or loose wire; or the overload is failing when it shouldn’t. They both can sometimes act same from outside looking in.

Here is decent description of what is inside magnetic starter:
http://wiki.vintagemachinery.org/Motor%20Starter%20Wiring%20Diagrams.ashx

If overload relay is prematurely failing, mfg will recommend replacement of entire magnetic switch. Depending on magnetic switch, can some times replace just overload relay. PN & mfg can usually be found on relay.
Capacitors are easier to find.

Best Luck!

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View knotscott's profile

knotscott

8343 posts in 3918 days


#6 posted 02-02-2019 03:48 PM

The first thing I would check is the capacitors, then the switch.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View WhyMe's profile

WhyMe

1184 posts in 2104 days


#7 posted 02-02-2019 06:24 PM

Are you using a long extension cord to plug in the saw?

View turnerbjt's profile

turnerbjt

18 posts in 1332 days


#8 posted 02-03-2019 04:56 PM

Wow thanks for the responses. I will go take pictures and measure the length of it’s electrical cord and report back

View turnerbjt's profile

turnerbjt

18 posts in 1332 days


#9 posted 02-03-2019 05:33 PM

I ran the table saw under no load and at first it ran for 4:57, then 30 second intervals it ran for 1:30, 1:26, 1:01, 0:59.
The length of the cord from the outlet to the switch is 15 feet.

View Woodchuckswife's profile

Woodchuckswife

30 posts in 1853 days


#10 posted 02-04-2019 07:31 PM

Mine went bad after about 10 years use, It was the starter winding ,it would run untell it would get hot and then shut down , with no motor repair shops around here it was a new motor. I called grizzly and the teck told me What the problem was right away, as he said they had a few of them before. cost of repair was very little less than new motor and no warnt. had new motor in 4 days, cost was just under 500.00 with shipping. shipping was almost 100.00 bucks. the new one is about 8 years old now, running great now. Mine is just like the picture except it has a motor cover that you can not see the motor Good luck on the repair.
Chuck

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