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TESTING SUBMERSIBLE PUMP
MOTORS |
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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 Franklin Electric manual the main winding should have a reading of between 3.0 and 3.6 ohms between the yellow and black wires. The start windings are the reading between the yellow and red wires. The range should be between 10.7 and 13.1 ohms. Check the Single Phase Motor Specs page from the Franklin Electric manual for details about other motors.
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