×
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

Soft Starters

Soft Starters

Soft Starters

(OP)
Does it worth to equipe ac ventilation motors with soft starters?

RE: Soft Starters

If a Ventalation moter is a large belt drive type a soft start goes a long way to saving berings and belts. If the ventelators stop and start alot this is even more of an issue. I have a building that has a air handler with no soft start. The blower only starts once a day but the jirk on the belts and berrings can be heard in the parking lot 100yards away. The customer is not the type to spend money on somthing that is not broken though. This motor is 60hp and the machine moves as much as 50,000 CFM. Granted this is a large machine but even a small blower like a two to five hp would benefit. Also if you have sensative equipment in the building the surge from a large moter starting can have a negative effect. The selling point for a coustomer for my area is our utility company charges extra for power demand spikes. The starting amp draw is reduced greatly with a soft start.

RE: Soft Starters

We specify VFD's frequently for energy savings and capacity control.

The added benefit is that we also get a 'soft-start' from the VFD. Although the application depends on cost and system design we have used VFD's on motor's as small as 3hp.

RE: Soft Starters

Sometimes the electrical utilities may insist on soft starts once a motor gets to a certain size.

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