Detailed description
2.1 Axis monitoring
Basic logic functions: Axis monitoring, protection zones (A3)
22 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Speed-setpoint monitoring delay
To prevent an error reaction from occurring in every speed-limitation instance, a delay time
can be configured:
MD36220 $MA_CTRLOUT_LIMIT_TIME (Speed-setpoint monitoring delay)
Only if the speed limitation is required for longer than the configured time does the
corresponding error reaction occur.
Effectivity
The speed-setpoint monitoring is only active for closed-loop position-controlled axes and
cannot be deactivated.
Fault
If the configured delay time is exceeded, the following alarm appears:
25060 "Axis <Axis identifier> Speed-setpoint monitoring"
The affected axis is stopped via the configured braking ramp in follow-up mode:
MD36610 $MA_AX_EMERGENCY_STOP_TIME
(Maximum time for braking ramp when an error occurs)
Note
Upon reaching the speed-setpoint monitoring, the position feedback loop of the axis
becomes non-linear due to the limitation. Contour errors result if the axis is involved in
generating the contour.
2.1.4 Actual velocity monitoring
Function
The actual-velocity monitoring checks that the current actual velocity of a machine
axis/spindle does not exceed the configured threshold:
MD36200 $MA_AX_VELO_LIMIT (velocity-monitoring threshold)
The threshold should be 10-15% above the configured maximum velocity.
• For axes:
MD32000 $MA_MAX_AX_VELO (maximum axis velocity)
• For spindles:
MD35110 $MA_GEAR_STEP_MAX_VELO_LIMIT[n] (maximum speed of gear stage)
If you use this setting the speed will not normally exceed the velocity-monitoring threshold
(exception: drive error).
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