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3 phase motor wiring

TECA B3-80-IE3 1.5kw motor

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Rockingdodge03/11/2022 15:49:44
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396 forum posts
111 photos

teca b3-80-ie3.jpg

I'm currently wiring this motor to a vfd and my query is there are 2 thin blue wires ending in a small connector as below, in the top left hand corner, are these for temperature sensing? otherwise what are they?

teca wiring.jpg

Thanks

Roger

SillyOldDuffer03/11/2022 16:15:11
10668 forum posts
2415 photos

I'd bet money the wires go to a thermistor - an optional temperature sensor. Worth connecting if the motor is going to be run flat out most of the time, I've never got the 1.5kW motor on lathe more than luke-warm. It is fitted with a permanently 'on' fan though, and I rarely do long sessions of heavy cutting.

Dave

Rockingdodge03/11/2022 16:18:57
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396 forum posts
111 photos

I'm using it on a 72" x 2" belt sander, I doubt it'll be running more than 10 to 15 mins max at a time.

Roger

David Jupp03/11/2022 16:31:02
978 forum posts
26 photos

Could be for a temperature sensitive switch, or a thermistor as Dave suggests. Either can be used to indicate when the windings get hot.

Checking the resistance should determine which it is, if zero ohms it's a switch.

AJAX03/11/2022 17:31:29
433 forum posts
42 photos

I have a Tech / Techtop motor with similar wires (which I didn't use). I'm reasonably confident the user manual stated they were thermistor connections. A well known supplier of Techtop motors lists "Protective thermistors type PTC (1 per phase)" as a feature. I hope that helps.

Hairy Pete03/11/2022 17:36:45
17 forum posts
3 photos

It will be a thermistor - see page 14 of their catalogue.

https://tecmotors.co.uk/wp-content/uploads/2019/04/teccat.pdf

Robert Atkinson 203/11/2022 18:21:56
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1891 forum posts
37 photos

Is that "earth" connection actually connected to the frame of the motor? It looks like it goes to the terminal box housing which looks like it's plastic! In particular there is damage to the edge where the cover fits and it looks like gray plastic not diecast alloy.

It's worth checking with a meter. Good to see you are using SY cable and proper ring tags yes

Robert G8RPI.

Edited By Robert Atkinson 2 on 03/11/2022 18:22:35

Rockingdodge03/11/2022 18:27:18
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396 forum posts
111 photos
Posted by Robert Atkinson 2 on 03/11/2022 18:21:56:

Is that "earth" connection actually connected to the frame of the motor? It looks like it goes to the terminal box housing which looks like it's plastic! In particular there is damage to the edge where the cover fits and it looks like gray plastic not diecast alloy.

It's worth checking with a meter. Good to see you are using SY cable and proper ring tags yes

Robert G8RPI.

Edited By Robert Atkinson 2 on 03/11/2022 18:22:35

No it's a cast box with full continuity to the motor and also into the sander its bolted to.

DC31k03/11/2022 18:43:36
1186 forum posts
11 photos
Posted by Rockingdodge on 03/11/2022 18:27:18:
No it's a cast box with full continuity to the motor and also into the sander its bolted to.

Note the international symbol for protective earth cast into the part to the right hand side on the photo. It is somewhat unlikely that would be moulded into a plastic part.

Robert Atkinson 204/11/2022 08:56:36
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1891 forum posts
37 photos

Looking more closely there is paint removed under two of the screws holding the frame down.. The damage to the sealing edge must have been before they painted it. There are different views on using screws to provide a primary earth path. A lot of standards won't accept using the shank of the screw, it has to be a metal to metal contact or a earth wire / strap.

Robert G8RPI

Rockingdodge04/11/2022 11:31:45
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396 forum posts
111 photos
Posted by Robert Atkinson 2 on 04/11/2022 08:56:36:

Looking more closely there is paint removed under two of the screws holding the frame down.. The damage to the sealing edge must have been before they painted it. There are different views on using screws to provide a primary earth path. A lot of standards won't accept using the shank of the screw, it has to be a metal to metal contact or a earth wire / strap.

Robert G8RPI

This is in my hobby workshop Robert, here's a couple of photos of a resistance test between the vfd earth and a fixing bolt and the sander table.

vfd earth to motor bolt.jpg

vfd earth to motor fixing bolt.

earth vfd to sander table.jpg

vfd earth to sander table.

The whole belt sander will be bolted through a steel base which is earth bonded to an earth running round the workshop and back to the mains.

Roger

Lindsay Donaldson04/11/2022 13:45:11
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8 forum posts
Posted by Rockingdodge on 03/11/2022 16:18:57:

I'm using it on a 72" x 2" belt sander, I doubt it'll be running more than 10 to 15 mins max at a time.

Roger

Is it the Jer Schmidt design?

Rockingdodge04/11/2022 14:29:42
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396 forum posts
111 photos
Posted by Lindsay Donaldson on 04/11/2022 13:45:11:
Posted by Rockingdodge on 03/11/2022 16:18:57:

I'm using it on a 72" x 2" belt sander, I doubt it'll be running more than 10 to 15 mins max at a time.

Roger

Is it the Jer Schmidt design?

It's based on the Made By Dad design Lindsay. It is really solid but I had to play with the dimensions a bit to get the belt to fit.

Lindsay Donaldson04/11/2022 15:37:31
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8 forum posts
Posted by Rockingdodge on 04/11/2022 14:29:42:
Posted by Lindsay Donaldson on 04/11/2022 13:45:11:
Posted by Rockingdodge on 03/11/2022 16:18:57:

I'm using it on a 72" x 2" belt sander, I doubt it'll be running more than 10 to 15 mins max at a time.

Roger

Is it the Jer Schmidt design?

It's based on the Made By Dad design Lindsay. It is really solid but I had to play with the dimensions a bit to get the belt to fit.

I had a quick look - it's very similar to the JS one I made. I guess they all are to some degree. I'm in the lucky position of having made one for a friend my 'payment' was a pile of materials to make myself one so I have the opportunity to apply 'lessons learned' second time round.

Rockingdodge04/11/2022 15:58:59
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396 forum posts
111 photos
I had a quick look - it's very similar to the JS one I made. I guess they all are to some degree. I'm in the lucky position of having made one for a friend my 'payment' was a pile of materials to make myself one so I have the opportunity to apply 'lessons learned' second time round.

Nice one, always good when a plan comes together wink

Mine was more than paid for when my mini mill sold for asking price. devillaugh

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