Commissioning - Siemens SINUMERIK 840D sl Function Manual

Δn
opt
a
5.7.2

Commissioning

To determine the axis-specific compensation value Δn
be used to determine the optimum amplitude of the velocity setpoint pulse Δn
a number of acceleration values. The different acceleration values should cover the entire
dynamic range.
Calculation of the acceleration at the quadrant transition
On a circular path, the acceleration a of a machine axis on direction reversal at the quadrant
transition is calculated from the radius r of the circle and the path velocity v: a = v
Note
The path velocity and therefore the axis-specific acceleration a can be varied simply via the
feedrate override.
Evaluation of the value pairs determined (a, Δn
To determine the compensation value Δn
pairs determined in the circularity test comprising the acceleration a and the associated
optimum amplitude of the velocity setpoint pulse Δn
Figure 5-15
The optimum amplitude of the velocity setpoint pulse Δn
line G1.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Amplitude of the velocity setpoint pulse
Acceleration at the quadrant transition
Axis-specific characteristic determination
5.7 Friction compensation with a constant compensation value
)
opt_a
, we recommend graphically applying the value
opt
opt_a
K3: Compensations
, the Circularity test (Page 324) must
opt
: Δn = f(a)
opt_a
is obtained by drawing in the straight
opt
for each of
opt_a
/ r
2
323