vfd over volts

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    • #10387
      Avatared harris
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      i have a 40ton vfd automation direct gs34040 vfd. its a 480 drive. 486/482/482 input voltage. it faults at 35 hz. i changed accel times and a few other parameters. It is on a dessicant dehumidifier. runs at 60 at 486hz all year unless there is a power blip. it will ramp up but faults on decel even though we increased decel times. fault “dc bus over voltage”. the blower is a centrifugal type fan no belts. motor checks out. the dc bus is 748 at 60 hz but it should be 687. when it decels the bus voltage goes down according to screen but the drive trips.


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