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Basic Drive Functions 9-23
ECODRIVE03 SGP-01VRS
Note:
When computing multiplication always use the next lower
binary value of the precise results.
Drive internal representation of position data when an
optional encoder is present
If an optional encoder is
mounted, the multiplication of
the motor encoder is guided by
the optional encoder
If there is an optional measuring system, then the multiplication of this
encoder is computed as per the above formula in terms of the travel
range set. The multiplication of the motor encoder is calculated so that it
also covers this travel range. This means that values exceeding 32768
can be generated depending on the mechanical transformation elements!
Example:
MKD motor with rotary optional encoder
motor encoder resolution
=4
optional encoder resolution
= 1000
travel range
= 50 revolutions
gear ratio
= 1:1
1. Calculating the multiplication of the optional encoder:
2^31 / (1000 • 50) = 42949, technical maximum 32768, thus
S-0-0257 = 32768.
This results in a resolution of 0.00001098 Degrees.
2. Calculating the multiplication of the motor encoder
2^31 / (4 • 50) = 10737418, the next smaller binary value = 8388608,
thus S-0-0256 = 8388608. However, the technical maximum resolution is
4194304. Therefore, we set the value in S-0-0256 to 4194304. The
resolution is 0.0002146 Degrees.
The resolution can never exceed 4194304 • S-0-0116!
Example:
MHD motor with linear optional encoder
Resolution of the motor encoder
= 256
Resolution of the optional encoder
= 0.02 mm
Travel range
=5m
feed constant
= 10 mm
Gear transmission ratio
= 3:1
1. Calculating the multiplication of the optional encoder :
2^31 • 0.02mm / 5000mm = 8589
Technically reasonable is a maximum of 8192, therefore
S-0-0257 = 8192. This gives a resolution of 0.00244 µm.
2. Calculation of the Multiplication of the motor encoder:
5m of travel range give 500 gear output revolutions and therefore 1500
gear input revolutions (motor revolutions).
2^31 / (256 • 1500) = 5592, the nearest smaller binary value = 4096,
therefore S-0-0256 = 4096.
This results in a resolution of 0.000343 Degrees referred to the motor
shaft.
DOK-ECODR3-SGP-01VRS**-FKB1-EN-P