4-2 Function Mode „ PID Operation P Operation •Operation where the control volume is proportional to the target value Step transition Ramp transition Target value Large Large A072 Control volume A072 Small Small I Operation •Operation where the control volume increases linearly according to time 4 Small Target value Small Functions Control volume Large A073 A073 Large D Operation •Operation where the control volume is proportional to the variation ratio of the target value Target value Large A074 Large A074 Control volume Small Small •PI operation is the combination of the above P and I operations; PD is P and D operations; PID is P, I and D operations.
„ Feedback Selection •Select a terminal used for feedback signals in PID feedback selection A076. •The target value depends on the terminal selected in frequency reference selection A001 other than that in A076. When A001 is set to "01" (terminal), the setting of AT selection A005 is disabled. •When analog input is selected for PID feedback and A001 is set to "01" (terminal), the PID target value is selected depending on the A006 set value, as shown in the following table. •To select RS485 for PID feedback, transfer data as described below.
4-32 PID feedback selection (A076) PID target value A006 = 00 A006 = 01 A006 = 02 A006 = 03 00 (FI-FC) FV + FE (Not reversible) FV + FE (Reversible) FV 01 (FV-FC) FI + FE (Not reversible) FI + FE (Reversible) FI 10 (operation result) FI included in operands FV + FE (Not reversible) FV + FE (Reversible) FV FV included in operands FI + FE (Not reversible) FI + FE (Reversible) FI FI and FV are the operands FE (Reversible)