Motor Reactors - Siemens SINAMICS S120 Function Manual

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Motor reactors

The "Motor reactors" function is only available for vector control.

Function description

Motor reactors reduce the voltage load on the motor windings by reducing the voltage gradients

at the motor terminals that occur during converter operation. At the same time, the capacitive

charge/discharge currents that occur at the converter output when long motor cables are used

are reduced.

This function is only available for vector control.

Restrictions

The following restrictions must be taken into account when a motor reactor is used:

● The output frequency is limited:

– Booksize power units: To maximum 120 Hz.

– Blocksize and Chassis power units: To maximum 150 Hz.

● Maximum permissible motor cable lengths are limited and depend on the number of motor

reactors connected in series.

For details, see the following device manuals:

● SINAMICS S120 AC Drive

● SINAMICS S120 Booksize power units

● SINAMICS S120 air-cooled Chassis power units

● SINAMICS S120 Chassis power units, liquid-cooled

The maximum permissible pulse frequency for the motor reactor is defined as follows for the

SINAMICS power units:

● for Booksize and Blocksize power units, the single rated pulse frequency (4 kHz).

● for Chassis power units, twice the rated pulse frequency (2.5 kHz from 315 kW to 800 kW

at 400 V or 75 kW to 1200 kW at 690 V or 4 kHz to 250 kW at 400 V).

● for Chassis-2 Motor Modules, the single rated pulse frequency (2.5 kHz).

Damage to the motor reactor if the maximum pulse frequency is exceeded

Inadmissibly high pulse frequencies can damage the motor reactor.

● Do not exceed maximum permissible pulse frequency.

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Basic functions

8.6 Motor reactors