Does the power supply cable between the Siemens soft starter and the motor need to be shielded?

Create Date: 2024-8-30 12:03:23|Source: Siemens/Siemens

For 3RW soft starters, it is sufficient to use an unshielded main loop cable between the motor and the 3RW soft starter.
Does the power supply cable between the Siemens soft starter and the motor need to be shielded?
  The main reasons are as follows:

The frequency of the power supply on the motor terminals is stabilized at 50 or 60 Hz throughout the operation of the soft starter

After the soft start is complete, the main circuit switches to an internal bypass contactor connected in parallel, and the current and voltage waveforms are perfect sine waves.

Soft starters operate with phase angle control during soft start and soft stop. Phase angle control is to achieve the purpose of step-down start by controlling the on-time of the thyristor, and harmonics are generated only at the moment when the pulse triggers the thyristor to turn on, and the duration is very short. So negligible.

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