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Hi there
I usually do the following to get a hysterisis around a set point T:
CONSTANTS 3 TSet = 35 dTOn = 1 dTOff = 2 EQUATIONS 4 on = LT(T, TSet - dTOn) off = GT(T, TSet + dToff) between = NOT(on)*NOT(off) ctrlOn = on + between*ctrlOnRecall UNIT 1 TYPE 150 PARAMETERS 3 1 1 1 INPUTS 1 ctrlOn 1 EQUATIONS 1 ctrlOnRecall = [1,1]
To - hopefully - make things less verbose I was thinking I could use type 2. However, I can't figure out how to set the INPUTS to get the equivalent behaviour.
Thanks for your help,
Damian
For a heating application you would assign your setpoint to the "upper input temperature" and connect the temperature that you are monitoring to the "lower input temperature." If you want a 2C deadband centered around the setpoint then you would set your upper deadband to 1C and your lower deadband to -1C.
For a cooling application the deadband definition stays the same but your setpoint would be assigned to the "lower input temperature" and the temperature you are monitoring would be connected to the "upper input temperature"
As a side note, there are a number of thermostat components (such as Type166 or Type108) in the standard library that allow you to define controllers with hysteresis without having to fight with Type2's settings.
kind regards,
David
