OUt1

Inverter unit Phase-U protection

Acceleration   is too fast;

IGBT   module is damaged;

Misacts   caused by interference; drive wires are poorly connected ;

To-ground   short circuit occurs

Increase   acceleration time;

Replace   the power unit;

Check   drive wires;

Check   whether there is strong interference surrounds the peripheral equipment

OUt2

Inverter unit Phase-V protection

OUt3

Inverter unit Phase-W protection

OV1

Over-voltage during acceleration

Exception occurred to input voltage;

Large energy feedback;

Lack of braking units;

Dynamic brake is not enabled

Check input power;

Check whether load deceleration time is too   short; or the motor starts during rotating;

Install dynamic braking units;

Check the setup of related function codes

OV2

Over-voltage during deceleration

OV3

Over-voltage during constant speed   running

OC1

Over-current during acceleration

Acceleration   is too fast;

Grid   voltage is too low;

Inverter   power is too small;

Load   transient or exception occurred;

To-ground   short circuit or output phase loss occur;

Strong   external interference sources;

Overvoltage   stall protection is not enabled

Increase acceleration /deceleration time;
  Check input power;
  Select the VFD with larger power;

Check if the load is short circuited (to-ground short circuit or   line-to-line short circuit) or the rotation is not smooth;

Check the output wiring;

Check if there is strong interference;

Check the setup of related function codes.

OC2

Over-current during deceleration

OC3

Over-current during constant speed   running

UV

Bus undervoltage fault

Grid voltage is too low;

Overvoltage stall protection is not enabled

Check grid input power;

Check the setup of related function codes

OL1

Motor overload

Grid voltage is too low;

Rated motor current is set improperly;

Motor stall or load jumps violently

Check grid voltage;

Reset rated motor current;

Check the load and adjust torque boost

OL2

Inverter overload

Acceleration   is too fast;

The motor in rotating is restarted;

Grid voltage is too low;

Load is too large;

Power is too small;

Increase acceleration time;

Avoid restart after stop;

Check grid voltage;

Select the VFD with larger power;

Select proper motor

SPI

Phase loss on input side

Phase loss or violent fluctuation occurred to R, S and T input

Check the input power;

Check installation wiring

SPO

Phase loss on output side

Phase loss occurred to U, V, W output (or the three phases of motor is   asymmetrical)

Check the output wiring;

Check the motor and cable

OH1

Overheat of rectifier module

Air duct   is blocked or fan is damaged;

Ambient   temperature is too high;

Long-time   overload running

Ventilate the air duct or replace the fan;

Lower the ambient temperature

OH2

Overheat of VFD module

EF

External fault

SI external fault input terminal acts

Check external device input

CE

Modbus/Modbus   TCP communication fault

Baud rate is set improperly;

Communication line fault;

Communication address error;

Communication suffers from strong interference

Set proper baud rate;

Check the wiring of communication   interfaces;

Set proper communication address;

Replace or change the wiring to enhance   anti-interference capacity

ItE

Current detection fault

Poor contact of the connector of control board;

Hall component is damaged;

Exception occurred to amplification circuit

Check the connector and re-plug;

Replace the hall component;

Replace the main control board

tE

Motor autotuning fault

Motor capacity does not match with the VFD capacity, this fault may   occur easily if the difference between them is exceeds five power classes;

Motor parameter is set improperly;

The parameters gained   from autotuning deviate sharply from the standard parameters;

Autotuning timeout

Change the VFD model, or adopt   V/F mode for control;

Set proper motor type and nameplate   parameters;

Empty the motor load and carry out   autotuning again;

Check motor wiring and parameter setup;

Check whether upper limit frequency is   larger than 2/3 of the rated frequency

EEP

EEPROM fault

R/W error occurred to the control   parameters;

EEPROM is damaged

Press STOP/RST to reset;

Replace the main control board

PIDE

PID feedback offline fault

PID feedback offline;

PID feedback source disappears;

Check PID feedback signal wires;

Check PID feedback source

bCE

Braking unit fault

Brake circuit fault or brake tube is damaged;

The resistance of external braking resistor   is too small

Check the braking unit, replace with new brake tubes;

Increase brake resistance

END

Running time is up

The actual running time of the VFD is   larger than the set running time

Ask help from the supplier, adjust the set   running time

OL3

Electronic overload fault

The VFD releases overload pre-alarm based   on the set value

Check the load   and overload pre-alarm threshold

PCE

Keypad communication fault

The keypad wire is poorly contacted or   disconnected;

The keypad wire is too long and suffers   strong interference;

Circuit fault occurred to the keypad or   communication part of the main board

Check the keypad wires to confirm whether   fault exists;

Check the surroundings to rule out   interference source;

Replace the hardware and ask for   maintenance service

UPE

Parameter upload error

The keypad wire is poorly contacted or   disconnected;

The keypad wire is too long and suffers   strong interference;

Circuit fault occurred to the keypad or   communication part of the main board

Check the surroundings to rule out   interference source;

Replace the hardware and ask for maintenance   service;

Replace the hardware and ask for   maintenance service

DNE

Parameter download error

The keypad wire is poorly contacted or   disconnected;

The keypad wire is too long and suffers   strong interference;

Data storage   error occurred to the keypad

Check the surroundings to rule out   interference source;

Replace the hardware and ask for   maintenance service;

Re-backup keypad data

ETH1

To-ground short circuit fault 1

Inverter output is short connected to the   ground;

Current detection circuit is faulty;

Actual motor power setup deviates sharply   from the VFD power

Check whether   motor wiring is proper;

Replace the hall component;

Replace the main control board;

Reset the motor parameters properly

ETH2

To-ground short circuit fault 1

Inverter output is short connected to   ground;

Current detection circuit is faulty;

Actual motor power setup deviates sharply   from the VFD power

Check whether   motor wiring is proper;

Replace the hall component;

Replace the main control board;

Reset the motor parameters properly

dEu

Speed deviation fault

Load is too heavy, or stall occurred

Check the load to ensure it is proper,   increase the detection time;

Check whether control parameters are set   properly

STo

Maladjustment fault

Control parameters of synchronous motor is   set improperly;

The parameter gained from autotuning is   inaccurate;

The VFD is not connected to motor

Check the load to ensure it is proper,

Check whether load is proper;

Check whether control parameters are set   correctly;

Increase maladjustment detection time

LL

Electronic underload fault

The VFD performs underload pre-alarm based   on the set value

Check the load and overload pre-alarm   threshold

ENC1O

Encoder offline fault

Encoder line sequence is wrong, or signal   wires are poorly connected

Check the encoder wiring

ENC1D

Encoder reversal fault

The encoder speed signal is contrary to the motor running   direction

Reset encoder direction

ENC1Z

Encoder Z pulse offline fault

Z signal wires are disconnected

Check the wiring of Z signal

OT

Motor over-temperature fault

Motor over-temperature input terminal is   valid;

Exception occurred to t temperature   detection Exception occurred to resistor;

Long-time overload running or exception   occurred

Check the wiring of motor over-temperature   input terminal (terminal function 57);

Check whether temperature sensor is proper;

Check the motor and perform maintenance on   the motor

STO

Safe torque off

Safe torque off function is enabled by   external forces

/

STL1

Exception occurred to safe circuit of channel H1

The wiring of STO is improper;

Fault occurred to external switch of STO;

Hardware fault occurred to safety circuit   of channel H1

Check whether terminal wiring of STO is   proper and firm enough;

Check whether external switch of STO can   work properly;

Replace the control board

STL2

Exception occurred to channel H2 safe circuit

The wiring of STO is improper;

Fault occurred to external switch of STO;

Hardware fault occurred to safety circuit   of channel H2

Check whether terminal wiring of STO is   proper and firm enough;

Check whether external switch of STO can   work properly;

Replace the control board

STL3

Exception occurred to channel H1 and channel H2

Hardware fault occurred to STO circuit

Replace the control board

CrCE

Safety code FLASH CRC check fault

Control board is faulty

Replace the control board

E-Err

Repetitive expansion card type

The two inserted expansion cards are of the   same type

Users should not insert two cards with the   same type; check the type of expansion card, and remove one card after power   down

ENCUV

Encoder UVW loss fault

No electric level variation occurred to UVW   signal

Check the wiring of UVW;

Encoder is damaged

F1-Er

Failed to identify the expansion card in card slot 1

There is data transmission in interfaces of   card slot 1, however, it cannot read the card type

Confirm   whether the expansion card inserted can be supported;

Stabilize the expansion   card interfaces after power down, and confirm whether fault still occurs at   next power-on;

Check whether the insertion port is   damaged, if yes, replace the insertion port after power down

F2-Er

Failed to identify the expansion card in card slot 2

There is data transmission in interfaces of   card slot 2, however, it cannot read the card type

Confirm whether the expansion card inserted   can be supported;

Stabilize the expansion   card interfaces after power down, and confirm whether fault still occurs at   next power-on;

Check whether the insertion port is   damaged, if yes, replace the insertion port after power down

F3-Er

Failed to identify the expansion card in card slot 3

There is data transmission in interfaces of   card slot 3, however, it cannot read the card type

Confirm whether the expansion card inserted   can be supported;

Stabilize the expansion   card interfaces after power down, and confirm whether fault still occurs at   next power-on;

Check whether the insertion port is   damaged, if yes, replace the insertion port after power down

C1-Er

Communication timeout occurred to the expansion card   in card slot 1

There is no data transmission in interfaces   of card slot 1

Confirm whether the expansion card inserted   can be supported;

Stabilize the expansion   card interfaces after power down, and confirm whether fault still occurs at   next power-on;

Check whether the insertion port is   damaged, if yes, replace the insertion port after power down

C2-Er

Communication timeout occurred to the expansion card   in card slot 2

There is no data transmission in interfaces   of card slot 2

Confirm whether the expansion card inserted   can be supported;

Stabilize the expansion   card interfaces after power down, and confirm whether fault still occurs at   next power-on;

Check whether the insertion port is   damaged, if yes, replace the insertion port after power down

C3-Er

Communication timeout occurred to the expansion card   in card slot 3

There is no data transmission in interfaces   of card slot 3

Confirm whether the expansion card inserted   can be supported;

Stabilize the expansion   card interfaces after power down, and confirm whether fault still occurs at   next power-on;

Check whether the insertion port is damaged,   if yes, replace the insertion port after power down

E-DP

Profibus card communication timeout fault

There is no data transmission between the   communication card and the host computer (or PLC)

Check whether the communication card wiring   is loose or dropped

E-NET

Ethernet card communication timeout fault

There is no data transmission between the   communication card and the host computer

Check whether the communication card wiring   is loose or dropped

E-CAN

CANopen card communication timeout fault

There is no data transmission between the   communication card and the host computer (or PLC)

Check whether the communication card wiring   is loose or dropped

E-PN

Profinet card communication timeout fault

There is no data transmission between the   communication card and the host computer (or PLC)

Check whether the communication card wiring   is loose or dropped

E-CAT

EtherCat card communication timeout fault

There is no data transmission between the   communication card and the host computer (or PLC)

Check whether the communication card wiring   is loose or dropped

E-BAC

BACNet card communication timeout fault

There is no data transmission between the   communication card and the host computer (or PLC)

Check whether the communication card wiring   is loose or dropped

E-DEV

DeviceNET card communication timeout fault

There is no data transmission between the   communication card and the host computer (or PLC)

Check whether the communication card wiring   is loose or dropped

ESCAN

Can master/slave communication card communication timeout   fault

There is no data transmission between the   CAN master and slave communication cards

Check whether the communication card wiring   is loose or dropped

S-Err

Master-slave synchronous CAN slave fault

Fault occurred to one of the CAN slave VFDs

Detect the CAN slave VFD and analyze the   corresponding fault cause of the VFD

E-EIP

EtherNetIP card communication timeout

No data   transferred between the communication card and upper computer (or PLC)

Check   whether the communication card cable is loosen or disconnected.

PoFF

System   power failure

The   system is powered off or the bus voltage is too low.

Check   the grid conditions.