Siemens SINUMERIK 840C Installation Instructions Manual page 242

09.95
The following parameters are used for adaption to the measuring system:
Parameter
Position control resolution
Multiplier for EXE
Grid constant
Spindle pitch
Measuring system resolution
Pulses per revolution
Transmission ratio of
mechanical gearing
Factor for position control
pulses
Factor for actual value
pulses
The relation may be formulated as follows (see above) :
m × u = v × b
Determining the measuring system resolution and the variable increment weighting
• The ROD encoder is mounted directly onto the leadscrew:
I
m = ––––
4p
Example: I = 10 mm; p = 2500; b = 0.5 × 10
10
m = –––––––– mm = 0.001 mm
4 × 2500
m v
––– = ––– =
b u
MD368* = 2; MD364* = 1;
_______
1) If a linear scale is used as the measuring system, this parameter must be set to 0.
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Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
Symbol MD Meaning
b 1800* Internal computational resolution of the
(Bit 0-3) control
f (signifies e.g. a five-fold EXE multiplication
of the pulses coming from the scale with
the factor 5)
g Period interval on a linear scale
l Leadscrew pitch
m Maximum resolution of the measuring
system. The value serves as a basis for
determining the actual value adjustment
factors.
p Number of pulses per revolution of the
ROD encoder
r Transmission ratio of a mechanical gearing
which may be present between motor and
ROD encoder
u 364* Evaluation of position control resolution
v 368* Evaluation of measuring system resolution
-3
mm;
0.001 mm 2
––––––––––––––= –––
-3
0.5 × 10 mm 1
6FC5197- AA50
6.4 Axis-specific MD 1 (axial data 1)
1)
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