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Name
Function
DIAG
Diagnostics
SD Activity
LED
(directly on
the card slot)
Important LED states
• If all the LEDs are flashing, the PLC must be reset (general reset) via the mode selector switch
(ramp-up with the switch in the "MRES" position).
• While the NCU is ramping up, all LEDs briefly light up orange. You can carry out a detailed
diagnosis using a PG/PC and the operating software.
More information
You can find more information about the drive faults and alarms here:
• Parameter Manual (LH1) SINAMICS S120/S150
4.4.3
7-segment display
Displaying messages
It serves to output status information during commissioning, run-up and cyclical operation. The
display is visible only for opened service cover.
Load BIOS
7-segment display
NCU 1750
Equipment Manual, 10/2023, A5E45627807B AH
Status
Meaning
Everything OK.
LED lights up green
Software-related fault is pending, e.g. at PLC, HMI, Linux. Generate
the diagnostic data wit the Diag button and so contact the Hotline.
LED lights up yellow
The data backup operation initiated with the Diag button is running.
LED flashes yellow
(0.5 Hz)
HW-related tests fail, e.g. memory test during switch on.
If no change occurs after multiple switch off/on, replace the device.
LED lights up red
No SD card inserted.
LED off
Active access to SD card
LED flashes yellow
Meaning
00
Before loading the Master Boot Record (MBR)
01
Before starting the Master Boot Record (MBR) code
02
Master Boot Record (MBR) code started
03
Second stage of the boot loader started, before reading the configuration file
4.4 Operator control and display elements
Description
39
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