4-37
1
Before Using the Products
2
Preparation
3
Connection
4
Setup
5
Adjustment
6
When in T
rouble
7
Supplement
Pr3.23
*
External scale selection
Range
Unit
Default
Related
control mode
0 to 6
—
0
P S T F
Select the type of external scale.
Setup
value
External scale type
Compatible scale
Compatible
speed
[0]
A,B phase output type
*
1
External scale of A, B phase output type
to 4 Mpps
(after quadrupled)
1
Serial communication type
(incremental version)
*
1
Magnescale Co., Ltd.
NIDEC Sankyo Corporation
to 4 Gpulse/s
2
Serial communication type
(absolute version)
*
1
Mitsutoyo Corporation
Magnescale Co., Ltd.
Heidenhein
Renishaw PLC
Fagor Automation S.Coop
to 4 Gpulse/s
3 to 6
For manufacturer use
—
—
*
1 Connect the external scale so that it increments the count as the motor shaft turns
positive direction, and decrements as the shaft turns negative direction. If this
connection arrangement is impossible due to installation condition, etc., use the count
reverse function of Pr3.26 Reversal of direction of external scale.
When the setup value is 1 or 2 while the A, B phase output type is connected, Err50.0
External scale wiring error protection occurs, and if the setup value is 0 while the serial
communication type is connected, Err55.0, 1 or 2 A phase, B phase or Z phase wiring error
protection will occur.
Pr3.24
*
Numerator of external scale division
Range
Unit
Default
Related
control mode
0 to 8388608
—
0
F
Set up the numerator of the external scale dividing setup.
When setup value = 0, encoder resolution is used as numerator of the division.
Pr3.25
*
Denominator of external scale division
Range
Unit
Default
Related
control mode
1 to 8388608
—
10000
F
Caution
• Check the number of encoder feedback pluses per one motor revolution and the number of
external scale pulses per one motor revolution, and then set up the numerator of external
scale division (Pr3.24) and the denominator of external scale division (Pr3.25) to establish
the expression shown below.
• With Pr3.24 set at 0, the encoder resolution is automatically used as numerator.
Example: When ball screw pitch is 10 mm, scale 0.1 μm/pulse, encoder resolution 23 bits
(8388608 pulses);
Encoder resolution per one motor revolution [pulse]
External scale resolution per one motor revolution [pulse]
=
Pr3.24 8388608
Pr3.25 100000
If this ratio is wrong, the difference between the position calculated based on the encoder
pulses and the position calculated based on the external scale pulses becomes large over a
long travel distance and will activate the excess hybrid deviation error protection.
1. Details of parameter
[Class 3] Velocity/ Torque/ Full-closed control
Default: [ ]
Caution
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