How To Repair The Windings In A Sump Pump
Whether it exist a submersible pump yous already own or a used pump you are looking to buy, information technology is of import to know the condition of the electric motor. A few quick checks tin can save you a bunch of time and or money.
The nearly common trouble in a submersible pump motor is h2o ingress. Whether it be entry though damage to the electric cable, motor housing or seal system the results are the aforementioned. H2o and electricity don't mix well and about oftentimes end in what is referred to every bit a stage to basis mistake. When this happens electricity unremarkably independent within the motor windings "leaks" through damaged electric insulation inside the pumps motor and reaches the motor case/ ground excursion.
Fortunately for pump users the slow ingress of water does not immediately upshot in a catastrophic failure but does crusade the winding insulation to weaken, which in fourth dimension eventually does consequence in a major motor failure.
If a phase to basis leak has resulted in a catastrophic failure there will be picayune to no electric resistance betwixt the power usher and the pump ground circuit. This is a clear indicator that the insulation at one or more points has completely failed. This type of failure tin often be detected with an inexpensive multimeter or ohmmeter. A reading of zero ohms (or close to it) on the everyman setting clearly indicates a major problem. (run into below)
If the insulation is only weakened simply basically still intact, the applied voltage from a multimeter is not sufficient to detect a problem. To discover this condition a much higher voltage must be practical. Insulation resistance testers generate much higher voltages, upwardly to 1000VDC or more. These instruments are frequently referred to by the brand name 'Megger', simply are available from many different test equipment manufacturers.
Higher test voltages can generate leakage currents large enough to yield much more accurate results than a multimeter. Found early, motors with low readings tin can often exist disassembled, dried out, and re-dipped to add actress insulation. This is far more cost effective than a full rewind. Below is a picture of a mod Insulation resistance tester and beside it an older crank-powered one.
Insulation resistance testers often characteristic multiple ranges, such as 300V, 500V ,750V, or 1000 volts. To utilize a test the general rule is to make up one's mind the motors normal operating voltage and choose the next higher scale. (eg, for a Megger offering the iv voltages listed above, use the 750 volt scale for a 575 volt motor.) Ideally, yous want a reading of a few gigaohms or more, but I've personally installed 575 volt motors with 750 megaohms resistance to ground and had no bug. This value will subtract as the motor ages.
A Rubber Note. HIGH VOLTAGES IN USE!!! STAY DRY AND DO Not Touch THE ELECTRODES OR ANY PART OF PUMP WHILE TESTING WITH A MEGGER!!!
When looking to examination a submersible pump motor, commencement test the unit with the electrical cable still connected at the pump end but completely disconnected from the ability supply. If a fault or weakness is found, separate the supply cable from the pump past opening the pump and disconnecting the motor winding leads from the cablevision conductors. Check the motor and the cablevision conductors separately, you may exist lucky and have a skillful motor and but accept to re and re the cable.
Only to be clear, the stage to ground exam described in this blog will identify 90% of the faulty or weak motors, but simply a well equipped rewind shop tin can perform complete testing of a submersible motor.
Should y'all demand hands on support with a motor problem, or for that thing any pump problem please requite us a ring. We are here to help!!
RJ
Source: https://hevvypumps.com/en-blog/pumps/checking-the-condition-of-a-submersible-pump-motor/
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