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Blowing Line Side Fuses


rpdodd

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We have 2 cooling AC cooling towers controlled by 2 chillers that are 2 seperate redundant systems The cooling towers have 2 motor s on each . one motor on each tower is driven by a 5 hp Danfoss freq drive. These systems alternate automatically once a week. The line side fuses taht protect each drive are blowing at start up when transfer takes place. Do not know why. Thought maybe there was a back feed happening some how from the rotating of the fan that is stopping when the other is starting. Any suggestions? <_<
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What size are the fuses?

Is the power to the drives being switched?

 

Best regards,

Mark

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What size are the fuses?

Is the power to the drives being switched?

 

Best regards,

Mark

 

They are 3 phase , 480 volt , fused at 20 amp. and no the power stays on and the drive goes into sleep mode, because if needed which very rarely happens, it could be called to run.

 

They are 3 phase , 480 volt , fused at 20 amp. and no the power stays on and the drive goes into sleep mode, because if needed which very rarely happens, it could be called to run.
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What are the drives being used?

 

Best regards,

Mark.

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