Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 123)

Rockwell Automation Publication 750-RM002B-EN-P - September 2013 123
Feedback and I/O Chapter 2
open. The table below describes the actions taken by the drive in response to
various states of these input functions.
The drive will not jog while the drive is running or while the “Stop” input is open.
Start has precedence.
DI Jog 1, DI Jog 2
These digital input functions are similar to “Jog Forward” and “Jog Reverse” with
the only difference being that direction is determined by another input or
another device’s command (HIM or communication adapter). In addition, these
settings use either P556 [ Jog Speed 1] or P557 [ Jog Speed 2], respectively. In
Unipolar mode, the absolute value is used along with a separate direction
command. In Bipolar mode, the polarity of P556 [ Jog Speed 1] or P557 [ Jog
Speed 2] determines the direction of jog.
DI Manual Ctrl
The digital input function works in conjunction with the overall Auto/Manual
function. When this input is closed, it overrides other speed references, but only
if another device (HIM) did not have ownership of the Manual state. If the
digital input is successful in gaining manual control, the speed reference comes
from P563 [DI ManRef Sel], which can be set to any of the Analog Inputs, Preset
Speeds, MOP Reference, or an applicable Port Reference.
Associated with this digital input function, there is the ability to configure the
drive to switch smoothly from an automatic (communicated) speed reference to
manual speed reference produced by the Human Interface Module (HIM).
When the drive is commanded to switch from the automatic (communicated)
speed reference to the manual reference via a digital input, it preloads the last
value from the speed feedback into the HIM. Then the operator can modify the
manual reference on the HIM. This avoids a step change in speed that otherwise
occurs from the switch. Use this feature by configuring P328 [Alt Man Ref Sel],
P331 [Manual Preload], P172 [DI Manual Ctrl], and P563 [DI ManRef Sel].
This feature requires revision 2.001 of 20-HIM-A6 firmware or later.
DI Speed Sel 0, 1, and 2
These digital input functions can be used to select the speed reference. The open/
closed state of all the speed select digital input functions combine to select which
source is the speed reference.
Jog Forward Jog Reverse Action
Open Open Drive stops if already jogging, but can be started by other means. Terminal block
relinquishes direction ownership.
Open Closed Drive jogs in reverse direction. Terminal block takes direction ownership.
Closed Open Drive jogs in forward direction. Terminal block takes direction ownership.
Closed Closed Drive continues to jog in current direction, but terminal block maintains
direction ownership.