Random E-12 Error on 10 hp VFD at Low Load

Hi!
We are getting a random E-12 error code on one of our 10 hp 7.5kW VFDs (Link: https://www.ato.com/10hp-vfd). The drive is set to 14.9 RPM and is only drawing about 3.7–4.0 amps. It stays cool to the touch, around 90°F, so it doesn't appear to be overheating. Any suggestions? Thanks!

Thaddeus wrote:Thaddeus, this could also be related to the low RPM setting. Some VFDs don't perform well with very long acceleration or deceleration times at extremely low speeds. Try running the motor at a higher RPM to see if the fault still occurs. If it doesn't, it's likely just a tuning issue when operating at very low frequency.

Thaddeus wrote:Hi! Thaddeus,
The E-12 error usually indicates an instantaneous overcurrent during operation or a phase-to-phase short circuit in the motor circuit at the VFD output.

Please adjust the parameters as follows: set P0.22 to 2 or 3 to change the V/F curve setting, set P0.17 to 15 for the acceleration time, and set P0.18 to 15 for the deceleration time. Then run the VFD with no load and confirm whether it can operate normally up to 60 Hz.

After that, check for any short circuits in the motor or cables. Once you confirm the motor and wiring are fine, reconnect the motor to the U, V, and W terminals and test again.

If the problem persists, please provide a photo of the motor and VFD nameplate labels, along with a short video, for further analysis.

Thanks for all the advice. I'll try the parameter changes suggested by ATO.