Help with Motor Connection

[roydm]

A colleague has asked me to help figure out the wiring of a 2 speed single phase motor
I spent a couple of hours searching the web but unable to find any information on the wiring,
It's a GE model 5KCP19 SG400
208 - 220 Volt 50 / 60 Hz XGU
2 / 6 pole 3.8 / 2.4 Amps
Time rating INTMT Class B
With the motor he has a pair of capacitors 25 and 15 mfd

He tried running it using a capacitor red to blue and 220 between red and yellow but says it overheated after 2 minutes.

if you can help Iwould be most grateful

Thanks
Roy

 

[jraef]

There are (as you probably found out), standard NEMA wiring diagrams available all over the web for single phase motors, and for single phase dual votlage motors. But none for single phase two speed motors that I could find.

GE got out of the motor business some time ago, their motor product line was bought by Regal Beloit. I bet that if you dig up a valid current part number for a Regal Beloit 2 speed single voltage 1 phase motor and ask Regal Beloit for a wiring diagram, it will be the same connection diagram as the GE branded version. Companies rarely change everything when they buy a company or product line, they just change the logo on the nameplate.

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[roydm]

Thanks a lot Jraef, I would never have known about the brand switch.
Regards

Roy

 

[MiketheEngineer]

How many ways can you hook up three wires - course you coudl burn somehting out!! But I am brave with YOUR motor!!

 

[roydm]

Fine Mike, but I have 7 wires and 2 capacitors, 2 of the wires dissapear into a black box.
It's one thing to figure out the connections if you have it in your hand
Quite another to deal third hand with a motor I have never seen

 

[dArsonval]

Roy;

Single phase electric motor connections remain among the most difficult to troubleshoot among lay people, and professional repair-people alike.
The color of a wire is meaningless unless it applies directly to the product declaring what the color indicates.
Your General Electric 5KCP19... number likely denotes a Permanent Split "Run Capacitor" motor that's 5-5/8" in diameter.
And, a very special one at that, with two separate run capacitors.

Because the GE number cannot be found in an on-line search also likely means it was manufactured "Proprietary" for some Heating and Cooling equipment manufacturer.
Your diagram does not indicate any known resistance between the white leads and other colored leads. "White" on a PSC Motor is typically "common", but not always.
If the motor was connected and powered up long enough to overheat the Class B insulation, it has probably melted the winding a tad,
and the serviceability of the device has been diminished.

An equivalent motor could possibly be closely matched up at an "older" over-the-counter supplier.

This post may enter the borderline of Professional Engineers vs. The Lay Person Public.
It also authenticates that the Internet has a long way to go with being able to provide the useful information we're all seeking.
The diagram for this motor or an equivalent there of... is surely hiding in a printed document somewhere.
Whether it's in an out-of-date General Electric Catalog, or a manufacturer's repair manual, who knows.

Always enjoying the forum,

John

 

[rhatcher]

roydm,
Since there is no speed switch, it does seem reasonable to believe that the motor is a split phase capacitor run motor as suggested by dArsonval. This is a guess but, it would seem more plausible to connect the motor as follows:
1st speed
L1: red
L2: blue
Cap: blue - yellow (or red - yellow)

2nd speed
L1: black
L2: orange
Cap: black - yellow (or orange - yellow)

I would also guess that you would use the larger capacitor with the winding having the larger resistance and that this winding is the low speed winding (larger resistance = more poles?).

The "little black box" is more of a mystery. What is the resistance between the two white wires? Could this be a thermal protector?

 

[MiketheEngineer]

Oh - crap!!