Siemens SINAMICS S150 NEMA Operating Instructions Manual page 175

4.9.21 Voltage Sensing Module for acquiring the 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
If a device is operated on an ungrounded network (IT network), the connector jumper in
terminal X530 on the button of the component must be removed from 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 connector jumper on a non-grounded line supply (IT system) can
cause false tripping in case of sensitive IT network monitoring.
• On an ungrounded power network (IT power network), remove the jumper.
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
Terminal X530 with connector jumper
4.9 Additional connections
Relieve the springs and withdraw the connector
jumper
Electrical installation
173