09.95 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.5 Spindle-specific MD (spindle data)
MD 403* MD 404* MD 405*
MD 448*
Voltage
[volts]
Speed [rev/min]
10
MD 411*
MD 412*
MD 413*
Umax
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.
Umax: maximum setpoint speed voltage (MD 468*)
Acceleration time constant for eight gears
419*-426*
Default value Lower input limit Upper input limit Units
800 +0 50 000 1 ms
Active on
NC Stop
Gear 1 2 3 4 5 6 7 8
NC MD 419* 420* 421* 422* 423* 424* 425* 426*
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 6FC5197- AA50 6–67
SINUMERIK 840C (IA)