PowerFlex Digital DC Drive User Manual - Publication 20P-UM001C-EN-P - July 2008
C-14 Application Notes
Torque Reference Source
The torque reference can only be supplied by an analog input, the HIM, or a
network reference. Switching between available sources while the drive is
running is not available. Digital inputs programmed as “Speed Sel 1, 2, 3”
and the HIM Auto/Manual function (see above) do not affect the active
torque reference. The HIM, however, cannot acquire Manual Reference
control while it is configured to supply the torque reference.
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 speed reference is issued by the PLC
through a communications module installed in the drive (Port 5). Therefore,
parameter 1327 [DPI P5 Select] is set to “Speed Ref A” with the drive
running from the Auto source.
Acquire Manual Control
• Press ALT then Auto/Man on the HIM. When the HIM acquires manual
control, the drive speed command comes from the HIM speed control
keys.
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 (Port 5). Therefore, parameter 1327 [DPI P5 Select] is
set to “Speed Ref A” with the drive running from the Auto source. Since the
Manual speed reference is issued by analog input 2, parameter 75 [Anlg in2
Sel] is set to “TB Man Ref”. The value of analog input 2 can be viewed in
parameter 267 [TB Manual Ref]. To switch between Auto and Manual,
parameter 136 [Digital In4 Sel] is set to “Auto/ Manual”.
Acquire 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.
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