Rockwell Automation Allen-Bradley LiquiFlo 2.0, User Manual, Page: 151 / 268

Rockwell Automation Publication D2-3518-4 - January 2020 151
Parameter Descriptions Chapter 9
If the input is open, then Bus Reg Mode A selects which bus regulation mode to
use. If the input is closed, then Bus Reg Mode B selects which bus regulation
mode to use. If this input function is not configured, then Bus Reg Mode A
selects which bus regulation mode to use.
15...17 = Speed Select 1, 2, 3: One, two, or three digital input functions can be
used to select the speed reference used by the drive, and they are called the Speed
Select input functions. The current open/closed state of all Speed Select input
functions combine to select which source is the current speed reference.
There are seven possible combinations of open/closed states for the three input
functions, and thus seven possible parameters can be selected. The seven
parameters are: Speed Ref A Sel and Preset Speed 2 through Preset Speed 7.
If the Speed Select input functions select Speed Ref A Sel, then the value of that
parameter further selects a reference source. There are a large number of possible
selections, including all six presets.
If the input functions directly select one of the preset speed parameters, then the
parameter contains a frequency that is to be used as the reference.
The Speed Select input function configuration process involves assigning the
functionality of the three possible Speed Select input functions to physical digital
inputs. The three Speed Select inputs functions are called Speed Select 1, Speed
Select 2, and Speed Select 3, and they are assigned to physical inputs using the
Digital In“x”
Sel parameters.
Table 12 describes the various reference sources that can be selected using all
three of the Speed Select input functions. If any of the three Reference Select
input functions are not configured, the software still follows the table, but treats
the unconfigured inputs as if they are permanently open.
Table 12 - Effect of Speed Select Input State on Selected Reference
18 = Auto/Manual: The Auto/Manual function allows a single control device to
assume exclusive control of reference select. The most recent peripheral (OIM or
terminal block) that makes a manual reference request is given control of the
reference.
Speed
Select 3 Speed
Select 2 Speed
Select 1 Parameter that determines reference:
Open Open Open Speed Ref A Sel
Open Open Closed Speed Ref B Sel
Open Closed Open Preset Speed 2
Open Closed Closed Preset Speed 3
Closed Open Open Preset Speed 4
Closed Open Closed Preset Speed 5
Closed Closed Open Preset Speed 6
Closed Closed Closed Preset Speed 7