Rockwell Automation Publication 20B-IN019E-EN-P - July 2013
61
PowerFlex 700 Adjustable Frequency AC Drive – Frames 0…6
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 In3 Sel] is set to “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, with speed reference from the HIM
A process is run by a PLC when in Auto mode and requires manual control from
the terminal block with the speed reference provided by the HIM.
The auto speed reference is produced by the PLC and transmitted to the drive
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.
When Manual mode is requested through the terminal block digital input, the
drive evaluates if Manual mode can be granted.
If [TB Man Ref Sel], parameter 96 is set to a DPI Port and [Man Ref Preload],
parameter 193 is enabled, the drive transfers the last value of the automatic speed
reference to the HIM. The HIM is now the speed reference source. The terminal
block has exclusive control based on [Save HIM Ref ], parameter 192, bit 1
(Manual Mode).
If [TB Man Ref Sel] is set to a DPI Port and [Man Ref Preload] is disabled, the
HIM is now the speed reference source. The terminal block has exclusive control
based on [Save HIM Ref ], bit 1 (Manual Mode).
If [TB Man Ref Sel] is set to one of the DPI Ports, a HIM must be connected on
the DPI Port selected.
IMPORTANT
Requires drive firmware v7.001 or greater and a Series B HIM with firmware
v5.004 or greater.
IMPORTANT
The HIM does not enter Manual mode, it is only the reference source for the
terminal block.