Help with Relays


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Old 06-16-14, 05:09 PM
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Help with Relays

I have 3 controllers that need to control a device with a 24VDC current. Is there a way possibly utilizing relays to achieve this and provide back feed protection in the event more than one were accidentally activated?
 
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Old 06-16-14, 05:13 PM
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Welcome to the forums.

You have three controllers that can operate the same 24vdc control device. You don't want the voltage from one controller to re-enter another one..... is that correct ?
 
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Old 06-16-14, 05:19 PM
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Yes, that is correct. There are three controllers in different locations that all need to be wired to the same device.
 
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Old 06-16-14, 05:33 PM
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Do they just switch positive (+) and share a common ground ?

Or does each controller generate its own 24vdc.
 
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Old 06-16-14, 05:37 PM
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Each controller generates it's own 24VDC.
 
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Old 06-16-14, 07:48 PM
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If the negative of the 24vdc is referenced to ground then you can just use the diodes to isolate each controller. The diodes can be almost anything 1N4001, 1N4002, 1N4003. General purpose.... minimum 50vdc and 1A.

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If the negative of the 24vdc must be isolated from ground then you need to use isolation relays. Anything basic... 24vdc coil, N.O. switch.

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