Start-Up And Mode Selector Switch; Dual Fan/Battery Module - Siemens SINUMERIK 840D sl Manual

3.4.5

Start-up and mode selector switch

Layout
The NCU has two coding rotary switches in the lower section of the front panel:
● The upper switch (labeled SVC/NCK) is the NCK commissioning switch.
● The lower switch (labeled PLC) is the PLC mode selector switch.
Additional references
CNC Commissioning Manual Part 1 (NCK, PLC, drive)
3.5

Dual fan/battery module

Functions of the dual fan/battery module
The dual fan/battery module has the following tasks:
● Cooling the CPU by means of two redundant fans.
● Buffering of the real time clock.
The temperature inside the NCU and the correct functioning of the fan are monitored. Fan
faults are displayed and can be read out by means of the diagnostic buffer.
● Fan alarm ⇒ alarm 2110 "NCK temperature alarm": if one of the two fans no longer rotates
● Fan fault ⇒ alarm 2120 "NCK fan alarm type %1": if none of the fans rotate.
You can find more information on the alarms in the Diagnostics Manual.
NCU 7x0.3 PN, NCU 7x0.3B PN
Manual, 06/2014, 6FC5397-1EP40-5BA1
Setting during normal operation: "0"
Setting during normal operation: "0"
Figure 3-5 Startup and mode selector switch
or the speed is out of tolerance.
If the software does not respond within approx. 1 minute, the components are shut down
automatically and the status is indicated by means of the red SF LED.
Description
3.5 Dual fan/battery module
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