ABB ControlMaster CM10 User Manual page 33

ControlMaster CM10, CM30 and CM50
Universal process controllers,
...Basic / ...Loop 1 Control / ...Autotune
Autotune Operation
The Autotune sequence is shown in the following figure:
SP
A
B
C
PV
IM/CM/B–EN Rev. H
1 1 1
/ , / and / DIN
8 4 2
1
Set the first step value and dynamics required. For best results, select the largest initial
output step size that can be tolerated by the process.
2
Autotune is enabled only if the control type is PID.
D
3
Start Autotune from the Operator menu.
Monitors a noise A and calculates a hysteresis value.
4
User-defined initial step in the output B. When the process exceeds the hysteresis
5
value the output is stepped down.
Adjusts output amplitude automatically C so PV disturbance is kept to minimum
6
required.
7
When consistent oscillation is established
settings are calculated from the process dynamics monitored.
6 Basic Level
D
, the Autotune process stops. Optimum
31