Application

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Sinewave filters for AC operating mechanisms

The sinewave filter is installed at the output of frequency converters and motor currents flow through the filter. The frequency converter output variables are filtered in such a way that it produces almost sinusoidal motor voltages and currents. Stray losses in the motor are reduced and the motor runs significantly quieter. If long motor cables are used, the sinewave filter also reduces the load current peaks caused by cable capacities.

EX(d) motors can be converter-fed if sinewave filter is used. If a sinewave filter is placed upstream of the Ex(d) motor at the converter, please contact us to find out more about the operating conditions.

Permissible motor cable lengths when using sinewave filters:

• 200 m shielded motor cable
• 300 m unshielded motor cable

Note on the versions Standard (Catalog LV 60):

The following generic parameters apply, which must not be exceeded:

• Maximum motor cable length 200 m, shielded cable
• Maximum motor cable length 300 m, unshielded cable
• Maximum motor cable cross-sections for performance class:
  • up to 2.2 kW/1.5 mmІ
  • > 2.2 kW ≤ 7.5 kW/2.5 mmІ
  • > 7.5 kW ≤ 11 kW/4 mmІ
  • > 11 kW ≤ 22 kW/10 mmІ
  • > 22 kW ≤ 30 kW/16 mmІ
  • > 30 kW ≤ 37 kW/25 mmІ
  • > 37 kW ≤ 50 kW/35 mmІ
  • > 50 kW ≤ 75 kW/70 mmІ
  • ≥ 75 kW ≤ 150 mmІ
• Maximum clock frequency 8 kHz
• Maximum motor frequency of output reactor 200 Hz
• Maximum motor frequency of sinewave filter 150 Hz

If these do not meet your requirements, versions in Standard modified or customized solutions are available. For more information contact "mdexx GmbH" in Bremen.
e-mail: Anfrage@mdexx.com

For other sinewave filters not found in the ordering data, please complete the "Specification sheet for customized sine wave filters" form and send it to "mdexx GmbH".