Siemens SINUMERIK 840D sl Function Manual page 492

Diagnostics
10.2 NCK safety alarms for SINUMERIK 840D sl
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
pired. If, in a monitoring channel, an SGE change (e.g. SBH is se-
lected), then the so–called change timer is started (timer value =
MD 36950/p9550).
In addition, a so–called checking timer is started in the other channel
(timer value = 10xMD 36950).
While the change timer is running, if the same SGE is changed again,
the timer value is extended and the check timer in the other channel
only runs once.
If the change timer is extended so often that the run time is greater
than for the check timer then the fault is output.
Too many signal changes were detected during the checking timer run-
time.
Remedy
Determine the SGE involved and the associated hardware signal and
investigate the situation. There may be contact problems at the sensor
(e.g. poor contact) or there were too many switching operations. If nec-
essary, the behavior can be improved by changing the timer setting.
1001
Only in the drive: Initialization error of the check timer, refer to F01711.
1002
The user agreement is not consistent: The status of the user agree-
ment is, after 2 s has expired, different for both monitoring channels.
%3 = status of the user agreement, NCK.
%4 = status of the user agreement, drive.
This effect can occur if the user agreement is only set or reset through
one channel.
An additional fault cause is that if the F code 1003 only occurs in one
monitoring channel and then the user agreement is only withdrawn
through one channel. This means that code 1002 is then the result of a
code 1003 only in one channel.
1003
With the user agreement is set, the difference between the newly deter-
mined reference point (NC actual value) after booting (absolute value
encoder) or reference point approach [homing] (distance–coded or in-
cremental measuring system) and the safe actual position (saved value
+ traversing distance) is greater than the reference tolerance MD
36944/p9544. In this case, the user agreement is withdrawn.
Remedy
Check the mechanical system of the axis – it is possible that the axis
was moved when powered–down and the actual value last saved by
the control no longer corresponds with the new value the next time the
system is booted. It is also possible that the tolerance window for the
check has been set too narrow. The cause should be determined and
after checking the actual values the user agreement can be again reset
after an NCK–RESET.
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05.08