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No volt release switch, repair?

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No volt release switch, repair?

Postby Andyp » 18 Jan 2018, 17:38

Can this be repaired?

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This controls my Triton router and stopped working this morning. If I apply continued pressure to the green button it hums and the router comes on but will not stay on otherwise. I tested it on another tool and the same thing happens so it is not the router.

I do have another one which I rigged up to finish what I was doing but would be nice to fix this.
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Re: No volt release switch, repair?

Postby RogerS » 18 Jan 2018, 18:29

I think the stock answer is to blast it with compressed air to clear out the clag that is stopping the contacts from latching.
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Re: No volt release switch, repair?

Postby DaveL » 18 Jan 2018, 18:32

Andy that unit will have a coil that is connected across the output side of the switch. When you press the green button you manually close the contacts and the the coil holds then closed. The emergency stop button will be in series with the coil, when you press it the coil is disconnected and the contacts are opened. You need to check it the wires for the emergency stop button are still firmly connected. Do you have a continuity tester (ohm meter), you can check if the contacts in the emergency stop button are closed (short circuit) when the button is not pressed.
All of the tests are of course carried out with it unplugged from the mains.

I have an external stop button on my Wadkin table saw and one of the wires came loose, the effect was what you are seeing.

It could also be caused by dust in the emergency stop switch stopping the contacts closing.

Edited to correct the auto correct!
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Re: No volt release switch, repair?

Postby Andyp » 18 Jan 2018, 18:42

RogerS wrote:I think the stock answer is to blast it with compressed air to clear out the clag that is stopping the contacts from latching.


No compressed air here. I will have it apart tomorrow, maybe, and try and give it a good clean though.

I did have a small can of compressed air acquired from ICL may years ago, seems to be empty now.
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Re: No volt release switch, repair?

Postby Andyp » 18 Jan 2018, 18:45

DaveL wrote:Andy that unit will have a coil that is connected across the output side of the switch. When you press the green button you manually close the contacts and the the coil holds then closed. The emergency stop button will be in series with the coil, when you press it the coil is disconnected and the contacts are opened. You need to check it the wires for the emergency stop button are still firmly connected. Do you have a continuity tester (ohm meter), you can check if the contacts in the emergency stop button are closed (short circuit) when the button is not pressed.
All of the tests are of course carried out with it unplugged from the mains.

I have an external stop button on my Wadkin table saw and one of the wires came loose, the effect was what you are seeing.

It could also be caused by dust in the emergency stop switch stopping the contacts closing.

Edited to correct the auto correct!



No ohm meter here :oops: i did make sure all the contacts were screwed down tight. As above. I will try and get to it tomorrow and give it a good clean.
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Re: No volt release switch, repair?

Postby Andyp » 19 Jan 2018, 16:58

Not at all easy to take apart. The bit under the stop button is totally sealed so I could only give the terminals a good blow.

Under the red and green buttons one of bits of plastic above a terminal under the green button has melted.
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Is this as a result of me holding the button in yesterday or could this be the cause of it failing?

I will wire it back in tomorrow.
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Re: No volt release switch, repair?

Postby TrimTheKing » 19 Jan 2018, 17:30

I'm going to guess that's from a hot terminal that was shorting or summat!

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Re: No volt release switch, repair?

Postby Robert » 19 Jan 2018, 23:57

A bad connection = resistance = heat. You may be lucky and have fixed it by cleaning the contacts. A bit of folded wet and dry paper on the contact faces is needed though rather than just blowing dust off.

I'd guess it is unlikely holding the button caused the heat damage. Hope the coil is ok after all this effort.
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Re: No volt release switch, repair?

Postby Andyp » 20 Jan 2018, 15:53

Robert wrote:I'd guess it is unlikely holding the button caused the heat damage. Hope the coil is ok after all this effort.


Cleaned as best I can, as suggested. Just tested again same problem. Only works if green button held down and still hums while doing so.
I'll have a quick google to see if I can find that switch as a component.
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Re: No volt release switch, repair?

Postby Andyp » 20 Jan 2018, 16:09

Seems Axminster do one

http://www.axminster.co.uk/kedu-kjd17-nvr-switch-230v-1ph-950700

Providing I can separate the buttons from the switch itself it should be OK.
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Re: No volt release switch, repair?

Postby HappyHacker » 20 Jan 2018, 17:42

I think you may have problems getting the Axminster switch to fit.

There is one similar to yours on eBay which may be easier to fit. https://www.ebay.co.uk/itm/Safety-NVR-N ... 2868367976

I have no idea on their reliability or sizing in relation to your load requirements.

Good luck
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Re: No volt release switch, repair?

Postby 9fingers » 20 Jan 2018, 22:12

Knowing how much you like relays Andy, you could buy one and wire it up as an NVR? :D

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Re: No volt release switch, repair?

Postby DaveL » 20 Jan 2018, 22:15

9fingers wrote:Knowing how much you like relays Andy, you could buy one and wire it up as an NVR? :D

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Re: No volt release switch, repair?

Postby Andyp » 21 Jan 2018, 10:34

DaveL wrote:
9fingers wrote:Knowing how much you like relays Andy, you could buy one and wire it up as an NVR? :D

Bob


Ha Ha Ha. :)
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Re: No volt release switch, repair?

Postby Andyp » 11 Apr 2018, 15:44

Hasn't taken me long to fix it has it?

The Axminster one fitted perfectly and works as well.

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Re: No volt release switch, repair?

Postby RogerS » 11 Apr 2018, 22:23

Andyp wrote:Hasn't taken me long to fix it has it?

The Axminster one fitted perfectly and works as well.



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Re: No volt release switch, repair?

Postby Andyp » 12 Apr 2018, 06:13

Sorry I gave the wrong impression there. My inertia caused the delay. I have had the switch since February.
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