Siemens SINAMICS G120 Operating Instructions Manual page 187

LED description
● System-Fault LED (SF)
● Ready LED (RDY)
● Bus-Failure LED (BF)
● End-state LED (ES)
● Safe Torque Off LED (STO)
● Safe Stop 1 LED (SS1)
● Safely-Limited Speed LED (SLS)
For fail-safe functions please refer to section Function.
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
The system-fault LED indicates a general system error either software or hardware
related.
The ready LED indicates whether the inverter is ready to operate by transmitting a
control-word.
This LED does not indicate whether the drive is running or not. For that purpose an OP
would be more convenient. The information of interest is the actual speed, which can be
displayed on an OP which can be easily plugged in and out at any time during operation.
The Bus-failure LED indicates if any bus failure occurred. A bus failure can be
characterised as corrupted communication (e.g. a frame of the PROFIBUS) due to
signalling problems on the bus itself.
Note that faults according to the inner data structure of the transmitted communication
frames (e.g. CRC check of PROFIsafe telegram) are not denoted as bus failure. Thus,
such failures have to be indicated by the general fault LED.
The Bus-failure LED indicates the following states:
– Bus-failure LED off: no Bus failure
– Bus-failure LED on: no connection to the DP-Master (searching for baud rate)
– Bus-failure LED flashing 0.5 Hz: I/O device is not configured or is wrongly configured
(baud rate found, no data exchange).
The end-state LED indicates if the end state of a triggered fail-safe function has been
reached
The safe torque off LED indicates the fail-safe function Safe Torque Off.
The safe stop 1 LED indicates the fail-safe function Safe Stop 1.
The safely-limited speed LED indicates the fail-safe function Safely-Limited Speed.
Service and maintenance
7.3 LED Overview
7-5