174 YASKAWA ELECTRIC TOEP C710687 02B FSDrive-MV1000 Instructions
5.7 Auto-Tuning Fault Detection
5.7 Auto-Tuning Fault Detection
◆ Auto-Tuning Codes, Causes, and Possible Solutions
The Auto-Tuning faults are shown below. When the following faults are detected, the fault is displayed on the digital
operator and the motor coasts to a stop. Auto-Tuning faults do not trigger a contact terminal set for fault or alarm output.
An End
error (where is a numeric character) indicates that although Auto-Tuning has been completed, there is some
discrepancy in the calculations the drive made. If there is found to be no problem on checking the cause, use the tuning
value as it stands. If there is judged to be a problem, implement countermeasures and then perform Auto-Tuning again, or
set (input) the motor parameters manually.
Table 5.16 Auto-Tuning Codes, Causes, and Possible Solutions
Digital Operator Display Error Name
End1
Excessive V/f Setting (detected only during Rotational Auto-Tuning, and displayed after
Auto-Tuning is complete)
Cause Possible Solutions
The torque reference exceeded 20% during
Auto-Tuning.
• Before Auto-Tuning the drive, verify the information written on the motor nameplate and enter
that data to T1-03 through T1-05.
• Enter proper information to parameters T1-03 to T1-05 and repeat Auto-Tuning.
• If possible, disconnect the motor from the load and perform Auto-Tuning. If the load cannot be
uncoupled, use the current Auto-Tuning results.
The results from Auto-Tuning the no-load
current exceeded 80%.
Digital Operator Display Error Name
End2
Motor Iron Core Saturation Coefficient Error (detected only during Rotational Auto-Tuning and
displayed after Auto-Tuning is complete)
Cause Possible Solutions
Motor data or data entered during Auto-Tuning
was incorrect.
• Make sure the data entered to the T1 parameters match the information written on the motor
nameplate.
• Enter the correct information and restart Auto-Tuning.
Results from Auto-Tuning are outside the
parameter setting range, assigning the iron-core
saturation coefficients (E2-07 and E2-08) a
temporary value.
• Check and correct faulty motor wiring.
• Disconnect the motor from machine and perform Rotational Auto-Tuning.
Digital Operator Display Error Name
End3 Rated Current Setting Alarm (displayed after Auto-Tuning is complete)
Cause Possible Solutions
The correct current rating printed on the
nameplate was not entered into T1-04.
• Check the setting of parameter T1-04.
• Check the motor data and repeat Auto-Tuning.
Digital Operator Display Error Name
End4 Adjusted Slip Calculation Error
Cause Possible Solutions
In Stationary Auto-Tuning, the slip value
resulted in 0.2 Hz or less.
• Check the value input for T1-.
• Execute Rotational Auto-Tuning.
The slip that was calculated is outside the
allowable range.
The value after the compensation in E2-08
(Motor Iron-Core Saturation Coefficient 2)
exceeds the upper and lower limits.
The measured value of secondary resistance is
negative.
Digital Operator Display Error Name
End5 Resistance Tuning Error
Cause Possible Solutions
The calculated resistance value is outside the
allowable range.
Double-check the data entered for the Auto-Tuning process.
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