Honeywell HVAC400x Applications Manual page 140

HVAC400X – APPLICATION MANUAL
For example, an analog signal of 4...20 mA corresponds to the pressure of 0...10 bar.
P3.13.1.6 PROCESS UNIT MAX (ID 1034)
You can use this parameter to set the maximum value of the PID feedback signal.
For example, an analog signal of 4...20 mA corresponds to the pressure of 0...10 bar.
P3.13.1.7 PROCESS UNIT DECIMALS (ID 1035)
You can use this parameter to set the number of decimals for the process unit values.
For example, an analog signal of 4...20 mA corresponds to the pressure of 0...10 bar.
P3.13.1.8 ERROR INVERSION (ID 340)
You can use this parameter to invert the error value of the PID controller.
P3.13.1.9 DEAD BAND HYSTERESIS (ID 1056)
You can use this parameter to set the dead band area around the PID setpoint value.
The value of this parameter is given in the selected process unit. The output of the PID controller is locked if the
feedback value stays in the dead band area for the set time.
P3.13.1.10 DEAD BAND DELAY (ID 1057)
You can use this parameter to set the time that the feedback value must stay in the dead band area before the
output of the PID controller is locked.
If the actual value stays in the dead band area for a time set in Dead Band Delay, the PID controller output will be
locked. This function prevents wear and unwanted movements of the actuators, e.g., valves.
A
A. Dead band (ID1056).
B. Dead band delay (ID1057).
C. Reference.
EN2B-0417GE51 R0719
B
E
Fig. 37. The Dead band function
Legend
D.
E.
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C
Actual value.
Output locked.
D