Dear all
On the Picture attached is a SSR relay Vishay VO14642. I am going to control a 12v coil with 1.1A load.
Can you please advice where should the clamping diode be placed?
pic Diode1 showing diode where I think it should be placed.
Thank you
What is the intended purpose of that clamping diode?
Flyback. It is recommended to use diode with inductive loads to protect the device from rush current
Flyback and clamping are two very different things.
A flyback diode goes across the leads of the inductive load.
Can you clarify please? Also a bit of sketch related to my drawing would help a lot. Thanks
P.s. according to Wikipedia, clamp diode is one of the names for flyback and other names
That's a 12V DC, right?
It goes "backwards" across the inductive load, like in [u]this circuit[/u].
...So normally, the diode doesn't conduct. But, when power to the coil is cut-off the coil generates a reverse voltage. It can be a very-high voltage so the diodes "shorts out" the reverse voltage, keeping everything safe.
DVDdoug according to the drawing, placement of the diode shown in "diode1.png" is accurate. Can you confirm that please?
Thanks
Where is the other end of the coil connected to?
Chassis ground
And that's the same ground as the one in your schematic? Then it's in the correct place - in the schematic.
Physical location matters as well in this case, that's why I said before to connect it across the leads of the load. Actually, I should add: as close to the load as possible. Then it has maximum efficiency.
Yes, it's the same ground as in the schematic. Sorry I should note that on the beginning.
Thanks for your help