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Problem with relay
Problem with relay
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Old 28th November 2017, 10:03 PM   #1
belyakove is offline belyakove  Netherlands
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Join Date: Jan 2017
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Default Problem with relay

Hi guys. I've bought NEC EA2-5NU relay that I planned to use in a muting circuit for my preamp. This one should be great for audio. However I have a problem with it. When I apply 5 volts to coil I can hear soft clicking but nothing changes with connections. NC contacts stay closed and NO contacts stay open. I tried running it through NPN transistor and directly from 5v power source and in both cases results are the same. One thing is when I first plugged it in, I accidentally reversed polarity of the coil. Can it be that it killed relay (bent contacts inside or something) or am I just doing something wrong?
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Old 28th November 2017, 11:19 PM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by belyakove View Post
When I apply 5 volts to coil I can hear soft clicking but nothing changes with connections.
NC contacts stay closed and NO contacts stay open.
You may have a latching type, where the coil polarity must be reversed to latch/unlatch.
http://www.mouser.com/ds/2/212/KEM_R...EB2-541006.pdf
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Old 29th November 2017, 08:30 AM   #3
belyakove is offline belyakove  Netherlands
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Ok, problem is kinda solved. I've checked datasheet 10 times and I for sure have non-latching type. I tried today to apply voltage in reverse polarity and it magically started working as it should. I checked datasheet 10 times again and it seems that there is a mistake in it or they made view from bottom which also seems weird to me. I've checked polarity of my supply and sure that everything is right.
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Old 29th November 2017, 02:47 PM   #4
rayma is offline rayma  United States
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Quote:
Originally Posted by belyakove View Post
they made view from bottom which also seems weird to me.
Good, the relays are always shown from the bottom, like tube pins.
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Old 29th November 2017, 02:49 PM   #5
belyakove is offline belyakove  Netherlands
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Join Date: Jan 2017
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Then it's my bad. Thank you for help!
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