Hi guys.
Just been to look at a job on the starter to a large compressor.
It "wouldn`t start"!! Likely to be the starter then! :B
So went and freed the stuck contactor, and off it goes. HOWEVER.......
We`ve got 6 motor wires - all red - unmarked. 3 of them are not connected to the contactor - appears to have a contactor pole fault (delta).
The "start" button doesn`t -switch the local isolator on, contactor 1 fires, then 2 & 3 after a short delay.
I understand the process involved, and the general wiring proceedure. My question is:
If they want to to repair/replace the starter (which they do),
1...Who makes the best/most cost effective solution?
2... The three motor wires which are disconnected. How can I determine which is which? Or, if my thinking is correct, does it matter, as, from rusty knowledge, they all get shorted together when the delta contactor fires.
DOL box contains: 3 3ph contactors. 1 electronic time delay. 6 motor winding wires (u,v,w,u2,v2,w2 I think???) 4 control wires from compressor. 3 phases supplied (no neutral).
Strangely, I didn`t see an overload in there. However there is a small "radial lead" component - varistor or something maybe? Think it may be to do with the time delay. It`s connected between motor contactor L3, and star contactor L1 (at least, that`s where, from memory, i THINK it was!)
Cheers guys. The 3 ph side of it isn`t a problem; I`ve never had dealings with an auto-changeover before. Plus these un-connected motor wires are spooking me a little, in case I`m wrong about the correct connections.
KME
Just been to look at a job on the starter to a large compressor.
It "wouldn`t start"!! Likely to be the starter then! :B
So went and freed the stuck contactor, and off it goes. HOWEVER.......
We`ve got 6 motor wires - all red - unmarked. 3 of them are not connected to the contactor - appears to have a contactor pole fault (delta).
The "start" button doesn`t -switch the local isolator on, contactor 1 fires, then 2 & 3 after a short delay.
I understand the process involved, and the general wiring proceedure. My question is:
If they want to to repair/replace the starter (which they do),
1...Who makes the best/most cost effective solution?
2... The three motor wires which are disconnected. How can I determine which is which? Or, if my thinking is correct, does it matter, as, from rusty knowledge, they all get shorted together when the delta contactor fires.
DOL box contains: 3 3ph contactors. 1 electronic time delay. 6 motor winding wires (u,v,w,u2,v2,w2 I think???) 4 control wires from compressor. 3 phases supplied (no neutral).
Strangely, I didn`t see an overload in there. However there is a small "radial lead" component - varistor or something maybe? Think it may be to do with the time delay. It`s connected between motor contactor L3, and star contactor L1 (at least, that`s where, from memory, i THINK it was!)
Cheers guys. The 3 ph side of it isn`t a problem; I`ve never had dealings with an auto-changeover before. Plus these un-connected motor wires are spooking me a little, in case I`m wrong about the correct connections.
KME