Spare Parts/Accessories; Dual Fan/ Battery Module; Application - Siemens SINUMERIK 840D sl Manual

Spare Parts/Accessories

11.1

Dual fan/ battery module

11.1.1

Application

Functions of the dual fan/battery module
The dual fan/battery module can perform the following tasks:
● Cooling the CPU by means of two redundant fans.
● SRAM buffering if the SuperCap is insufficient.
The Control Unit monitors the temperature inside the module and the functioning of the fan.
Fan faults are displayed and can be read out by means of the diagnostic buffer.
● Fan warning: When one of the two fans has ceased to turn.
● Fan fault: When none of the fans turn.
Fans
If natural convection is not sufficient to cool the NCU 710.2/720.2/730.1/730.2, the fans
integrated in the dual fan/battery module will be activated when required.
● After switching the NCU on, the fan will be activated for a brief period (for testing
● A temperature sensor on the NCU will switch the fan on if the air intake temperature
● The fans will be switched off when the air intake temperature falls back below approx.
● The fan is monitored during operation. In the event of a fault (stalled rotor or running too
Fans on the following Control Units run permanently:
NCU 710.1, NCU 720.1/.2 PN and NCU 730.2 PN
NCU
Manual, 07/2007, 6FC5397-0AP10-2BA0
If the software does not respond within approx. 1 minute the components are shutdown
automatically and the status is indicated by means of the red SF LED.
purposes) before turning itself off again.
exceeds approximately 40 °C.
35 °C.
slowly) a message is output.
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