Sensor Module SMC30 (option K50)
The SMC30 (Sensor Module Cabinet-Mounted 30) evaluates motor encoder signals. The
sensor module transfers the speed and actual position value to the Control Unit via the internal
DRIVE-CLiQ communication interface.
If an encoder fails, the mode can be switched over to "encoderless".
For more information, see document "Supplementary component descriptions".
Automatic restart function (option L32)
When the automatic restart function (option L32) is implemented, the drive is switched on again
automatically once the power has been restored after a power failure (regardless of how long
the power failure lasted). Alarms are acknowledged automatically and the drive is restarted.
Voltage Sensing Module (VSM)
With the automatic restart option, a Voltage Sensing Module VSM10 is integrated in the drive.
The VSM10 acquires the actual voltage values at the medium-voltage level upstream of the
When the medium voltage is restored after a power failure, this is detected by the open-loop/
closed-loop controllers via voltage converters when the input-side circuit-breaker has dropped
out. The voltage converters should be located at the medium-voltage level upstream of the
For safety reasons, a time limit between the power failure and the maximum permissible power
restoration time is incorporated to ensure that the drive does not restart in an uncontrolled
manner. As a further warning, an acoustic signal is output when the drive restarts.
You can find further information on the Voltage Sensing Module (VSM10) in Section
"Description of the Components".
To switch in the drive via the optional automatic restart function, the following general
conditions must be fulfilled:
● The auxiliary supplies must not fail.
● The power supply for the fans, coolant pumps, and the open-loop/closed-loop controllers
If the main infeed fails, the pulse block is initiated. The DC link is supported for a short time
using the precharge.
SINAMICS SM120 6SL38715
Operating Instructions 07/2015
must be maintained.