Siemens Sinumerik 840D sl Diagnostic Manual page 123

03/2009
10910 [Channel %1: ] Block %2 irregular velocity waveform of one path axis
Parameters: %1 = Channel number
%2 = Block number, label
Definitions: When the path axis waveforms were analyzed during block preparation, a large local deviation relative
to the path velocity was detected in the velocity waveform of one or more path axes.
Such a situation can have the following causes:
- The path runs close to singular positions of the machine kinematics.
- The programmed contour characteristic is very uneven.
- The FGROUP definition is unfavorable relative to the contour.
- The setting MD28530 $MC_MM_PATH_VELO_SEGMENTS=0 is inadequate for curvature changes
occurring within one block. This problem occurs more frequently with G643, G644 and COMPCAD.
- A kinematic transformation has been implemented with insufficient numerical accuracy.
The path velocity is generally reduced substantially in order to avoid axis overloads safely. An appar-
ent machine standstill may occur. Severe axis movements occur suddenly as soon as the singular
position is reached.
Reaction: Local alarm reaction.
Alarm display.
Remedy: Dividing a block into several smaller ones often provides an improvement.
If MD28530 $MC_MM_PATH_VELO_SEGMENTS=0 is set, then the alarm may be avoidable by a
value MD28530 $MC_MM_PATH_VELO_SEGMENTS=3 or 5, as the blocks are then analyzed con-
siderably more accurately.
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
10911 [Channel %1: ] Block %2 transformation prohibits to traverse the pole
Parameters: %1 = Channel number
%2 = Block number, label
Definitions: The given curve passes through the pole of the transformation.
Reaction: Interpreter stop
Local alarm reaction.
NC Start disable in this channel.
Interface signals are set.
Alarm display.
Remedy: Modify part program.
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
10912 [Channel %1: ] Block %2 preprocessing and main run might not be
synchronized
Parameters: %1 = Channel number
%2 = Block number, label
Definitions: The preset positioning axis run cannot be accurately calculated beforehand. The reason for this is
either that the axes involved in the transformation are traversed as positioning axes or that a transfor-
mation pole is circumnavigated too frequently by the curve.
The velocity check is performed starting from this block in the main run. It is more conservative than
with anticipated calculation. The LookAhead function is deactivated. If it is not possible to take over
the velocity check into the main run, part program processing is aborted.
Reaction: Alarm display.
Remedy: No action is usually necessary. The velocity control operates more effectively, however, if the part pro-
gram is modified.
- If a transformation pole is circumnavigated several times by the curve, it helps to split up the block
into smaller parts.
- If a positioning axis is the cause, you should check whether the axis can be traversed as a path axis.
The Look Ahead function remains deactivated until preprocessing can be based on defined conditions
again (e.g. as a result of change from JOG->AUTO, tool or tool edge change).
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
© Siemens AG, 2009. All Rights Reserved
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
NCK alarms
2-123