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Blowing Line Side Fuses


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#1 rpdodd

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Posted 19 May 2010 - 02:12 PM

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? dry.gif

#2 marke

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Posted 19 May 2010 - 06:48 PM

What size are the fuses?
Is the power to the drives being switched?

Best regards,
Mark

#3 rpdodd

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Posted 20 May 2010 - 11:13 AM

QUOTE (marke @ May 19 2010, 02:48 PM) <{POST_SNAPBACK}>
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.

QUOTE (rpdodd @ May 20 2010, 07:12 AM) <{POST_SNAPBACK}>
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.


#4 marke

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Posted 23 May 2010 - 06:12 AM

What are the drives being used?

Best regards,
Mark.




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