adccommunitymod (AutomationDirect) asked a question.
Created Date: November 11,2018
Created By: plangla
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I'm new to programming PLCs. I am designing a temperature control system to turn off an evaporator's fans and liquid valve when the temperature reaches a desired temperature. I am able to get the fans and valve to turn off at the set temperature, BUT the output coils CHATTER. What would anyone recommend to fix this issue? Is it possible to have it turn off and not come back until a differential temperature has been reached? I not sure what to? My PLC is a DL06 with a FO-04RTD. Thanks in advanced.
Created Date: November 11,2018
Created by: plangla
I'm new to programming PLCs. I am designing a temperature control system to turn off an evaporator's fans and liquid valve when the temperature reaches a desired temperature. I am able to get the fans and valve to turn off at the set temperature, BUT the output coils CHATTER. What would anyone recommend to fix this issue? Is it possible to have it turn off and not come back until a differential temperature has been reached? I not sure what to? My PLC is a DL06 with a FO-04RTD. Thanks in advanced.
Created Date: November 11,2018
Created by: bcarlton
Use two compare points. Once the temperature has reached the lower level reset a bit. With the bit off wait until the temperature reaches the higher compare point to turn the bit on. The ON state of the bit indicates the cooling equipment should run. You will have to determine how much differential is appropriate for your application.
Created Date: November 11,2018
Created by: plangla
Thanks Bernie I will try that