How do I keep my relay contacts from sticking?
Your relay contacts need a snubber and/or MOV/TVS to suppress the inductive spike when switching an AC inductive load (your valve). Without the suppression, the resulting arc can cause the contacts to “stick” (weld). If your load were DC, a diode across the coil would be the more common solution.
What causes a relay to stay on?
Relays can stay closed due to retained magnetism in the pole pieces. I used to repair electric fencers which would have this problem after many cycles. The relays had a brass screw which stopped the pole pieces closing fully. This would wear down after a few years and allow the relay to stick.
Can car relays get stuck?
It can get stuck in the off position or the on position. If you can get your engine started and it stalls out afterward, you might have a fuel pump relay that’s stuck in the on position. If your engine is stalling, it’s worth testing your fuel pump relay to see if that’s the problem.
Can you unstick a relay?
Yes, relays still stick with no load. Checked continuity. If you give them a “knock” on top the relays “unstick”.
What causes a static load on a relay?
I suspect that although your static load current is well within the relay’s capability, the surge current when it closes, probably due to charging caps and/or firing up an SMPS, is welding the contacts.
Why are the reeds sticking to the relay?
It sounds like the relay is close to something that has become magnetized enough over time – because of the making and breaking of the relay’s magnetic field – that its biasing the reeds OFF when they’re supposed to release. Thanks for contributing an answer to Electrical Engineering Stack Exchange! Please be sure to answer the question.
Why is my SPST NO relay not opening up?
We are experiencing a problem where the mechanical switch of a SPST NO relay ( COTO 9007-05-01) is not opening back up when the coil is de-energized. Current keeps flowing through the switch until we give the relay a (somewhat gentle) flick.
How can I soft start a SMPS relay?
My solution was to cause the device that I was switching (that was powered by an SMPS) to soft-start using an LCR network between the output of the relay and the input to the device.