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Electric Motors/Delco Motor Wiring


Motor (800x600).jpg
Motor (800x600).jpg  
QUESTION: I have the following motor:
Delco Rodframe, model M440A1
1/4 HP, Type SP, 110V, 60 Cycles, RPM 1725, 4.0 Amps
Made in Canada by McKinnon Industries, Ltd.

Please refer to the attached photo; I labelled and disconnected all wires and found the following resistances:

Wire on #2 terminal had about 29 ohms to the light colored wire on #1 terminal. Wire on #4 terminal had about 2 ohms to the dark colored wire on #1 terminal. No other continuities were found but these resistances seemed to vary as if some capacitor was charging and discharging.

The motor came on a jointer but was disconnected. I would like to know where to attach NEUTRAL, HOT and GROUND. Thank you.

ANSWER: Seems like term 1 is common
110V olt motor?

N to 31

L2 to #2 & 4

if not split the wires on #1 and then measure the resistance .
with 4 wires should have 2 circuits.

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QUESTION: I'm sorry, but I don't understand the answer.
The motor is a 110V motor.
You said N to 31, but there is no 31 (see photo).
You said L2 to #2 &4, but is L2 not NEUTRAL?
Where should the HOT (L1) be connected?
I do have two circuits as stated in my 2nd paragraph.

l1 or L2 can be HOT. N is neutral I wanted to hit the number sign but didnt hit the shift key so it went to 31
should be #1

Try connecting Neutral to #1 which I think is common.

Then L1 (HOT) goes to 2 and 4.

The 2 circuits should be a run winding and start winding.
The start winding has a higher resistance lets say 29 ohms.
The run winding will be approx. 20 or less ohms.

You measured 2 ohms which seems like the the circuit through the start switch inside the motor.

Thats why I asked you to open the common point and see if there 2 circuits other than the 2 ohm one.

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Harcharan Singh Diocee


Electric motor winding redesign, AC and DC. Troubleshooting, motors controls generators. Vibration analysis, dynamic balancing, root cause analysis: electrical and mechanical.


thirty five years electro-mechanical and Senior Management


Journeyman Motor Rewinder, Millwright, Industrial Electrician, Vibration Analyst level II. Certified Electrical Technician ASTTBC, FSR Class B, in BC. Laser alignment specialist. Marine machinery repairs. Business Management Certificate. Last 19 yrs as Plant Manager

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