Start-Up And Mode Selector Switch; Dual Fan/Battery Module - Siemens SINUMERIK 840D sl Equipment Manual
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- Function manual (2184 pages) ,
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Description
3.5 Dual fan/battery module
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.
Setting during normal operation: "0"
• The lower switch (labeled PLC) is the PLC mode selector switch.
Setting during normal operation: "0"
Figure 3-5
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
or the speed is out of tolerance.
• Fan fault ⇒ alarm 2120 "NCK fan alarm type %1": if none of the fans rotate.
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.
You can find more information on the alarms in the Diagnostics Manual.
30
Startup and mode selector switch
Equipment Manual, 10/2020, 6FC5397-1EP40-6BA1
NCU 7x0.3B PN
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