H134-E1-01A E5_N UsersManual (986777), страница 12
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PID constants are set in the “proportional band” (P),“integral time” (I), and “derivative time” (D) parameters in the adjustment level.This procedure executes self-tuning (ST).Input type1. Press the O key for at least three seconds to move from the operationlevel to the initial setting level.stST2. Select the “ST” parameter by pressing the M key.25STInitial Setting Levelin-t53.
Press the U key to select on. ON is the default.onC4. To return to the operation level, press the O key. The temperature displayflashes during self-tuning (ST) execution.100Startup ConditionsNoteSelf-tuning by step response tuning (SRT) is started when the following conditions are met after program execution is started and the set point is changed.At start of operationWhen set point is changed1. The set point at the start of operationdiffers from the set point when the previous SRT was executed. (See note 1.)2. The difference between the temperature at the start of operation and the setpoint is greater both of the following:(Present proportional band × 1.27 +4°C) and the ST stable range.3. The temperature at the start of operation is lower than the set point duringreverse operation, and is larger thanthe set point during direct operation.4. There is no reset from input errors.1.
The new set point differs from the setpoint used when the previous SRT wasexecuted. (See note 1.)2. The set point change width is greaterboth of the following: (Present proportional band × 1.27 + 4°C) and the STstable range.3. During reverse operation, the new setpoint is larger than the set point beforethe change; and during direct operation, the new set point is smaller thanthe set point before the change.4. The temperature is stable.
(See note2.) (Equilibrium with the output amountat 0% when the power is turned ON isalso all right.) (See note 3.)(1) The previous SRT-implemented set point is the set point that was used forcalculating the PID constants for the previous SRT.(2) In this state, the measurement point is within the ST stable range.(3) In this state, the change width of the PV every 60 seconds is within theST stable range or less.In the following instances, PID constants are not changed by self-tuning (ST)for the present set point.1,2,3...1.
When the PID constants have been changed manually with ST set to ON.2. When auto-tuning (AT) has been executed.ST Stable RangeOperating ProcedureThe ST stable range determines the condition under which ST (self-tuning)functions.47Section 3-8Determining PID Constants (AT, ST, Manual Setup)This procedure sets the ST stable range to 20°C.Advanced Function Setting LevelCST stablest-b range1. Select the “ST stable range” parameter by pressing the M key in the advanced function setting level.1%0C2. Use the U key to set the parameter to 20°C.st-b2*03-8-3RT (Robust Tuning)• When AT or ST is executed with RT selected, PID constants are automatically set that make it hard for control performance to degenerate evenwhen control object characteristics are changed.rt• RT can be set in the advanced function setting level when PID control hasbeen set.• The RT mode cannot be selected while an analog input is set.• Selecting the RT mode in the following cases will help to prevent huntingfrom occurring.• When the set temperature is not fixed and is changed in a wide range• When there are large variations in ambient temperatures due to factorssuch as seasonal changes or differences between day and night temperatures• When there are large variations in ambient wind conditions and air flow• When heater characteristics change depending on the temperature• When an actuator with disproportional I/O, such as a phase-controltype power regulator, is used• When a rapidly heating heater is used• When the control object or sensor has much loss time• When hunting occurs in normal mode for any reason• PID constants are initialized to the factory settings by switching to RTmode.• When the RT mode is selected, the derivative time setting unit becomes the second.RT Features• Even when hunting occurs for PID constants when AT or ST is executedin normal mode, it is less likely to occur when AT or ST is executed in RTmode.TemperatureTemperatureMuch hunting occurs.Set valueStart of control48Hunting is reduced.Set valueTimeStart of controlTimeSection 3-8Determining PID Constants (AT, ST, Manual Setup)• When the temperature (PV) falls short of the set point for the PID constants when using AT or ST in normal mode, executing AT or ST in RTmode tends to improve performance.TemperatureTemperatureSet valueSet valueStart of controlTimeStart of controlTime• When the manipulated variable (MV) is saturated, the amount of overshooting may be somewhat higher in comparison to PID control based onAT or ST in normal mode.Operating ProcedureOperation LevelC25PV/SPThis procedure selects RT mode.1.
Press the O key for at least three seconds to move from the operationlevel to the initial setting level.100Initial Setting Levelin-tInput type2. Select the “move to advanced function setting level” parameter by pressing the M key.5Initial Setting Level3. Use the D key to enter “−169” (the password).Move to ad-functionamov vancedsetting level0Advanced Function Setting LevelParameterinit initializationIt is possible to move to the advanced function setting level by pressingthe M key or leaving the setting for at least two seconds.offAdvanced Function Setting Levelrt4.
Press the M key to select rt.RToff5. Press the U key to select on. off is the default.rton6. To return to the initial setting level, press the O key for at least one second.7. To return to the operation level, press the O key for at least one second.Operation LevelC25PV/SP10049Section 3-8Determining PID Constants (AT, ST, Manual Setup)3-8-4Manual SetupIndividual PID constants can be manually set in the “proportional band,” “integral time,” and “derivative time” parameters in the adjustment level.Operating ProcedureIn this example, the “proportional band” parameter is set to 10.0, the “integraltime” parameter to 250, and the “derivative time” parameter to 45.1. Press the O key to move from the operation level to the adjustment level.Adjustment LevelAdjustment levell.adj displayCpProportionalband2.
Press the M key to select the “proportional band” parameter.8.0C3. Use the U and D keys to set 10.0.p10.0iIntegral time4. Press the M key to select the “integral time” parameter.2335. Use the U and D keys to set 250.i250dDerivative time6. Select the “derivative time” operation by pressing the M key.407. Use the U and D keys to set 45.d458. To return to the operation level, press the O key.NoteProportional ActionWhen PID constants I (integral time) and D (derivative time) are set to 0, control is executed according to proportional action. As the default, the centervalue of the proportional band becomes the set point.Related parameter: Manual reset value (adjustment level)When P (Proportional Band) Is AdjustedIncreasedSetvalueThe curve rises gradually, and a longstabilization time is created, but overshooting is prevented.SetvalueOvershooting and hunting occur, butthe set value is quickly reached and thetemperature stabilizes.Decreased50Section 3-9Alarm OutputsWhen I (Integral Time) Is AdjustedIncreasedDecreasedIt takes a long time to reach the setpoint.It takes time to achieve a stable state,but overshooting, undershooting, andhunting are reduced.SetvalueOvershooting and undershooting occur.Hunting occurs.The Controller starts up faster.SetvalueWhen D (Derivative Time) Is AdjustedIncreasedDecreased3-9Overshooting, undershooting, and stabilization times are reduced, but finehunting occurs on changes in the curveitself.Overshooting and undershootingincrease, and it takes time to return tothe set point.SetvalueSetvalueAlarm Outputs• Alarms can be used by the E5CN-@2@@@ (2 alarm points), E5AN/EN@1@@@ (1 alarm point), E5AN/EN-@3@@@ (3 alarm points), the E5CN@1@@@U (1 alarm point), or the E5CN-@2@@@U (2 alarm points).Alarm outputs are determined by a combination of “alarm type,” “alarmvalue,” and “alarm hysteresis” alarm output conditions.
For details, refer to4-2 Alarm Hysteresis.• This section describes the “alarm type,” “alarm value,” “upper-limit alarm”and “lower-limit alarm” parameters.3-9-1Alarm TypesSet value01Alarm typeAlarm function OFFUpper- and lower-limit2 (See note Upper-limit1.)3Lower-limitAlarm output operationWhen alarm value X When alarm value Xis positiveis negativeOutput OFFONOFFONOFFONOFF4 (See note Upper- and lower-limit1.)rangeONOFF5 (See note Upper- and lower-limit1.)with standby sequenceONOFFL HSee note 2.SPXSPXSPL HONOFFONOFFXSPXSPSee note 3.SPL HSee note 4.SPSee note 5.6Upper-limit with standbysequenceONOFFXSPONOFFXSP51Section 3-9Alarm OutputsSet valueAlarm type789Lower-limit with standbysequenceONOFFAbsolute-value upperlimitONOFFAbsolute-value lower-limit1012XXONOFF0XONOFF0XONOFFONOFF0XONOFFLBA (alarm 1 type only)ONOFFSPONOFFAbsolute-value upperlimit with standbysequenceAbsolute-value lower-limitwith standby sequence11NoteAlarm output operationWhen alarm value X When alarm value Xis positiveis negativeONOFF0XSPX0X0X0X0---(1) With set values 1, 4, and 5, the upper- and lower-limit values can be setindependently for each alarm type, and are expressed as “L” and “H.”(2) Set value: 1 (Upper- and lower-limit alarm)Case 1Case 2Case 3 (Always ON)H < 0, L < 0LH SPH < 0, L > 0|H| < |L|HSP L HH > 0, L < 0|H| > |L|HSPLH < 0, L > 0|H| ≥ |L|L SPSP HLH > 0, L < 0|H| ≤ |L|(3) Set value: 4 (Lower limit range)Case 2Case 1Case 3 (Always OFF)H < 0, L < 0LH SPH < 0, L > 0|H| < |L|SP LHHH > 0, L < 0|H| > |L|HSPLL SPSP H LH < 0, L > 0|H| ≥ |L|H > 0, L < 0|H| ≤ |L|(4) Set value: 5 (Upper- and lower-limit with standby sequence)• For the lower-limit alarms in cases 1 and 2 above, the alarm is alwaysOFF if upper- and lower-limit hysteresis overlaps.• In case 3, the alarm is always OFF.(5) Set value: 5 (Upper- and lower-limit with standby sequence)• The alarm is always OFF if upper- and lower-limit hysteresis overlaps.• Set the alarm type independently for each alarm in the “alarm 1 to 3 type”parameters in the initial setting level.
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