Failure of the auxiliary supply
If the main infeed fails, the following possibilities are available:
● The input-side circuit breaker is still closed.
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.
● The input-side circuit breaker has tripped.
After a fixed, definable time, the circuit breaker receives an "ON" 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.
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.
8.4 Fault and system messages
8.4.1 Indicating and rectifying faults
The drive provides many protection functions. These protection functions protect the drive
against damage in a fault situation. A distinction is made between the following messages:
● Fault
A fault is a message from the drive indicating a fault or other exceptional (unwanted) state.
The cause can be a fault in the drive itself or also an external fault. This fault, for example,
could have been issued by the winding temperature monitoring of the asynchronous motor.
The faults are displayed and can be reported to a higher-level control system. Once you
have eliminated the cause of the fault, you must acknowledge the fault message.
● Alarm
An alarm is the response to a fault condition identified by the drive, that does not result in the
drive being shutdown. Alarms acknowledge themselves. If the cause is no longer present,
the alarms reset themselves automatically.
The converter indicates a fault by displaying the corresponding fault and/or alarm on the
operator panel.
Operation
8.4 Fault and system messages
SINAMICS PERFECT HARMONY GH150 6SL38253AE412AA1-Z
Operating Instructions Rev.201910281231 EXAMPLE 99
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