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Code
Name
oL1
Motor Overload
oL2
Drive Overload
ov
Overvoltage
36
Causes
The acceleration ramp is too fast.
The drive is trying to operate a specialized motor or
a motor that is larger than the maximum applicable
motor output of the drive.
The V/f pattern settings are incorrect.
The torque compensation gain is too large.
The drive received an Up/Down command while
the motor was coasting.
The load is too heavy.
Overload occurred while running at low speed.
L1-01 [Motor Overload (oL1) Protection] is set
incorrectly.
The V/f pattern does not fit the motor qualities.
One drive is operating more than one motor.
The electronic thermal protector is operating at an
incorrect level.
The load is too large.
The acceleration/deceleration ramps or cycle times
are too fast.
The drive capacity is too small.
Overload occurred while running at low speed.
The deceleration ramp is too fast and too much
regenerative energy is flowing back into the drive.
The acceleration ramp is too fast.
The braking load is too large.
There are surge voltages in the input power supply.
The power supply voltage is too high.
YASKAWA TOMPYEULA7002A LA700 Series Installation and Operation Instruction
Possible Solutions
• Calculate the torque necessary during acceleration related to
the load inertia and the specified acceleration ramp.
• Increase the values set in C1-01, C1-03, C1-05, or C1-07
[Acceleration Ramps] to get the necessary torque.
• Increase the values set in C2-01 to C2-04 [Jerk
Characteristics] to 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 continuous rated output current is larger
than the motor rated current.
• Replace the drive with a larger capacity model.
• Examine the ratios between the V/f pattern frequency and
voltage. Decrease the voltage if it is too high compared to the
frequency.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2,
adjust E3-04 to E3-10.
Decrease the value set in C4-01 [Torque Compensation Gain] to
make sure that the motor does not stall.
Examine the sequence and input the Up/Down command after the
motor fully stops.
Decrease the load.
Note:
Reset oL1 when U4-16 [Motor oL1 Level] < 100.
• Decrease 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.
Set L1-01 as specified by the motor qualities for a drive-dedicated
motor.
• Examine the ratios between the V/f pattern frequency and
voltage. Decrease the voltage if it is too high compared to the
frequency.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
Point A Voltage] and E1-10 [Minimum Output Voltage].
Note:
If the values set in E1-08 and E1-10 are too low, the overload
tolerance will decrease at low speeds.
Set L1-01 = 0 [Motor Overload (oL1) Protection = Disabled],
connect thermal overload relay to each motor to prevent damage
to the motor.
Set E2-01 [Motor Rated Current (FLA)] correctly to the value
specified by the motor nameplate.
Decrease the load.
• Examine the acceleration/deceleration ramps and the motor
start/stop frequencies (cycle times).
• Increase the values set in C1-01 to C1-08 [Acceleration/
Deceleration Ramps].
Replace the drive with a larger capacity model.
• Decrease the load when running at low speed.
• Replace the drive with a larger capacity model.
• Increase the values set in C1-02, C1-04, C1-06, or C1-08
[Deceleration Ramps].
• Connect a dynamic braking option to the drive.
• Make sure that sudden drive acceleration does not cause the
fault.
• Increase the values set in C1-01, C1-03, C1-05, or C1-07
[Acceleration Ramps].
• Increase the value set in C2-02 [Jerk Time @ End of Accel].
Connect a dynamic braking option to the drive.
Connect a DC reactor to the drive.
Note:
If you turn the phase advancing capacitors ON and OFF and
use thyristor converters in the same power supply system,
there can be surge voltages that irregularly increase the input
voltage.
Decrease the power supply voltage to match the drive rated
voltage.
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