The Eurotherm 3216 is an innovative controller that provides precision temperature control as well as control of numerous other process variables all together. It also has a wide range of additional advanced features that you will not find on other controllers in this class.
Reverse Acting or Direct Acting
It is important to know how to set up the control action on this instrument for a particular application. If you want your Eurotherm 3216 to produce and output when the set point is above the process variable, such as the temperature, you will need to use reverse acting control. On the other hand, if you need your output to be at zero while the temperature is below your set point, then you will need to use direct acting.
To alter this specific value, press the page key and hold it down until you see “LEV 3” appear on the screen. At this point, you will then enter code “3”. Now, press the page key eight times, until you see “CTRL” appear on the instrument screen. This is the control list. Then, you will need to press the scroll key three times, until you see “CTRL.A” on the screen.
You will see where your control action is currently set. For example, if you see “REV”, which is a control action for the set point and the temperature. When the set point is higher than the temperature, the output will then be activated.
In order to change this, you will need to press the page key seven times, until you see “ACCES” on the screen of your Eurotherm 3216. Then, press the scroll key and then press the up arrow key for configuration, or “ConF”. Now, all you need to do is continue to scroll up to enter the number four code.
Press the page key eight more times, until you see “CTRL”. Again, this will be your control list. Press the scroll key three times to get back to “CTRL.A”. Use the up arrow key to toggle between direct or reverse acting. Once you have made your selection, press the page key and the scroll key together at the same time. Then, press the arrow down key.
Now, you should not see any output of your set point is higher than your temperature. If you lower your set point value, you will then be able to see the output as it begins to activate. This is an example of direct acting control action, which is the opposite of reverse acting.
