Please tell me how to use the multimeter to measure those aspects when the working circuit of construction machinery is out of order
Measure the control circuit first, and then measure the motor to short-circuit the ground, then measure whether the interphase is short circuited and check step by step.
This can be measured with a multimeter. The control part also checks the power supply before switching on. Is the voltage normal?. It can also be tested with a multimeter. In the control section, you can also use a multimeter for troubleshooting. It would be better if you had an oscilloscope.
Construction machinery movement, the executing agencies have cylinder action (hydraulic), motor and so on. Control parts are mostly weak current, drive parts and actuators are strong electricity (such as motor). When work is out of order. Generally check the power supply, the boot after the drive part of the power.
