What cable lengths are available between the motor and the soft starters 3RW22, 3RW30, 3RW31, 3RW34, 3RW40, 3RW44

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

3RW22 (no longer available):
What cable lengths are available between the motor and the soft starters 3RW22, 3RW30, 3RW31, 3RW34, 3RW40, 3RW44

With SIKOSTART 3RW22, the maximum permissible cable length between SIKOSTART and the motor is 200m.

3RW30xx-xAAxx 3RW30xx-xABxx, 3RW30xx-xCBxx, 3RW31xx-xCBxx (no longer available):

The maximum allowable cable length between the soft starter and the motor is 100m when using the soft starters 3RW30xx-xAAxx 3RW30xx-xABxx, 3RW30xx-xCBxx, 3RW31xx-xCBxx.

  3RW30xx-xBBxx:

The maximum allowable cable length between the soft starter and the motor is 300m when using the 3RW30xx-xBBxx.

3RW34 (no longer available):

With SIKOSTART 3RW34, the maximum allowable cable length between SIKOSTART and the motor is 300m.

  3RW40:

The maximum allowable cable length between the soft starter and the motor is 300m when using the soft starter 3RW40.

  3RW44:

The maximum allowable cable length between the soft starter and the motor is 500m when using the soft starter 3RW44.

  3RW5:

With 3RW5x, it can be up to 800m long, regardless of the type of cable.

In addition, with the 3RW5x, the cable capacitance can be up to 660 nF/km when using cables up to 1000 meters.

The voltage drop that will occur over the length of the cable used must be taken into account.

This may result in the need for equipment with higher dielectric strength.

The use of separate cables and shielded cables is permitted.

If the cable length is exceeded, the increased cable capacitance can cause problems with thyristor triggering.

The soft starter will not start because the thyristor will not be able to complete the ignition operation if the zero intersection is offset too much.

In addition, in the long run, too high cable capacitance can damage the components in the soft starter, leading to failure.
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