Field Service calls and Troubleshooting the GE FUJI AF-300P11 and AF-300E$ VFD

The GE Fuji  AF-300P11 and the AF-300E$ VFDs  (These drives sometimes are labeled as a Saftronics VFD) are still commonly used in many applications. EMA has performed many field service calls on the GE Fuji AF-300 units

The GE Fuji AF-300  VFDs seem to be very popular in hospitals. One of the most common issues we find occurs on restart after a power failure.

On the GE Fuji AF-300 VFD,  if power is lost to the VFD while  the run command is still made, the drive will give you an “Er6- Drive Error at Start UP” fault and WILL NOT reset until the run command goes low.

In many HVAC applications ,  this can occur during a generator test when the line voltage undergoes a temporary dip.

The  GE Fuji VFD fails on Er6 as power comes back and the customer cannot reset it with the “RESET” button on the keypad because the automation system doesn’t  cycle the run command. Like many issues, something simple like this can cause hours of headaches as one assumes the drive is bad.

Knowing why this error happens is half the battle. At one hospital in Atlanta, GA, I found the easiest way to get a critical  unit running quickly is to pull the Start/Stop relay that comes from the building automation system,  reset the fault, and then put the relay back in. Another option is to physically take the wire out of the drive’s control terminals,  reset the fault,  and land the wire again (WARNING: YOU SHOULD NEVER WORK WITH ELECTRICAL EQUIPMENT UNLESS YOU ARE QUALIFIED AND COMFORTABLE IN DOING SO).  Neither of these actions will stop it from reoccurring, but will get the unit running quickly.

To fix the problem, one option is to cycle the run command through the building automation system  if you have access to the front end via a computer. Another option is to route the GE Fuji VFD run command through a relay that drops out during a power glitch.

The Er6 fault will also occur on the GE Fuji AF300 VFD if you physically press the “STOP” button on the keypad while the run command is high, and like a power failure, the run command has to cycle low in order to reset the fault.

Of course, the easiest option to solve any problem with a VFD of any type is to call EMA. Our engineers have years of experience on all types of drives, including GE, Fuji,  and Saftronics. Call us today for information on repairs, field service, and free technical support.  Locate your nearest EMA facility on the bottom of this page, or contact us via the other methods on the right of this page.

Trey Mayfield