CODESYS - the IEC 61131-3 automation software

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PostPosted: Fri May 19, 2017 7:50 pm 
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Joined: Thu Feb 23, 2017 5:07 pm
Posts: 50
good evening,
I wanted to check my two electric rolling shutters via plc with codesys.
Since the rolling shutters have no limit switch to connect I thought to activate a 30-second timer both to raise and lower the rolling shutters.
For some time everything worked well but today I realized that the shutters did not open completely.
I tried then from the normal buttons and I realized that the rolling shutters lost the limit switch settings.
If I hold down the button to close the roller shutter continues to rotate.
But the engine's internal limit switches do not interrupt power?

Give me some info on how to handle them?

Thanks, Alberto


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PostPosted: Wed May 24, 2017 5:35 am 
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Joined: Wed Dec 09, 2015 4:05 am
Posts: 45
I would still say you have to go with two timeouts, one for raise and one for lower.
Yes, without limits some keep going until simething breaks and they overload.
Hint: Some lose their limits when controlled on the same phase like another shutter without a relay. Don't ask me why because I never understood what's the difference between having two relays doing the same action and having a phase go to two shutters.
I'd always buy shutters with mechanical limits if I can.

Sent from my SM-G935F using Tapatalk


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