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SSI700 User Manual Description of Function Codes
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Property
Default Setting Range Parameter Name
Function
Code
Group 9: Fault and Protection
☆
0
0: Disabled
1: Enabled Protection upon load
becoming 0
P9-63
☆ 10.0%
0.0%–100.0% (rated motor
current) Detection level of load
becoming 0
P9-64
☆ 1.0s 0 0.0–60.0s
Detection time of load
becoming
P9-65
If protection upon load becoming 0 is enabled, when the output current of the AC drive is
lower than the detection level (P9-64) and the lasting time exceeds the detection time
(P9-65), the output frequency of the AC drive automatically declines to 7% of the rated
frequency. During the protection, the AC drive automatically accelerates to the set
frequency if the load resumes to normal.
Group 10: Process Control PID Function
PID control is a general process control method. By performing proportional, integral and
differential operations on the difference between the feedback signal and the target signal,
it adjusts the output frequency and constitutes a feedback system to stabilize the
controlled counter around the target value.
It is applied to process control such as flow control, pressure control and temperature
control. The following figure shows the principle block diagram of PID control.
Figure 6-27 Principle block diagram of PID control
Property
Default Setting Range Parameter Name
Function
Code
Group 10: Process Control PID Function
☆ 0
0: 10-01
1: AI1
2: AI2
3: Reserved
4: Pulse setting (DI5)
5: Communication setting
6: Multi-reference
PID setting source 10-00
☆
50.0% 0.0%–100.0% PID digital setting 10-01
10-00 is used to select the channel of target process PID setting. The PID setting is a
relative value and ranges from 0.0% to 100.0%. The PID feedback is also a relative value.
The purpose of PID control is to make the PID setting and PID feedback equal.