NCK alarms
06/2009 Overview of alarms
2-63
© Siemens AG 2009 All Rights Reserved
SINUMERIK 802D sl, Diagnostics Manual, 06/2009
Definitions: This alarm is output, if at least one of the relevant blocks when inserting chamfers or radii is so short,
that the contour element to be inserted must be reduced against its originally programmed value. The
alarm occurs only if bit 4 is set in the MD11411 $MN_ENABLE_ALARM_MASK. Otherwise, the cham-
fer or radius is adapted without an alarm being output.
Reaction: Local alarm reaction.
Interface signals are set.
Alarm display.
NC Stop on alarm at block end.
Remedy: Modify NC program of continue program without modifications after CANCEL and Start or with Start
alone.
Program Con-
tinuation:
Clear alarm with the Delete key or NC START.
10900 [Channel %1: ] Block %2 no S value programmed for constant cutting
speed
Parameters: %1 = Channel number
%2 = Block number, label
Definitions: If G96 is active, the constant cutting speed under address S is missing.
Reaction: Correction block is reorganized.
Local alarm reaction.
Interface signals are set.
Alarm display.
Remedy: Program constant cutting speed under S in [m/min] or deselect the function G96. For example, with
G97 the previous feed is retained but the spindle continues to rotate at the current speed.
Program Con-
tinuation:
Clear alarm with NC START or RESET key and continue the program.
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-
tinuation:
Clear alarm with the Delete key or NC START.
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.
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