Siemens SINUMERIK 840D sl Function Manual page 88

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Detailed description

2.1 Axis monitoring

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.

The speed-setpoint monitoring is only active for closed-loop position-controlled axes and

cannot be deactivated.

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)

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.

Actual velocity monitoring

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 spindles:

If you use this setting the speed will not normally exceed the velocity-monitoring threshold

(exception: drive error).

MD32000 $MA_MAX_AX_VELO (maximum axis velocity)

MD35110 $MA_GEAR_STEP_MAX_VELO_LIMIT[n] (maximum speed of gear stage)

Basic logic functions: Axis monitoring, protection zones (A3)

Function Manual, 11/2006, 6FC5397-0BP10-2BA0

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