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ControlMaster CM10, CM30 and CM50Universal process controllers 1 /8, 1 /4 and 1 /2 DIN6 Basic Level…Basic / …Loop 1 SetpointsRamp ModeThe ramping setpoint facility can beused to prevent a large disturbance tothe control output when the setpointvalue is changed. The rate set applies toboth the local and the remote setpoints.PV3002001000Displayed local setpoint valueActual (ramping) setpoint value used byPID algorithm*1 HourTime*Example: Ramp Rate = 200 Increments/hrRamp RateLoop 1 ControlOn/Off HysteresisSets the ramp rate required in engineering units / hour.Note. Applicable only if Ramp Mode is On.Sets the hysteresis value in engineering units.PVONOFFReverse Acting Control OutputSetpointHysteresisValueNote. Applicable only if Control Type is On/Off – see page 55.PVONOFFDirect Acting Control OutputHysteresisValueSetpoint28 IM/CM/S–EN Rev. C
ControlMaster CM10, CM30 and CM50Universal process controllers 1 /8, 1 /4 and 1 /2 DIN6 Basic Level…Basic / …Loop 1 ControlModeAutotuneTurns the Autotune functionality on or off. When set to On, an Autotune can be started from the Operator level menus – see page 22.Autotune OperationAutotune is a user-activated feature that enables automatic setting of the controller PID parameters (see page 30) using an'at setpoint type' algorithm. Autotune changes the controller output and then monitors the process response to calculatethe optimum PID settings. Autotune uses a relay type function with hysteresis that initiates a controlled oscillation in theprocess. New PID parameters are calculated and stored in the controller automatically. Note. To achieve the best resultsfrom Autotune, switch the controller to Manual control mode (see page 5) and adjust the output until the PV is stable (closeto the normal setpoint) before initiating Autotune.SPABPVCD1 Set the first step value and dynamics required. For best results, select the largest initialoutput step size that can be tolerated by the process.2 Autotune is enabled only if the control type is PID.3 Start Autotune from the Operator menu.4 Monitors a noise A and calculates a hysteresis value.5 User-defined initial step in the output B. When the process exceeds the hysteresisvalue the output is stepped down.6 Adjusts output amplitude automatically C so PV disturbance is kept to minimumrequired.7 When consistent oscillation is established D, the Autotune process stops. Optimumsettings are calculated from the process dynamics monitored.IM/CM/S–EN Rev. C 29
Page 1 and 2: User Guide - Standard Functionality
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Refer to Section 7.5, page 63MenuPr
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