Siemens SINAMICS S120 Equipment Manual page 143

Motor-side power components
5.1 Motor reactors
5.1
5.1.1 Blocksize
5.1.1.1 Description
Motor reactors reduce the voltage stress on the motor windings by reducing the voltage
gradients at the motor terminals that occur when motors are fed from drive converters. At the
same time, the capacitive re-charging currents that additionally load the output of the Power
Module when longer motor cables are used are simultaneously reduced.
The motor reactors for Power Modules 3-ph. 380 V to 480 V AC are suitable for a pulse
frequency of 4 kHz. Higher pulse frequencies are not permissible.
5.1.1.2 Safety information
Caution
The cooling clearances of 100 mm above and below the components must be observed.
Note
The connecting cables to the Power Module must be kept as short as possible (max. 5 m).
Caution
When using motor reactors that SIEMENS has not approved for SINAMICS, then these can
thermally damage the reactor.
Caution
The surface temperature of the motor reactors can exceed 80 °C.
Caution
The maximum permissible output frequency when motor reactors are used is 150 Hz.
Equipment Manual AC Drive
Manual, (GH6), 03/2006 Edition, 6SL3097-2AL00-0BP0
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5-1