09.95
Siemens AG 2001 All Rights Reserved 6FC5197–jAA50 5–15
SINUMERIK 840C (IA)
5.2.4 Measuring system adaptation for axes and spindles(as from SW 4)
Explanation This function is used to automatically calculate the position control resolution and
measuring system resolution (optimization of the closed position control loop).
You will find the function under the softkey path Machine data/NC MD/Axis (or
Spindle) measuring system data. After you have entered the parameters (see
table below), move to the NC machine data Pulses var. incremental weighting
(Axis: NC MD 3640/Spindle NC MD: 4550) or Traversing path var. incremental
weighting (Axis: NC MD 3680/Spindle: NC MD 4560) and trigger calculation by
pressing the toggle key.
Notes If the data do not correspond, a number sign ”#” is displayed next to the machine
data ”Pulses var. incremental weighting” and ”Traversing path var. incremental
weighting”. As soon as the values have been calculated a tick ”n” is displayed.
Machine data f: Pulse multiplication EXE/611D/HMS (Axis: NC MD
11160/Spindle: NC-MD 4580) should be matched in such a way that the condition
measuring system resolution < position control resolution is given.
Parameter table This table lists the parameters for the measuring system adaptation.
Parameter Symbol NC-MD
axis/spindle Meaning
Position control
resolution b 18000.0–3/5240.0–3 Internal computational resolution of control
Pulse multiplication
EXE/611D/HMS f 11160/4580 Multiplier input
Grating constant g 39120/– Distance between marks on a linear scale
Spindle pitch l 39120/– Leadscrew pitch
Measuring system reso-
lution m – Maximum resolution of measuring system-
The value is used as the basis
Pulses per revolution p 39080/24220 Number of encoder pulses per revolution
Gear factor r – Speed ratio between number of revolutions
on load side (r1) and number of revolutions
on motor side (r2)
Number of revolutions
on load site r1 39000/24200 Actual speed of axis or spindle
Number of revolutions
on motor side r2 39040/24210 Actual speed of motor for axis or spindle
Pulses variable
incremental weighting u 3640/4550 Position control resolution weighting
Traversing path variable
incremental weighting v 3680/4560 Measuring system resolution weighting
Note Machine data 39000–39120 and 24210–24220 are used for internal calculations
only.
Formulas used
for calculation Measuring system resolution (axis) : m +rxl
4xpxf
Measuring system resolution (spindle) : m +r x 360 degr.
4xpxf
Ratio : Measuring system resolution
Position control resolution åm
b+v
u
Gearbox factor : r +r1
r2
or m +rxg
4xpxf
5 Machine Data Dialog (MDD – as from SW 3)
5.2.4 Measuring system adaptation for axes and spindles (as from SW 4)