hapetter
Member
Hi.
I have an application where i want to control the temperature in a room with a resistive load, Controlling the load with a PLC (PID closed loop control).
Ok so im going to use a powercontroller. The power controller takes 4-20mA and controls the load 0-100%. To be able to control the temerature due to a temperature reference, then Im going to use a closed loop PID control approach.
So I have a PLC, a temperature probe (PT100), and a powercontroller.
So I have some basic control question, starting with this:
1.
The setpoint to PID is in degree Celsius. Lett say the setpoint is set to 30 degree Celsisus, then if actual value (temperature probe) is 30 degree celsius as well, then there is no error and the output of the PID is what? 0, 30?
2.
How can I make the output of the PID into 4-20mA signal? So if im in steady state (no error, then i like to output 4mA to the power controller.
Thanks!
Best Regards
Hans
I have an application where i want to control the temperature in a room with a resistive load, Controlling the load with a PLC (PID closed loop control).
Ok so im going to use a powercontroller. The power controller takes 4-20mA and controls the load 0-100%. To be able to control the temerature due to a temperature reference, then Im going to use a closed loop PID control approach.
So I have a PLC, a temperature probe (PT100), and a powercontroller.
So I have some basic control question, starting with this:
1.
The setpoint to PID is in degree Celsius. Lett say the setpoint is set to 30 degree Celsisus, then if actual value (temperature probe) is 30 degree celsius as well, then there is no error and the output of the PID is what? 0, 30?
2.
How can I make the output of the PID into 4-20mA signal? So if im in steady state (no error, then i like to output 4mA to the power controller.
Thanks!
Best Regards
Hans