Description
3.4 Operating and display elements
NCU 7x0.2
26 Manual, 02/2011, 6FC5397-0AP20-0BA0
Additional references
● You can find a detailed description of LED states during power-up in the "NCU Operating
System (IM7)" section of the Basesoftware and Operating Software Commissioning
Manual.
● For information on drive faults and alarms, see also:
SINAMICS S120/S150 List Manual (LH1)
3.4.3 RESET button
Arrangement
The RESET button is located behind the blanking cover.
Performing a reset operation
The reset operation resets the NCU and forces a new power-up. It is similar to a "Power On
Reset" except that the 24 V power supply does not have to be switched off.
3.4.4 7-segment display
Displaying messages
The 7-segment display is located behind the blanking plate of the Control Unit. It serves as a
status display during startup and performs the following tasks:
● Output of test and diagnostic messages.
● Output of status messages during booting
Critical messages
● During normal operation, "6" appears here and the dot flashes.
● An "8" indicates that the fan is defective or that the Control Unit is operating without a fan.
Additional references
Basic Software and Operating Software Commissioning Manual (IM7), Chapter "System
startup displays".
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