ACS ACD Manual
Also see for SCD: Operation and instruction manual
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Contents
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Compressed Air Dryer Chapter 2: Functional Description 14 of 31MANU Manual Mode Lights when the auto/manual mode is set to manualmode.(Key) Lights when the setting change protect is ON.Understanding the Controller’s ParametersSet-upLevelParameter FunctionOperation Run/Stop (r-S)Can be set to “RUN” or “STOP.” When “RUN” is selected,the control is running. When “STOP” is selected, the controlis stopped, and the Stop indicator lights. The default value is“RUN.”Alarm Value (AL-1)Can be set from –1999 to 9999. This parameter is used toindicate how many degrees the process temperature will beallowed to exceed the set point temperature. An alarm outputwill de-energize the heaters. The default value is 25.AdjustmentAuto-tune (At)Can be set to “ON” or “OFF.” This feature is used toautomatically set the optimum PID parameters “proportionalband,” “integral time” and “derivative time” for the set pointvalue by changing the variables that had been modifiedpreviously. The default value is “OFF.”Temperature InputShift (Tns)Can be set from –199.9 to 999.9. This setting is used to offsetan error between the set point and the actual temperature. Theentire input range is shifted by a set figure preprogrammed bythe operator. The default value is 0.Proportional Band(P)Can be set from 0.1 to 999.9. This setting controls the amountin which the manipulated variable (MV) is proportionate tothe deviated value or controller error. The default value is 8.0.Integral Time (I)Can be set from 0 to 3999. Setting this feature gives thecontrol an action that is proportionate to the time integral ofthe control error. By using this setting, proportional action isused in combination with integral action to offset the controlerror and the set point will begin to match the controltemperature (PV or process value). The default value is 233.Derivative Time (d)Can be set from 0 to 3999. Setting the derivative controlprovides the controller with the ability to correct for a futureerror in the previously set process output. The default value is40. |
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