Auto-Tuning PIDControllers

SERIES988/989

Enhanced Software Cascade Control Cascade control is a control strategyin which one control loop provides the set point for another loop. It allows the process or part temperature to be reached quickly while minimizing overshoot. Cascade is used to optimize the performance of thermal systems with long lag times.•Precise control via cascadeconfiguration•Display of both process variables •Low cost; one unit does the workof two•Increased operator productivitywith fast setup
Outer-Loop Thermocouple Ratio Control Whether mixing materials orcontrolling temperature indirectly, ratio control with the SERIES 988 provides automatic set pointadjustments in response to system changes.•Simplified process control; onecontroller does the work of two•Low cost solution; one controller,display access - both process variables•One controller for many applications •Easy setup; increased operatorproductivity
Input 1Input 2Output 1LimitLimit SensorOil InHeaterOil OutInner-LoopThermocouple W A TL TL W PROCESS L1L2L3L4 DEV% OUT DISPLAY MODEAUTOMAN Current monitor
SERIES 988 Current monitoring provides systemperformance and status information.The SERIES 988 accepts current transformer signal with no conditioning.•Easily accessible heater status•System performance data fortroubleshooting or design enhancements•System protection; fast shut downwith overcurrent•Easy setup: no external signalconditioner required
Lube Oil Tank W A TL TL W PROCESS 4-20mA Valve controller Output L1L2L3L4 DEV% OUT Material AControlled StreamMaterial BWild Stream DISPLAY AnalogInput 1AnalogInput 2 MODEAUTOMAN Material CMixed MaterialFlow SensorFlow Sensor SERIES 988 W A TL TL W Power Controller CurrentTransformer ControllerOutput CirculationHeater PROCESS L1L2L3L4 DEV% OUT DISPLAY AlarmOutput AnalogInput 2AnalogInput 1 MODEAUTOMAN SERIES 988 Current Monitor Thermocouple 40