Accuracy - Bosch Rexroth IndraDyn A Series Project Planning Manual

9-20
Application Notes

Accuracy

Absolute
There are two types of accuracy for rotary encoders: "absolute accuracy"
and "relative accuracy".
The absolute accuracy of rotary encoders is determined primarily by the
quality and precision of the encoder construction as well as by the
mechanical attachment to the motor.
The following values apply to IndraDyn A motors:
Encoder option
acc. to type
code
C0
M0
M2, M6
S0
S2, S6
Fig. 9-23: Absolute encoder precision
The relative accuracy of encoder systems is also referred to as
Relative
"repeatability". It is determined primarily by the interpolation variances
during further processing of the measured signals in the installed and in
the external interpolation and digitization electronics.
For 2AD motors, the following guidelines apply for operation with Rexroth
drive controllers (as of the publishing date of this documentation):
Encoder option
acc. to type
code
C0
M0
M2, M6
S0
S2, S6
Fig. 9-24: Relative encoder precision
Technical Data
Incremental encoder
sinus/cosine signal
1Vss with 2048 lines
Multiturn absolute encoder with I²C
interface.
Sinus/cosine signal
1Vss with 512 lines
Multiturn absolute encoder with EnDat2.1
interface. Sinus/cosine signal
1Vss with 2048 lines
Singleturn absolutel encoder with I²C
interface. Sinus/cosine signal
1Vss with 512 lines
Singleturn absolute encoder with EnDat2.1
interface. Sinus/cosine signal
1Vss with 2048 lines
Technical Data
Incremental encoder
sinus/cosine signal
1Vss with 2048 lines
Multiturn absolute encoder with I²C
interface.
Sinus/cosine signal
1Vss with 512 lines
Multiturn absolute encoder with EnDat2.1
interface. Sinus/cosine signal
1Vss with 2048 lines
Singleturn absolute encoder with I²C
interface. Sinus/cosine signal
1Vss with 512 lines
Singleturn absolute encoder with EnDat2.1
interface. Sinus/cosine signal
1Vss with 2048 lines
DOK-MOTOR*-MAD/MAF****-PR03-EN-P
Rexroth IndraDyn A
Absolute
accuracy
± 0,0056°
(± 20" )
± 0,0167°
(± 60" )
± 0,0056°
(± 20" )
± 0,0167°
(± 60" )
± 0,0056°
(± 20" )
Relative
accuracy
± 0,01'
± 0,005'
± 0,005'
± 0,001'
± 0,001'