Measuring System Monitoring - Siemens SINUMERIK 840D sl Function Manual

Activation
The actual-velocity monitoring is activated as soon as the active measuring system returns
valid actual values (encoder limit frequency not exceeded).
Effectiveness
The actual-velocity monitoring only operates with active position control and the following axis
types:
● Linear axes
● Rotary axes
● Open-loop-controlled and position-controlled spindles
Fault
If the threshold is exceeded, the following alarm is displayed:
25030 "Axis <Axis name> Actual-velocity alarm limit"
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)
3.2.5

Measuring system monitoring

The NC has no direct access to the measuring system hardware, therefore measuring system
monitoring is mainly performed by the drive software.
Monitoring functions in the drive
● Monitoring of hardware faults (e.g. measuring system failure, wire breakage)
● Zero-mark monitoring
References:
Drive Functions SINAMICS S120
Measuring system monitoring functions carried out in the drive are mapped on the NCK alarms
(alarm 25000 and following) or NC reactions (e.g. abort of referencing or on-the-fly measuring).
The exact behavior of the NC depends on the setting in the machine data:
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
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