User Guide - Eurotherm Ltda

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nanodac RECORDER/CONTROLLER: USER GUIDEB2.4.7 MANUAL TUNING (Cont.)2. If overshoot is observed following the correct settings of the PID terms increase the value of ‘CBL’ bythe value of the overshoot in display units. If undershoot is observed increase the value of the parameter‘CBH’ by the value of the undershoot in display units.Display unitsInitial overshootPV approaching SPfrom above:adjust CBHSetpointPV approaching SPfrom below:adjust CBLInitial undershootTimeB2.5 SETPOINTFigure B2.4.6b Manual Cutback settingThe controller setpoint is the Working Setpoint which can be derived from:-1. SP1 or SP2, both of which are manually set by the user and can be switched into use by an external signalor via the user interface.2. From an external (remote) analogue source3. The output of a programmer function block.B2.5.1 Setpoint function blockAs well as providing a setpoint, the function block also provides:1. The ability to limit the rate of change of the setpoint before it is applied to the control algorithm.2. Upper and lower limits. These are defined as setpoint limits, ‘SP High Limit’ and ‘SP Low Limit’, for thelocal setpoints and instrument range high and low for other setpoint sources.Note: All setpoints are limited by ‘Range High’ and ‘Range Low’ so that if ‘SP High Limit’, for example,is set higher than ‘Range High’, then ‘SP High Limit’ is ignored and the setpoint is limited at the‘Range High’ value.<strong>User</strong> configurable methods for tracking are available, such that the transfers between setpoints and betweenoperating modes do not cause ‘bumps’ in the setpoint.Appendix BPage 316HA030554Issue 7 Nov 12
nanodac RECORDER/CONTROLLER: USER GUIDEB2.5.1 Setpoint function block (Cont.)Figure B2.5.1, below, shows the function block schematic.Programmer SPPSP High LimitProgSP2SP High LimitPSP Low LimitLocalSP Low LimitSP2 EnableSP1SP Low LimitSP High LimitSP1 EnableEnable Rem SPLocalRemoteRange maxRange minTarget SPTrim HighLocal SP + RemotetrimTrim LowRemote typeRemote SPRemote onlyLocal TrimRemote+ local trimOther inputs:PVRamp rateServoSp changedTarget SPRampRange maxRange minWorking SPRamp StatusFigure 2.5.1 Setpoint Function blockHA030554Issue 7 Nov 12Appendix BPage 317
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User Guide - Eurotherm Ltda

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