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7 Detailed Functions
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
7-3 Basic Functions (Group A)
7
(2) I Operation
In this operation, the control volume is proportional to the time integral value of the deviation. The P
operation is less effective as the current value approaches the target value due to smaller deviation,
taking a long time to reach the target value. The I operation compensates this disadvantage.
(3) D Operation
In this operation, the control volume is proportional to the percentage of change in the deviation.
Because using only the PI operation is time-consuming, the D operation is used to effectively
compensate for the disadvantage in responsiveness.
The PI operation is the combination of the P and I operations; the PD operation is the combination the
P and D operations; the PID operation is the combination of the P, I, and D operations.
• Select the terminals used to input the feedback signal in PID Feedback Selection (A076).
• For the target value, the frequency reference selection method depends on the Frequency Reference
Selection (A001) setting. When A001 is set to 01 (Terminal), the FV/FI Selection (A005) setting is
disabled.
• When you select analog input terminals for the PID feedback function and set A001 to 01 (Terminal),
the PID target value is selected based on the value set in the FE Selection (A006) set value, as
shown in the following table.
• Be sure that the input terminal setting for the target value and that for the feedback signal do not
overlap.
• To use the PID feedback function via RS485 communications, transfer data as described below.
Feedback Selection and Target Value Setting
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 (Calculation
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
operands
FE (Reversible)
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