Contact US

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!

*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

VFD + submersible pump

VFD + submersible pump

VFD + submersible pump

Hello, I am working on a VFD and motor that that has me scratching my head.

What I should be seeing is 400Hz @ around 4.5A, but im barely able to hit 25Hz before the amps spike over 5.5A which is the what the pump's rating is at and trips the VFD. My input is 110VAC to 3phase 220V output.

Motor Spec:
3PH / 220V / 5.5A MAX / 400Hz MAX / SF 1.6 / 22800 RPM / 0.5HP

Controller is an Invertek IP66(NEMA 4X): 0.37kW-22kW, 110V/230V Single Phase input from 0.5HP - 30HP
Controller Settings:
400Hz/RPM Max / 0Hz/RPM MIN / Motor Rated Voltage= 220V / Motor Rated Current= 5.5 / Motor Rated Frequency= 50 / Motor Rated Speed(RPM)= 0 / Low Freq Torque Boost= 0 / Pump Mode 110% current limit, Variable torque, spin start off, current limit reduction.

Not sure if Im missing something in the settings or maybe box needs wired differently, spoke to Invertek support and they are scratching their heads too. I swapped motors and leads and experiencing the same issue, used the old controller to double check the pump and leads and it worked fine.

Any ideas/suggestions?

RE: VFD + submersible pump

I just figured it out, I need to increase Low Frequency Torque Boost to 3.0%. All myother settings staid the same, I guess I didn’t increase it enough an that was enough to throw it out of whack.

So, current settings with things working are:
400Hz/RPM MAX, 0Hz/RPM MIN, Stop Mode 0, Energy Opt. 0, Rated V 220V, Rated Current 5.5A, Rated speed 0, Low f Boost 3.0, Op mode 1(don’t know if it would help to change to 0, didn’t see a difference yet).

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! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close