10-2014 gForce User Manual ● 81
Band: Band has the same unit as the setpoint and is tunable in the dap4™ controller.
Increasing the band makes the system more stable and increases the steady state
error. A good start for tuning the band is half of the setpoint. The default value is 18⁰F.
Integration Time: (Ti) Increasing Ti decreases the steady state error; but tends to
make the system less stable and increase the overshoot. Therefore, the Band must
increase in PI control and as a consequence the response speed will be slower. The
default Ti is 50 seconds.
Derivative Time: (Td) Derivative is the speed at which the system reacts to a change
in output. Increasing Td increases system stability, allowing the other two actions to be
increased (with the respective benefits) while maintaining the same stability. Increasing
the derivative time reduces the sensitivity to the output change. The default Td is 1
seconds.
C1 Offset: Compressor 1 will turn off at when temperature is below setpoint minus this
amount and other conditions will applied.
Delay Modulation: This is the time delay before the PID modulation loop starts to
work. Default at 60 seconds, selectable from 0 to 999 seconds.
If the above Control setting was set for “Return Temp”, the next screen will be as
followed
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