Diagnostics & Troubleshooting 6 - 17
Auto-Tuning Faults
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. No fault or alarm outputs will occur.
Table 6.4 Auto-Tuning Fault Displays and Processing
Digital Operator
Display
Description Probable Cause Corrective Action
Er - 01
Fault
Motor Data Fault
•There is an error in the data input
for Auto-Tuning.
•There is an error in the relationship
between the motor output and the
motor rated current.
•There is an error between the no-
load current setting and the input
motor rated current (when Auto-
Tuning only line-to-line
resistance is performed for vector
control).
• Check Auto-Tuning input data (T1
parameters).
• Check Drive and motor capacity
for compatibility.
• Check motor rated current and
no-load current (E2-03 and
T1-04).
Er - 02
Minor Fault
Alarm
An alarm is detected during Auto-
Tuning.
• Check Auto-Tuning input data (T1
parameters).
• Check output/motor wiring.
• Check the load.
Er - 03
STOP key
STOP Key Input
The STOP key is pressed during
Auto-Tuning, and the Auto-Tuning is
interrupted.
–
Er - 04
Resistance
Line-to-Line Resistance Fault
Auto-Tuning is not completed within
the specified time.
The Auto-Tuning result is outside the
parameter setting range.
• Check Auto-Tuning input data (T1
parameters).
• Check motor wiring.
• If the motor and the machine are
connected, disconnect the motor
from the machine.
• For Er-08, if the setting of T1-03 is
higher than the Drive’s input
voltage, change the input voltage
setting.
Er - 05
No-Load Current
No-Load Current Fault
Er - 08
Rated Slip
Rated Slip Fault
Er - 09
Accelerate
Acceleration Fault
Detected only for rotational Auto-
Tuning.
The motor did not accelerate in the
specified time (C1-01 + 10 seconds).
• Increase C1-01 (Accel Time 1)
• Increase L7-01 and L7-02
(Forward/Reverse Torque Limits)
if they are low.
• If the motor and load are
connected, disconnect the motor
from the load.
Er - 11
Motor Speed
Motor Speed Fault
Detected only for rotational Auto-
Tuning.
The torque reference exceeded 100%
during acceleration. Detected when
A1-02 = 2 or 3 (vector control).
• Increase C1-01 (Accel Time 1)
• Check the input data [particularly
the number of PG pulses (F1-01)
and the number of motor poles
(E2-04)].
• If the motor and load are
connected, disconnect the motor
from the load.
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