MEM Electrics

[Brian HParticipant @brianh50089]

Wouldn't you just know it, the company that is 3 miles away is on holiday for at least a couple of weeks!

The Axminster switch has just arrived and looks good. I'm going to fit it so that I can get on and will team it with one of the Screwfix overloads as suggested by Les.

I will only use the Axminster switch to turn on the electrics because the rotary switch turns the lathe on and off so maybe it'll last a bit longer.

If (when) it burns out then the local company should be back from holiday.

As before, very grateful to all the help.

Brian

[Les Jones 1Participant @lesjones1]

Hi Brian,
The starter thet Michael Pool suggested from Toolstation works out cheaper than the one on Ebay. The starter is £20.20 and the thermal overload is £9.90 (Total £30.10) You should find aToolstation faily close to you. You could just use the emergency stop button on the unit from Axminster. (You could even use the NVR part of it for the coolant pump.

Les.

[Brian HParticipant @brianh50089]

Thanks for your continuing help Les. Am I correct in thinking that these thermal overload relays are OK for single phase? only none of the descriptions give any information.

Brian

[Les Jones 1Participant @lesjones1]

Hi Brian,
Yes allthough they are made for three phase they can be used on single phase. I will explain how they work first. Each of the three themal overloads consists of a small heating element connected in series with the load. This is wrapped around a bi metal strip. The heating effect causes the bi metal to bend. The more current passes through the heating element the more the bi metal bends. If one or more bimetal strips bend they bear against a bar it causes a normally closed contact to open. This contact is in series with the contactor coil so the contactor drops out. For single phase use you normally use two of the three. (One for live and one for neutral.) You may find some wiring diagrams suggesting putting the third overload is series with the one that has already been used for the live. I don't think this is necessary. Don't forget to get the themal overload with the correct current adjustment range for your motor. You can check online that your local Toolstation has the items in stock before traveling.

Les.

[Brian HParticipant @brianh50089]

Decided to cut my losses and go for a self contained item such as has been discussed earlier. I just want to get on with my Burrell!

Thanks to all (especially Les and Emgee) for help.

Brian

Edited By Brian Hutchings on 11/12/2016 15:43:14

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