×
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

Control Circuit Design Contact Inductive Break

Control Circuit Design Contact Inductive Break

Control Circuit Design Contact Inductive Break

(OP)
Hi

I am looking for a good book which describes how to design control circuits.  For example I have a 125 VDC circuit with one contact in series with a solenoid valve. The solenoid valve is 35 watts which means in draws .28 amps in a 125 VDC circuit.  The inductive break of my contact is 1 amp @ 125 VDC so I think I am fine.  What else am I missing?  Do I have to include the resistance in the wire or any other factors? What if I have a resistive element in series with the solenoid?  Are there any equations which relate the resistive and inductive break ratings of the contact?   

RE: Control Circuit Design Contact Inductive Break

No other resistance needed.  You might want to put a back biased diode across the solenoid as it will reduce arcing and increase the life of the relay contacts. Or not.

Keith Cress
kcress - http://www.flaminsystems.com

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