I am using a relay to turn ON/OFF the AC load. But when i turn ON and turn OFF the AC load (230 VAC) 3-4 times my controller gets hang. Here is my circuit diagram for the relay.
The ground is common in all over schematic.
View attachment 247930
What changes do I need to do for improving the noise?
Current of the load is approx. = 8.5AmpsWhat is the current of your load and its inrush relative to your relay, is the relay contacts sticking?
Relay circuit and controller circuit is on the same board.How close is the relay to the controller circuit?
Sure. i will try changing the diode.The 1N4148 diode datasheet specifies that the maximum forward bias current is only 200 ma.
It could be that by exceeding this current level in the return current loop there is a hang-up defect of some type that is occurring. So try replacing D6 with a more suitable diode such as a 1N4001 to see if there is better performance. ... Also check to see if D6 is becoming warm or hot prior to replacing.
i will go through that pdf.You can search lot of info from Google by "suppress noise from AC load relay contact", I got this:
https://docs.rs-online.com/1091/A700000006618299.pdf
Sure. i will look in to this..You need a suppressor (capacitor) to avoid the power peaks. It's better to put it on you power switch, to ground it faster. Also check your power supply rectifier as well (if you use any bridge). Sometimes the power supply doesn't act as they mention on the catalog.
The 1N4148 diode has to carry the coil current for just the few tens of ms it takes for the coil magnetic field to collapse, and the coil current is likely well below the diode transient peak current rating, so I would think that is not a likely cause of the problem.The 1N4148 diode datasheet specifies that the maximum forward bias current is only 200 ma.
Just disconnecting the power would tell if it were needed or not. Should be even simpler.You might also try a simple R/C snubber across the contacts.
by Duane Benson
by Jake Hertz
by Jake Hertz
by Jake Hertz