oFA01 Option Unit Error:

+ Possible Cause: The option unit is not properly connected to the drive.
+ Possible Solution: Turn off the power and reconnect the option unit.

oH1 Overheating 1 (Heat Sink Overheating):

+ Possible Cause: The temperature of the heat sink has exceeded the overheating detection level.
+ Possible Solution: Check the ambient temperature. Improve air circulation inside the cabinet. Install a fan or air conditioner to cool the environment. Remove anything that generates excessive heat near the drive. Reduce the load. Reduce the current flowing to the control circuit terminal +V.

oL1 Motor Overload:

+ Possible Cause: The electrothermal sensor triggered the overload protection.
+ Possible Solution: Reduce the load. Increase acceleration and deceleration times. When the drive is overloaded at low speeds, even if operating within the nominal current limit, an overload may occur if using a general-purpose motor. Reduce the load or increase the speed. If operation at low speeds is required, increase motor capacity or use a motor specially designed to work with the drive. If the voltage for the V/f characteristics is too high, set the user-defined V/f patterns (from E1-04 to E1-10). If the wrong motor nominal current is set in E2-01, check the motor nominal current and enter the value written on the motor nameplate into the E2-01 parameter.

oL2 Drive Overload:

+ Possible Cause: The thermal sensor of the drive triggered the overload protection.
+ Possible Solution: Reduce the load. Increase acceleration and deceleration times. If the voltage for the V/f characteristics is too high, set the preset V/f pattern (from E1-04 to E1-10). If the drive capacity is too small, replace the drive with a larger model.

oL3 Over Torque Detection 1:

+ Possible Cause: The current exceeded the value set for torque detection (L6-02) for longer than the allowed time (L6-03).
+ Possible Solution: If parameter settings are not suitable for the type of load, check the settings of L6-02 and L6-03 parameters. If there is a fault on the machine side (e.g., the machine is locked), check the load condition and remove the cause of the fault.

oPr External Digital Operator Connection Error:

+ Possible Cause: The external operator is not properly connected to the drive.
+ Possible Solution: Check the connection between the operator and the drive. Replace the cable if it is damaged. Turn off the drive input power, disconnect the operator, then reconnect the operator and turn the drive input power back on.

ov Overvoltage:

+ Possible Cause: The voltage in the DC bus exceeded the overvoltage detection level.
+ Possible Solution: The deceleration time is too short, and the motor is feeding regenerative energy back to the drive. Increase the deceleration time. Install a braking resistor or dynamic braking resistor unit. Activate the stop prevention feature during deceleration. If the drive input power voltage is too high, reduce the voltage within the limits listed in the specifications. If the dynamic braking transistor is damaged, replace the drive.

PF Input Phase Loss:

+ Possible Cause: There is an open phase in the drive input power, or there is a significant voltage imbalance between phases.
+ Possible Solution: Check the wiring errors in the main circuit drive input power. Correct the wiring. If there is loose wiring in the drive input power terminals, ensure that the terminals are properly tightened. If there is excessive fluctuation in the drive input power voltage, check the drive input power voltage. If there is poor voltage balance between phases, stabilize the drive input power or disable phase loss detection. If the main circuit capacitors are worn, check the maintenance time of the capacitors (U4-05). Replace the drive.

rH Braking Resistor Overheating:

+ Possible Cause: The braking resistor protection was triggered.
+ Possible Solution: Check the load, deceleration time, and speed. Reduce the load. Increase acceleration and deceleration times (C1-01 - C1-04). Replace the braking option with a device capable of handling the discharged power. If there is excessive braking inertia, recalculate the braking load and braking power. If an appropriate braking resistor is not installed, check the specifications and conditions of the braking resistor device. Select the optimal braking resistor.

Uv1 DC Bus Undervoltage:

+ Possible Cause: One of the following occurred when the drive stopped: The voltage in the DC bus fell below the undervoltage detection level.
+ Possible Solution: If the main circuit drive input power is incorrectly connected, correct the wiring. If there is loose wiring in the drive input power terminals, ensure that there are no loose terminals. If there is a problem with the voltage in the drive input power, check the voltage. If a power outage occurred, correct the drive input power. If the internal circuits of the drive are worn, check the maintenance time of the capacitors (U4-05). Replace the drive.

If the drive input power transformer is not large enough and the voltage drops after power is turned on:

+ Possible Solution: Check the capacity of the drive input power transformer.

If the air inside the drive is too hot:

+ Possible Solution: Check the internal temperature of the drive.

If there is a problem with the CHARGE indicator:

+ Possible Solution: Replace the drive.

Uv3 Undervoltage 3 (Current Limiting Circuit Error):

+ Possible Cause: The current limiting circuit has malfunctioned.
+ Possible Solution: Turn off and on the power to the drive. Check if the error repeats. If the error continues, replace the drive. Check the performance life of the current limiting circuit using U4-06. If U4-06 exceeds 90%, replace the drive.