Siemens SINAMICS G150 Operating Instructions Manual page 165

4.10.19 Voltage Sensing Module for determining the actual motor speed and the phase
angle (option K51)
Description
The VSM10 Voltage Sensing Module is used for acquiring the voltage characteristic on the
motor side, so that the following functions can be implemented:
● Operation of a permanent-magnet synchronous motor without encoder with the
requirement to be able to connect to a motor that is already rotating ("flying restart"
function).
● Fast flying restart of large induction motors: The time for the demagnetization of the motor
is eliminated as a result of the voltage sensing.
The terminals on the Voltage Sensing Module (-B51) are pre-assigned in the factory and
must not be changed by the customer.
When operating a permanent-magnet synchronous motor without encoder, the "Flying
restart" function must be activated with p1200.
Removing the connector jumper in the VSM10 Voltage Sensing Module
The connector jumper in terminal X530 on the lowerside of the component must be removed
if you are using the cabinet unit on a non-grounded line supply (IT system) on the Voltage
Sensing Module (VSM10).
Use two screwdrivers or a suitable tool in order to relieve the holding springs in the terminal
and then withdraw the connector jumper.
Note
False tripping caused by not removing the connection clip with a non-grounded line supply
Failure to remove the connection clip to the basic interference suppression module on a non-
grounded line supply (IT system) can cause false tripping for a sensitive IT system
monitoring.
• Remove the connection kit for a non-grounded line supply (IT system).
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A
Terminal X530 with connector jumper
4.10 Other connections
Relieve the springs and withdraw the connector
jumper
Electrical installation
165