gonetopilbara Posted December 13, 2016 Report Share Posted December 13, 2016 Hi, I have a Carbatec 18" scrollsaw. It has an NVR switch (KJD16) which from researching is a style of safety switch where if the switch is on when the main power source is cut causing the machine to stop, it will not turn back on when the power is re-instated. In normal circumstances this is a good thing. I purchased a Proxxon foot switch (NO 28 700). Due to the way the NVR switch operates you cannot turn the machine on and off using the foot switch. Has anyone dealt with this before? Can you get a replacement switch that is not NVR or can you bypass the switch safely using a suitable crimp connector to join the brown wires together and the blue wires together that run in and out of the KJD16 switch? Bill Scrolling Steve 1 Quote Link to comment Share on other sites More sharing options...
JimErn Posted December 13, 2016 Report Share Posted December 13, 2016 this is what I use http://www.harborfreight.com/momentary-power-foot-switch-96619.html If I had the schematic for the VNR, and if it did not use black box sealed components inside it, I might be able to figure a jumper connection, but to me the effort is not worth the price of new switch Quote Link to comment Share on other sites More sharing options...
gonetopilbara Posted December 13, 2016 Author Report Share Posted December 13, 2016 this is what I use http://www.harborfreight.com/momentary-power-foot-switch-96619.html If I had the schematic for the VNR, and if it did not use black box sealed components inside it, I might be able to figure a jumper connection, but to me the effort is not worth the price of new switch I had a quick look. I probably should have mentioned I am in Australia (240v) The other thing is that when the machine loses power the switch automatically turns off, so would this work every time it was pressed? Quote Link to comment Share on other sites More sharing options...
JimErn Posted December 14, 2016 Report Share Posted December 14, 2016 Sorry I misunderstood. Is the NVR switch built into the machine? It does not look like it from the picture I found. Quote Link to comment Share on other sites More sharing options...
gonetopilbara Posted December 14, 2016 Author Report Share Posted December 14, 2016 (edited) Sorry I misunderstood. Is the NVR switch built into the machine? It does not look like it from the picture I found. No problem - should have included pics. They are worth a thousand words. The photos below show the switch that is built into the scrollsaw along with the speed control next to it. What I ended up doing was removing all 4 connectors (2 blue 2 brown) from the switch and getting crimp on spade connectors the same size as the existing connectors that connect the 4 wires to the switch. I then cut one connector from one blue wire and 1 connector from one brown wire and then added a crimp on connector with a spade end to each of these 2 wires after stripping back some of the insulation. Finally, just connected the blue wire to the blue wire and brown wire to the brown wire using these connectors. (final connection is not shown in below photos - already put back together and using before I thought about taking a photo) This bypasses the switch altogether, but allows the speed control to work. The switch has been put back to keep dust out, look nice and be there should it ever need to be connected, but is disconnected. The only downside for someone who is unaware is that if the machine was ever plugged into a normal outlet or powerboard without the proxxon foot switch plugged in the machine would automatically come on as soon as there was any power applied. Not the most elegant solution, but it works for me. Possibly better solution would be a normal on/off switch the same size that is not NVR (meaning it will work with the constant on/off of the footswitch) Note: In Australia as this is a 230v circuit this work must either be done by a qualified electrician or checked and passed by a qualified electrician prior to use. Never ever work on anything with the power plugged in even if it is off. Don't play with electricity if you don't understand it. You can't see it and some components can hold charge. Edited December 14, 2016 by gonetopilbara Quote Link to comment Share on other sites More sharing options...
stoney Posted December 14, 2016 Report Share Posted December 14, 2016 I looked up the Proxxon 28700 switch and see it is a 2 pole switch which should work fine for your application. As far as your concern about the saw being turned on if plugged directly into a outlet as long as it is your saw I don't see a problem. I think if it was me if I decided to get rid of the saw I would just reconnect the switch before putting it up for sale and all should be good. Quote Link to comment Share on other sites More sharing options...
woodduck Posted December 14, 2016 Report Share Posted December 14, 2016 Hi Bill I am also from Australia & my first saw was the same one you are talking about ,I am a electrician & i had the same problem & cured it in exactly the same way as you did. Cheers Peter Quote Link to comment Share on other sites More sharing options...
gonetopilbara Posted December 14, 2016 Author Report Share Posted December 14, 2016 Final tip from the switch maker themselves. This was in relation to a question about if the switch could always be left on at the powerpoint. Bill, There's no reason to leave the power always on. It is wise to switch power off after a scroll session, not just for the reasons you mentioned (inadvertent actuation of the footswitch by another person) but also for your physical safety during blade changes or other saw adjustments. Further, if lightning strikes the power mains, devices like the scroll saw are more likely to survive unscathed if they are fully switched off or disconnected. The foot switch only interrupts the active line, it does not disconnect neutral or earth. Regards, Mark Proxxon World Quote Link to comment Share on other sites More sharing options...
stoney Posted December 14, 2016 Report Share Posted December 14, 2016 (edited) Final tip from the switch maker themselves. This was in relation to a question about if the switch could always be left on at the powerpoint. Bill, There's no reason to leave the power always on. It is wise to switch power off after a scroll session, not just for the reasons you mentioned (inadvertent actuation of the footswitch by another person) but also for your physical safety during blade changes or other saw adjustments. Further, if lightning strikes the power mains, devices like the scroll saw are more likely to survive unscathed if they are fully switched off or disconnected. The foot switch only interrupts the active line, it does not disconnect neutral or earth. Regards, Mark Proxxon World If I read your comment correctly are you suggesting that the scroll saws switch interrupts the neutral and also the earth (ground) and if not what is your point? It is pretty common knowledge that the best protection is obtained by a complete physical disconnection from the power source ie. unplugged. Edited December 14, 2016 by stoney Quote Link to comment Share on other sites More sharing options...
gonetopilbara Posted December 15, 2016 Author Report Share Posted December 15, 2016 If I read your comment correctly are you suggesting that the scroll saws switch interrupts the neutral and also the earth (ground) and if not what is your point? It is pretty common knowledge that the best protection is obtained by a complete physical disconnection from the power source ie. unplugged. Simply asked the proxxon rep if it was safe to leave it on. Assumptions are the mother of all f...ups Quote Link to comment Share on other sites More sharing options...
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