rpdodd Posted May 19, 2010 Report Share Posted May 19, 2010 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? Link to comment Share on other sites More sharing options...
marke Posted May 19, 2010 Report Share Posted May 19, 2010 What size are the fuses? Is the power to the drives being switched? Best regards, Mark Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
rpdodd Posted May 20, 2010 Author Report Share Posted May 20, 2010 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. Link to comment Share on other sites More sharing options...
marke Posted May 23, 2010 Report Share Posted May 23, 2010 What are the drives being used? Best regards, Mark. Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
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