7 Detailed Functions
7 - 46
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
• To use this function, set A071 to 01 (Enabled: Reverse output disabled) or 02 (Enabled: Reverse
output enabled).
• The PID function can be disabled during PID operation via external signal input. To use this function,
allocate one of the multi-function input terminals to 23 (PID: PID disabled). This causes the PID
function to be disabled while the PID terminal is ON and the inverter generates a normal output.
• Using PID control ensures the feedback value to match the set target value. Specifically, you can
install a flow-rate, air-volume, or pressure feedback sensor and control its feedback value to the
intended target value.
The basic configuration of a control system using the PID function is as shown in the block diagram
below.
(1) P Operation
In this operation, the control volume is proportional to the deviation (difference between the target value
and the current value).
C044
PID Deviation Excessive
Level
0.0 to 100.0 3.0
%C052
Feedback Comparison
Signal Off Level
0.0 to 100.0 100.0
C053
Feedback Comparison
Signal On Level
0.0 to 100.0 0.0
Related functions d004, A001, A005, A006, C001 to C008, C021 to C025
Basic Structure of PID Control
PID Operation
Parameter No. Function name Data Default data Unit
fs
M
=
+
–
Deviation
ε
sTd
sT
Kp
i
1
1
Target value
(A001)
0 to 10 V
4 to 20 mA
+
·
·
+
Control
volume
Disabled
0 to 10 V
4 to 20 mA
–10 to 10 V
Feedback 0 to 10 V
4 to 20 mA
Normal control
of the inverter
Transducer
Sensor
Kp: Proportional gain (A072: PID P gain) Ti: Integral time (A073: PID I gain)
Td: Derivative time (A074: PID D gain) s: Operator ε: Deviation
Feedforward
+
–
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