Position Scaling; Position Unit; Position Unit Scale; Position Recovery At Power-Up - Danfoss VLT AutomationDrive FC 302 Programming Manual

Parameter Descriptions
17-61 Feedback Signal Monitoring
Select which action the frequency converter should take if a
faulty encoder signal is detected. The encoder function in
parameter 17-61 Feedback Signal Monitoring is an electrical
check of the hardware circuit in the encoder system.
Option:
[5] Max Speed
[6] Switch to Open Loop
[7] Select Setup 1
[8] Select Setup 2
[9] Select Setup 3
[10] Select Setup 4
[11] Stop & Trip
[12] Trip/Warning
[13] Trip/Catch

3.17.5 17-7* Position Scaling

Parameters in this group define how the frequency
converter scales and handles the position values.

17-70 Position Unit

Select the physical unit for showing the position values on the
LCP.
Option: Function:
[0] pu Position unit.
*
[1] m Meters.
[2] mm Millimeters.
[3] inc Increments.
[4] ° Degrees.
[5] rad Radian.
[6] % Percent.
[7] qc Quad count, which is ¼ of an encoder pulse when
using quadrature encoder signal.

17-71 Position Unit Scale

Array [2]
Enter the scaling factor for the position values. The scaling
function multiplies the readout values by 10
value of this parameter. For example, if x = 2, the value 5 is
shown as 500.
The elements of the array are:
•
Index 0 is the scaling factor for readout and settings of
position values in parameters or in a fieldbus. Index 1
contains exceptions.
•
Index 1 is the scaling factor for readout of position error
(parameter 16-08 Position Error) and for the value of
parameter 3-08 On Target Window.
Range:
0 [-3 - 3 ]
*
MG33MP02
Programming Guide
17-72 Position Unit Numerator
This parameter is the numerator in the equation which defines
the relation between 1 motor revolution and physical movement
of machine.
Position unit =
Function:
Example:
Consider a turn table application. The motor makes 10
revolutions when the table makes 1 revolution. The position unit
is a degree. For this set-up, enter the following values:
Set the physical unit for position values in
parameter 17-70 Position Unit.
Range:
1024
17-73 Position Unit Denominator
See parameter 17-72 Position Unit Numerator.
Range:
1
17-74 Position Offset
Enter the absolute encoder position offset. Use this parameter to
adjust the 0 position of the encoder without physically moving
the encoder.
Set the physical unit for position values in
parameter 17-70 Position Unit.
Range:
0

17-75 Position Recovery at Power-up

Option: Function:
x
, where x is the
[0]
[1]
17-76 Position Axis Mode
Option:
Function:
Danfoss A/S © 10/2018 All rights reserved.
Par . 17 − 72
× Motor revolutions
Par . 17 − 73
•
Parameter 17-72 Position Unit Numerator = 360
•
Parameter 17-73 Position Unit Denominator = 10
[-2147483648 -
*
2147483647 ]
[-2147483648 - 2147483647 ]
*
[-2147483648 -
*
2147483647 ]
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.
Off The actual position is 0 after power-up.
*
On 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.
3
Function:
Function:
Function:
219
3