Use Of The Voltage Sensing Module In Vector Drives - Siemens SINAMICS S120 Function Manual

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4.19 Use of the Voltage Sensing Module in vector drives

4.19
Use of the Voltage Sensing Module in vector drives
Description
The Voltage Sensing Module (VSM) must be used for the following applications in control
types vector and V/f:
● Synchronization
● Flying restart
The VSM is used at the encoder end in SINAMICS S120 drives. In this case, it must always
be used as a substitute for the motor encoder and is therefore inserted at the motor encoder
position in the topology.
Topology view
The VSM is used on the DO VECTOR only in operating modes without encoder. For this
reason, the VSM is linked into the topology at the position at which a motor encoder would
normally be connected.
VSM commissioning using STARTER
The VSM for the DO VECTOR is selected with the drive wizard in STARTER. 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 may be used per DO VECTOR, i.e. two VSM data sets are available.
The VSM parameters of the Active Infeeds are restricted to number range 140. The VSM
parameters of the DO VECTOR are in number range 150.
170
With the "synchronization" function, the converter phase angle can be synchronized with
the line phase angle in order, for example, to switch over (bypass) directly to the mains
supply afterwards. 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 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 first for the current speed. The
search starts at the maximum speed plus 25%.
This function requires a Voltage Sensing Module (VSM) for permanent-magnet
synchronous motors (for additional information, refer to document: /GH1/ Equipment
Manual Control Units).
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions

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