Error Correction Function Of Cdhd2S - Servotronix CDHD2S User Manual

Application Setup

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.
When using the error correction function in an incremental system,
Note:
homing is required.
When the CDHD2S error correction function is used in a dual control
loop system, the secondary (load) encoder value is corrected. When the
Note:
CDHD2S error correction function is used in a single control loop system,
the primary (motor) encoder value is corrected.
—167
—
Motor
measurement
Encoder position
0
100
200
300
400
500
Figure 6-44 Laser interferometer measuring travel distance
External
Corrected value
position
0
99
202 -2
300
400
500
0
1
0
0
0