Sinamics Inverters Or Motor Modules; Operating Principle And Properties - Siemens SINAMICS G130 Engineering Manual

1.8 SINAMICS Inverters or Motor Modules

1.8.1

Operating principle and properties

Inverters or Motor Modules use the DC link voltage supplied by the rectifier or the SINAMICS Infeed to generate a
variable-voltage, variable-frequency three-phase system to supply asynchronous or synchronous motors. SINAMICS
inverters are equipped with Insulated Gate Bipolar Transistors (IGBT) as power semiconductors which operate
according to the pulse-width modulation method. For further information, please refer to section "Operating principle
of SINAMICS converters".
Inverters are integral components of the SINAMICS G130 converter Chassis units and the SINAMICS G150 and
S150 converter cabinet units. They are also available as stand-alone Motor Modules in Chassis and Cabinet Modules
format in the SINAMICS S120 modular system.
SINAMICS S120 inverter or Motor Module
The maximum achievable output voltage or motor voltage is dependent on the value of the DC link voltage V
and the method of modulation used by the inverter. In vector control mode (inverter as drive object of vector type),
space vector modulation and pulse-edge modulation can be used. When space vector modulation without
overmodulation is used, the maximum achievable motor voltage is:
The maximum motor voltage achievable with pulse-edge modulation is:
The pulse frequency of the motor-side inverters of converters SINAMICS G130, G150 and S150 and for SINAMICS
S120 Motor Modules in Chassis and Cabinet Modules format has in vector control mode (drive object of vector type)
the factory settings listed in the following table.
Line supply voltage DC Link voltage
380 V – 480 V 3AC 510 V – 720 V DC
500 V – 690 V 3AC 675 V – 1035 V DC
Pulse frequency factory settings for SINAMICS G130, G150, S150 and S120 Motor Modules (Chassis and Cabinet Modules)
For further information about
·
the permissible pulse frequency adjustment limits,
·
the interrelationships between current controller clock cycle, pulse frequency and output frequency,
·
how the pulse frequency affects various properties of the drive system,
·
the important points to note in relation to motor-side options (motor reactors, motor filters),
·
and which types of open-loop and closed-loop control are implemented in the firmware,
can be found in section "Operating principle of SINAMICS converters".
To increase the output power, up to four S120 Motor Modules can be connected in parallel. The applicable boundary
conditions are described in section "Parallel connections of converters".
SINAMICS S120 Motor Modules in Chassis and Cabinet Modules formats can also be employed as a Braking
Module (braking chopper) if a three-phase braking resistor is connected instead of a motor. For further information,
please refer to chapter "General Information about Built-in and Cabinet Units SINAMICS S120"
Fundamental Principles and System Description
V ≈ 0.70 • V
Motor max SVM
V ≈ 0.74 • V
Motor max PEM
Rated power
≤ 250 kW
≥ 315 kW
All power ratings
SINAMICS Engineering Manual – November 2015
Engineering Information
DCLink
DCLink
Rated output current
≤ 490 A
≥ 605 A
All current ratings
Ó Siemens AG
DCLink
Factory setting of
pulse frequency
2.00 kHz
1.25 kHz
1.25 kHz
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