Hi,
I work as an electrician and lately we've been installing door-magnets (Reed switches) in a nursing home to indicate when a door is open or not.
Some of the reed switches seem to get stuck every now and then so that even when the door is open the switch stays in closed position.
Giving it a couple of taps with your finger opens it.
The switch is powering the coil of a Releco 24VDC relay when door is closed, and goes off when door is open.
I´m guessing that since the coil is an inductive load it may cause high inrush current or arc-current when switching, causing the tiny reed-switch to get stuck.
This is just my theory though, and I guess a bi-directional TVS diode in parallell with the coil might help on the problem.
If I´m gonna try this, I´m wondering how to choose the right one?
We have 24DC thats going to power a Releco 24VDC relay coil through the magnetic contact (reed switch) , probably this one:
https://www.elfadistrelec.no/Web/Downloads/he/et/C7A2x_eng_datasheet.pdf
Looking through rs-online.com, I end up with 444 different types to choose from:
https://no.rs-online.com/web/c/semi...iode&applied-dimensions=4294876280,4294821500
What should I look for?
I work as an electrician and lately we've been installing door-magnets (Reed switches) in a nursing home to indicate when a door is open or not.
Some of the reed switches seem to get stuck every now and then so that even when the door is open the switch stays in closed position.
Giving it a couple of taps with your finger opens it.
The switch is powering the coil of a Releco 24VDC relay when door is closed, and goes off when door is open.
I´m guessing that since the coil is an inductive load it may cause high inrush current or arc-current when switching, causing the tiny reed-switch to get stuck.
This is just my theory though, and I guess a bi-directional TVS diode in parallell with the coil might help on the problem.
If I´m gonna try this, I´m wondering how to choose the right one?
We have 24DC thats going to power a Releco 24VDC relay coil through the magnetic contact (reed switch) , probably this one:
https://www.elfadistrelec.no/Web/Downloads/he/et/C7A2x_eng_datasheet.pdf
Looking through rs-online.com, I end up with 444 different types to choose from:
https://no.rs-online.com/web/c/semi...iode&applied-dimensions=4294876280,4294821500
What should I look for?