NVR switch

[rayf6604]

Has anyone had one of the fail and does it tend to go gradually? I can't believe it, I'm in the middle of making all these pens for the fair and my lathe has started switching itself off randomly. The NVR switch clicks and off it goes. The switch started not feeling quite as positive as it has been. Is this a sign that the switch is starting to fail? I'll call Axminster in the morning as its still under warranty. So far I've only been drilling blanks when it's happened, but it'll be fun if it does it while turning

 

[Buckeye]

It might be worth unplugging everything and cleaning the contacts in the NVR.

Peter

 

[Twister]

Hi Ray

my bandsaw has this issue and is a PITA
my problem is the spade connectors on the back being "touchy"
I cut them off and replaced with new ones
only trouble is that i just crimped with pliers and they are no better
i must get the soldering iron out

for now it is hanging out the side of bs and i just give them a wiggle

Steve

 

[rayf6604]

It might be worth unplugging everything and cleaning the contacts in the NVR.

Peter

I haven't looked closely at it Peter, but it looks pretty sealed, meaning I wouldn't think dust could get to it, but I suppose it's possible, I'll have a look tomorrow. Thanks for the suggestion

 

[Neil Lawton]

NVR's fail all the time!
I've replaced about 15 since 2010! (not in my own stuff, but for work)
Axminster show a replacement but are constantly running out of stock, due to demand. I'd link to it, but Axminsters site doesn't work today.
I rang to tell them, but they know and can't resolve it at the moment!

 

[rayf6604]

Is there an alternative type of switch I could use instead of an NVR?

 

[Buckeye]

Is there an alternative type of switch I could use instead of an NVR?

You could cut the NVR out, but I wouldn't.

Peter

 

[Neil Lawton]

No Volt Reset switches are there to protect you.
Any power cut would turn off your machine, but it would turn straight back on when the power re connected, without the NVR.
They also stop induction motor's "spiking" the mains, and knocking out modern sensitive trips.

 

[rayf6604]

No Volt Reset switches are there to protect you.
Any power cut would turn off your machine, but it would turn straight back on when the power re connected, without the NVR.
They also stop induction motor's "spiking" the mains, and knocking out modern sensitive trips.

Thanks for that Neil. I'll call Axminster tomorrow and see what they say. I'll also have a look to see if the one that's there needs cleaning as Peter suggested. It still works but switches itself off sometimes.

 

[bellringer]

As you say it only when drilling i wonder if the motor is drawing to much current and tripping


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[rayf6604]

As you say it only when drilling i wonder if the motor is drawing to much current and tripping


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It was doing it when there wasn't any load on the motor so I don't know. I'll see what it does tomorrow.

 

[bellringer]

What lathe is it


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[rayf6604]

What lathe is it


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It's a Jet 1220 non variable speed

 

[wm460]

A bugger when things like this happens.

 

[Penpal]

I would bless the day they were invented and seek to keep it in your machine mate I know its a worry now as I see it the mass manufacture, making things smaller cost cutting etc. They are mandatory on all OH&S requirements for workshops etc Schools as a safety I always think of that statement I could not fix your brakes so I made the horn louder.Trust the firm helps you my experiences as a sparky seeing them work in industrial situations for fifty years tells me they are a winner, what happens the switch energises a relay normally equipped with suitable long lasting contacts, when starting a normal motor the initial current rush can be up to a peak of 40 amps momentarily AC current alternate in a cycle if you hit a peak in the cycle its very high.

In your lathe you have no variable speed controller so thats a good reason to transfer that arcing potential from the switch to a relay. No such thing as a free lunch using 240 volt power IMHO. Having connected a million connections with crimp fittings they are mostly bullet proof a method.

Peter.

 

[paulm]

Its a bugger but you're much safer having it on there. These things only happen when its important though