4-2 Function Mode •To use this function, set A071 to 01. •To switch between enable/disable through external signals, allocate 23 (PID enabled/disabled) to the desired multi-function input. Select OFF for "enabled" and ON for "disabled". 4 „ Feedback Selection •Select a terminal for feedback signals in A076. •The target value depends on the frequency reference selection A001 of the data not selected in A076. The setting of FV/FI selection A005 is disabled when the control terminal block (terminal) 01 is set in A001.
Functions „ Basic Structure of PID Control (Example) s T s T K d i p 1 1 Target value 0 to 10 V 4 to 20 mA + - Deviation ε + · · + Control volume fs M = Normal control of the Inverter Sensor Feedback 0 to 10 V 4 to 20 mA Transducer Kp : Proportional gain Ti : Integral time Td : Derivative time s : Operator ε : Deviation „ PID Operation P Operation •Operation where the control volume is proportional to the target value Target value Step transition Ramp transition Large Large A072 A072 Control volume Small Small I Operation •Operation where the control volume increases linearly according to time Target value Small Small Control volume Large A073 Large A073 4-19 Parameter No.
Function name Data Default setting Unit C044 PID deviation excessive level 0. to 100. 3.0 % C052 PID FB upper limit 0.0 to 100.0 100 % C053 PID FB lower limit 0.0 % Related functions d004, A001, A005, C001 to C006, C021 to C022, C026