09.95 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.4 Axis-specific MD 1 (axial data 1)
Scaling factor maximum speed setpoint
260*
Default value Lower input limit Upper input limit Units
8 000 1)
10 000 2)
9 000 3)
1
0
1
99 999 999
20 000
20 000
0.01 % of
max. setpoint
Active for all
channels of
mode groups
in STOP
Active: for all channels of mode group in stop
The multgain factor is used to match the controlled system to the KV factor specified in
NC MD 252*. The multgain is a pure multiplier for the specified KV factor, and should be used
for precision digital tacho-generator matching in view of the very fine adjustment
capabilities.
Following the correct entry or matching of the multgain, the KV factor produced for the relevant
axis must correspond precisely to the specified value.
Note:
Matching of the actual KV factor via NC MD 252* (KV factor) is not to be recommended, as
different input values would be obtained for the various axes despite identical gain in the
position control loop.
Where Umax is the speed setpoint voltage at maximum motor speed
Multgain = Umax [mV]
If problems of precision or restrictions caused by input limits occur, the factors between MD
256* and 260* can be reduced or increased. See Section entitled ”Axis (Analog) and Spindle
Installation”. See MD 141 for digital drive.
Threshold value for drive errors
264*
Default value Lower input limit Upper input limit Units
9 600 1)
12 000 2) +0
015 000
20 000
VELO
0.01% of max.
motor speed
Active on
NC Stop
The specified setpoint speed is monitored; if it is too high (control loop and drive errors), alarm
156* is triggered.
The specified value must be greater than the highest maximum setpoint speed specified in NC
MD 268*.
Recommended value
Approx. 20 % higher than the value in NC MD 268*
See also Section entitled ”Axis (Analog) and Spindle Installation”.
_______
1) Up to SW 2
2) As from SW 3
3) As from SW 4
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–47
SINUMERIK 840C (IA)