Auto/Manual Examples - Allen-Bradley PowerFlex 70 User Manual

1-16 Installation/Wiring

Auto/Manual Examples

PLC = Auto, HIM = Manual
A process is run by a PLC when in Auto mode and requires manual
control from the HIM during set-up. 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.
Attain Manual Control
• Press ALT then Auto / Man on the HIM.
When the HIM gains manual control, the drive speed command
comes from the speed control keys or analog potentiometer on the
HIM.
Release to Auto Control
• Press ALT then Auto / Man on the HIM again.
When the HIM releases manual control, the drive speed command
returns to the PLC.
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 2"), [TB
Man Ref Sel] is set to the same input.
To switch between Auto and Manual, [Digital In4 Sel] is set to "Auto/
Manual"
Attain Manual Control
• Close the digital input.
With the input closed, the speed command comes from the
potentiometer.