Rockwell Automation Liqui-Flo DBT Reach Drive - Manual (Page 222)

Appendix D-8 DBT Reach Drive User Manual
PI Enable
The output of the PI loop can be turned on (enabled) or turned off (disabled). This
control allows the user to determine when the PI loop is providing part or all of the
commanded speed. The logic for enabling the PI loop is shown below.
The drive must be running for the PI loop to be enabled. The loop will be disabled
when the drive is ramping to a stop (unless “Stop Mode” is configured in [PI
Configuration]), jogging or the signal loss protection for the analog input(s) is sensing
a loss of signal.
If a digital input has been configured to “PI Enable,” two events are required to enable
the loop: the digital input must be closed AND bit 0 of the PI Control parameter must
be = 1.
Figure D.10 – PI Loop Logic
Drive
Running
Drive
Ramping
to Stop
Drive
Jogging
Bit 0 of
[PI Control] = 1
(enabled)
[PI Configuration]
Signal Loss
The Configured
Digital Input
is Closed
A Digital Input
is Configured
to PI Enable
"Enabled" Status
Digital Input
is Reflected
in [PI Status]
Bit 0 = 1
The PI Loop
is Enabled
Bit 0 Bit 6