I have a solenoid valve (12VDC, 540mA) that I would like to control with a 12VDC relay (15A SPDT). Is it possible to power the solenoid without an external power source seperate from the one powering the relay board (12V, 0.41A)? In the image, I have a logic signal in the input screws and I know that the relay is working with that signal (switching on and off with sound and light). The solenoid though does not seem to be powered. Should the wall outlet (currently going in at the DC power port) be stripped and connected to the input power screw terminal about ground? Ground power screw terminal currently is connected to ground of solenoid, and the other end of solenoid is connected to NC. Thank you for your help!
Electrical – Powering a solenoid valve with a relay and no external power source
power supplyrelaysolenoid-valvespdt
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Best Answer
A relay is just a switch. You have to provide power to the solenoid through the relay.
You can wire the solenoid to be powered by the 12V from the relay board.
When you send a signal to the relay board, it will supply power from the DC powersupply to the solenoid through the relay.