Newlec starter switch wiring

[Tony Hillyard]

What size motor is the starter protecting? looks like the purple wire is a short to remove the overload contacts from the circuit. Possibly the overload was set too weak or it has failed. The coil voltage is usually written on the coil of this unit.
IE The motor has overloaded and the overload would not reset or it was set too low causing constant overloading. Therefore somebody "fixed it" in a dangerous way by adding the purple link.
Please check the motor size to see what the full load amps are or post a photo of the plate.

ps did you notice the nipped cable?

View attachment 34879

I have had a good look at the motor but there is no plate or information on it. I was told it had been rewound recently to single phase (at vast expense). The motor is big! 25cm across!

I have installed another starter switch, I had in stock. A normal single phase unit, the same as on my single phase four post car lift. But the lathe will not run using that switch. So I don't know.

 

[Barry White]

Can you link me to the lathe on ebay or if its not there now give me the lathe details. There may be a plate on the lathe?

Are you running this on a 13A plug top?

 

[Tony Hillyard]

Can you link me to the lathe on ebay or if its not there now give me the lathe details. There may be a plate on the lathe?

Are you running this on a 13A plug top?

In France we do not have fused plugs, just individual circuits for each socket. This circuit is fixed at 16 amps and does not seemed bothered by the load. The lathe is a 1940 Colchester Master. I will take some photos a bit later this evening.

 

[Tony Hillyard]

In France we do not have fused plugs, just individual circuits for each socket. This circuit is fixed at 16 amps and does not seemed bothered by the load. The lathe is a 1940 Colchester Master. I will take some photos a bit later this evening.

mykey: photos as promised. When advertised on eBay she did look rough. I have since serviced it, given it a coat of paint and plenty of oil in the right places. It's just that starter switch that I would like to get right.

 

[Darkwood]

Whithout a motor plate you are kinda buggered tbh, as its been rewound it may be a idea to try trace the company that did it and see if they can tell you its rating etc, if you cannot trace this then see if the motor has a thermal trip or thermistor in it and ensure you use this as a backup protection .. if we were to assume the old overload was rated for the motor when it was a 3ph then it may have been a 2.2kw or a 3kw judging by the range on it, if this was rewind to a single phase then we could expect it to be rated the same but the current will be approx x3 so we would be looking at a 6.5 - 9amp FLC rating ... running the machine and clamping it in its heaviest gear will give an idea where abouts we sit with the actual rating of the motor but again I stress we are making a guess based on a presumption. Your motor is required to be protected from overload so you need to achieve this somehow with protection design for motors.

You could always look up the original lathe 3ph motor rating and work it from there.

 

[Tony Hillyard]

Whithout a motor plate you are kinda buggered tbh, as its been rewound it may be a idea to try trace the company that did it and see if they can tell you its rating etc, if you cannot trace this then see if the motor has a thermal trip or thermistor in it and ensure you use this as a backup protection .. if we were to assume the old overload was rated for the motor when it was a 3ph then it may have been a 2.2kw or a 3kw judging by the range on it, if this was rewind to a single phase then we could expect it to be rated the same but the current will be approx x3 so we would be looking at a 6.5 - 9amp FLC rating ... running the machine and clamping it in its heaviest gear will give an idea where abouts we sit with the actual rating of the motor but again I stress we are making a guess based on a presumption. Your motor is required to be protected from overload so you need to achieve this somehow with protection design for motors.

You could always look up the original lathe 3ph motor rating and work it from there.

I tracked down a users handbook for this model and it states " The standard motor is 1. 1/2 H.P. 2-phase or 3-phase, but D.C. and Single phase motors are fitted to order at extra cost..."

I am wondering if it might be better to start from scratch, buy a 1. 1/2 H.P. single phase motor and fit a new matching starter switch.

 

[Darkwood]

I would if I was in your shoes have a chat with Colchester lathes group, the irony here is I live a few miles from the company, they may be able to advise you better knowing the requirements of the machine and may already have a solution for you.

I would point out though a lathe of this age will not meet any modern requirements for safety so be aware of that when using it.

Colchester Centre lathes - Colchester - http://www.colchester.co.uk/products/colchester-centre-lathes/

 

[Lagentium]

The coil must be the correct voltage due to it working, the problem appears to be in the stopping side of it!!

 

[Lagentium]

Put up a better picture of the contractor and overload assembly me old mucker

 

[Tony Hillyard]

The coil must be the correct voltage due to it working, the problem appears to be in the stopping side of it!!

As is evident from my posts Lagentium, I am no expert, but that is what baffles me. The stopping side not working.

Darkwood, I will certainly contact Colchester lathes group. It was they that supplied me with the users manual. Nice people to deal with.