Control Circuit Design Contact Inductive Break

[engineerithink]

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?

 

[itsmoked]

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