NCU 7x0.2
Manual, 02/2011, 6FC5397-0AP20-0BA0
101
Spare Parts/Accessories
10
10.1 Dual fan/ battery module
10.1.1 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.
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.
Fans
If natural convection is not sufficient to ensure heat dissipation for the the
NCU 710.2/720.2/730.2, 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
purposes) before turning itself off again.
● A temperature sensor on the NCU will switch the fan on if the air intake temperature
exceeds approximately 40°C.
● The fans will be switched off when the air intake temperature falls back below approx.
35°C.
● The fan is monitored during operation. In the event of a fault (stalled rotor or running too
slowly) a message is output.
Fans on the following Control Units run permanently:
NCU 720.2 PN and NCU 730.2 PN
NOTICE
The Control Unit cannot be operated without fans, i.e. the Control Unit will not power up if
the dual fan/battery module is not functioning.
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