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Description
4.5 Dual fan module
Diagnostic data of Operate (Didac)
Once the NCU has run-up, during operation, you can press the DIAG button at any time. This
generates file "out_20xx-xx-xxTxx_xx_xx.7z" in directory/card/user/sinumerik/didac.
This file contains all the relevant NCU diagnostic data.
4.5
Dual fan module
Functions of the dual fan module
The dual fan module cools the CPU with two redundant fans.
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": When none of the fans turn.
If the software does not respond within approx. 1 minute, the components are shut down
automatically.
You can find more information on the alarms in the Diagnostics Manual.
Additional information on the diagnostics buffer can be found in the Basic Functions Function
Manual, see PLC signal LBP_NC.E_ATempAlarm (fan temperature alarm).
Fans
The temperature is sensed at several locations within the NCU.
If natural convection is not sufficient to ensure cooling of the NCU, the two fans in the dual fan
module are switched on automatically. The speed is controlled so that permissible temperature
limit values are maintained at the measuring points.
After switching the NCU on, the fan is activated for a brief period of time (function test) before
turning itself off again.
Note
The NCU can be operated only with an operational dual fan module.
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Equipment Manual, 01/2022, A5E45627807B AE
NCU 1750
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