TESTING SUBMERSIBLE PUMP MOTORS
Presented by:
DEAN BENNETT SUPPLY
Ph 800-621-4291


     The first thing you need to check when you are having problems with your submersible water well pump, is the motor condition.

     We will need to use an ohm meter to test resistance in the windings. The first test we will do is whether the motor is grounded.

     Set your ohm meter to Rx100k or the highest reading available to you. Place the leads together and zero the meter reading. The wires from your pump control box going to the well, should be disconnected. You will have a Red, Yellow, Black, and a Green ground wire.

     Connect one of your meter leads to the green ground wire. Using the other meter lead, connect to each of the other 3 wires, one at a time, looking for any reading. If you get any reading, you have a ground in the windings of the motor. If you do this test and no reading appears, you do not have a ground condition to correct.

     Testing the windings of your motor will tell us if the motor has a problem in the main or start windings. Set your meter to Rx1 and zero out the reading on the meter. For this test, we will assume you have a 3/4 hp 230V single phase 3 wire with ground submersible motor in the well.

According to the manual the MAIN winding should have a reading of between 3.0 and 3.6 ohms between the YELLOW and BLACK wires, which are the main winding readings.

The START windings are the reading between the YELLOW and RED wires. The range should be between 10.7 and 13.1 ohms.

Check below for the Single Phase Motor Specs details about other motors.

 

4 Inch Submersible Pumps

 

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Single Phase Submersible Pump Motor Specifications
HP Voltage 2 or 3 Wire
Plus Ground
Main Winding
Yellow & Black
Resistance in Ohms
Start Winding
Yellow & Red
Resistance in Ohms
F&W Part #
4" 2 Wire + Ground Submersible Pump Motors
(No Control Box Needed since controls are in the motor)
1/2 HP 115V 2 Wire 1.0 - 1.3 Ohms 137412
1/2 HP 230V 2 Wire 4.2 - 5.2 Ohms 137414
3/4 HP 230V 2 Wire 3.0 - 3.6 Ohms 137416

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AND GET A 2ND #137416 MOTOR FREE
Limited to current stock on hand - stock reduction special.

1 HP 230V 2 Wire 2.2 - 2.7 Ohms 137418
4" 3 Wire + Ground Submersible Pump Motors
(Must Use Control Box to run these 3 wire motors)
1/2 HP 115V 3 Wire 1.0 - 1.3 Ohms 4.1 - 5.1 Ohms 137426
1/2 HP 230V 3 Wire 4.2 - 5.2 Ohms 16.7 - 20.5 Ohms 137428
3/4 HP 230V 3 Wire 3.0 - 3.6 Ohms 10.7 - 13.1 Ohms 137430
1 HP 230V 3 Wire 2.2 - 2.7 Ohms 9.9 - 12.1 Ohms 137432
1-1/2 HP 230V 3 Wire 1.7 - 2.2 Ohms 8.0 - 9.7 Ohms 137434
2 HP 230V 3 Wire 1.8 - 2.3 Ohms 5.8 - 7.2 Ohms 137435
3 HP 230V 3 Wire 1.0 - 1.5 Ohms 4.0 - 4.9 Ohms 139422
5 HP 230V 3 Wire .68 - 1.0 Ohms 1.8 - 2.2 Ohms 137456
6" 3 Wire + Ground Single Phase Submersible Pump Motors
5 HP 230V 3 Wire .55 - .68 Ohms 1.3 - 1.6 Ohms 126551
7-1/2 HP 230V 3 Wire .36 - .50 Ohms .88 - 1.1 Ohms 126553
10 HP 230V 3 Wire .27 - .33 Ohms .80 - .99 Ohms 134134
15 HP 230V 3 Wire .17 - .22 Ohms .68 - .93 Ohms 136361

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Testing your Submersible Pump Control Box