Axis %2 Zero Mark Not Found; Axis %2 Measuring System Error; Axis %2 Reference Mark Missing - Siemens Sinamics S120 Diagnostic Manual

NCK alarms
20002 [Channel %1: ] Axis %2 zero mark not found
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: The hardware zero mark of the incremental position encoder or the substitute zero mark of the absolute position
encoder is not within a defined section.
Phase 2 of the reference point approach ends when the zero mark of the encoder has been detected after the rising/
falling edge of the NC/PLC interface signal DB380x DBX1000.7 (Deceleration reference point approach) has given
the trigger start. The maximum distance between the trigger start and the zero mark that follows is defined in the
MD34060 $MA_REFP_MAX_MARKER_DIST.
The monitor prevents a zero mark signal from being overtraveled and the next being evaluated as reference point sig-
nal. (Faulty cam adjustment or excessive delay by the PLC user program).
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department.
Check the cam adjustment and make sure that the distance is sufficient between the end of the cam and the zero
marker signal that follows. The path must be greater than the axis can cover in the PLC cycle time.
Increase the MD34060 $MA_REFP_MAX_MARKER_DIST, but do not select a value greater than the distance
between the 2 zero markers. This might result in the monitor being switched off.
Program Clear alarm with the RESET key. Restart part program
Continuation:
20003 [Channel %1: ] Axis %2 measuring system error
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: In a measuring system with distance-coded reference marks, the distance between two adjacent markers has been
found to be more than twice the value entered in MD34300 $MA_ENC_REFP_MARKER_DIST. The control does not
issue the alarm until it has again detected a distance that is too long after having made a 2nd attempt in reverse direc-
tion with half the traversing velocity.
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Determine the distance between 2 odd reference marks (reference mark interval). This value (which is 20.00 mm on
Heidenhain scales) must be entered in MD34060 $MA_REFP_MAX_MARKER_DIST.
Check the reference track of the scale including the electronics for the evaluation.
Program Clear alarm with the RESET key. Restart part program
Continuation:
20004 [Channel %1: ] Axis %2 reference mark missing
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: In the distance-coded length measurement system, 2 reference marks were not found within the defined searching
distance (axis-specific MD34060 $MA_REFP_MAX_MARKER_DIST).
A reduction cam is not required for distance-coded scales (but an existing cam will be evaluated). The conventional
direction key determines the direction of search.
The searching distance MD34060 $MA_REFP_MAX_MARKER_DIST, within which the two reference marks are
expected is counted commencing at the start point.
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
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Diagnostics Manual, 07/2010, 6FC5398-8BP40-0BA0
Alarms