Rockwell Automation 900-TC32 Digital Temperature Controllers, Series B - Manual (Page 305)

Publication 900-UM007D-EN-E - January 2011
Parameter Functions & Definitions 5-77
AT Calculated Gain
AT Hysteresis
Limit Cycle MV Amplitude
Conditions of Use: Control must be configured to 2-PID control. Normally
use the default values for these parameters
Function: The AT Calculated Gain parameter sets the gain when PID values
are calculated using AT. When emphasizing response, decrease the set value.
When emphasizing stability, increase the set value. The AT Hysteresis
parameter sets the hysteresis for limit cycle operation during auto tuning when
switching ON and OFF. The Limit Cycle MV Amplitude parameter sets the
MV amplitude for limit cycle operation during auto tuning.
Note: When temperature unit is °F, the default is 1.4.
Related Parameters
• AT execute/cancel (Adjustment function group, page 5-25)
Input Digital Filter
Function: This parameter allows you to configure the time constant of the
controller’s input digital filter. Figure 5.12 shows the effect on the input data
after passing through the digital filter.
Table 5.CN
Parameter Configuration Range Units Default
AT Calculated Gain 0.1...10.0 --- 0.8
AT Hysteresis Universal input:
0.1...999.9 ° C or ° F 0.8 (see note)
Analog input 0.01...9.99 %FS 0.20
Limit Cycle MV Amplitude 5.0...50.0 % 20.0
at-g
at-h
lcma
inf