Motor Reactors - Siemens SINAMICS S120 Function Manual

Basic functions

7.5 Motor reactors

7.5 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.
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 Chassis Power Units
● SINAMICS S120 Liquid Cooled Chassis Power Units
NOTICE
Damage to the motor reactor through too high a pulse frequency
The maximum pulse frequency for booksize and blocksize power units is 4 kHz, for chassis
power units, double the rated pulse frequency (2.5 kHz or 4 kHz).
Commissioning
1. Activate the motor reactors during commissioning (p0230 = 1).
2. Enter the number of motor reactors connected in series via p0235.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
• p0230
• p0233
• p0235
290
Drive filter type, motor side
Power unit motor reactor
Number of motor reactors in series
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions