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How do I fix an F1 (Over Current Fault) code for a 9000X Series drive?

There are 2 kinds of over current trips and to find out which one you will need to check the sub codes in fault history. A sub code S1 is a hardware trip. A hardware trip mean the output current has exceeded 2.5-4 times the CT rating of the drive. The other kind of trip is a software trip, sub code S3. A software trip will happen .6 seconds after the drive has gone into a current limit that has brought its output freq down to 0. We will address both of these faults the same way, although normally a hardware trip indicates more of an insulation breakdown, whereas software can indicate more of a locked rotor condition. 1. The first step is to remove the motor and start the drive. If the drive trips with nothing connected the drive has failed and will have to be repair or replaced. 2. If the drive doesn’t trip please refer to the question entitled "How do I check the output of a drive with its output disconnected?". If the drive fails this test, repair or replace. 3. Insulation test the motor and the output run. If this tests alright see if the motor can be uncoupled. 4. If the drive trips on an uncoupled motor connect a test motor to the drive and see if it can run this motor. For this purpose it is nice to have the test motor be the same size as the original motor although even a small motor will tell us certain things. If you can run the drive on a known good application this works the best. If the drive trips on the test motor or known good application, repair or replace the drive. 5. If the drive can run the uncoupled motor, try to spin what the motor was coupled to by hand to make sure it is not stuck. If you can spin the application re-couple the motor and try to start it again. The most likely place for the output to short is in the motor connection box, it is not a bad idea to have these connections reinsulated as a precaution. This problem can come and go and will normally get worse over time.