Omron Q2A-A Series Installation & Operation Instructions page 14

1 English
oL1 Motor Overload
EN 14
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.
If the drive detects the fault at start or in the low
speed range (10% or less) and n8-57 = 1 [High-
Freq Injection = Enabled] for PM Control methods,
the high frequency injection gain is too high.
The current flowing in the motor is more than the
value set in L8-27 [OverCurr Det Gain] for PM
Control.
The control method is set incorrectly for the motor.
The motor main circuit cable is too long.
Speed search does not complete at start when you
use an induction motor in EZOLV control.
The load is too heavy.
The acceleration/deceleration times or cycle times
are too short.
Overload occurred while running at low speed.
TOMPYEUOQ2A03B AC Drive Q2A Installation and Operation Instructions
• 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.
• Set E5: PM MOTOR SETTINGS correctly or do Rotational
Auto-Tuning.
• Decrease the value of n8-41 [HFI PoleDet Pgain] in 0.5 unit
increments.
Note:
Set n8-41 > 0.0 for IPM motors.
Correct the value set in L8-27.
Set A1-02 [Control Method] correctly.
Replace the drive with a larger capacity model.
When E9-01 = 0 [Motor Type Selection = IM], set b3-24 = 2
[SpSrch Method Selection = Current Det2].
Decrease the load.
Note:
Reset oL1 when U4-16 [MotorOLEstimate (oL1)] < 100.
• Examine the acceleration/deceleration times and the motor
start/stop frequencies (cycle times).
• Increase the value set in Acceleration/Deceleration Times C1-
01 to C1-08.
• Lower the load when running at low speed.
• Increase the motor speed.
• If the motor is run frequently at low speeds, replace the motor
with a larger motor or use a drive-dedicated motor.
Note:
For general-purpose motors, overload can occur while
running at low speed when operating at below the rated
current.