Today, we are going to show you how to troubleshoot your AC Servo Motor. Two of the most common failures that happen with the motors are over-current faults and ground faults. Below, we explain to you the three simple steps to static checking both of these faults. We have also included a video at the end to help see exactly what to do.
Always check the physical status of the unit before performing any other troubleshooting steps.
What to look for:
Before performing any static checks, verify that the DC Bus is discharged using a multimeter. Then you can disconnect the power cable from the drive. By not disconnecting the power cable, you could cause damage to the drive while megging the motor.
There are 3 things we are going to check with our megger:
- Motor connected to the power cable
- Power cable alone
- Motor alone
First, with the power cable attached to the motor, use a megger to check for ground faults between U, V, and W. Any reading of 300 megaohms or more is okay. Next, disconnect the power cable from the motor. Using a megger, check the inputs of the power cable to ensure the issue does not reside within the cable. Lastly, use a megger to check the motor through the pins of the power connector. Remember: A, B, and C pins on the motor are considered to be U, V, and W. Here is a video to help guide you through the process!