Siemens SINUMERIK 840C Installation Instructions Manual page 252

09.95
Voltage
[volts]
U 10
max
MD 448*
MD 411*
MD 412*
If 3rd gear has been engaged, the new S value must be lower than the contents of MD 413* in
order for the NC to initiate a gear change.
U : maximum setpoint speed voltage (MD 468*)
max
419*-426*
Acceleration time constant for eight gears
Default value
800
Gear 1
NC MD 419*
The control provides the setpoint for acceleration in the form of a ramp that is based on the
contents of these MD. The MD thus act as variable ramp-function generators. They are set by
measuring the interval from zero speed to maximum speed for each gear. NC MD 419*-426*
can be set to zero when the drive actuator is equipped with an integrated ramp-function
generator.
Notes:
• There are two acceleration time constants for every stage:
– Acceleration time constant without position controller (MD 419* to 426*)
– Acceleration time constant without position controller (MD 478* to 485*)
• In control mode the time constants are used without position control.
In positioning mode the time constants are used with position control.
©
Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
MD 403* MD 404*
MD 413*
Lower input limit Upper input limit
+0
2 3 4
420* 421* 422*
6FC5197- AA50
6.5 Spindle-specific MD (spindle data)
MD 405*
Speed [rev/min]
Units
50 000 1 ms
5 6 7
423* 424* 425*
Active on
NC Stop
8
426*
6–67