Siemens SINUMERIK 840D sl Equipment 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.
Setting during normal operation: "0"
• The lower switch (labeled PLC) is the PLC mode selector switch.
Setting during normal operation: "0"
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Figure 3-5 Startup and 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.
• Bu󹪜ering 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 bu󹪜er.
• 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 󹪝nd more information on the alarms in the Diagnostics Manual.
Description
3.5 Dual fan/battery module
NCU 7x0.3B PN
30 Equipment Manual, 10/2020, 6FC5397-1EP40-6BA1

Siemens SINUMERIK 840D sl Specifications

General

Control Type	CNC
Number of Axes	Up to 31
Max Number of Channels	10
Interfaces	Ethernet, PROFIBUS, PROFINET, USB
Interpolation	5-axis interpolation
Operating Temperature	0°C to 45°C
Relative Humidity	Up to 95% (non-condensing)
Display	TFT color display, various sizes
Programming Languages	DIN/ISO
Safety Features	Safety Integrated
PLC	Integrated PLC S7-300
Drive Interface	SINAMICS S120
Data Storage	CF card, USB
Operating System	Windows-based