Siemens SINUMERIK 840Di Function Manual page 412

Detailed Description
2.3 Setpoint/actual-value system
• Automatic adjustment
SINUMERIK 840D/810D with SIMODRIVE digital
Note
Velocity adjustment and maximum speed setpoint
The velocity does not need to be adjusted on a SINUMERIK 840D/810D due to automatic
speed setpoint comparison.
Maximum speed setpoint
With SINUMERIK 840D/810D, the maximum speed setpoint is the largest value,
which can be output on the SIMODRIVE 611 digital drive, due to the maximum speed set in
drive machine data:
MD1401/2401 $MD_MOTOR_MAX_SPEED
(maximum useful motor speed).
MD1401 corresponds to the maximum motor speed on the spindle drive. The desired speed
at the spindle is reached via the mechanical gear stage.
The output of the spindle speed is implemented in the NC for SINUMERIK 840D/840Di.
Data for 5 gear stages is implemented in the control.
The gear stages are defined by a minimum and maximum speed for the gear stage and a
minimum speed and a maximum speed for the automatic gear stage change. A new set gear
stage is output only if the new programmed speed cannot be traversed in the current gear
stage.
Machine data:
MD36210 $MA_CTRLOUT_LIMIT[n] (maximum speed setpoint)
is used to limit the speed setpoint to a certain percentage.
Values up to 200% are possible.
An alarm is output if the limit is exceeded.
2-38
Configuration values for setpoint scaling are adjusted automatically,
provided that machine data:
MD32250 $MA_RATED_OUTVAL[n] = 0.
The speed setpoint comparison through acyclic services at PROFIBUS DP can be
performed automatically.
Velocities, Setpoint/Actual-Value Systems, Closed-Loop Control (G2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0