Rockwell Automation MD65 User Manual Version 2.0 - Manual (Page 173)

PID Set Up I-5
Invert Function
For a 4-20mA signal, the following parameter settings are used so
that a 20mA signal = 0% PID Reference and a 4mA signal = 100%
PID Reference.
• Angl ln 4-20mA Lo (A112) = 100.0%
• Anlg In 4-20mA Hi (A113) = 0.0%
• PID Ref Sel (A132) = 3 “4-20mA Input”
PID Deadband
Parameter A138 [PID Deadband] is used to set a range, in percent,
of the PID Reference that the drive will ignore.
Example
• [PID Deadband] is set to 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 (%)
4-20mA
Input
4
8
12
16
20
24