Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 126)

126 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 2 Feedback and I/O
DI PID Hold
If this input function is closed, the integrator for the Process PID loop is held at
the current value. If this input function is open, the integrator for the Process
PID loop is allowed to increase.
DI PID Reset
If this input function is closed, the integrator for the Process PI loop is reset to 0.
If this input function is open, the integrator for the Process PI loop integrates
normally.
DI PID Invert
If this input function is closed, the PI Error is inverted. If this input function is
open, the PI Error is not inverted.
DI Torque StptA
This digital input function is used to force P676 [Trq Ref A Stpt] as the source
for Torque Reference A, regardless of the setting in P675 [Trq Ref A Sel]. Used
when the drive is in a mode that is commanding torque. Refer to P309
[SpdTrqPsn Mode A], P310 [SpdTrqPsn Mode B], P311 [SpdTrqPsn Mode C],
and P312 [SpdTrqPsn Mode D].
DI Fwd End Limit, DI Rev End Limit
These digital input functions are used to trigger a Forward End Limit and/or a
Reverse End Limit. The resulting action depends on whether the drive is
operating as a speed, torque or position regulator. The mode of operation is
indicated by P935 [Drive Status 1] Bit 21 “Speed Mode,” Bit 22 “PositionMode,”
and Bit 23 “Torque Mode.” When the drive is operating as a speed regulator, the
resulting action is to execute a “Fast Stop” command. After the drive stops in this
case, it only restarts in the opposite direction (if given a new start command).
This function is usually used with a limit switch near the point where the drive
needs to stop. When the drive is operating as a torque regulator, the resulting
action is to execute a “Fast Stop” command. After the drive stops in this case, it
restarts and continues operation (if given a new start command). When the drive
is operating as a position regulator, the resulting action is to execute a “Fast Stop”
command. After the drive stops in this case, it restarts and continues to move
towards the position reference (if given a new start command).
DI Fwd Dec Limit, DI Rev Dec Limi t
These digital input functions are used to trigger a Forward Decel Limit and/or a
Reverse Decel Limit. The resulting action depends on whether the drive is
operating as a speed, torque or position regulator. The mode of operation is
indicated by P935 [Drive Status 1] Bit 21 “Speed Mode,” Bit 22 “PositionMode”
and Bit 23 “Torque Mode.” When the drive is operating as a speed regulator, the
resulting action is to override the speed reference and decelerate to Preset Speed
1. This function is usually used with a limit switch and initiates the slowing down
process prior to encountering the End Limit. When the drive is operating as a
torque regulator, the drive ignores this signal and continues operating at its
torque reference. When the drive is operating as a position regulator, the drive
ignores this signal and continues moving towards its position reference.