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Sirhc
29.05.2010, 17:42
Hi

I have 2 different kinds of fans to reduce the temperature.

1 x large fan, which is very quiet and works wonderful in the winter time.

Set of 5 x smaller fans but more noisy.

Now that it is getting warmer, the 1 larger fan cannot cope reducing the temperature effectively so I needed to add the other 5 as well, but they are noisy in the living room and I would like them to come on only if temperature gets say > 26.

is it possible to have the large fan come on when temperature > 25.4 and then if the temp goes above 26 to let another socket switch on the 5 small fans?

I have a Profilux II Plus with only one temp. censor.

Chris

Blahenazo
30.05.2010, 06:40
I would make a virtual probe of your temp sensor
and then put the nominal value of the virtual different then the real probe.
attach fan1 to the socket where you have temp probe 1
attach fan 2 to the socket where you assign the virtual probe


remark; if you have never worked with virtual probes , you need to make them on the system itself. its not possible to create them in PLC. once created you can configure/monitor them like normal probes in PLC.

Sirhc
30.05.2010, 07:59
I would make a virtual probe of your temp sensor
and then put the nominal value of the virtual different then the real probe.
attach fan1 to the socket where you have temp probe 1
attach fan 2 to the socket where you assign the virtual probe


remark; if you have never worked with virtual probes , you need to make them on the system itself. its not possible to create them in PLC. once created you can configure/monitor them like normal probes in PLC.

Many thanks Blahenazo, I did not know it was possible and so easy.
It works perfectly!!

Chris