Starting the drive from standstill
This function is suitable for drives with small inertia loads and load torques where the drive
can be brought to a standstill within seconds, such as pump drives with water gauges.
Starting the drive with the flying restart function
This function can also be activated as follows: The function is suitable for drives with high
inertia loads (e.g. fan drives). This function can be used to switch the drive to the motor that
is still rotating.
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.
Restriction when the drive is operated via the AOP in LOCAL mode
The automatic restart function cannot be used in conjunction with the AOP30 in LOCAL mode.
When the drive is operated in LOCAL mode, the AOP30 cancels the "ON" command to the
circuit-breaker if fault OFF1, OFF2, or OFF3 occurs.
Emergency mushroom-head pushbutton (option L45)
An Emergency mushroom-head pushbutton is installed in the cabinet door of the Control
Module. The contacts of the pushbutton are connected to the terminal strip so they can be
integrated in a protection concept of the plant site.
EMERGENCY STOP Category 0; 24 VDC (option L66) (Page 46)
Cabinet lighting in the control section (option L50)
The cabinet lighting is automatically switched on using an integrated motion detector. If the
light is switched on by the motion detector, it stays on for three minutes.
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 an "ON" command.
The system then checks the DC-link voltage.
If the DC-link voltage continues to decrease, the drive is switched off.
If the DC-link voltage increases, operation is resumed when a threshold value is exceeded.
SINAMICS SM120 6SL38715
Operating Instructions 07/2015