VFD Showing E-03 Overcurrent When Using Motor Controller

vivi

Total Posts: 4

Posted: 21 days ago

Hello, I have installed one of the ATO GK3000-1S0022G drives to run an 8.7 amp 1 phase motor, and I can’t get it to work. It keeps showing E-3 on the display. I’d appreciate any guidance on how to troubleshoot this.

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ATO

Total Posts: 257

Posted: 21 days ago

vivi wrote:

Hello, I have installed one of the ATO GK3000-1S0022G drives to run an 8.7 amp 1 phase motor, and I can’t get it to work. It keeps showing E-3 on the display. I’d appreciate any guidance on how to troubleshoot this.

You can try troubleshooting on your own. E-03 is “running over current at constant speed.” The possible reasons and solutions are listed in the table below.

1

ATO.com

Impellizzeri

Total Posts: 2

Posted: 21 days ago

vivi wrote:

Hello, I have installed one of the ATO GK3000-1S0022G drives to run an 8.7 amp 1 phase motor, and I can’t get it to work. It keeps showing E-3 on the display. I’d appreciate any guidance on how to troubleshoot this.

E-03 on most VFDs usually means overcurrent during operation. A couple of quick things to check: Is your motor wired correctly for the voltage? Any sudden load or mechanical binding? Acceleration time too short can also trigger this
Also, are you running the motor directly from the VFD or is there anything in between?

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vivi

Total Posts: 4

Posted: 21 days ago

Impellizzeri wrote:

Hello, I have installed one of the ATO GK3000-1S0022G drives to run an 8.7 amp 1 phase motor, and I can’t get it to work. It keeps showing E-3 on the display. I’d appreciate any guidance on how to troubleshoot this.E-03 on most VFDs usually means overcurrent during operation. A couple of quick things to check: Is your motor wired correctly for the voltage? Any sudden load or mechanical binding? Acceleration time too short can also trigger this
Also, are you running the motor directly from the VFD or is there anything in between?

Thanks for the suggestions. The wiring should be correct, and there’s no mechanical load at the moment. However, we are not running the motor directly from the VFD—there is a motor controller between them.

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vivi

Total Posts: 4

Posted: 21 days ago

ATO wrote:

Hello, I have installed one of the ATO GK3000-1S0022G drives to run an 8.7 amp 1 phase motor, and I can’t get it to work. It keeps showing E-3 on the display. I’d appreciate any guidance on how to troubleshoot this.You can try troubleshooting on your own. E-03 is “running over current at constant speed.” The possible reasons and solutions are listed in the table below.

Hello, our motor is 2kW, 230V, 60Hz single phase. But we are not directly connected to the motor. We have a 230V 50Hz power supply to the drive, then out of the drive 230V 60Hz to the motor controller, then out to the motor. I have the drive outputting 230V 60Hz, but as soon as I press start on the motor controller, it gives the E-03 fault code.

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ann

Total Posts: 1

Posted: 21 days ago

vivi wrote:

Hello, our motor is 2kW, 230V, 60Hz single phase. But we are not directly connected to the motor. We have a 230V 50Hz power supply to the drive, then out of the drive 230V 60Hz to the motor controller, then out to the motor. I have the drive outputting 230V 60Hz, but as soon as I press start on the motor controller, it gives the E-03 fault code.

That setup is likely your problem. VFDs are designed to drive motors directly, not another controller. When you put a motor controller between the VFD and the motor, it can look like a non-linear or reactive load, which can easily trigger overcurrent faults. Basically, the VFD expects a motor (inductive load), not electronics in between.

2

ATO

Total Posts: 257

Posted: 21 days ago

vivi wrote:

Hello, our motor is 2kW, 230V, 60Hz single phase. But we are not directly connected to the motor. We have a 230V 50Hz power supply to the drive, then out of the drive 230V 60Hz to the motor controller, then out to the motor. I have the drive outputting 230V 60Hz, but as soon as I press start on the motor controller, it gives the E-03 fault code.

The product you purchased is GK3000-1S0022.
The controller between the motor and the VFD may cause the E-03 fault. The VFD accepts only motor-type loads, so there should be no lights, circuit boards, or other devices between the controller and the VFD.

1

ATO.com

vivi

Total Posts: 4

Posted: 20 days ago

Got it, that makes sense now. I’ll try removing the controller and running the motor directly from the VFD to see if that clears the E-03 fault.

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