Reed sensor sticking

Juanitop13 · Nov 13, 2013

Hello, Iam new to the whole PLC world. I am experiencing some problems with 2 wire reed sensors. When the bore of a cylinder is retracted the sensor closes but the sensor at the top end still shows as if it is closed. Is this current leakage? How can I fix the leakage?

strantor · Nov 13, 2013

I hate those stupid sensors. They get like that and if you put a magnetized screwdriver near them, they will straighten themsleves out, but only until next time. All I know to do is replace them. They seem to fail at an unacceptable rate. Or maybe I just don't know "the trick."

Nirmalya Basu · Nov 13, 2013

Check the sensor may be it gets damaged or check the sensor cable.

keithkyll · Nov 14, 2013

If you draw too much current, the contacts will weld. Are you driving a PLC input (OK) or a large relay (not OK)?

balash · Nov 14, 2013

personally i would avoid reed sensor if i could. bad experience with them and the accuracy wasn't high, maybe 85% up to 90%.

JesperMP · Nov 14, 2013

Reed sensors are very feeble, both mechanically and electrically.
Reed sensors wear out after extended use.
My advice is, exchange all reed sensors for new 24V PNP sensors.

shooter · Nov 14, 2013

turn it around so the magnet field is other way around, the reed switch will be demagnetized. the simple remove is sometimes enough, and yes overcurrent etc.

Reed sensor sticking

Juanitop13

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strantor

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Nirmalya Basu

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keithkyll

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balash

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JesperMP

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shooter

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