How to Fix Yaskawa GA500 Error 11 (Er-11): Motor Data Error

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Staring at Er-11 on your Yaskawa GA500? This Auto-Tuning error means your motor data is mismatched. Learn how to check parameters and fix the error today.

If you are in the middle of commissioning a new Yaskawa GA500 and the keypad suddenly displays Er-11, you haven't broken the drive. This is a very specific error that happens during the Auto-Tuning process.

In the Yaskawa manual, Er-11 is a Motor Data Error. It means the drive has taken the information you typed in (Amps, Voltage, Power) and compared it to its own internal calculations, and the two don't match. Essentially, the drive thinks the motor data is "illogical."

Why Does Er-11 Happen?

When the GA500 trips on Er-11, it is usually due to one of these three "Human" errors:

  • Parameter Typos: You accidentally entered the wrong Rated Current or Rated Power (e.g., entering 50.0 Amps instead of 5.0 Amps).
  • Unit Mismatch: You entered the motor power in Horsepower (HP) when the drive was expecting Kilowatts (kW), or vice versa.
  • Drive/Motor Sizing: You are trying to tune a motor that is much smaller or much larger than the drive's capacity (VFD capacity should generally be within 2 sizes of the motor).
  • Incomplete Circuit: The motor isn't actually connected, or an output isolator is open, so the drive can't "feel" the motor windings during the tune.

Step-by-Step Troubleshooting for Er-11

1. Double-Check the Motor Nameplate

Grab a flashlight and look at the physical plate on the motor. You need to verify the following values in the T1 Parameter Group (Auto-Tuning):

  • T1-02: Motor Rated Power (Check if the drive is set to kW or HP).
  • T1-03: Motor Rated Voltage (e.g., 230V or 460V).
  • T1-04: Motor Rated Current (The FLA or Amps).
  • T1-05: Motor Base Frequency (usually 60Hz or 50Hz).
If even one of these is significantly off, the drive will calculate an impossible internal resistance and trigger Er-11.

2. Check Parameter O1-03 (Display Units)

A common mistake on Yaskawa drives is the Power unit setting.

  • Check Parameter O1-03. This determines if the drive displays power in kW (0) or HP (1).
  • If your motor nameplate says 5 HP and you enter "5" into T1-02 while the drive is in "kW" mode, the drive thinks you have a much larger motor, causing the Er-11 error.

3. Verify the Wiring (The "Output Check")

If the data is correct but you still get Er-11:

  • Ensure the wires at U/T1, V/T2, and W/T3 are tight.
  • If you have a local safety disconnect switch near the motor, make sure it is Closed. The drive must be able to send a small amount of current through the motor to complete the tuning.

4. Try "Stationary" vs. "Rotational" Tuning

If the motor is connected to a heavy load (like a gearbox or a pump), a Rotational Auto-Tune (T1-01 = 0) might fail and cause an error.

  • Try switching to Stationary Auto-Tune (T1-01 = 4). This measures the motor's electrical traits without spinning the shaft, which is often more successful for coupled loads.

How to Reset the Er-11 Error

  1. Correct the motor data in the T1 parameters.
  2. Press the RESET or BACK button to clear the error message.
  3. Restart the Auto-Tuning process from the beginning.
  4. If the error persists, check if the motor is a standard Induction motor or a Permanent Magnet motor. Using the wrong motor type in A1-02 will always cause a tuning error.

Summary

The Yaskawa GA500 Er-11 error is simply a "Logic Check." The drive is protecting itself from running with bad data that could lead to an overcurrent trip or motor damage. Verify your Nameplate Amps, check your kW vs. HP units, and make sure the wiring is solid. You'll be through Auto-Tuning in no time!

 

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