×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Wiring from VFD to Motor

Wiring from VFD to Motor

Wiring from VFD to Motor

(OP)
Is there any special consideration one needs to take into account when wiring up a 480V motor from a VFD. I know distance is a factor but is there a need to use something other than 600v conductors?

RE: Wiring from VFD to Motor

You might try doing a web search or a search of this forum.  There has been quite a bit of discussion on this lately.

Special cables with multiple ground conductors or shielding are often recommended to reduce RFI coming from the high frequency components of the VFD output waveform.  A good ground conductor is essential.  Okonite C-L-X metalclad cable now comes standard with three ground conductors and makes an excellent cable for VFD to motor applications - there may be others that are similar.

Some type of metallic conduit or shielding is strongly advised and signal circuits should be routed away from this feeder to the extent possible.  

I'm sure you'll get some additional suggestions from some of the VFD experts.  

RE: Wiring from VFD to Motor

That's about as good as the advice is going to get. The point about shielding and/or metal conduit cannot be emphasized enough. The output conductors act like a radio transmission antenna when not shielded. Keep that in mind if you are planning on running in cable tray.

"Venditori de oleum-vipera non vigere excordis populi"

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources