Automatic Restart Function (Option L32) - Siemens SINAMICS GM150 Operating And Installation Instructions

3.6.22

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
circuit-breaker.
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
circuit-breaker.
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".
Prerequisites
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.
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.
SINAMICS GM150 6SL3815-2LN41-4AA2
Operating Instructions 04/2017
must be maintained.
Description
3.6 Description of options
63