Yaskawa GA800 E01 Fault — What It Means
The E01 (sometimes displayed as Er-01) fault on a Yaskawa GA800 drive indicates a motor data error detected during the Auto-Tuning process. This is not a hardware failure code. The drive has identified that the motor nameplate data you entered does not match internally or is inconsistent with the drive’s expectations. Common mismatches include motor rated power not aligning with rated current, motor no-load current (parameter E2-03) not fitting the rated current, or base frequency and base speed values that do not correspond. The drive will not complete Auto-Tuning until the data is corrected.
This fault appears when technicians are commissioning a new motor or reconfiguring an existing installation. It means the drive cannot build an accurate motor model for vector control because the input data is invalid or contradictory. You will need to verify every motor parameter entered against the actual motor nameplate and correct any errors before re-running the Auto-Tune routine.
Common Causes
- Incorrect motor nameplate entries Voltage, current, power rating (kW or HP), frequency, or speed were mis-keyed during initial setup or Auto-Tuning.
- Motor rated power and rated current mismatch The drive detects that the entered power and current values do not correspond to each other based on expected electrical relationships.
- Wrong E2-03 no-load current setting The motor no-load current parameter (E2-03) does not align with the motor’s rated current or is set outside reasonable bounds.
- Base frequency and base speed inconsistency The entered base frequency (typically 50 or 60 Hz) and the motor base speed (RPM) do not match the motor nameplate or each other.
- Drive-motor capacity mismatch The selected drive model or catalog code does not match the motor rating, creating an invalid pairing that the drive flags during tuning.
Step-by-Step Fix
- Press the RESET button on the keypad to clear the current E01 fault so you can access and edit the motor parameters.
- Write down all motor nameplate data from the actual motor label, including rated voltage, rated current, power (kW or HP), rated frequency, rated speed (RPM), and power factor if available.
- Compare every drive motor parameter against your written nameplate data, focusing on voltage, current, power, base frequency, and base speed fields in the E2 parameter group.
- Verify parameter E2-03 (motor no-load current) is set correctly and falls within a reasonable range compared to the motor’s rated full-load current.
- Confirm drive-motor compatibility by checking that the drive model and catalog code match the motor size and application, referring to the GA800 selection tables or datasheet if needed.
- Correct all mismatched or invalid parameters in the drive, then save the changes.
- Run the Auto-Tuning routine again from the drive menu so the drive can relearn the motor characteristics with the corrected data and verify the fault does not return.
Parts Often Needed
| Part | Notes |
|---|---|
| Yaskawa GA800 operator keypad | Amazon | Replacement if the keypad is damaged and preventing parameter entry or fault reset. |
| Yaskawa GA800 drive unit (correct capacity) | Amazon | Only if the installed drive model is undersized or incompatible with the motor and a different catalog model is required. |
When to Call a Pro
Call a qualified drive technician or Yaskawa-authorized service provider if the E01 fault persists after you have verified and corrected all motor nameplate data and re-run Auto-Tuning. If you are uncertain about drive-motor compatibility, do not have access to the full GA800 parameter manual for your specific model and serial number, or if the drive was recently installed and you suspect a catalog selection error, professional assistance will prevent damage and make sure proper commissioning. Also reach out to Yaskawa technical support with your drive model number, serial number, and fault history if the root cause is not clear after following these steps.