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N.V.R. switch

Circuit diagram for new switch

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Niloch25/10/2010 10:05:05
371 forum posts
I have a bench mounted  Alpine pillar drill bought from Graham Engineering who have ceased trading but did so  out of West Bromwich many years ago.
 
The On/Off switches have become unreliable.  I have bought a Warco N.V.R. switch (Item No. 301505) which is described as with lock on emergency stop button.
 
I'm sure members would agree with me that experimenting to try and arrive at the correct wiring is not to be recommended with 220/240 volts.  Please can someone give me the correct wiring procedure.  Thank you.

Edited By Niloch on 25/10/2010 10:05:44

john swift 125/10/2010 10:49:47
avatar
318 forum posts
183 photos
Hi Niloch
 
I've not seen that exact type of switch
but If you look at my pictures for sam's motor control it may give you an idea
 
if you can post a few  pictures of what you have
i'll try and help you  
 
 
 John
Jim Whetren25/10/2010 11:27:00
50 forum posts
1 photos
Hello Niloch,
 
I have fitted one of these switches to my ancient Startrite dril which has a single phase motor connected to a 13A plug with three core cable.
 
The important thing to remember is that the line (live) feed from the plug goes through the emergency stop relay, so the power is cut off at source when you hit the red button.
 
I have opened up my switch an taken a picture which I will try to add here.
 
Regards
Jim

Niloch25/10/2010 17:07:41
371 forum posts
John, thank you for your input.  I was procrastinating not only about taking a photo. but attempting to upload it here, however, Jim has come to my rescue. Thank you very much indeed Jim.
Billy Mills25/10/2010 23:22:11
377 forum posts
A common China type NVR fitted to many machines has two push on connectors for mains in and two identical connectors for mains out. If the connections are reversed then the coil will be on all the time and will burn out. A buzz from the NVR when off is a good clue!
 
For this type, the coil is wired to the output terminals so you can check in and out by measuring the resistance between the terminals. Had a brand new belt sander from a well knowen supplier that had this problem.
Regards,
Alan.

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