Siemens SINUMERIK 840C - Manual (Page 233)

6 NC Machine Data (NC MD), NC Setting Data (NC SD) 09.95
6.4 Axis-specific MD 1 (axial data 1)
Maximum setpoint speed (IPO stop) 268*
Default value Lower input limit Upper input limit Units
8 192 1)
10 000 2)
10 000 3)
+0
0
0
8 192
20 000
20 000
VELO
0.01 % of max.
motor speed
Active on
NC Stop
This entry defines the maximum voltage value to be output as setpoint speed. This value
depends on the setpoint limiting values, if any, in the speed controller (normally 10 V). Alarm
104* (speed setpoint alarm limit) is triggered when the limiting value is exceeded.
Note carefully
It must be possible, however, to reach the maximum speed (rapid traverse) safely, i.e. tacho
compensation must be such that the IPO Stop limit is not reached because of reading and
adjustment inaccuracies resulting from fluctuations in speed during operation (e.g. maximum
speed = 9.5 V setpoint speed).
See also Section entitled ”Axis (Analog) and Spindle Installation”.
Drift compensation 272*
Default value Lower input limit Upper input limit Units
0 1)
0 2)
- 500
- 500 500
500
VELO 1)
0.01 % of max.
motor speed 2)
Active on
NC Stop
The temperature drift in analog electronic components (primarily in the motor control unit)
causes the axes to wander from their set position until the following error produces a counter-
setpoint that corresponds to the temperature drift.
Failure of the > < characters next to the actual values in the Machine display to disappear
from the screen although the axes are at a standstill indicates that the following error brought
about by the drift has reached a value that is so high that the axes can no longer be moved
until the drift has been compensated.
Refer to Section entitled ”Axis (Analog) and Spindle Installation” for details on drift
compensation.
_______
1) Up to SW 2
2) As from SW 3
3) As from SW 4
6–48 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)