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| 2/24/2012 10:33 AM | |
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Posts: 23 Rating:
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Hi, I`m using 1212C CPU with SM1231 module. I want to connect my Q0.00 to a circuit closer with 220VAC coil. What is the correct wiring? Thank you!
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| 2/24/2012 5:25 PM | |
Joined: 4/22/2010 Last visit: 11/18/2024 Posts: 5697 Rating:
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Hello, |
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Problem solved? |
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| 2/24/2012 6:31 PM | |
Joined: 7/7/2010 Last visit: 12/5/2024 Posts: 15466 Rating:
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I could not agree more on both points of using 4 outputs and 230VAC across the plc relay contacts. If you burn up your plc outputs, you have to replace the plc... If you burn out the external relay controlled by the plc relay outputs, you only replace the external relay. Downtime is much less and cost is less. Plus, you can run 24VDC coils to control your 230VAC external device and not worry about the 2A contact limit for the internal contacts. (It is 2A right?)... If it is for development, the link provided above (with image) will get you there. For projects in the field, external relay is definitely the way to go. I'm completely with Marcjan on that! |
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| 2/27/2012 1:38 PM | |
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Posts: 23 Rating:
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I need only one output for turning on and of a furnace. So If I use the relays of the PLC I have to wire 220VAC to L1 and use Q0.0? And from what should I be afraid of burning the relays? When I burn one (Q0.0) it all goes down? Thank you!
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| 2/27/2012 2:01 PM | |
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Joined: 4/22/2010 Last visit: 11/18/2024 Posts: 5697 Rating:
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Hello, No, when you burn one output you have to remove CPU, open it and then try to replace the burned relais. If you connect your 230V to 1l, you have 4 230V outputs. So that's why i said use a small interface relais(24VDC) to switch your 230V relais. That way you keep the 230 away from CPU, interface relais are easy to replace in case of faillure. Regards, Marcjan |
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Problem solved? |
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| 2/27/2012 2:13 PM | |
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Posts: 23 Rating:
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Thank you! I already discussed this with my colleague and we are going for an additional relay. 24V to L1, then the other relay and the one with the 220VAC coil connected to the additional. So if something happens whe replace the additional relay. This is the better option if I understood right? |
| 2/27/2012 2:15 PM | |
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Joined: 4/22/2010 Last visit: 11/18/2024 Posts: 5697 Rating:
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Yes, It will be cheaper in the end. Regards, Marcjan |
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Problem solved? |
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| 2/27/2012 2:18 PM | |
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Posts: 23 Rating:
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Thanks! You were most helpful.
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