Voltage Sensing Module - Siemens SINAMICS S120 Function Manual
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4.22
Voltage Sensing Module
The Voltage Sensing Module (VSM) is required in the Vector Control and in V/f control for
following functions:
● Synchronizing
● Flying restart
Topology view
The VSM is used on the encoder side for 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.
VSM commissioning using STARTER
The VSM for the VECTOR drive object is selected in STARTER using the drive wizard. As
the VSM is not assigned to the encoder data sets (EDS), it cannot be selected on the
encoder side. 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.
VSM parameters are independent of the SINAMICS data set model. A maximum of two
VSMs are permitted for each VECTOR drive object.
Note
Using two VSMs
If two VSMs are connected to one Motor Module, the first VSM (p0151[0]) is used to
measure the line voltage (p3801). The motor voltage is measured (p1200) with the second
VSM.
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Using the "synchronizing" function, the system is synchronized to an existing line supply.
For example, after synchronization the motor is directly switched over to the line supply
(bypass). A further application is to temporarily operate the motor from the line supply in
order to be able to carry out maintenance work on the drive converter without switching
off the plant.
For external actual voltage sensing (p3800 = 1), the voltage is sensed using a VSM which
is connected to the line phases. The voltage values must be transferred to the
synchronization via connectors r3661 and r3662.
After switching 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.
A Voltage Sensing Module (VSM) is required for this function for permanent-magnet
synchronous motors (see SINAMICS S120 Control Units Manual).
Vector control
4.22 Voltage Sensing Module
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