Machine data
2.4 Axis-specific machine data
Parameter Manual
242
Operating Instructions, 08/2013, 6FC5397-8EP40-0BA0
Description:
The maximum distance that can be traversed because of temperature compensa-
tion in one IPO cycle can be limited by the axial MD32760
$MA_COMP_ADD_VELO_FACTOR.
If the resulting temperature compensation value is above this maximum, it is
traversed over several IPO cycles. There is no alarm.
The maximum compensation value per IPO cycle is specified as a factor refer-
ring to the maximum axis velocity (MD32000 $MA_MAX_AX_VELO).
The maximum gradient of the temperature compensation tanbmax is also limited
with this machine data.
Example of calculation of the maximum gradient tanb(max):
1. Calculation of the interpolator cycle time (see Description of Functions
Velocities, Setpoint/Actual Value Systems, Cycle Times (G2))
Interpolator cycle time = Basic system clock rate * factor for interpolation
cycle
Interpolator cycle time = MD10050 $MN_SYSCLOCK_CYCLE_TIME ^ MD10070
$MN_IPO_SYSCLOCK_TIME_RATIO
Example:
MD10050 $MN_SYSCLOCK_CYCLE_TIME = 0.004 [s]
MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO = 3
-> Interpolator cycle time = 0.004 * 3 = 0.012 [s]
2. Calculation of the maximum velocity increase resulting from a change
made to the temperature compensation parameter DvTmax
DvTmax = MD32000 $MA_MAX_AX_VELO * MD32760 $MA_COMP_ADD_VELO_FACTOR
Example: MD32000 $MA_MAX_AX_VELO = 10 000 [mm/min]
MD32760 $MA_COMP_ADD_VELO_FACTOR = 0.01
-> DvTmax = 10 000 * 0.01 = 100 [mm/min]
3. Calculation of the traverse distances per interpolator cycle
0.012
S1 (at vmax) = 10 000 x --------- = 2.0 [mm]
60
0.012
ST (at DvTmax) = 100 x --------- = 0.02 [mm]
60
4. Calculation of tanbmax
ST 0.02
tanbmax = ---- = ------ = 0.01 (corresponds to value for
S1 2 COMP_ADD_VELO_FACTOR)
-> bmax = arc tan 0.01 = 0.57 degrees
With larger values of SD43910 $SA_TEMP_COMP_SLOPE, the maximum gradient (here
0.57 degrees) for the position-dependent temperature compensation value is
used internally. There is no alarm.
Note:
Any additional excessive velocity resulting from temperature compensation
must be taken into account when defining the limit value for velocity moni-
toring (MD36200 $MA_AX_VELO_LIMIT).
MD irrelevant for:
32760 COMP_ADD_VELO_FACTOR EXP, A09, A04 K3
- Excessive velocity due to compensation DOUBLE NEW CONF
CTEQ
- - 0.01 0. 0.10 1/1
To Next Page
Loading...
Need help?
General
