ABB ControlMaster CM10 User Manual page 34

ControlMaster CM10, CM30 and CM50
Universal process controllers,
...Basic / ...Loop 1 Control / ...Autotune
First Step
Dynamics
Normal
Deadtime
PI
Reset
PID
Proportional Band 1
Integral Time 1
Derivative Time 1
32
1 1 1
/ , / and / DIN
8 4 2
Defines the maximum size of the first output step in the autotuning process. Autotune adjusts
the output step magnitude according to the process noise and response to provide a reliable
measurement of the process characteristics with the minimum disturbance of the process. The
maximum setting provides the largest output step possible from the current output value.
Used to configure Autotune to give optimum results according to the type of process being
controlled.
Determines if derivative control is required automatically and calculates the control settings
accordingly.
Sets the proportional and integral terms to give optimum control for the deadtime process
(higher proportional band [lower gain] and shorter integration time).
Used for processes where it is known that derivative control is not required.
If the controller is transferred to another process or duty, Autotune must be reset. The current
PID (see page 32) settings are retained but the internal process data is cleared ready for a
completely new process with different characteristics.
The controller's PID (proportional, integral and derivative control) settings can be commissioned
using the Autotune (see page 30) function and / or they can be adjusted manually.
Set as % of engineering range.
Set in seconds per repeat. To turn integral action off, set to 0 or 10000 s.
Set in seconds.
6 Basic Level
IM/CM/B–EN Rev. H