IKA IC control Operating Instructions Manual

Also see for HBC 10 control: Operating instructions

IKA IC control Operating Instructions Manual Manual pdf 18 page image

18• Menu (Details):TEMPERING:1� Control:1) Control Mode:Internal (int):The temperature is regulated according to the internaltemperature sensor (Fig� 2 Item 6)�Extern (ext):The temperature is regulated according to the externaltemperature sensor (Fig� 2 Item 11)�2) Control parameters:Automatic:The optimal control parameters for PID temperature con-trol are determined automatically� This is the recommend-ed mode�Selecting "Automatic" allows you to set the dynamics fortemperature control:Accurate: precise tempering without overshooting�Fast: fast tempering with minimal overshooting�Manual:The control parameters for PID temperature control can beset manually�"Manual" should only be used in the event of special tem-perature control requirements�When "Manual" is selected, the following parameters can beset for "Internal (int)" and "External (ext)" temperature control:Kp: Proportional coefficientThe proportional coefficient Kp is the controller amplifica-tion and determines how strongly the control deviation(the difference between the target temperature and actualtemperature) directly affects the control variable (on-timeof the heater)� Kp-values that are too large can lead to thecontroller overshooting�Ti: Integral timeThe integral time Ti (s) is the correction time and deter-mines how strongly the duration of the control deviationaffects the control variable� Ti compensates for an existingcontrol deviation� A high Ti means a smaller and slowereffect on the control variable� Ti-values that are too smallcan lead to instability of the controller�Td: Differential timeThe differential time Td (s) is the derivative time and de-termines how strongly the rate of change of the controldeviation affects the control variable� Td compensates forrapid control deviations� A high Td means a smaller andslower effect on the control variable� Td-values that aretoo large can lead to instability of the controller�°CtFig. 26 (heating curve in "Automatic" mode)Ts: Sampling timeThe sampling time Ts (s) is the time interval over which thecontrol deviation is determined and the respective controlvariable (dependent on Kp, Ti and Td) is calculated�Ts must be adjusted to match the response characteristic(total of all time constants) of the closed loop controlledsystem, so that the control variable can deliver a uniformand measurable change in the control deviation� Ts valuesthat are too small or too large can lead to instability of thecontroller�Prop_Bp: Proportional Band Maximum�Prop_Bn: Proportional Band Minimum�The Proportional Band is the range below (Prop_Bp) andabove (Prop_Bn) the set value in which the control outputvalue is calculated via the difference between the actualand the set value and the PID parameters�Examples of non-optimal settings:3) Fluids:Under the option "Fluids", a variety of heat transfer fluidscan be selected�The selected fluid limits the setting range of the targettemperature� See table in the section “Fluids“�The maximum and minimum temperature values of the se-lected fluid can be set within these limitations�Fig. 27°CtKp too high°CtTi too low°CtTd too high°CtKp too lowTi too high