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

Deceleration time is too short;

Exception occurred to input voltage;

Large energy feedback;

Lack of brake units;

Dynamic brake is not enabled, and the deceleration   time is too short.

Check input power;

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

Install dynamic brake 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;

VFD 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

VFD 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 inverter module

EF

External fault

SI external fault input terminal acts

Check external device input

CE

485 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

Brake unit fault

Brake circuit fault or brake tube is   damaged;

The   resistance of external brake resistor is too small

Check the brake 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

VFD   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

VFD 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 extension card type

The two   inserted extension cards are of the same type

Users   should not insert two cards with the same type; check the type of extension   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 extension 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 extension card inserted can be supported;

Stabilize   the extension 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 extension 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 extension card inserted can be supported;

Stabilize   the extension 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 the extension 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 extension card inserted can be supported;

Stabilize   the extension 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 extension   card in card slot 1

There is   no data transmission in interfaces of card slot 1

Confirm   whether the extension card inserted can be supported;

Stabilize   the extension 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 extension   card in card slot 2

There is   no data transmission in interfaces of card slot 2

Confirm   whether the extension card inserted can be supported;

Stabilize   the extension 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 extension   card in card slot 3

There is   no data transmission in interfaces of card slot 3

Confirm   whether the extension card inserted can be supported;

Stabilize   the extension 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

PoFF

System power failure

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

Check the   grid conditions.