# Wiring for a westinghouse electrical motor?

I've got an electric split-phase motor (no capacitor) with a centrifugal switch.

### Specs

Westinghouse electric motor manufactured in 76.
RPM 1725/1140
1/2 HP
115V 60Hz
Thermally protected L Type

It seems to me that the terminals are bypassed as the power cord is directly connected to the motor.

When plugging the motor I hear a humming sound and I have to hand turn the shaft to make it rotate (any direction).

That tells me that there is a problem with the start winding. So, I checked the centrifugal switch, cleaned it with sandpaper and still no automatic starting of the motor.

Here's the schematic of the motor as I see it since there is no schematic printed on the chassis.

simulate this circuit – Schematic created using CircuitLab

There are 2 terminals for plugging a kind of molex connector.

I don't know how to proceed from here.

Should I make connectors to connect wires between them?

Note than SW2 have a side not connected to anything!

Here's a table of all the motor interconnections between them with their resistance:

+--------+--------+--------+----------+--------+--------+
|        | Green  | Yellow |   Red    | Orange | Black  |
+--------+--------+--------+----------+--------+--------+
|  Blue  |    -   |    -   |     -    |    -   |    -   |
+--------+--------+--------+----------+--------+--------+
|  Green |        |   2.4  |    4.3   |    0   |    -   |
+--------+--------+--------+----------+--------+--------+
| Yellow |        |        |    5.6   |   2.4  |    -   |
+--------+--------+--------+----------+--------+--------+
|   Red  |        |        |          |   4.0  |    -   |
+--------+--------+--------+----------+--------+--------+
| Orange |        |        |          |        |    -   |
+--------+--------+--------+----------+--------+--------+


A - indicates infinite resistance, i.e no short circuit

Also, testing each motor input against the motor casing gives an infinite resistance.

The previous schematic shows the actual condition I got the motor and it used a bypass with a power cord.

I see that terminal A3 have a cut green wire so I guess that would be the same green wire from the motor connected with the line BLACK input.

Also, for terminal B1 the cut wire is yellow so this would be the same yellow from the motor and this would be connected with the line WHITE input.

The next schematic shows what it would have been before the "hack".

simulate this circuit

• Add the windings to the schematic, and mention at least their DC resistances. I think it's likely the start winding will be connected via the centrifugal switch to an external start capacitor. Jan 21 '17 at 15:52
• About the windings, I am not sure which wires go to each of them... Jan 21 '17 at 15:57
• You have the motor. We don't. Do you have a multimeter? Jan 21 '17 at 16:03
• Yes I have a multimeter. Since the green and yellow wires are connected to the power line I'm assuming that is the RUN winding. On that winding I get 2.4 ohms. For the start winding I'm assuming it would be the blue and red wires and I get no reading (infinite resistance, not connected). Jan 21 '17 at 16:07
• According to your measurements the Start winding is open circuit. That would prevent your motor starting without a physical turn. I wonder if that's why you were given it? Jan 21 '17 at 17:52