Siemens SINUMERIK 808D Function Manual

Function Manual
122 01/2017
a
2
Acceleration value 2
a
3
Acceleration value 3
Bn
Acceleration range with n = 1, 2, ... 4
with: Accelerations: a1 < a2 < a3
Compensation values: Δn
max
> Δn
min
, in special cases also Δn
max
< Δn
min
The compensation value Δn is calculated according to the respective acceleration range B1 to B4 as follows:
Range
With acceleration a
⇒ Compensation value Δn
B1 a < a
1
Δn = Δn
max
* a / a
1
B2
a
1
≤ a ≤ a
2
Δn = Δn
max
B3 a
2
< a < a
3
Δn = Δn
max
+ [(Δn
min
- Δn
max
) / (a
3
- a
2
)] * (a - a
2
)
B4
a ≥ a
3
Δn = Δn
min
11.5.4.2
Function activation
Enable
The general enabling of the friction compensation is via:
MD32490 $MA_FRICT_COMP_MODE[ <axis> ] = 1
Activation
The activation of the friction compensation with adaptation characteristic is performed via:
● MD32500 FRICT_COMP_ENABLE[ <axis> ] = 1 (friction compensation ON)
● MD32510 $MA_FRICT_COMP_ADAPT_ENABLE[ <axis> ] = 1 (adaptation characteristic OFF)
11.5.4.3
Commissioning
To determine the characteristic parameters, the optimum compensation value Δn
opt
must be determined at various operating
points of the specified dynamic response range. See Section "Commissioning (Page 118)". A sufficiently large number of
measured values for large path velocities and small circle radii is particularly important.
For the evaluation of the determined value pairs, it is recommended that these are displayed graphically:
Δn
opt
= f(a), with Δn
opt
= optimum compensation value and a = acceleration at the quadrant transitions.
The parameters of the adaptation characteristic determined from the measurement results must then be entered in the
machine data.
Characteristic parameters
Acceleration values
The acceleration which arises at the quadrant transitions of the axis changing direction is calculated as follows:
a = v
2
/ r, with v = path velocity and r = circle radius
Note
The path velocity and therefore the axial acceleration a can be varied simply via the feedr
ate override switch.
The acceleration values a
1
, a
2
and a
3
determined as characteristic parameters must be entered in the following machine
data. The following condition must be satisfied: a
1
< a
2
< a
3
● MD32550 $MA_FRICT_COMP_ACCEL1 (acceleration value 1)
● MD32560 $MA_FRICT_COMP_ACCEL2 (acceleration value 2)
● MD32570 $MA_FRICT_COMP_ACCEL3 (acceleration value 3)
Compensation values
The compensation values Δn
min
, Δn
max
determined as characteristic parameters must be entered in the following machine
data:
● MD32520 $MA_FRICT_COMP_CONST_MAX (maximum compensation value)

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English