User manual - ATR121 - 19
7
Controller functions
7.1
Modifying main setpoint and alarm
setpoint values
Setpoint value can be changed by keyboard as follows:
Press Display Do
1
§ ¶
or |
Display shows the
command setpoint
and OUT1 flashes.
Increase or decrease
the main setpoint
value. Afer 4s display
shows the process.
2
Press twice
|
Display shows the
alarm setpoint and
OUT2 flashes.
Increase or decrease
the alarm setpoint
value. After 4s
display shows the
process.
8
Tuning
Tuning procedure allows to calculate PID parameters to
obtain a optimal regulation. It means a stable control of
temperature/process on setpoint without fluctuations and
fast response to deviations from setpoint caused by external
noises.
Tuning procedure includes calculation and setting of the
following parameters:
• Proportional band (system inertia, in °C for temperature).
• Integral time (system inertia expressed in time).
• Derivative time (defines the intensity of the controller
reaction to the variation of the measured value, normally
¼ of integral time). During Tuning procedure, it is not
possible to change the setpoint.
8.1
Auto-tune
Tuning procedure calculates the controller parameters, can be
manual/automatic according to selection on par. 27
tun
.
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