The three-phase asynchronous motor is measured with a multimeter. How can the motor be grounded?
Friends, the use of multimeter resistance files measuring motor terminals and the resistance between the chassis, you can determine the value of the resistance, if infinite, then explain nothing. If the resistance is small, then it is grounded. But there are a lot of multimeter to measure the grounding resistance value is not accurate, some grounding resistance value is greater than the universal table measurement range, so the motor is grounded, is measured with a multimeter is not grounded, the general must use the shake table, that is to accurately measure megohmmeter.
The balance of three-phase.3. some short circuit or difficult to burn out the amount of R*1 measured by resistance profile, available short circuited any two ma current files, look at it carefully turn motor current is much longer, to see whether the exchange phase, almost. This method is to use the old motor to power the original remanence.
Measure the resistance with R*10K resistance and the insulation resistance of the shell. It should be above 500K
