Hi everyone,

im building a system using sinamics S120 to control speed for tension motor . can i use power cables without shield?

And one more thing, i read in sinamic s120 module datasheet they wrote :

Max. motor cable lenght:

Shielded100 m (328 ft)

Unshielded 150 m (492 ft)

can someone explain to me why maximum length of cable with shield is shorter then unshield? i think cable with shield is better than without shield.

Thank so much for your answer.

So can i use cable without shielded for s120 ? maximum length is about 120m. Because of we are have spare cable without shield,so we are considerring to use it for saving the cost . but i really worrry about the inverter will be damage if we using it

Technology Team

Hello,

the inverter is using fast switching power semiconductors, providing a PWM voltage output to the drive. The capacity of the motor cable is higher for shielded cables and as this capacity is charged / discharged with the puls frequency of the drive, it causes additional leakage currents, the inverter must provide.

As the inverter has some limits for the current it can provide, the possible capacity of the cable is limited and so the length is shorter with shielded cables.

Hi.

Where can I find this information, link please.