Parameter Set-Dependent Exact Stop And Standstill Tolerance - Siemens SINUMERIK 840D sl Function Manual

checks the zero-speed monitoring to ensure that the following error of every participating
machine axis is smaller than the standstill tolerance during the delay time.
MD36040 $MA_STANDSTILL_DELAY_TIME (zero-speed monitoring delay time)
MD36030 $MA_STANDSTILL_POS_TOL (standstill tolerance)
After reaching the required exact-stop state, the positioning operation is completed:
DB31, ... DBX60.6/7 (position reached with exact stop coarse/fine) = 1
The position-monitoring function is deactivated and is replaced by the zero-speed monitoring.
Zero-speed monitoring monitors the adherence to the standstill tolerance. If no new travel
request is received, the machine axis must not depart from the standstill tolerance.
Effectiveness
The zero-speed monitoring only operates with active position control and the following axis
types:
● Linear axes
● Rotary axes
● Position-controlled spindles
Fault
If the delay time and/or the standstill tolerance is exceeded, the following alarm appears:
25040 "Axis <Axis name> Zero-speed 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)
3.2.2.4

Parameter set-dependent exact stop and standstill tolerance

For adaptation to different machining situations and/or axis dynamics, e.g.:
● Operating state A: High precision, long machining time
● Operating state B: Lower precision, shorter machining time
● Changing of the mass relationships after gear change
the positioning tolerances:
● MD36000 $MA_STOP_LIMIT_COARSE (exact stop coarse)
● MD36010 $MA_STOP_LIMIT_FINE (exact stop fine)
● MD36030 $MA_STANDSTILL_POS_TOL (standstill tolerance)
can be weighted with a common factor depending on the parameter set:
MD36012 $MA_STOP_LIMIT_FACTOR (exact stop coarse/fine and standstill factor)
Because the factor applies in common for all three position tolerances, the relationship
between the values remains constant.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
A3: Axis Monitoring, Protection Zones
3.2 Axis monitoring functions
85