Commissioning - Siemens SINUMERIK 840D sl Function Manual

Δn
max
Δn
min
a , a
1
a
3
B1 ...
B4
The amplitude of the velocity setpoint pulse Δn is calculated in the relevant acceleration range
B1 to B4 to form:
5.8.2

commissioning

To determine the axis-specific characteristic parameters, the Circularity test (Page 324) must
be used to determine the optimum amplitude of the velocity setpoint pulse Δn
of a number of acceleration values. The different acceleration values should cover the entire
dynamic range. In particular, a sufficient number of measurements must be ensured for low
acceleration values and large circle radii.
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.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Maximum amplitude of the velocity setpoint pulse
Minimum amplitude of the velocity setpoint pulse
Acceleration interpolation points 1, 2, and 3
2,
Acceleration range 1 ... 4
Range Acceleration a
B1 a < a
B2 a ≤ a ≤ a
1
B3 a < a < a
2
B4 a ≥ a
5.8 Friction compensation with adaptive characteristic
Amplitude of the velocity setpoint pulse Δn
Δn = Δn * a / a
1 max
Δn = Δn
2 max
Δn = Δn + [(Δn
3 max
Δn = Δn
3 min
K3: Compensations
1
- Δn ) / (a - a )] * (a - a
min max 3 2
each for each
opt_a
)
2
/ r
2
329