300hp GE AF-600FP VFD Issue

[prench]

Hello,
One of my GE VFD's will be running then the current/hp/and rpm will suddenly drop then pick back up again and run normal. It does not throw a fault. Any ideas on how to trouble shoot this one?

Thanks,
Patrick

 

[OkiePC]

Sounds like an intermittent run command or speed reference. It might be errant long enough for the VFD display (assuming there is one) to show you what is dropping. Tel us the complete part number or at least the model of your VFD for better answers.