Installation/Wiring 1-23
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 attains manual control, the drive speed command
comes from the HIM speed control keys or analog potentiometer.
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 pot.
Release to Auto Control
• Open the digital input.
With the input open, the speed command returns to the PLC.
Auto/Manual Notes
1. Manual control is exclusive. If a HIM or Terminal Block takes
manual control, no other device can take manual control until the
controlling device releases manual control.
2. If a HIM has manual control and power is removed from the drive,
the drive will return to Auto mode when power is reapplied.
Auto/Manual Examples
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