Siemens Sinumerik 840C Diagnostics Manual page 18

1 Alarms
1.5.1 Alarm description
6 Start-up due to system error
Scan
POWER ON
Effect
Start-up of the control shows that a fatal error was present before reset/power off (e.g. obligatory re-installation is
activated. Alarm 5 can be set in conjunction with alarm 6. EPROM error, DRAM error, processor exceptions).
Explanation
Re-installation is necessary as data loss or corruption is to be expected (no data consistency).
Remedy
The NCK unit must be completely re-installed.
Cause of error can be eliminated as follows:
a) Replace hardware
b) Report the software error leading to the processor exception to the manufacturer of the control.
7 15 V undervoltage
Scan
POWER ON
Cyclic
Effect
Activates 15V voltage monitoring
Explanation
Safe operation of the NC is no longer possible so NC Ready is cancelled.
Remedy
Eliminate hardware fault
8 Wrong axis/spindle assignment
S
Scan
After modification of machine data
S
On POWER ON
S
Effect
Interlocking of NC START
S
Removal of Mode Group Ready
S
NC Ready relay drops out
S
Machining stops
Explanation
The NC machine data for axis assignment MD200* or spindle assignment MD400* have been input incorrectly or
transposed.
If error in MD 461* C axis definition:
S
C axis must not be fictitious (MD 564*, bit 6)
S
C axis must be defined (MD 564*, bit 7)
S
Mode group numbers of C axis and spindle must be same
(MD 360*, MD 453*)
Remedy
Check and correct machine data for axis and spindle assignment.
Cancel alarm with POWER ON.
9 Not enough memory for UMS
S
Scan
At POWER ON in normal mode, not in start-up mode
Effect
None
Explanation
The RAM area reserved on the NC is too small for the UMS address lists for the modified system area.
Remedy
Describe fewer elements (displays/texts) in modified system area (merge).
Note
Applies up to SW 2 only
9 Overflow in altered system area
Scan
When powering up the control
Effect
The UMS does not function
Explanation
In the UMS, an altered system area has been configured that exceeds the memory area.
Remedy
Configure UMS properly
Note
Applies as from SW 4
1–10
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Siemens AG 2001 All rights reserved 6FC5198–jAB40
SINUMERIK 840C / SIMODRIVE 611–D (DA)
04/96
Acknowledgement key
Acknowledgement key
POWER ON
POWER ON
POWER ON