Rockwell Automation Liqui-Flo AC GP Vector Drive Version 6.4 - Manual (Page 126)

4-44 LiquiFlo AC Drive, Software Reference Version 6.4
P.054 Level Sense Start Enable (continued)
Figure 4.7 shows the start, stop, and running status of the drive when configured for
edge control versus level control.
Note that when operating from the terminal strip (rE) or a network option, an edge is
required at the start input for the following two conditions, even if P.054 = ON:
• The front panel keypad/display or OIM/CS3000 STOP key is pressed.
• After a vector self-tuning procedure.
These forced edge requirements do not apply if the control source is changed to any
other value and then back again as shown in the following example.
Figure 4.7 – Drive Start, Stop, and Running Status when Configured for Edge Control vs. Level Control
Example
Assume the selected control source is the terminal strip (P.000 = rE), level sense
start is enabled (P.054 = ON), no faults are active, and both the start and stop
inputs are closed. The drive, therefore, is running.
The drive is stopped using the front-panel STOP key. The drive now waits for an
open-to-close edge on the terminal strip start input to restart.
The control source is changed to any value other than rE. This is done by changing
P.000 to any value but rE or toggling the REM/LOC switch.
The control source is then changed back to the terminal strip (rE).
Since the start input is still closed, the drive starts. A start edge is no longer
required because switching from the terminal strip and back again effectively acts
as an edge.
START
STOP
RUNNING
Level-Sensitive Start
Edge-Sensitive Start
RUNNING
STOP
START