Omron Q2A Series Technical Manual page 261

Code Name
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
nSE Node Setup Error
Note:
Do a Fault Reset to clear the fault.
Code Name
oC Overcurrent
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Causes
Incorrect values set in L8-93 [Lso Detect Time], L8-
94 [Lso Detect Level], and L8-95 [Lso Amount].
Causes
The H1-xx = 7E [Node Setup] terminal was
activated during run.
The drive received a Run command while the Node
Setup function was active.
Causes
The load is too heavy.
Overheating caused damage to the motor or the
motor insulation is not satisfactory.
The motor main circuit cable is contacting ground
to make a short circuit.
A short circuit or ground fault on the drive output
side caused damage to the output transistor of the
drive.
The acceleration time is too short.
The drive is trying to operate a specialized motor or
a motor that is larger than the maximum applicable
motor output of the drive.
A magnetic contactor was switched at the output.
The V/f pattern settings are incorrect.
The torque compensation gain is too large.
Electrical interference caused a problem.
The gain during overexcitation operation is too
large.
The drive received a Run command while the motor
was coasting.
The motor code is set incorrectly for PM Control
Methods.
Possible Solutions
Increase the values set in L8-93 to L8-95.
Possible Solutions
Stop the drive when the Node Setup function is in use.
Possible Solutions
• 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.
Measure the motor insulation resistance, and replace the motor if
there is electrical conduction or unserviceable insulation.
• 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.
• 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.
• 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.
• 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.
Set the operation sequence to not turn ON or OFF the magnetic
contactor while the drive is outputting voltage.
• 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.
Decrease the value set in C4-01 [Trq Comp Gain] to make sure
that the motor does not stall.
Examine the control circuit lines, main circuit lines, and ground
wiring, and decrease the effects of electrical interference.
• 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.
• 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.
• 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.
7.4 Faults
7
261