Hi,

Presently we are using a sinamics G120 (6SL3000-0BE41-3UA0)  with a line filter (6SL3000-0BE34-4AA0) to run an inclined bucket conveyor. The motor is a 125hp, 460 volts, 137 amps situated about 1200ft away from the  VFD.

I have observed a current imbalance on the incoming to the VFD of L1 - 117 amps, L2 -135 amps and L3 - 141 amps when the drive is running at rated speed (1800 rpm) at 121 amps drive output.

I know this VFD is oversized significantly for the motor it drives.

My question is, Is the VFD actually causing this imbalance in the incoming currents on the lines and how can this be explained? We have no issue with the voltage thus far.

Looking forward to hear from you.

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Split from Harmonic filter for SINAMICS G120 .

Hi,

Yes the power module part number  6SL3224-0XE41-3UA0 you mentioned is correct.

I am presently putting things in place to look at the incoming power supply in more details.

In addition, the outgoing power cable to the motor is not a shielded one. Its about 1200 ft long from where the VFD is situated, (3 core 250 mm2 cable). Can this in any way cause the current imbalance on the incoming side of the VFD.There is also no load filter in this installation. What do u think?

Regards