SPI Fault refers to an input phase loss. The cause may be a loss or fluctuation in the R, S, T input phases. To resolve this, check the input power and inspect the installation cables.

SPO Fault indicates an output phase loss. There may be a loss in the U, V, W output phases (or severe asymmetry across the three phases of the load). To fix this fault, check the output cables and inspect the motor and cables.

OH1 Fault is due to rectifier overheating. The airflow channel may be blocked, or the fan could be damaged. The ambient temperature might be too high, or the system could be running under excessive load for too long. To resolve this, apply solutions for overcurrent, clean the air channel, replace the fan, reduce the ambient temperature, inspect the connections, and reconnect if necessary. Additionally, replace the power supply or power unit or main control panel.

OH2 Fault indicates overheating of the IGBT. To resolve this issue, follow overcurrent solutions, reduce the ambient temperature, and replace the necessary equipment.

EF (External Fault): The SI external fault input terminals have been triggered. To fix this, inspect the external device inputs.

CE (Communication Error): This fault indicates an incorrect baud rate setting, a communication circuit fault, an incorrect communication address, or strong interference in the communication. Solutions include setting the correct baud rate, inspecting the communication connection interface, determining the correct communication address, changing the wiring, or increasing interference prevention.

ItE (Current Detection Fault): This fault indicates that the control card connection is poor, auxiliary power is insufficient, Hall components are damaged, or the amplification circuit is abnormal. To resolve, check the connector and cables, replace the Hall components, and replace the main control panel.

tE (Auto-Tuning Fault): The motor capacity might not match the inverter capacity, or the motor's rated parameters may be set incorrectly. There could be a significant difference between standard parameters and auto-tuning results, or the auto-tuning time may have expired. Solutions include changing the inverter model, setting the rated parameters according to the motor's nameplate, unloading the motor, checking the motor connections, adjusting the parameters, and verifying that the upper limit frequency is greater than two-thirds of the rated frequency.

EEP (EEPROM Fault): There may be an error in reading/writing control parameters, or the EEPROM could be damaged. To resolve this, press the STOP/RST button to reset or replace the main control panel.

PIDE (PID Feedback Error): The PID feedback may be offline, or the PID feedback source may be lost. To fix this, check the PID feedback signal cables and the PID feedback source.

bCE (Brake Unit Fault): There may be a fault in the braking circuit or damage to the brake pipes. The external brake resistor may be insufficient. Solutions include inspecting the brake unit, replacing the brake pipe, or increasing the brake resistance.

END (Factory Set Time Expired): The inverter's actual operating time exceeds the internal set time. To resolve, contact the supplier and adjust the set operating time.

PCE (Keypad Communication Fault): The keypad may not be connected properly or may be offline. The keypad cable could be too long, or there could be strong interference, or there may be a fault in the communication circuits of the keypad or the main board. To resolve, check the keypad cable, inspect the environment for interference sources, replace the hardware, and request maintenance service.

UPE (Parameter Upload Error): The keypad may not be connected properly or could be offline. The keypad cable could be too long, or there may be strong interference, or the communication circuits of the keypad or the main board may have failed. Solutions include inspecting the environment for interference sources, replacing the hardware, and requesting maintenance service.

DNE (Parameter Download Error): The keypad may not be connected properly or could be offline. The keypad cable could be too long, or there could be strong interference. Additionally, there might be a data storage error in the keypad. To fix this, inspect the environment for interference, replace the hardware, request maintenance service, and back up the data in the keypad again.

ETH1 (Grounding Short Circuit Fault 1): The inverter output may have a short circuit to the ground, or there may be a fault in the current detection circuit. To resolve this, check whether the motor connections are normal, replace the Hall sensor, and replace the main control panel.

ETH2 (Grounding Short Circuit Fault 2): There may be a significant mismatch between the actual motor power setting and the inverter power. Solutions include resetting the motor parameters, ensuring the parameters are correct, and checking whether the motor power parameters in the P2 group are consistent with the actual motor power in use.