saw trips electric

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tomuk30
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saw trips electric

Post by tomuk30 » Sun Sep 19, 2010 11:49 am

hi all . im new to this forum and thought id start of with a problem ive got ,and hopefully get some help my flip saw trips the electric when I try to turn it on ,I was plunging through some decking when it bound on the blade I lifted the saw up and tried release the decking by switching on a few times now it wont turn on and trips the house electrics .looked to get some info off you knowledgable lot.
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Re: saw trips electric

Post by dewaltdisney » Sun Sep 19, 2010 12:08 pm

I had a router did that and the motor was burned out. It sounds similar in that you have a dead short that is knocking out the trip. I regularly blow my tool motors through with compressed air now to get rid of dust build up which I think might be a contributing factor to motor failure. Obviously you need someone to look at it but I suspect a new motor is required.

DWD
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Re: saw trips electric

Post by big-all » Sun Sep 19, 2010 1:09 pm

is the wood still on the blade??
in other words are you trying to turn a jamned blade if so do not turn it on

is you work fully supported so when you cut through the timber dosnt move[fall off]
or at worst you hand can hold it flat when cut through

which flip saw do you have and how old is it ??
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Re: saw trips electric

Post by tomuk30 » Sun Sep 19, 2010 3:01 pm

hi the wood is not on the blade ,the model is DeWalt DW743N
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Re: saw trips electric

Post by tomuk30 » Sun Sep 19, 2010 3:26 pm

sorry wrong model its as follows Dewalt D27105 asking mainly to see if its a simple fix ,as a motor is out of the question at the moment .
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Re: saw trips electric

Post by big-all » Sun Sep 19, 2010 3:42 pm

tomuk30 wrote:sorry wrong model its as follows Dewalt D27105 asking mainly to see if its a simple fix ,as a motor is out of the question at the moment .
funny enough i have the 742

heres the exploded diagram for yours
http://www.mtmc.co.uk/Spare-Parts/Dewal ... 18642.aspx

you need to try isolating things like unplug the saw from the mains and see if it resets
then check the switches arent melted in the on position ect by unplugging and using a meter
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Re: saw trips electric

Post by ultimatehandyman » Sun Sep 19, 2010 4:00 pm

Worn out brushes can cause the supply to trip. I had this with a washing machine once.

You should be able to isolate the electric and then remove the brushes, if they are worn just replace them and that should fix the problem.

In my dewalt chopsaw you can clearly see the brush holder screws on the motor housing, they are like a black blanking plug with a slot in it so that you can unscrew them with a flat screwdriver.
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Re: saw trips electric

Post by tomuk30 » Sun Sep 19, 2010 4:11 pm

thanks will look into that ,
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Re: saw trips electric

Post by big-all » Sun Sep 19, 2010 4:35 pm

its a brushless induction motor uhm :lol:

http://www.dewalt.co.uk/powertools/prod ... no/D27105/
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Re: saw trips electric

Post by ultimatehandyman » Sun Sep 19, 2010 4:47 pm

big-all wrote:its a brushless induction motor uhm :lol:

http://www.dewalt.co.uk/powertools/prod ... no/D27105/

Why then, on the page that you posted to they have a -

297 - BRUSH
BDE-622437-00.1

and a

295 - BRUSH CAP
BDE-622441-00.0

:scratch:
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Re: saw trips electric

Post by tomuk30 » Sun Sep 19, 2010 4:48 pm

hi, what does that mean in relation to checking bushes ,as I am aware of and fitted plenty of bushes in other tools
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Re: saw trips electric

Post by ultimatehandyman » Sun Sep 19, 2010 5:29 pm

tomuk30 wrote:hi, what does that mean in relation to checking bushes ,as I am aware of and fitted plenty of bushes in other tools

Brushes are normally made from carbon and are designed to wear out.

Most machines these days have replaceable brushes like this Dewalt drill-
http://www.youtube.com/watch?v=tECeZi6IfvU

But if Big-all knows that your model does not have brushes, it must be something else at fault.
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Re: saw trips electric

Post by StyXSIS » Sun Sep 19, 2010 6:05 pm

@ BA & UHM, there are 2 versions of that flip saw theres the Standard version & the induction version so your both right.
@ tomuk30, you need to see which version you have you will need to check your manual to see if its a brush driven motor or an induction motor which requiers no brushes to operate.
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Re: saw trips electric

Post by tomuk30 » Sun Sep 19, 2010 6:08 pm

yes will do ,any more ideas at whats the likely fault
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Re: saw trips electric

Post by StyXSIS » Sun Sep 19, 2010 6:26 pm

It could be the trigger ? Or it could be your sockets ring main fuse it should be a 32A fuse and that saw could be overloading the mains from that socket your pluged into because when you pull the trigger the machine pulls alot of amps to start the blade. Try pluging into a different socket outlet as ive found when i checked my mitre saw once it tripped certain sockets and the mains fuse but some others didn't so just give that a go.
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