Servotronix CDHD2S - Error Correction Function of CDHD2 S

Application Setup
—167
—
Motor
Encoder position
External
measurement
position
Corrected value
0
0
0
100
99
1
200
202
-2
300
300
0
400
400
0
500
500
0
Figure 6-44 Laser interferometer measuring travel distance
6.17.3 Error correction function of CDHD2S
The CDHD2S error correction function can be applied in several motor system types:
⚫ Direct drive linear platform
⚫ Direct drive rotary platform
⚫ Linear platform driven by servo drive (motor rotates and the error is linear)
⚫ Rotary platform driven by servo motor (motor rotates and load rotates)
Error correction is available for all absolute and incremental encoders supported by CDHD2S.
Note:
When using the error correction function in an incremental system,
homing is required.
Note:
When the CDHD2S error correction function is used in a dual control
loop system, the secondary (load) encoder value is corrected. When the
CDHD2S error correction function is used in a single control loop system,
the primary (motor) encoder value is corrected.