Alarm Description - Siemens Sinumerik 840C Diagnostics Manual

04/96
1 Battery: Data loss at power off!
Scan
POWER ON
Cyclic
Effect
Data is not battery-backed after power off.
During operation:
Run-up:
Explanation
Backup battery is empty.
Remedy
Replace the battery when the control is switched on
If data has been lost the whole NCK/PLC unit must be re-installed.
2 Overtemperature
Scan
POWER ON
Cyclic
Effect
The second temperature monitoring threshold has been triggered because the ambient temperature is too high.
NC program is not interrupted.
Explanation
Safe functioning of the hardware can no longer be guaranteed, serious damage to hardware may result.
Processing is not interrupted directly. A contact is opened on the CSB which the NC user must use to take the
appropriate measures.
Remedy
A low temperature level will eliminate the error.
Switch off control (hardware damage possible).
3 Fan failure
Scan
POWER ON
Cyclic
Effect
Fan monitoring is triggered because of incorrect fan functioning.
Explanation
Safe functioning of the hardware can no longer be guaranteed, serious damage to hardware may result.
Processing is not interrupted directly. A contact is opened on the CSB which the NC user must use to take the
appropriate measures.
Remedy
Eliminate the fan fault, e.g. by replacing the fan.
Switch off control (hardware damage possible).
4 System of units not allowed
S
Scan
POWER ON
S
After modification of NC machine data
S
Effect
Interlocking of NC READY
S
Interlocking of NC START
S
Interlocking of Mode Group Ready
S
Machining stops
Exlanation
An illegal combination of machine data MD 18000 display resolution and MD 5002 input resolution has been
selected. Both data must use the same system of units
For rotary axes with a position control resolution smaller than = 0.5  10
lution rotary axis" must be set.
Remedy
Check and correct machine data combinations. Then cancel the alarm with POWER ON.
5 Power failure protection / data loss
Scan
POWER ON
Effect
The power failure protection integrated in the software could not be executed correctly because of a hardware
fault.
Explanation
Data loss in the NCK unit.
Obligatory re-installation is activated.
Remedy
The whole NCK unit must be re-installed.
Eliminate hardware fault.
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Siemens AG 2001 All rights reserved 6FC5198–jAB40
SINUMERIK 840C / SIMODRIVE 611–D (DA)
Do not interrupt the production process. Data will be lost if the control is switched off.
Data has been lost. Obligatory re-installation is activated.

1.5.1 Alarm description

Acknowledgement key
Acknowledgement key
Acknowledgement key
POWER ON
–4
degrees, the function bit "High-reso-
Acknowledgement key
1 Alarms
1–9