Help please

[Karl Card]

I have a Baldor L3907T single phase, 7.5 hp motor. While replacing or trying to replace caps some of the wires came off.
I have a run cap and 2 start caps. I have 3 white wires coming out of motor to caps.
I do not know how to read electrical blueprints or diagrams.
My understanding is that the start caps do not have a negative or positive, my understanding of the run cap is that the wires coming
from motor have to go on 1 pole, but should any of the 3 wires go to the start caps? I realize
no one can tell me what wire is what because they are all white with no markings.
Any help appreciated.

 

[RPH]

Pics would help.

 

[wyliesdiesels]

 

[mm08822]

This is the closest baldor motor I can find. Use the diagram along with a digital meter to check which of the 3 wires is which. You will need to open the cent switch momentarily while checking otherwise you will not be able to fully identify each wire uniquely.

Notes indicate that multiple caps may be wired in parallel and shown as only one.

 

[dogdog]

yea three wires would be one for power to the caps, Start cap(s) to the centrifugal switch, Run caps directly to the Run/start Coil...

The power wire should be easy to identify.
so you are left with 2 wires and trying to see how the start caps are arrange if it they are connected in parallel or in series.
The run cap should just be one capacitor and smaller in value ( usually )

opening it up would be the easiest , the wire connecting to a centrifugal switch would be for the start cap, the wire connecting directly after the switch or to the coil would be for the run cap.

Now the only thing you have left is to figure out what and how those two start caps are configured. in series or in parallel.

There is/was another thread about a 7.5HP compressor motor.. but it is a different brand.

 

[hobie18]

Had to look up what these are used for, and how many amps they draw. That is a lot of power.

 

[BigGarage]

He'll be making his 2nd post anytime now.