What Is A Good Ohms Reading For A Motor To determine whether a 3 phase motor is still good or has gone bad a simple ohmmeter test across the windings of the motor will reveal its true state of health
Minimum test value of motor insulation resistance is 1 Meg Ohm 1 M See how to measure insulation resistance of Electric Motor With the motor running check the full load amps FLA with a suitable meter or preferably a clamp A very high resistance reading generally greater than 10 megaohms will indicate the motor insulation is good It is recommended to consult with the motor manufacturer to determine the appropriate reading
What Is A Good Ohms Reading For A Motor
What Is A Good Ohms Reading For A Motor
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The acceptable Megger reading for a motor primarily depends on its voltage rating Typically for low voltage motors up to 1 000 volts readings between 50 to 100 megaohms M are considered satisfactory Examine the name plate thoroughly With a multimeter measure the resistance between motor frame body and earth A good motor should read less than 0 5 ohms Any value greater 0 5 ohms indicate trouble with the motor
Insulation resistance should be approximately one megohm for each 1000 volts of operating voltage with a minimum value of one megohm For example a motor rated at 2400 volts should have a minimum insulation resistance of 2 4 megohms The resistance will tell you the stall current LRA Locked Rotor Amperes but only if you know the operating voltage For a given motor size and construction and therefore horsepower a higher resistance probably indicates a higher operating voltage
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One item to consider is comparison readings such as a 3 wire circuit L1 reads 2000 megohms L2 reads 200 megohms and L3 reads 2000 megohms While not a major issue I would want to know why L2 was low The Flukes we use have a pretty good low ohm scale that can catch shorted windings Depending on the size of the motor Most of ours are pass fail and we do not do predictive maintenance or haven t for some years now It s a good idea if you can schedule down time and keep proper records
Readings vary from 4000 Megs down to tens of thousand of ohms Megger results are consistent on 500 and 1000 volt tests With my background in aviation and the 100 MegOhm go no go rule this has worked for 25 years 3 phase motor winding resistance values Using Ohm meter Disconnect all power from the system Check all three wires singly T1 T2 T3 three phases to the ground wire
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To determine whether a 3 phase motor is still good or has gone bad a simple ohmmeter test across the windings of the motor will reveal its true state of health
https://sage-advices.com › what-is-an-acceptable-ohm-reading
Minimum test value of motor insulation resistance is 1 Meg Ohm 1 M See how to measure insulation resistance of Electric Motor With the motor running check the full load amps FLA with a suitable meter or preferably a clamp
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What Is A Good Ohms Reading For A Motor - On a new motor this value should be much higher usually 1000 meg ohm or better and should not be less than 1 0 The recommended minimum insulation resistance IR 1 min test results in megohms should be corrected to 40 C and read as follows 1
