brook gryphon single phase wiring help

[ianjenn]

Hi Guys
I have a Brook Gryphon P14 single phase cap run/cap start motor which is used on a lathe I have recently purchased. Unfortunately the previous owner dismantled the motor leaving me the task of reconnecting. I have identified the fault on the motor which was a faulty switch that has now been replaced and would like to reassemble. Is there any way you could fill in the gaps from the description below

The starter winding and running winding have there original labels of A1, A2 and Z2, Z3. So that leaves me with two capacitors and the switch. There is a wire coming from the winding into the starter capacitor and I presume the other side of the starter capacitor connects to the switch and then to Z1. I am unsure as to which terminals the running capacitor connects to or if any of the terminals need connecting together.

The terminal block has five connections as follows
A2 Z3 Z1
Z2 A1

I believe terminal A2 takes neutral, and A1 live for one rotation and Z2 neutral and Z1 live for reversed rotation.

Any help would be greatly appreciated
best wishes
alex

[Al_The_Man]

Normally a motor like this would be connected by the run capacitor permanently connected from live to one end of the start winding, this start winding end would also be on the switched side of the start switch.
The other end of the start winding goes to neutral.
The start capacitor would be in series with the other side of the start switch, and the other cap. terminal fed from the live terminal.
The run winding would be across live and neutral.
Reverse the start winding ends or run winding ends to reverse direction.
The difference in the caps are the run cap is usually smaller value and is motor-run grade, the start can be non-polarized electrolytic and higher value.
Al.

[ianjenn]

Thanks Al
So does that mean the run cap needs connecting between Z3 and A1

[Al_The_Man]

I will post the hook up when I get back in later today.
I assume you have identified the start & run windings?
A1-A2 start & Z2-Z3 Run?
Al.

[ianjenn]

I may be wrong as I am a complete duffer, but I had identified the windings as Z2-Z3 start and A1-A2 run owing to the fact that there is three Z wires, Z2-Z3 going to the terminal block and Z1 going to the starter cap.

following from your previous very helpful note I thoghut the wiring would look like this http://precisionlight.0catch.com/wiringmotor.JPG

[ianjenn]

I had identified the starting winding as Z2-Z3 as this winding has the extra wire going to the start cap. this is how I was going to wire at after you first very helpful post.
http://precisionlight.0catch.com/wiringmotor.JPG

[Al_The_Man]

I could not log into those sites, it said I had to be a registered user?
Here is a diagram that should apply.
You have to identify which is which out of the windings.
Al.

[ianjenn]

Thanks for your help Al, would it be possible for you to cast your eyes over this image to make sure I have translated your drawing into the correct connections on the terminal block.

[Al_The_Man]

I assume you have a reversing switch somewhere on the lathe?
If you look at the drawing I show, and remove the run windings to another pair of terminals, leave all the start windings and caps as they are.
All you would need to do is to reverse the live and neutral to either the start pair or the run pair.
The other pair could remain as they are.
Al.

[ianjenn]

Hi Al,
I am well and truly stumped these are the connections that I have to play with (top image) and I have a 5 pin terminal board. If I wire up how I think it was wired up previously (bottom image) the Z2 and A2 connections both don't get a neutral connection. I could connect A1,Z3 to live and the run cap between this and Z1. then to connect A2,Z2 to neutral. But this would only use 3 of the five pins and not allow for reverse rotation. Have you any thoughts as to how this can be resolved. I am sure it is simple but my brain is starting to explode now

[Al_The_Man]

Do you have the configuration of the reversing switch? and do you have 4 wires from reversing switch to motor?
Al.

[ianjenn]

penny drops!!! thanks Al. It is the switch that changes the circuit!!! not my dodgy wiring. I imagine the lathe was previously 3 phase so i probably can't use the switch anyway. I think I will just forget about reverse.