Danfoss VLT AutomationDrive FC 301 Programming Manual page 186

Parameter Descriptions
17-91 Relative Position Mode
Select which reference to use for relative positioning commands.
Option:
3 3
[3] Actual Position
17-92 Position Control Selection
This parameter allows to select the position control mode
without using a digital input signal or a fieldbus bit.
Option:
[0] No operation
*
[1] Relativ Position
[2] Enable
Reference
184
®
VLT AutomationDrive FC 301/302
Function:
The new target is calculated with the
formula: New target = commanded
position + position reference.
The frequency converter uses the actual
position as reference for the new
positioning command. The frequency
converter executes the new positioning
command immediately without
completing the previous positioning.
The new target is calculated with the
formula: New target = actual position +
position reference.
Function:
Use a digital input signal or a fieldbus bit
to activate the enable reference mode
and the relative position mode.
This option selects the relative position
mode permanently. All positioning
commands are considered to be relative.
Toggling option [113] Enable Reference on
a digital input or the enable reference
fieldbus bit triggers relative positioning.
This option selects the enable reference
mode permanently. Any new position
reference triggers an absolute positioning
command with the selected position
reference as target. This option cannot be
used with relative positioning.
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