VFD Question


Old 08-27-13, 04:40 PM
Thread Starter
Join Date: Aug 2013
Location: USA
Posts: 13
VFD Question

Is anyone familiar with VFD? I have some questions but don't want to bother the forum if it's beyond the scope of the forum.
Sponsored Links
Old 08-27-13, 05:08 PM
Nashkat1's Avatar
Join Date: Mar 2012
Location: USA
Posts: 8,470
Welcome to the forums!

Is anyone familiar with VFD?
IDK. Which variety of VFD are you asking about? A variable frequency drive?
Old 08-27-13, 06:38 PM
Thread Starter
Join Date: Aug 2013
Location: USA
Posts: 13
Yes, Variable Frequency Drive - I don't know much about them so I don't know what you mean by 'variety'.
What does 'IDK' mean?
I'm trying to just learn more about them; what they can do and what limitations there might be; plus a couple of specific questions about some I found.
Old 08-27-13, 07:12 PM
Tolyn Ironhand's Avatar
Group Moderator
Join Date: Nov 2007
Location: Twin Cities, MN
Posts: 12,288
IDK = I don't know

VFD's are used for a variety or reasons. Mostly they are used to control the speed of a motor for a specific application like for a variable speed fan, or to help with the efficiency of a motor. They can also help with the hard starting of a motor by doing a "soft start".

As a matter a fact, we just wired a couple last week for an HVAC contractor.
Old 08-28-13, 12:30 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 46,277
Just to go one step further. They aren't like dimmers. They don't control voltage.
They actually change the operating frequency of the electricity to the motor.
Motors run on 60 cycle power. A VFD reduces the cycles as a way to slow down the motor.
Old 08-28-13, 10:40 AM
Join Date: Jun 2008
Location: VA.
Posts: 813
A drive changes voltage and frequency.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes