If its zero or reads some continuity at all then a problem is present with the motor or cable. Set the voltage level of the insulation resistance tester to 500V.
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In this video you will find out how to test 3-phase induction motor.
How to test a 3 phase motor. This is a short instructional clip describing how to check winding resistance on a 230460 volt 3 phase 60 Hz 9 lead motor. 1 Disconnect the motor from power supply using main breaker 2 Use do not operate tag to avoid injury 3 Open the motor terminal box 4 Check for current using the testerGround motor terminals. Readings should be infinite.
More advanced testing requires specialized tools. Well learn how to identify windings check winding. A three-phase motor must be wired based on the diagram on the faceplate.
Unlike an ohmmeter a megger can measure high-voltage resistance values which are generally the kinds of values you will encounter with three-phase motors. If the lead tests resulted in normal readings the next step will be to test the capacitor. Check all three wires singly T1 T2 T3 three phases to the ground wire.
To measure the resistance in a three-phase motor you will need a megohmmeter otherwise known as a megger. As shown below the indicated terminal matrix blue lines shows the way the windings of a 3 phase motor should be tested with an Ohmmeter. Unlike three-phase motors a single-phase motor uses a capacitor to function.
For tests well use MEGGER MIT 310. The first step is to figure out the voltage of your phases. This addresses the 3 phase motor in the system.
3 phase motor winding resistance values Using Ohm meter. It will usually be low enough under 30 O for the audible continuity indicator to sound. This video has been created by.
Check the motor frame earth from phase to phase U to E V to E W to E. The trick is knowing which leads to hold on to and which wires make no difference at all. How to check a 3 phase motor system.
Disconnect all power from the system. If the reading is infinite your motor should be fine. Locate the capacitor and remove it.
The windings all three in a three-phase motor should read low but not zero ohms. If you get a zero reading or any continuity reading you have either a motor problem or a cable problem. For a three-phase motor the isolation resistance can usually be measured between each motor winding or phase and between each motor stage and motor frame earth by an insulation tester or Megger 4.
Set the voltage setting of the insulation resistance tester to 500V. Check from phase to phase U to V V to W W to U. Many simple across the line single-phase and 3-phase motors used in household appliances and industry respectively can be checked simply by changing the range of the ohm meter to the lowest offered R X 1 zeroing the meter again and measuring the resistance between the leads of the motor.
Once you have tested a few 3-phase motors the process will come easily. 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. Im Baljit Johal I like to make things and make videos about All Do It Yourself projects included wood working project Tool Review Entertainments Web ba.
Testing a three-phase electric motor without a trip down to the repair shop requires a cautious approach but happily all you need to start with is a volt-ohmmeter and some simple hand tools. That being said there is a wide range of different motors and what you have on hand can be completely different. Start by completely disconnecting the spindle motor from all power sources.
In the United States for low voltage motors below 600v you can expect either 230v or 460v. The smaller the motor the higher this reading will be but it should not be open. Items you will need.
Those are described below. Testing a 3-phase motor is as simple as holding the leads of a volt ohmmeter. Check each wire including T1 T2 T3 and the ground wire.
Working through the system Motor to disconnectoverloads contactor and. For a three phase motor insulation resistance is usually measured between each motor winding or phase and between each motor phase and motor frame earth using an insulation tester or megger.
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