Newlec starter switch wiring

[Tony Hillyard]

Good Afternoon All,

I have just bought second had elderly lathe off eBay.co.uk. It is fitted with a single phase motor and all works OK except the red "off" button on the Newlec starter switch does not function. I would like to rectify this. It is wired up with the live feed into T1 connection. I am wondering if the previous owner wired it up wrong.

Can anybody supply a wiring diagram please?

I will try and upload a picture of the inside of the switch.

Thanks in advance.

 

[Pete999]

The red button you talk of, is this button on the lid of the starter?

 

[Tony Hillyard]

The red button you talk of, is this button on the lid of the starter?

Yes it is Pete. Please the bottom left hand corner of the cover.

 

[davesparks]

Well the purple wire looks mighty suspicious

 

[Pete999]

Yes it is Pete. Please the bottom left hand corner of the cover.

View attachment 34861

Can you post a picture of the reverse side of the lid, showing the way the buttons are situated on the inside of the lid?

 

[Darkwood]

Its hard to make out but the wiring seems wrong to me, where does the wires that enter 95 and 96 come from?

 

[Tony Hillyard]

Can you post a picture of the reverse side of the lid, showing the way the buttons are situated on the inside of the lid?

Please picture of inside of lid plus label on the side.

 

[telectrix]

for what they cost.......

DOL Starters (Single Phase) (Page 1 of 1) - https://inverterdrive.com/group/DOL-Starters-Single-Phase/

 

[telectrix]

it's just possible that the lathe originally had a 3 phase motor and someone has replaced with a single phase unit, making a cock-up of modifying the starter. the label seems to indicate 400V for the control circuit.

 

[Tony Hillyard]

Its hard to make out but the wiring seems wrong to me, where does the wires that enter 95 and 96 come from?

95 comes from L2 and 96 comes from L1

 

[Tony Hillyard]

it's just possible that the lathe originally had a 3 phase motor and someone has replaced with a single phase unit, making a cock-up of modifying the starter. the label seems to indicate 400V for the control circuit.

That is highly possible. It's why I wanted to double check and do the job right.

 

[Darkwood]

If as mentioned the contactor coil is 400v then you cannot correct what is a mess up of the wiring, if however the coil is 230/240v ac then its just a matter of altering the wiring, be very careful here, the purple wire is taken of the live side of the isolating switch and can be dangerous if you are unsure of what you are doing here, ensure you have disconnected the whole unit further upstream and not just by the rotary switch on the front.

So to recap -
-The wiring is totally wrong, the overload won't cut the power if it operated and explains why the stop doesn't work.
-The coil on the contactor is possibly the wrong rating
-The wiring poses a hazard if not isolated properly upstream of the unit

 

[Tony Hillyard]

If as mentioned the contactor coil is 400v then you cannot correct what is a mess up of the wiring, if however the coil is 230/240v ac then its just a matter of altering the wiring, be very careful here, the purple wire is taken of the live side of the isolating switch and can be dangerous if you are unsure of what you are doing here, ensure you have disconnected the whole unit further upstream and not just by the rotary switch on the front.

So to recap -
-The wiring is totally wrong, the overload won't cut the power if it operated and explains why the stop doesn't work.
-The coil on the contactor is possibly the wrong rating
-The wiring poses a hazard if not isolated properly upstream of the unit

Very many thanks Darkwood. I think Telectrix said it all, for the cost, buy a new unit and bin the old one. It's not worth the risk.

Thank you all for your advice, it's very much appreciated.

 

[Sintra]

Mate I wouldn't buy a new unit if the coil is 230V - 240V which I suspect it is as I'm pretty sure I've used that model on single phase before. If the coil has the correct voltage then all you need to do is connect it up correctly and it should work. As darkwood says isolate upstream due to that silly purple cable.

 

[telectrix]

5his is for a 3 phase starter, but can be used on single phase using 2 of the poles for L and N.

ignore the remote stops in above. the yellow wire would go to N if you have a 240V coil.