Siemens SINUMERIK 840Di Diagnostic Manual page 22

Overview of Alarms
NCK alarms
2100 NCK battery warning threshold reached
Definitions: The undervoltage monitor of the NCK battery has reached the prewarning threshold. This is at 2.7-2.9
V (nominal voltage of the battery is 3.0-3.1 V at 950 mAh).
Reaction: Alarm display.
Remedy: Please inform the authorized personnel/service department. The battery must be replaced within the
next 6 weeks. After this period, the voltage can drop below the alarm limit of 2.4-2.6 V if the RAMs to
be buffered take up a lot of current.
Program Clear alarm with the Delete key or NC START.
Continuation:
2101 NCK battery alarm
Definitions: The undervoltage monitoring (2.4 - 2.6 V) of the NCK battery has responded during cyclic operation.
Reaction: Alarm display.
Remedy: If the NCK battery is replaced without interrupting the power supply, no data will be lost. This means
that production can continue without taking any further steps. (A buffer capacitor on the NCK holds
the supply voltage for at least 30 minutes and the battery can be replaced within this time even when
the control is switched off).
Program Clear alarm with the Delete key or NC START.
Continuation:
2102 NCK battery alarm
Definitions: The undervoltage monitoring (2.4 - 2.6 V) of the NCK battery was detected during system power-up.
Reaction: NC not ready.
The NC switches to follow-up mode.
Channel not ready.
NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department. Pull out the battery/fan unit from the NC
module and replace the battery (type: lithium battery with lead, size 1/2 AA, 850 mAh, min. 3.2 V).
The system must then be reinitialized because it must be assumed that data has been lost in the
buffered RAM during the last power-off phase as a result of insufficient supply voltage (refer to Section
2.2 in the Installation and Start-up Guide for the procedure).
The following data might have been corrupted or entirely lost:
- NC machine data
- Drive machine data
- Option data
- Setting data
- User variable
- Global subroutines
- Cycles and macros, as well as
- PLC machine data
- PLC basic program
- PLC user program, and all
- PLC user data
User data in the NCK and PLC (e.g. tool and workpiece data) that have been altered by the
manufacturing process since the last data backup must be updated manually to match the present
machine status!
Program Switch control OFF - ON.
Continuation:
2-22
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006