ControlMaster CM10, CM30 and CM50
Universal process controllers,
1
/8,
1
/4 and
1
/2 DIN 6 Basic Level
30 IM/CM/S–EN Rev. R
…Basic / …Loop 1 Control / …Autotune
First Step 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.
Dynamics Used to configure Autotune to give optimum results according to the type of process being
controlled.
Normal
Determines if derivative control is required automatically and calculates the control settings
accordingly.
Deadtime
Sets the proportional and integral terms to give optimum control for the deadtime process
(higher proportional band [lower gain] and shorter integration time).
PI
Used for processes where it is known that derivative control is not required.
Reset If the controller is transferred to another process or duty, Autotune must be reset. The current
PID (see page 30) settings are retained but the internal process data is cleared ready for a
completely new process with different characteristics.
PID The controller’s PID (proportional, integral and derivative control) settings (see page 30) can be
commissioned using the Autotune (see page 29) function and / or they can be adjusted
manually.
Proportional Band 1 Set as % of engineering range.
Integral Time 1 Set in seconds per repeat. To turn integral action off, set to 0 or 10000 s.
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