How to Check Motors and Cables While at a Machine

Checking Motors and cables

Troubleshooting a motor unit while installing into a CNC machine is different from checking it on a test bench. In this video, we offer some best practices and tips that will let you make fewer mistakes during machine installation.

When drives fail, it is often recommended to not only check the drive components but to also check the motor and any surrounding modules that are connected to the drive. There are a few checks to perform before diving in with a meter and starting to take readings, and those can be found below:

  1. Verify the power to the machine is OFF! Many of the checks performed require cables to be disconnected from certain locations and if there is power present, this can put the person performing the checks into a hazardous situation
  2. Always use a “lock-out tag-out” system when going to do extensive troubleshooting and there’s a chance that you will walk away while in the middle of it.
  3. If a winding select contact is used, the megger test can be performed directly at the leads being disconnected from the drive unit. If any odd readings show up, it would then need to be checked on each side of the contactor to verify which end is causing the problem.

For additional questions or concerns regarding how to check drive and motor units while installing it into the machine, feel free to contact us by phone or email.

At Precision Zone, we guide our clients toward the best decisions that serve their business needs. If you have specific repair or replacement questions, get in touch with our expert customer support team at 800-551-4420 or

Written by:

Marketing & Creative Director at IcarTeam, and supporting afiliated businesses,
including Precision Zone, Precision Education Integrators and Alfra Tools.
Did you like this article? Click your favorite social media channel to share it with your friends and colleagues
You might also enjoy these articles:
Recent articles:


You know who we are, what we do and how we do it, so let's get started!


Get the latest news, tips, insights and product spotlights sent straight to your inbox weekly

By entering your email, you agree to our Terms of Service and Privacy Policy.