Alarm Name

Fault Descriptions

Corrective Actions

 oca

Over-current during acceleration  (Output current exceeds triple rated current during acceleration.)

1.      Short-circuit at motor output: Check for possible poor insulation at the output lines.

2.      Acceleration Time too short: Increase the Acceleration Time.

3.      AC motor drive output power is too small: Replace the AC motor drive with the next higher power model.

 ocd

Over-current during deceleration (Output current exceeds triple rated current during deceleration.)

1.      Short-circuit at motor output: Check for possible poor insulation at the output line.

2.      Deceleration Time too short: Increase the Deceleration Time.

3.      AC motor drive output power is too small: Replace the AC motor drive with the next higher power model.

 ocn

Over-current during steady state operation

(Output current exceeds triple rated current during constant speed.)

1.      Short-circuit at motor output: Check for possible poor insulation at the output line.

2.      Sudden increase in motor loading: Check for possible motor stall.

3.      AC motor drive output power is too small: Replace the AC motor drive with the next higher power model.

 oc5

Hardware failure in current detection

Return to the factory

Gff

Ground fault

When (one of) the output terminal(s) is grounded, short circuit current is more than 50% of AC motor drive rated current, the AC motor drive power module may be damaged. NOTE: The short circuit protection is provided for AC motor drive protection, not for protection of the user.

1.      Check the wiring connections between the AC motor drive and motor for possible short circuits, also to ground.

2.      Check whether the IGBT power module is damaged.

3.      Check for possible poor insulation at the output line.

occ

Short-circuit is detected between upper bridge and lower bridge of the IGBT module

Return to the factory

oca

DC BUS over-voltage during acceleration (230V: DC 450V;

460V: DC 900V)

1.       Check if the input voltage falls within the rated AC motor drive input voltage range.

2.       Check for possible voltage transients.

3.       If DC BUS over-voltage due to regenerative voltage, please increase the Deceleration Time or add an optional brake resistor.

oud

DC BUS over-voltage during deceleration (230V: DC 450V;

460V: DC 900V)

oun

DC BUS over-voltage in constant speed

(230V: DC 450V; 460V: DC 900V)

ou5

Hardware failure in voltage detection

Check if input voltage is within specification range and monitor if there is surge voltage.

Lud

DC BUS voltage is less than Pr.06-00

during acceleration

1.       Check if the input voltage is normal

2.       Check for possible sudden load

Lun

DC BUS voltage is less than Pr.06-00

during deceleration

DC BUS voltage is less than Pr.06-00 in

constant speed

PHL

Phase Loss

Check Power Source Input if all 3 input phases are connected without loose contacts.

For models 40hp and above, please check if the fuse for the AC input circuit is blown.

Oh1

IGBT overheating IGBT temperature exceeds protection level

1 to15HP: 90 ^oC

20 to 100HP: 100 ^oC

1.       Ensure that the ambient temperature falls within the specified temperature range.

2.       Make sure that the ventilation holes are not obstructed.

3.       Remove any foreign objects from the heatsinks and check for possible dirty heat sink fins.

4.       Check the fan and clean it.

5.       Provide enough spacing for adequate ventilation.

oh2

Heatsink overheating Heat sink

temperature exceeds 90^oC

1.        Ensure that the ambient temperature falls within the specified temperature range.

2.       Make sure that the ventilation holes are not obstructed.

3.       Remove any foreign objects from the heatsinks and check for possible dirty heat sink fins.

4.       Check the fan and clean it.

5.       Provide enough spacing for adequate ventilation.

oh3

Motor overheating The AC motor drive detects that the internal temperature exceeds Pr.06-30 (PTC level)

1.       Make sure that the motor is not obstructed.

2.       Ensure that the ambient temperature falls within the specified temperature range.

3.       Take the next higher power AC motor drive model.

OH1 hardware failure

Return to the factory

OH2 hardware failure

Return to the factory

Fan

Fan failure

1.       Make sure that the fan is not obstructed.

2.       Return to the factory

ol

Overload

The AC motor drive detects excessive drive output current. NOTE: The AC motor drive can withstand up to 150% of the rated current for a maximum of 60

seconds.

1.     Check whether the motor is overloaded.

2.      Take the next higher power AC motor drive model.

EoL1

Motor 1 overload

1.       Check whether the motor 1 is overloaded.

2.       Check whether the rated current of motor 1 (Pr.05-01) is suitable

3.       Take the next higher power AC motor drive model.

EoL2

Motor 2 overload

1.       Check whether the motor 2 is overloaded.

2.       Check whether the rated current of motor 2 (Pr.05-13) is suitable

3.       Take the next higher power AC motor drive model.

FuSE

Broken fuse

The fuse at DC side

is broken for 30hp and below

1.        Check whether the fuse of the transistor module is functioning well

2.        Check whether the loading side is short- circuit

ot1

Electronic Thermal Relay 1 Protection

1.       Check whether the motor is overloaded.

2.       Check whether motor rated current setting (Pr.05-01) is suitable

3.       Check electronic thermal relay function

4.       Take the next higher power AC motor drive model.

ot2

Electronic Thermal Relay 2 Protection

cF1

Internal EEPROM can not be programmed.

1.       Press “RESET” key to the factory setting

2.       Return to the factory.

cF2

Internal EEPROM can not be read.

1.       Press “RESET” key to the factory setting

2.       Return to the factory.

cd0

Hardware failure in current detection

Re-power on to try it. If fault code is still displayed on the keypad please return to the factory

cd1

U-phase error

V-phase error

W-phase error

CC (current clamp)

Re-power on to try it. If fault code is still displayed on the keypad please return to the factory

Hd1

OC hardware error

OV hardware error

GFF hardware error

AuE

Auto tuning error

1.       Check cabling between drive and motor

2.       Retry again

AFE

PID loss (ACI)

1.        Check the wiring of the PID feedback

2.        Check the PID parameters settings

PGF1

PG feedback error

Check if Pr.10-01 is set to 0 when it is PG feedback control

PG feedback loss

Check the wiring of the PG feedback

PG feedback stall

1.        Check the wiring of the PG feedback

2.        Check if the setting of PI gain and deceleration is suitable

3.        Return to the factory

PGF4

PG slip error

PGr1

Pulse input error

1.        Check the pulse wiring

2.        Return to the factory

Pulse input loss

ACE

ACI loss

1.        Check the ACI wiring

2.        Check if the ACI signal is less than 4mA

EF

External Fault

1.       Input EF (N.O.) on external terminal is closed to GND. Output U, V, W will be turned off.

2.       Give RESET command after fault has been cleared.

EF1

Emergency stop

1.       When the multi-function input terminals MI1 to MI6 are set to emergency stop, the AC motor drive stops output U, V, W and the motor coasts to stop.

2.       Press RESET after fault has been cleared.

bb

External Base Block

1.      When the external input terminal (B.B) is active, the AC motor drive output will be turned off.

2.      Deactivate the external input terminal (B.B) to operate the AC motor drive again.

Pcode

Password is locked.

Keypad will be locked. Turn the power ON after power OFF to re-enter the correct password. See Pr.00-07 and 00-08.

cE1

Illegal function code

Check if the function code is correct (function code must be 03, 06, 10, 63)

Illegal data address

Check if the communication address is correct

cE3

Illegal data value

Check if the data value exceeds max./min. value

Slave device failure

Check the connection of the Slave device

cE10

Communication time-out

Check if the wiring for the communication is correct

cP10

Keypad (KPV-CE01) communication time-out

1.         Check if the wiring for the communication is correct

2.         Check if there is any wrong with the keypad

bf

Braking resistor fault

If the fault code is still displayed on the keypad

after pressing “RESET” key, please return to the factory.

ydc

Y-connection/ Δ - connection switch error

1.        Check the wiring of the Y-connection/ Δ- connection

2.        Check the parameters settings