MPH-02, MPB-02, MPD-02
Motor, Mechanical Axis System, Measuring Systems
5-53
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
Note:
In the case of Rexroth housing motors (MHD, MKD, MKE,
2AD, ADF, MAD, MAF) and linear motors with EnDat encoder,
the correct value is automatically written to S-0-0116!
The analog encoder signals are converted to digital position data via A/D
converter. Thereby encoder resolution available at the axis is increased
compared with resolution of the measuring system (see above!).
motor encoder, rotary:
S-0-0116 * 2
15
external encoder, rotary:
S-0-0117 * 2
15
S-0-0116:
Feedback 1 resolution
S-0-0117:
Feedback 2 resolution
Fig. 5-67:
Maximum possible encoder resolution of rotary encoder
motor encoder, linear:
S-0-0116 / 2
15
external encoder, linear:
S-0-0117 / 2
15
S-0-0116:
Feedback 1 resolution
S-0-0117:
Feedback 2 resolution
Fig. 5-68:
Maximum possible encoder resolution of linear encoder
Note:
Depending on the type of motion of the encoder, the
"maximum encoder resolution after digitalization" is output in
different units:
•
rotary encoders: position information/encoder revolution
•
linear encoders: mm (length of the shortest measurable
distance)
Internally the value range of the encoder position data is
±
2
31
, i.e. the
encoder position range can be resolved to 2
32
data. By digitalization, a
multitude of position data results from one division period. By means of
adjusted multiplication, the range of encoder position data of
±
2
31
values,
referring to the travel range of the axis (S-0-0278), is complied with.
The resulting drive-internal encoder resolution is as follows:
motor encoder:
internal encoder resolution = S-0-0116 * S-0-0256
ext. encoder:
internal encoder resolution = S-0-0117 * S-0-0257
auxiliary calculation and drive-internal limitation:
S-0-0256 = 2
30
* c
achs_G1
/ (S-0-0116 * S-0-0278) <=2
n
, n<=15 (integral!)
S-0-0257 = 2
30
* c
achs_G2
/ (S-0-0117 * S-0-0278) <=2
n
, n<=15 (integral!)
S-0-0116:
Feedback 1 resolution
S-0-0256:
Multiplication 1 (motor encoder)
S-0-0117:
Feedback 2 resolution
S-0-0257:
Multiplication 2 (optional encoder)
S-0-0278:
Maximum travel range (
±
travel range)
c
achs_G1
:
axis motion range / motor encoder revolution
c
achs_G2
:
axis motion range / revolution of the external encoder
Fig. 5-69:
Internal encoder resolution for rotary encoders
Maximum Encoder Resolution
After Digitalization
Internal Encoder Resolution,
Rotary Encoders
Courtesy
of
CMA/Flodyne/Hydradyne
▪
Motion
Control
▪
Hydraulic
▪
Pneumatic
▪
Electrical
▪
Mechanical
▪
(800)
426-5480
▪
www.cmafh.com