Troubleshooting
7
7.4 Faults
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 261
Code Name Causes Possible Solutions
Incorrect values set in L8-93 [Lso Detect Time], L8-
94 [Lso Detect Level], and L8-95 [Lso Amount].
Increase the values set in L8-93 to L8-95.
Note:
• The drive detects this fault if it detects step-out while running at low speed.
• Do a Fault Reset to clear the fault.
• LSo is a protective function that stops the motor and stops the reverse run if a motor without a motor code incorrectly detects the initial polarity. Decrease the values set in
L8-93 to L8-95 to a range in which the drive does not malfunction to quickly detect motor reversal.
Code Name Causes Possible Solutions
nSE Node Setup Error
The H1-xx = 7E [Node Setup] terminal was
activated during run.
The drive received a Run command while the Node
Setup function was active.
Stop the drive when the Node Setup function is in use.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
oC Overcurrent
The load is too heavy. • Measure the current flowing into the motor.
• Replace the drive with a larger capacity model if the current
value is more than the drive rated current.
• Decrease the load or replace with a larger drive to prevent
sudden changes in the current level.
Overheating caused damage to the motor or the
motor insulation is not satisfactory.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
The motor main circuit cable is contacting ground
to make a short circuit.
• Examine the motor main circuit cable for damage, and repair
short circuits.
• Measure the resistance between the motor main circuit cable
and the ground terminal. If there is electrical conduction,
replace the cable.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
• Make sure that there is not a short circuit in terminal B1 and
terminals U/T1, V/T2, and W/T3. Make sure that there is not a
short circuit in terminals - and terminals U/T1, V/T2, and W/
T3.
• If there is a short circuit, contact the manufacturer or your
nearest sales representative.
The acceleration time is too short. • Calculate the torque necessary during acceleration related to
the load inertia and the specified acceleration time.
• Increase the values set in C1-01 [Accel Time 1], C1-03 [Accel
Time 2], C1-05 [Accel Time 3], or C1-07 [Accel Time 4] until
you get the necessary torque.
• Increase the values set in C2-01 [Jerk@Start of Accel], C2-02
[Jerk@End of Accel], C2-03 [Jerk@Start of Decel], and C2-
04 [Jerk@End of Decel] until you get the necessary torque.
• Replace the drive with a larger capacity model.
The drive is trying to operate a specialized motor or
a motor that is larger than the maximum applicable
motor output of the drive.
• Examine the motor nameplate, the motor, and the drive to
make sure that the drive rated current is larger than the motor
rated current.
• Replace the drive with a larger capacity model.
A magnetic contactor was switched at the output. Set the operation sequence to not turn ON or OFF the magnetic
contactor while the drive is outputting voltage.
The V/f pattern settings are incorrect. • Examine the ratios between the V/f pattern frequency and
voltage. Decrease the voltage if it is too high compared to the
frequency.
• Adjust V/f Pattern Parameters E1-04 to E1-10. For motor 2,
adjust E3-04 to E3-10.
The torque compensation gain is too large. Decrease the value set in C4-01 [Trq Comp Gain] to make sure
that the motor does not stall.
Electrical interference caused a problem. Examine the control circuit lines, main circuit lines, and ground
wiring, and decrease the effects of electrical interference.
The gain during overexcitation operation is too
large.
• Find the time when the fault occurs.
• If the fault occurs at the same time as overexcitation operation,
decrease the value set in n3-13 [OverExcBr Gain] and
consider the motor flux saturation.
The drive received a Run command while the motor
was coasting.
• Examine the sequence and input the Run command after the
motor fully stops.
• Set b3-01 = 1 [SpSrch@Start Selection = Enabled] or set H1-
xx = 67, 68 [Speed Srch 1 or 2] to input speed search
commands from the MFDI terminals.
The motor code is set incorrectly for PM Control
Methods.
• Enter the correct motor code to E5-01 [PM Mot Code
Selection] as specified by the PM motor.
• For specialized motors, refer to the motor test report and set
E5: PM MOTOR SETTINGS correctly.
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