Hi to you all, well this migth no be an electronics question, but am sure if theres is an answer may be here...
the thing is... I have an Arduino controled Meat chiller...
Description of the system;
Here is a video of the thing itself ;
The arduino acts; reciving an signal form termostat... then if the temperature is (HIGH) turn on the compressor and all the fans of the evaporator... if the temperature reach (LOW) stop the compressor and leaves one fan (the fan cycling like these; If fan < 4, fan++) means each time the compressor stops, start another fan.
Here can be found some diagrams, there are by hand... becasue isnt finish;
http://forum.arduino.cc/index.php?topic=280681.0
The photos appear on the first entry... its on spanish, because I have to solve some issues with the code... but all diagrams are there.
Problem to solve;
The control panel uses LED indicator ligths, at 220V... they should be ON and OFF with each evaporator motor, but instead all keep ON all the time, the reason; A small (2.0-2.4VAC) voltage return from each motor fan (induction motors). Keeps all the GREEN lights on... meaning You can really tell if there is all the fans on, just one, or are stop.
I have to investigate the electrical nosie generated by the contactors at the uncoupling... and the answer to thath is to add an Varistor to -resist- the voltage peak... Now... im not very familiar, but there is some sort of decive like the Varistor but in negative mode; meaning if there is not a minimum of voltage (205VAC) be non conductive?.
I know its precisly a transistor, but, it will work on AC? just to turn the leds ON??
the diodes do too, but I think the damague if the supply voltage is bigger, and even so, its AC... two diodes?
Well.... Any how... I will let this in here, I hope some one can help me.
Thanks in advance.
-Alex Santiago.
the thing is... I have an Arduino controled Meat chiller...
Description of the system;
Here is a video of the thing itself ;
The arduino acts; reciving an signal form termostat... then if the temperature is (HIGH) turn on the compressor and all the fans of the evaporator... if the temperature reach (LOW) stop the compressor and leaves one fan (the fan cycling like these; If fan < 4, fan++) means each time the compressor stops, start another fan.
Here can be found some diagrams, there are by hand... becasue isnt finish;
http://forum.arduino.cc/index.php?topic=280681.0
The photos appear on the first entry... its on spanish, because I have to solve some issues with the code... but all diagrams are there.
Problem to solve;
The control panel uses LED indicator ligths, at 220V... they should be ON and OFF with each evaporator motor, but instead all keep ON all the time, the reason; A small (2.0-2.4VAC) voltage return from each motor fan (induction motors). Keeps all the GREEN lights on... meaning You can really tell if there is all the fans on, just one, or are stop.
I have to investigate the electrical nosie generated by the contactors at the uncoupling... and the answer to thath is to add an Varistor to -resist- the voltage peak... Now... im not very familiar, but there is some sort of decive like the Varistor but in negative mode; meaning if there is not a minimum of voltage (205VAC) be non conductive?.
I know its precisly a transistor, but, it will work on AC? just to turn the leds ON??
the diodes do too, but I think the damague if the supply voltage is bigger, and even so, its AC... two diodes?
Well.... Any how... I will let this in here, I hope some one can help me.
Thanks in advance.
-Alex Santiago.