Troubleshooting
7
7.7 Auto-Tuning Errors
YASKAWA SIEPC71061753C GA500 Technical Manual 293
Code Name Causes Possible Solutions
Er-04 Line-to-Line Resistance Error
The Auto-Tuning results were not in the applicable
parameter setting range.
Auto-Tuning did not complete in a pre-set length of
time.
There is a defective motor cable or cable
connection.
• Examine and repair motor wiring.
• Disconnect the machine from the motor and do Rotational
Auto-Tuning again.
The motor nameplate data entered during Auto-
Tuning is incorrect.
• Make sure that the input motor nameplate data is correct.
• Do Auto-Tuning again and correctly set the motor nameplate
data.
Code Name Causes Possible Solutions
Er-05 No-Load Current Error
The Auto-Tuning results were not in the applicable
parameter setting range.
Auto-Tuning did not complete in a pre-set length of
time.
• Examine and repair motor wiring.
• Disconnect the machine from the motor and do Rotational
Auto-Tuning again.
The motor nameplate data entered during Auto-
Tuning is incorrect.
• Make sure that the input motor nameplate data is correct.
• Do Auto-Tuning again and correctly set the motor nameplate
data.
Rotational Auto-Tuning was done with a load that
was more than 30% of the rating connected to the
motor.
• Disconnect the machine from the motor and do Rotational
Auto-Tuning again.
• If you cannot uncouple the motor and load, make sure that the
load is less than 30% of the motor rating. If a mechanical
brake is installed in the motor, release the brake during
Rotational Auto-Tuning.
Code Name Causes Possible Solutions
Er-08 Rated Slip Error
The motor nameplate data entered during Auto-
Tuning is incorrect.
• Make sure that the input motor nameplate data is correct.
• Do Auto-Tuning again and correctly set the motor nameplate
data.
Auto-Tuning did not complete in a pre-set length of
time.
The Auto-Tuning results were not in the applicable
parameter setting range.
• Examine and repair the motor wiring.
• If the motor and machine are connected during Rotational
Auto-Tuning, decouple the motor from the machinery.
Rotational Auto-Tuning was done with a load that
was more than 30% of the rating connected to the
motor.
• Disconnect the machine from the motor and do Rotational
Auto-Tuning again.
• If you cannot uncouple the motor and load, make sure that the
load is less than 30% of the motor rating. If a mechanical
brake is installed in the motor, release the brake during
Rotational Auto-Tuning.
Code Name Causes Possible Solutions
Er-09 Acceleration Error
The motor did not accelerate for the specified
acceleration time.
1. Increase the value set in C1-01 [Acceleration Time 1].
2. Disconnect the machine from the motor and do Rotational
Auto-Tuning again.
The value of L7-01 or L7-02 [Forward/Reverse
Torque Limit] is small.
Increase the value set in L7-01 or L7-02.
Rotational Auto-Tuning was done with a load that
was more than 30% of the rating connected to the
motor.
• Disconnect the machine from the motor and do Rotational
Auto-Tuning again.
• If you cannot uncouple the motor and load, make sure that the
load is less than 30% of the motor rating. If a mechanical
brake is installed in the motor, release the brake during
Rotational Auto-Tuning.
Code Name Causes Possible Solutions
Er-10 Motor Direction Error
There is defective drive and motor wiring. Examine and repair motor wiring.
There is defective drive and encoder wiring. Examine and repair the wiring to the encoder.
The machine pulled the motor to rotate in the
opposite direction.
When the torque reference is 100% or higher, the
sign of the speed reference was opposite of the
detected speed.
Disconnect the machine from the motor and do Rotational Auto-
Tuning again.
Code Name Causes Possible Solutions
Er-11 Motor Speed Error
The torque reference during acceleration is too high
(100%).
• Increase the value set in C1-01 [Acceleration Time 1].
• Disconnect the machine from the motor and do Rotational
Auto-Tuning again.
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