Siemens SINUMERIK 840C - Manual (Page 537)

7 Drive Machine Data (SIMODRIVE Drive MD) 04.96
7.3.2 Drive MD (data description)
Maximum motor speed set-up mode 1420
Default value Lower input limit Upper input limit Units
30.0 0.0 50 000.0 rev/min
Active
at once
Input of maximum motor speed for set-up mode. During set-up, the absolute speed setpoint
value is limited to the value specified above. If the speed setpoint is limited to the value set in
MD 1420, a message is also output.
Time constant integrator feedback 1421
Default value Lower input limit Upper input limit Units
0.0 0.0 1 000.0 ms
Active
at once
The speed controller loop integrator is reduced via a weighted feedback to a low-pass
response of the 1st order with the configured time constant.
Effect:
The speed controller integrator output is limited to a value which is proportional to the setpoint-
actual value difference (steady-state proportional operating characteristic).
Applications:
• Machining motions with zero position setpoint and dominant static friction can be
suppressed (at the cost of a permanent position setpoint/actual value difference).
• Prevention of strain on rigidly coupled axes or spindles (synchronous spindle).
• Prevention of overshooting during positioning.
Note:
The integrator feedback is activated when MD 1421 is set to 1.0.
Symmetr. speed feedfwd ctrl channel 1424
Default value Lower input limit Upper input limit Units
0.0 0.0 50 000.0 µ s
Active
at once
Input of time constant of the 1st-order balancing filter in the speed feedforward control channel
of the speed/torque feedforward control. The setpoint response of the closed current conrol
loop can be adjusted by entering an appropriate time value in MD 1424, resulting in
symmetrization of the higher-level speed control loop. Allowance is automatically made for the
time constants of the active current setpoint filters (low-pass filters only) when the balancing
filter is initialized.
Note:
When the value 0 is entered, the filter is only deactivated (proportional element with gain factor
1) if no low passes are currently active as the current setpoint filter.
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SINUMERIK 840C (IA)