Siemens Sinumerik 840D sl Diagnostic Manual page 318

Overview of Alarms
NCK alarms
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 compare 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! Connector! 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 Con- Clear alarm with the RESET key. Restart part program
tinuation:
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 DB31, ... DBX12.7
(Deceleration reference point approach) is still available at the interface to the NCK.
- Hardware: Wire break? Short circuit?
- Software: User program?
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
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 abso-
lute 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 DB31, ... DBX12.7 (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 ref-
erence point signal. (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 Con- Clear alarm with the RESET key. Restart part program
tinuation:
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG, 2009. All Rights Reserved
03/2009