Siemens Sinumerik 840D sl Diagnostic Manual page 430

Overview of Alarms
NCK alarms
When the user enable has first been set, follow-up referencing must be carried out each time the con-
trol is booted (with absolute encoders, this follow-up referencing is executed automatically). This pro-
cedure is carried out to verify the standstill position saved prior to switching off of the control.
Via the MD $MN_SAFE_ALARM_SUPPRESS_LEVEL (MD>=3), the alarm display can be set in such
a way that an alarm is given for each axis individually which has not been safely referenced.
Reaction: Alarm display.
SGA "Axis safely referenced" is not set. SE will be switched off, if the actual safety position has not
yet been confirmed by a user agreement. If the user agreement has been set, SE will remain active.
The safe cams are calculated and output. However, their significance is limited as referencing has not
been confirmed.
Remedy: Move all SI axes to known positions and change to "Referencing" mode. Check the positions on the
machine displayed in the user confirmation field and set "User confirmation" via the selection/toggle
key. If the user confirmation for the axes has already been set, reference the axes again.
Changing the user confirmation will be possible only in key switch position 3 or after password entry
Program Con- Alarm display showing cause of alarm disappears. No further operator action necessary.
tinuation:
27101 Axis %1 difference in function safe operational stop, NCK: %2 drive: %3
Parameters: %1 = Axis number
%2 = Monitoring status safe operating stop
%3 = Monitoring status safe operating stop
Definitions: During cross-comparison of result list 1 a difference was detected between the NCK and drive moni-
toring channels in the status of safe operating stop monitoring.
Safe operating stop: Bit 0,1 in result list 1
Monitoring status (%2, %3):
- OFF = Monitoring is inactive in this monitoring channel
- OK = Monitoring is active in this monitoring channel, limit values are not violated
- L+ = Monitoring is active in this monitoring channel, upper limit exceeded
- L- = Monitoring is active in this monitoring channel, lower limit exceeded
Reaction: Alarm display.
If a safe monitoring was active, STOP B was also triggered automatically. In this case, a power
OFF/ON of the control will be required.
Remedy: Check whether the safe inputs have switched to the same status in both monitoring channels within
the permissible time tolerance.
For further diagnostics, the drive parameters r9710[0], r9710[1] and the servo trace signals "Result list
1 NCK" and "Result list 1 drive" can be used.
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
27102 Axis %1 difference in function safe velocity %2, NCK: %3 drive: %4
Parameters: %1 = Axis number
%2 = SG level for which the difference was determined
%3 = Monitoring status safe velocity
%4 = Monitoring status safe velocity
Definitions: During cross-comparison of result list 1 a difference was detected between the NCK and drive moni-
toring channels in the status of safe velocity monitoring.
- Safe velocity 1: Bit 6, 7 in result list 1
- Safe velocity 2: Bit 8, 9 in result list 1
- Safe velocity 3: Bit 10, 11 in result list 1
- Safe velocity 4: Bit 12, 13 in result list 1
Monitoring status (%3, %4):
- OFF = Monitoring is inactive in this monitoring channel
- OK = Monitoring is active in this monitoring channel, limit values are not violated
- L+ = Monitoring is active in this monitoring channel, upper limit exceeded
- L- = Monitoring is active in this monitoring channel, lower limit exceeded
Reaction: Alarm display.
If a safe monitoring was active, STOP B was also triggered automatically. In this case, a power
OFF/ON of the control will be required.
Remedy: Check whether the safe inputs have switched to the same status in both monitoring channels within
the permissible time tolerance.
For further diagnostics, the drive parameters r9710[0], r9710[1] and the servo trace signals "Result list
1 NCK" and "Result list 1 drive" can be used.
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG, 2009. All Rights Reserved
03/2009