Rockwell Automation 20D PowerFlex 700H and 700S Frame 9...14 Drives - Manual (Page 42)

42 Rockwell Automation Publication PFLEX-IN006E-EN-P - July 2013
Chapter 2 Control Wiring for PowerFlex 700H Drives
PLC = Auto, Terminal Block = Manual
A process is run by a PLC when in Auto mode and requires manual control from
an analog potentiometer wired to the drive terminal block. The auto speed
reference is issued by the PLC through a communications module installed in the
drive. Since the internal communications is designated as Port 5, [Speed Ref A
Sel] is set to “DPI Port 5” with the drive running from the Auto source. Since the
Manual speed reference is issued by an analog input (“Analog In 1” or “Analog In
2”), parameter 96 [TB Man Ref Sel] is set to the same input. To switch between
Auto and Manual, parameter 364 [Digital In4 Sel] is set to 18 “Auto/ Manual”.
Attain Manual Control
• Close the digital input.
With the input closed, the speed command comes from the pot.
Release to Auto Control
• Open the digital input.
With the input open, the speed command returns to the PLC.
PLC = Auto, Terminal Block = Manual (HIM Control)
Note: This feature is only available for the 20-HIM-A3 / -A4-C3S / -C5S, Series
B and PowerFlex 700H firmware v5.004 or higher.
This version of firmware allows you to configure the drive to switch smoothly
from a communicated speed reference to local 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 pre-loads the last value from the communicated reference into the
HIM. Then you can then modify the manual reference on the HIM. This avoids
a step change in speed that would otherwise occur from the switch.
Example:
• Use a communications adapter (like a 20-COMM-C or 20-COMM-E) in
DPI port 5 for the primary - automatic speed reference.
• Use the on-board HIM in DPI port 1 for the secondary - manual speed
reference.
Wire digital input 4 to switch between automatic and manual references (high
for manual, low for automatic).
Make the following parameter selections:
• 90 [Speed Ref A Sel] = 22 “DPI Port 5”
• 96 [TB Man Ref Sel] = 18 “DPI Port 1”
• 193 [Man Ref Preload] = 1 “Enabled”
• 364 [Digital In4 Sel] = 18 “Auto/Manual”