relays overload

Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=122668
Printed Date: June 09, 2024 at 12:56 AM

Topic: relays overload

Posted By: maor77
Subject: relays overload
Date Posted: July 13, 2010 at 11:59 AM

Hello,
I Connected my relay(24V , 4A) to DC motor. the motor moving but sometimes the relay stuck (I can hear that)like its just overload by the motor(when motor working it needs 24V,2A).
What can I do to resolve this problem?
thanks everyone.

Replies:

Posted By: t&t tech
Date Posted: July 13, 2010 at 5:11 PM

What type of relay are you using? 4amps overloading a relay, nope doesn't sound right!

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COMMIT YOUR WAY TO JEHOVAH AND HE WILL ACT IN YOUR BEHALF. PSALMS 37:5

Posted By: oldspark
Date Posted: July 13, 2010 at 7:56 PM

And does your supply handle the start-up current? (Check it with a voltmeter.)

The relay may need spark suppression for its contacts - typically capacitors are used (just like ancient car ignition points).

But yeah - as per T&T, let's start with what relay?

Posted By: maor77
Date Posted: July 14, 2010 at 6:01 AM

DK2A-24V
link:
https://parts.digikey.com/1/parts/747946-relay-mini-power-8a-24vdc-pcb-dk2a-24v.html

thanks!

Posted By: oldspark
Date Posted: July 14, 2010 at 7:19 AM

I can't see contact ratings for DC.

Although some think its 8A@250VAC means no problems for 4A or less DC, I disagree.
[It's a usually a contact plating issue but can involve other issues (like opening speed). Contacts can stop arcing when AC does a zero crossing - that doesn't occur with DC.]

Can you use a relay that's rated for DC instead? (Unless this relay is rated for 4A/24V DC inductive.)

Posted By: 91stt
Date Posted: July 14, 2010 at 5:25 PM

How many volts are you using to power the coil?
If you are trying to turn this relay on with 12 volts, you will get inconsistent results.
Panasonic DK2A-24V specs
According to the specs the contacts are good for 8A @ 30V for a resistive load.

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This information is provided only as a reference.
All circuits should be verified with a digital multi-meter prior to making any connections.

Posted By: oldspark
Date Posted: July 14, 2010 at 6:49 PM

That could be the problem - resistive load.