ATC770 Microprocessor-Based Pressure/Process Controller 67
algorithm is active.
Lower display: TD
Range: From 0.0 to 99.9 s.
Default value: 0.0.
AUTOMATIC SELECTION OF THE INTEGRAL PRE-LOAD VALUE - Group 2
Available: Always.
Upper display: Setting this parameter to Auto causes the controller to calculate the integral pre-
load value using the set point and process gain values. The process gain value is
estimated during the SMART (TUNE) function. The automatic computation of the
integral pre load value is reliable after a SMART trial. When this parameter is set to
Auto the integral preload value may be read but not modified by the front push-
buttons. Setting this parameter to manual causes the controller to reload the former
keyboard selected integral pre load value.
Lower display: AT.IP
Range: nAn (manual)/Auto (automatic).
Default value: nan.
INTEGRAL PRE LOAD - Group 2
Available: Always.
Upper display: Integral pre load value. The value may not be changed if the automatic computation
of integral pre load value is selected.
Lower display: IP
Range: From 0.0 to 100.0%.
Default value: 50.0.
TYPE OF CONTROL - Group 2
Available: Always.
Upper display: Type of control (proportional plus integral or proportional plus integral plus
derivative).
Lower display: AT.TYP
Range: PI/Pid.
Default value: PI.
AUTOMATIC SELECTION OF THE FILTER TIME CONSTANT - Group 2
Available: Always.
Upper display: Setting this parameter to Auto causes the SMART (TUNE) function to perform a
search for the best filter time constant before applying the power change. The SMRT
led will flash at a fast rate while the device is searching for the best time constant.
Lower display: AT.AFL
Range: nAn (manual)/Auto (automatic).
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