Goodrive350A series high-performance multifunction VFD
Basic operation guidelines
-114-
Function code
Name
Description
Default
Multi-step speed 13
-300.0
–300.0%
0.0%
Running time of step 13
0.0
–6553.5s (min)
0.0s
Multi-step speed 14
-300.0
–300.0%
0.0%
Running time of step 14
0.0
–6553.5s (min)
0.0s
Multi-step speed 15
-300.0
–300.0%
0.0%
Running time of step 15
0.0
–6553.5s (min)
0.0s
ACC/DEC time of steps 0
–7
of simple PLC
0x0000
–0xFFFF
0x0000
ACC/DEC time of steps 8
–15
of simple PLC
0x0000
–0xFFFF
0x0000
Simple PLC and present
stage number of multi-step
speed
Displays the present stage of
the simple PLC function.
0
5.5.15 PID control
PID control, a common mode for process control, is mainly used to adjust the VFD output frequency
or output voltage through performing scale-division, integral and differential operations on the
difference between feedback signal of controlled variables and signal of the target, thus forming a
negative feedback system to keep the controlled variables above the target. It is suitable for flow
control, pressure control, temperature control, etc. Diagram of basic principles for output frequency
regulation is shown in the figure below.
+
-
Reference-
feedback<P09.08
?
P09.10
(lower limit value of PID
output)
P09.09
(
upper limit value of PID
output
)
0
1
P09.03
(PID output characteristics)
PID output
P17.00
P17.23
P09.08 (Limit of PID control deviation)
P09.02
(PID feedback source)
P09.00
(PID reference source)
P17.24
PID feedback
value
PID reference value
Set frequency
0
1
2
3
4
5
6
7
8
9
Keypad
AI1
PROFIBUS/CANopen/DeviceNet
Modbus/Modbus TCP
Multi-step speed
HDIA
AI3
AI2
Ethernet
HDIB
0
1
2
3
4
5
6
7
AI1
PROFIBUS/CANopen/DeviceNet
Modbus/Modbus TCP
HDIA
AI3
AI2
Ethernet
Y
N
PID stops
adjustment
PID digital setting
Keep current frequency
Terminal function 25
PID control pause
Valid
Invalid
Kp P09.04 (proportional gain)
Ti P09.05 (integral time)
Td P09.06 (differential time)
P09.01
EtherCAT/PROFINET/EtherNet IP
Programmable card
10
11
HDIB
EtherCAT/PROFINET/EtherNet IP
Programmable card
8
9
Introduction to the working principles and control methods for PID control
Proportional control (Kp): When the feedback is different from the reference, the output will be