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Failure of the auxiliary supply
If the main infeed fails, the following possibilities are available:
● The input-side circuit breaker is still closed.
● The input-side circuit breaker has tripped.
Note
Restricted drive operation when operated via the operator panel in the LOCAL mode
The automatic restart function cannot be used in conjunction with the operator panel in the
LOCAL mode.
When operated in the LOCAL mode, the operator panel withdraws the "ON" command to the
circuit breaker if fault OFF1, OFF2 or OFF3 is active.
8.6
Fault and system messages
8.6.1
External alarms and faults
With the terminal blocks TM15/TM31, there are 24 terminals. With STARTER or SCOUT, you
can select which predefined messages are displayed and which protection devices are to be
triggered. The list of parameterized faults and alarms can be found in the List Manual in the
"Faults and alarms" section.
8.6.2
Message from the grounding switch
Switching statuses "MPGS safe ON" and "MPGS safe OFF".
The switching status of the make-proof grounding switch is indicated to the sequencer (D455
or CU320) by the messages "MPGS safe ON" and "MPGS safe OFF" via a TM15 module.
These messages are required for displaying the status and for interlocking the circuit-breaker.
SINAMICS SM150 6SL3815-7NP41-0AA1
Operating Instructions Rev.201910281301 EXAMPLE
When the medium-voltage supply system has been restored, the DC-link voltage increases.
This increase is detected by the closed-loop and open-loop controllers.
When a threshold value is exceeded, operation is resumed.
After a fixed, definable time, the circuit breaker receives a "CLOSE" command.
The system then checks the DC link voltage.
The device is switched off if the DC link voltage continues to decrease.
If the DC-link voltage increases, operation is resumed when a threshold value is exceeded.
8.6 Fault and system messages
Operation
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