Motor Reactors - Siemens SINAMICS S120 Function Manual

Basic functions

7.6 Motor reactors

7.6 Motor reactors
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 liquid-cooled chassis power units
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 Motor Modules Chassis Innovation, the single rated pulse frequency (2.5 kHz).
NOTICE
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.
Commissioning
1. Activate the motor reactors during commissioning (p0230 = 1).
2. Enter the number of motor reactors connected in series via p0235.
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Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions