Detailed description
2.1 Axis monitoring
Basic logic functions: Axis monitoring, protection zones (A3)
8 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
2.1.1.2 Following Error Monitoring
Function
In control engineering terms, traversing along a machine axis always produces a certain
following error, i.e., a difference between the set and actual position.
The following error that arises depends on:
• Position control loop gain
MD32200 $MA_POSCTRL_GAIN (servo gain factor)
• Maximum acceleration
MD32300 $MA_MAX_AX_ACCEL (Maximum axis acceleration)
• Maximum velocity
MD32000 $MA_MAX_AX_VELO (maximum axis velocity)
• With activated feedforward control: Precision of the path model and the parameters:
MD32610 $MA_VELO_FFW_WEIGHT (factor for the velocity feedforward control)
MD32800 $MA_EQUIV_CURRCTRL_TIME (Equivalent time constant current control loop
for feedforward control)
MD32810 $MA_EQUIV_SPEEDCTRL_TIME (equivalent time constant speed control loop
for feedforward control)
In the acceleration phase, the following error initially increases when traversing along a
machine axis. After a time depending on the parameterization of the position control loop,
the following error then remains constant in the ideal case. Due to external influences, more
or less large fluctuations in the following error always arise during a machining process. To
prevent these fluctuations in the following error from triggering an alarm, a tolerance range
within which the following error may change must be defined for the following-error
monitoring:
MD36400 $MA_CONTOUR_TOL (Contour monitoring tolerance range)
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