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Sine-wave filter for PM240 Power Modules, frame size FSGX

Sine-wave filters limit the rate of voltage rise (dv/dt) and the peak voltages on the motor winding. Similar to an output reactor, they enable the connection of longer motor cables.

Bearing currents are also reduced significantly. Using these filters therefore allows standard motors with standard insulation and without insulated bearings to be operated on SINAMICS. As a result, the voltage load on the motor winding is virtually identical to the load on windings of directly mains-fed motors.

Owing to the very low rates of voltage rise on the motor cable, the sine-wave filter also has a positive impact in terms of electromagnetic compatibility which means that it is not absolutely essential to use shielded cables for short motor cables to achieve the required standard of EMC.

Since the voltage applied to the motor is not pulsed, the inverter-related stray losses and additional noise in the motor are also reduced considerably and the noise level of the motor is similar to the level produced by directly mains-fed motors.

When using sine-wave filters, the following should be observed:

• Pulse frequencies of between 4В kHz and 8В kHz are permissible for rated outputs up to and including 90В kW.
  4В kHz is the only permissible pulse frequency for rated outputs of 110В kW or higher with a PM240 Power Module. Note additional current derating as compared with rated pulse frequency of 2В kHz (see derating data)
• The output frequency is limited to 150В Hz.
• Operation and commissioning may only be performed with the motor connected as the sine-wave filter is not no-load proof
• It must be ensured that the automatic pulse frequency reduction functions are also deactivated
• A derating of 5 % must be observed when a PM240 Power Module is selected.