×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

VSD/VFD Pump Controller PLC

VSD/VFD Pump Controller PLC

VSD/VFD Pump Controller PLC

(OP)
Dear Expert,

I have a question for certain condition as describe (commissioning step):

- a pump intent to serve multi-product of hydrocarbon. Let says product A and B. When the pump serve the Product A, the demand and certain capacity of the operation is satisfy. The pump using VSD to make power consumption effective and to make the rpm decreasing smoothly until the capacity of product reached.
- When the pump served the Product B ( different SG with product A ) the capacity demand of the operation is not satisfied (larger than demand requirement). We have done any trial and error to solve the problem, and we got one. We stop the pump suddenly by "mother" controller PLC. BUT it is not satisfied enough to do, because we need the smooth decreasing rpm of motor&pump to meet the certain capacity (consider life time of pump and power consumption efficiency).

Is there any suggestion or advice to solve my problem ? Maybe some of you ever met same problem that I am facing right now

RE: VSD/VFD Pump Controller PLC

Many VFD:s have inputs so you can select different sets of parameters depending on requirements. I know for sure that Siemens has that.

There are at least four parameter sets that can be chosen by inputting 00, 01, 10 or 11 on two terminals. That would make different ramp times possible and that would solve the problem.

Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.

RE: VSD/VFD Pump Controller PLC

Skogs is correct, most modern VFDs have selectable ramps rates that can be selected by toggling discrete inputs on the VFD. Alternately, if your PLC is controlling the VFD speed via (say) a 4-20mA signal to the drive, why not build variable ramp rates into the PLC?

RE: VSD/VFD Pump Controller PLC

(OP)
Thanks SKOGS and Groovy for the quick response, I will try your advice.

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


Resources

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