×
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

Low Volatge Drive Selection Guidance

Low Volatge Drive Selection Guidance

Low Volatge Drive Selection Guidance

(OP)
Hi Engineers,
I am looking for guidance on selection of Low Voltage Drives on the basis of:

1.Dimensioning- torque,overloadability
2.Performance- V/f control, sensorless vector control,closed loopp vector control,static & dynamic accuracy of speed & torque, respose time

Searching threads didn't help, so I am writing this quetion.
If you can point me to such an existing thread, it would be great!
Thanks in advance,
D'man

RE: Low Volatge Drive Selection Guidance

Selection normally follows this sequence:  First, determine load continuous torque and peak torque.  Second, determine what that torque represents in terms of continuous motor amps and peak amps.  Third, determine the speed stability required by the load under varying load conditions.  Fourth, select a drive with continuous and peak ampacity to cover the above requirements and select a drive control technology that meets your speed stability requirements.

There are hundreds of other lesser issues but, for me, that's the "core" process for selecting drives.

RE: Low Volatge Drive Selection Guidance

It seems you looking for AC induction motor drives that supplied from AC directly. In this case what means "Low voltage"?

RE: Low Volatge Drive Selection Guidance

Low voltage (LV) usually means anything between 100 and 999 V AC.

Extra low voltage (ELV) usually is below 50 or sometimes 42 V AC.

Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

RE: Low Volatge Drive Selection Guidance

Many of us work for manufacturers and/or distributors of products, so we are restrained by etiquette from making recommendations for our own products. But have you checked the FAQs for this forum yet? The link is at the bottom of the front page of this forum near the bottom below the "Start a New Thread box, right where it says "Before you start."

To save time though, here are the 2 FAQs we collaboratively wrote as a jumping-off point to determine the type of drive you may need.

FAQ237-1062: What is Vector Control in a VFD?
FAQ237-1063: How does Vector Control compare to Servo Control?

Specific technical performance values are going to vary from mfr. to mfr., even from year to year within the same mfr., so any published list would be quickly obsolete. My general advice is, determine your performance requirements, maybe even the technology you think you need, then decide who in your local area does the best job of servicing drive customers. Not necessarily repair services, but application support and training, inventory etc. That will ultimately serve you better than any brand name.

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