VFD drive motor not running!

If you are in the USA and have a client for this, you are practicing electrical engineering. For this, a PE license is required in most, if not all, jurisdictions. If you have a license, you are incompetent because you have not given sufficient information or carried out sufficient testing. While PE's in EE cannot know everything, they should know enough to ask meaningful questions.

I usually do not answer such inquiries so crudely, but I do have limits.

Bill

-- Fermez le Bush

Bill,

I am American and have a EE degree. As long as my company authorises me to test and perform measurements on their custom made equipment there is no need one to have a PE license. Unfortunately, a customer of mine happened to be in the land down under and happened to call for feedback and problems with the VFD drive. I simply wanted a second opinion on this matter.

Vsdguy

Well, the issue here is that you still have not supplied anywhere near enough information. Saying that it is reading 300V between phases means absolutely nothing meaningfull without a point of reference. For instance, if it is connected to a 400V 50Hz supply, and the speed command is 37.5Hz, then the output voltage SHOULD read 300V.

Th>Bill,

Bob,

Thank you Bob for your answer. Yes it was true that I didn't supply enough information about what supply the system is connected and what drive we are using and what are the motor ratings on the nameplate. I do apologize.

I started out new on this forum and since now its all clear to me I will be more detailed and ask of course in a nicer way. Thanks alot.

Vsdguy

practicing

Hi all,

I received more information about the drive and motor. The motor is a

22KW 2 pole FLC=37 amp 380-420VAC. The drive is rated at 22kW. The customer informed me that after correcting with me all the setup parameters that once activated it was trying to run not able to turn the motor. They were measuring 250VAC-350VAC between phases and .7 amps with their clamp meter when commanding the drive.

The application is for a concrete cutter. They are receiving a high pitch frequency noise and from the looks of some pictures that were sent to us it looked like there was alot of moist and dust that entered the drive.

I am sorry for not being able to provide detailed information earlier about this problem.

Customer concluded that the drive was faulty and are going ahead with replacing the drive.

Regards,

vsdguy

practicing