Siemens SINUMERIK 840Di Manual page 337

06.03
ADI4
Calculation of the
motor speed
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
Because ADI4 does not support acyclic services on the PROFIBUS DP, manual
speed setpoint matching must be performed.
In the two axis-specific NC machine data:
S
MD32260: RATED_VELO (rated motor speed) [ rev/min ]
S
MD32250: RATED_OUTVAL (rated output voltage) [ % ]
the reference between the speed setpoint set by the NC and the associated
output voltage at the setpoint output of the ADI4 is established (reference volt-
age = 10V).
SINUMERIK 840Di-NC
MD32260: RATED_VELO
Note
The max. upper limit for the speed setpoint is set in machine data
S
MD 36210: CTRLOUT_LIMIT (max. speed setpoint) [ % ]
Values greater than 100% make sense in connection with ADI4 because the
DACs of the ADI4 limit the output voltage to 10V.
If the motor speed required for speed setpoint matching is not known directly, it
can be calculated as follows with reference to the required axis velocity (linear
axis) or load speed (rotary axis/spindle):
Motor speed for linear axis
MD 31060: DRIVE_RATIO_NUMERA
v
*
Axis
MD31050: DRIVE_RATIO_DENOM
=
n
Motor
MD31030: LEADSCREW_PITCH
Motor speed for rotary axis/spindle
MD 31060: DRIVE_RATIO_NUMERA
=
n n
*
Motor Load
MD31050: DRIVE_RATIO_DENOM
v
–
[ mm/min ]
Axis
–
MD31060: DRIVE_RATIO_NUMERA (numerator load gearbox)
–
MD31050: DRIVE_RATIO_DENOM (denominator load gearbox)
–
MD31030: LEADSCREW_PITCH (pitch of the ball screw) [ mm/rev ]
n
–
[ rpm ]
Motor
n
–
[ rpm ]
Load
10 NC Start-Up with HMI Advanced
10.5 Axes and spindles
ADI4
MD32250: RATED_OUTVAL
2
10V *
100
10-337