Rockwell Automation Allen-Bradley LiquiFlo 2.0 - Page 96

96 Rockwell Automation Publication D2-3518-4 - January 2020
Chapter 9 Parameter Descriptions
• Process trim, which takes the output of the PI regulator and sums it with a
master speed reference to control the process.
• Process control, which takes the output of the PI regulator as the speed
command. No master speed reference exists, and the PI output directly
controls the drive output.
Note that Speed Mode (80) must be set to Process PI (2).
Figure 41 - PI Control (125)
Bit 0 - PI Enable
• Enables/disables the operation of the PI loop.
Bit 1 - PI Hold
• Enabled = The integrator for the outer control loop is held at the
current level; that is, it will not increase.
• Enabled = The integrator for the outer PI control loop is allowed to
increase.
Bit 2 - PI Reset
• Enabled = The integrator for the outer PI control loop is reset to zero.
• Disabled = The integrator for the outer PI control loop integrates
normally.
00x0xxxxxxxxxxxx
0011234567891112131415
1 =Enabled
0=Disabled
x =Reserved
Bit #
Factory Default Bit Values
PI Enable
PI Hold
PI Reset
Nibble 1Nibble 2Nibble 3Nibble 4