Axis %2 Reference Cam Not Reached; Axis %2 No Cam Signal Present - Siemens Sinamics S120 Diagnostic Manual

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Program
Clear alarm with the RESET key. Restart part program
Continuation:
20000
[Channel %1: ] Axis %2 reference cam not reached
Parameters:
%1 = Channel number
%2 = Axis name, spindle number
Definitions:
After starting the reference point approach, the rising edge of the reduction cam must be reached within the section
defined in the MD34030 $MA_REFP_MAX_CAM_DIST (phase 1 of referencing). (This error occurs only with incre-
mental encoders).
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.
There are 3 possible causes of error:
1. The value entered in MD34030 $MA_REFP_MAX_CAM_DIST is too small.
Determine the maximum possible distance from the beginning of reference motion up to the reduction cam and com-
pare with the value in MD34030 $MA_REFP_MAX_CAM_DIST, increase the value in the MD if necessary.
2. The cam signal is not received by the PLC input module.
Operate the reference point switch manually and check the input signal on the NC/PLC interface (route: Switch! Con-
nector! Cable! PLC input! User program).
3. The reference point switch is not operated by the cam.
Check the vertical distance between reduction cam and activating switch.
Program
Clear alarm with the RESET key. Restart part program
Continuation:
20001
[Channel %1: ] Axis %2 no cam signal present
Parameters:
%1 = Channel number
%2 = Axis name, spindle number
Definitions:
At the beginning of phase 2 of reference point approach, the signal from the reduction cam is no longer available.
Phase 2 of reference point approach begins when the axis remains stationary after deceleration to the reduction cam.
The axis then starts in the opposite direction in order to select the next zero marker of the measuring system on leaving
the reduction cam or approaching it again (negative/positive edge).
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 whether the deceleration path after the approach
velocity is greater than the distance to the reference point cam - in which case the axis cannot stop until it is beyond
the cam. Use a longer cam or reduce the approach velocity in MD34020 $MA_REFP_VELO_SEARCH_CAM.
When the axis has stopped at the cam, it must be checked whether the signal DB380x DBX1000.7 (Deceleration ref-
erence point approach) is still available at the interface to the NCK.
- Hardware: Wire break? Short circuit?
- Software: User program?
Program
Clear alarm with the RESET key. Restart part program
Continuation:
Alarms
Diagnostics Manual, 07/2010, 6FC5398-8BP40-0BA0
NCK alarms
297

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