N.V.R. switch

[NilochParticipant @niloch]

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

[NilochParticipant @niloch]

Circuit diagram for new switch

[john swift 1Participant @johnswift1]

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 WhetrenParticipant @jimwhetren72358]

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

[NilochParticipant @niloch]

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 MillsParticipant @billymills]

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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