Voltage Sensing Module - Siemens SINAMICS S120 Function Manual

Vector control

6.19 Voltage Sensing Module

6.19 Voltage Sensing Module
Function description
The Voltage Sensing Module (VSM) is required in the vector control and in U/f control for
following functions:
● Synchronization
Using the "synchronizing" function, the system is synchronized to a line supply. The function
is used in the following use cases:
– After synchronization, a motor is directly switched over to the supply system. The
– To prevent a plant standstill during maintenance work on the converter, the motor can be
For p3800 = 1, the voltage detection takes place via a VSM, which is connected to the line
phases and assigned to a Motor Module via DRIVE-CLiQ.
● Flying restart
After power ON, the "flying restart" function automatically connects a Motor Module to a
motor which may already be turning. In operation without an encoder, a search is carried out
initially for the motor speed.
For this function, a Voltage Sensing Module (VSM) is required for operation with permanent-
magnet synchronous motors. Further information on using the function with permanent-
magnet synchronous motors can be found in the SINAMICS S120 Equipment Manual
Control Units and SINAMICS S120/S150 List Manual in parameter p1200.
A VSM can be used for operation with induction motors to reduce the duration of the search
(see Chapter "Fast flying restart (Page 268)"). If only one VSM exists, it is used to acquire
the motor voltages when the "Synchronize" function is deactivated (p3800 = 0).
Topology view
The VSM is used on the encoder side for the SINAMICS S120 drives. The VSM is only used at
the Vector drive object in sensorless operating modes. The VSM is integrated into the topology
at the position of the motor encoder.
Commissioning with STARTER
Further information on commissioning the VSM can be found in the "SINAMICS S120
Commissioning Manual for Startdrive", Chapter "Adding Voltage Sensing Module VSM10".
The component number of the VSM from the current topology must be entered in parameter
p0151[0...1]. This parameter assigns the VSM data set to a VSM evaluation routine. With
parameter p0155[0...n] "Activate/deactivate Voltage Sensing Module", it is possible to activate
or deactivate the VSM explicitly as a topology component.
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connection to the line supply or the required contactor control can be realized using the
existing bypass function or a higher-level control system.
temporarily operated on the mains.
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions