Danfoss VLT AutomationDrive FC 301 Programming Manual page 264

Parameter Descriptions
17-75 Position Recovery at Power-up
Option:
3 3
[0] Off
*
[1] On
17-76 Position Axis Mode
Option:
[0] Linear Axis
*
[1] Rotary 0 - Max Continuous motion, where the
[2] Rotary Min -
Max
262
®
VLT AutomationDrive FC 301/302
Function:
NOTICE
This parameter is only
available with software version
48.XX.
Select the actual position after
power-up when using open loop or
incremental encoders.
The actual position is 0 after power-
up.
The frequency converter stores the
actual position at power down and
uses it as the actual position when
powered up.
Function:
NOTICE
This parameter is only
available with software version
48.XX.
Select the axis type for position
counting.
The motion is within a position
range defined by
parameter 3-06 Minimum Position
and parameter 3-07 Maximum
Position.
position changes between 0 and
parameter 3-07 Maximum Position.
When passing the maximum
position, the reading restarts from
0.
NOTICE
This option is available only
with software version 48.20
and newer.
Continuous motion, where the
position changes between
parameter 3-06 Minimum Position
and parameter 3-07 Maximum
Position. When passing the
maximum position, the reading
restarts from the minimum position.
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17-77 Position Feedback Mode
Option: Function:
NOTICE
This parameter is only
available with software version
48.2X and newer.
Select the mode for handling
absolute encoders. Select [0]
Relative if the application requires
to track the position when the
position value exceeds the
measuring range of the encoder, for
example when using single turn
encoders for linear motion. Select
[1] Absolute if the position values
are always within the measuring
range of the encoder, for example
when using a laser distance
measuring device.
[0] Relative The actual position is set to the
*
absolute position read from the
encoder at power-up, and then the
frequency converter uses only the
position changes for calculating the
actual position. In this mode, the
actual position values are between
-2147483648 and 2147483647 even
when the values exceed the
measuring range of the encoder. To
save and use the absolute position
values outside the measuring range
of the encoder after power down,
set parameter 17-75 Position
Recovery at Power-up to [1] On. The
position value is accurate if the
encoder does not move by more
than half of the encoder measuring
range when the frequency
converter is powered down.
[1] Absolute The frequency converter uses the
absolute position from the encoder
as actual position continuously. In
this mode, the actual position
values are between 0 and the
maximum position of the encoder.
The maximum position is
determined by the number of bits,
for example, the SSI encoder has 25
bits and its maximum value is 2
33554432. Set
parameter 3-07 Maximum Position to
the maximum value of the encoder
scaled according to
parameter 7-94 Position PI Feedback
25 =
M0013101