Rockwell Automation Allen-Bradley PowerFlex 520 Series, Руководство пользователя, Страница: 232 / 272

232 Rockwell Automation Publication 520-UM001K-EN-E - August 2021
Appendix F PID Set Up
Analog PID Reference
Signals
Parameters t091 [Anlg In 0-10V Lo] and t092 [Anlg In 0-10V Hi] are used to
scale or invert an analog PID Reference or PID Feedback.
Scale Function
For a 0...5V signal, the following parameter settings are used so that a 0V
signal = 0% PID Reference and a 5V signal = 100% PID Reference.
• t091 [Anlg In 0-10V Lo] = 0.0%
• t092 [Anlg In 0-10V Hi] = 50.0%
• A459 [PID 1 Ref Sel] = 5 “0-10V Input”
Invert Function
For a 4…20 mA signal, the following parameter settings are used so that a 20
mA signal = 0% PID Reference and a 4 mA signal = 100% PID Reference.
• t095 [Anlg In4-20mA Lo] = 100.0%
• t096 [Anlg In4-20mA Hi] = 0.0%
• A459 [PID 1 Ref Sel] = 6 “4-20mA Input”
PID Deadband
Parameters A465 and A477 [PID x Deadband] are used to set a range, in
percent, of the PID Reference that the drive will ignore.
Example
• A465 [PID 1 Deadband] = 5.0%
• The PID Reference is 25.0%
• The PID Regulator will not act on a PID Error that falls between 20.0 and
30.0%
0 10 20 30 40 50 60 70 80 90 100
PID Reference (%)
Input V
olts
2
4
6
8
10
12
0 10 20 30 40 50 60 70 80 90 100
PID Reference (%)
4-20 mA Input
4
8
12
16
20
24