Siemens SINUMERIK 840D sl Series Diagnostics Manual page 20

Overview of Alarms
Reactions: - NC not ready.
- Local alarm reaction.
- 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. The monitoring time in in
MD 10120 PLC_RUNNINGUP_TIMEOUT must be checked and adapted to the first OB1
cycle.
• Establish the cause of error in the PLC (loop or stop in the user program) and eliminate.
Program Con- Switch control OFF - ON.
tinuation:
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).
Reactions: - 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 Con- Clear alarm with the Delete key or NC START.
tinuation:
2101
NCK battery alarm
Definitions: The undervoltage monitoring (2.4 - 2.6 V) of the NCK battery has responded during cyclic
operation.
Reactions: - 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 Con- Clear alarm with the Delete key or NC START.
tinuation:
2102
NCK battery alarm
Definitions: The undervoltage monitoring (2.4 - 2.6 V) of the NCK battery was detected during system
power-up.
Reactions: - 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:
2-20
SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
© Siemens AG, 2005. All rights reserved
08/2005