Yaskawa P1000 Drive

Yaskawa P1000 Drive Fault Codes:

Fault Code and MeaningCause and Remedy
bAT

Digital Operator Battery Voltage Low
Cause: The digital operator battery is low.



Remedy: Replace the digital operator battery.
boL

Braking Transistor Overload Fault
Cause: The braking transistor reached its overload level (wrong braking resistor installed).



Remedy: Select the correct braking resistor.
bUS

Option Communication Error
Cause:

  • No signal was received from the PLC.

  • Faulty communications wiring or existing short circuit.

  • Communication data error due to noise.

  • The option card is damaged or not properly connected.




Remedy:

  • Check for faulty wiring, disconnected cables, or short circuits.

  • Counteract noise in control/main circuits; use surge absorbers if necessary.

  • Use shielded lines and ground the shield properly.

  • Install an EMC noise filter to the drive power supply input.

  • Replace the option card or reinstall it to ensure pins align properly.
CE

MEMOBUS/Modbus Communication Error
Cause:

  • Control data was not received for the CE detection time (H5-09).

  • Faulty communications wiring or short circuit.

  • Communication data error due to noise.




Remedy:

  • Check wiring for shorts or disconnections.

  • Minimize noise effects (grounding, shielded cables, separate communication wiring from power lines).

  • Use surge suppressors on other equipment (switches/relays).
CPF00 or CPF01
CPF11 to CPF14
CPF16 to CPF19

Control Circuit Error
Cause: There is a self-diagnostic error in the control circuit or connector damage.



Remedy:

  • Cycle power to the drive.

  • If the problem continues, replace the control board or the entire drive.

  • If connector is damaged, replace the operator.
CPF02

A/D Conversion Error
Cause: Control circuit is damaged (A/D conversion error occurred).



Remedy:

  • Cycle power to the drive.

  • If the problem continues, replace the control board or the entire drive.
CPF03

Control Board Connection Error
Cause:

  • There is a connection error between the control board and the drive.

  • Drive fails to operate properly due to electrical signal interference.




Remedy:

  • Turn off power and check the connection between the control board and the drive.

  • Counteract noise (shielding, grounding, surge suppressors, EMC filters).

  • If problem persists, replace control board or drive.
CPF06

EEPROM Memory Data Error
Cause:

  • There is an error in EEPROM control circuit.

  • The power supply was switched off while parameters were being saved.




Remedy:

  • Turn off power and check connection between control board and drive.

  • Reinitialize the drive (A1-03 = 2220, 3330).

  • If problem persists, replace control board or drive.
CPF07 / CPF08

Terminal Board Connection Error
Cause: There is a faulty connection between the terminal board and the control board.



Remedy:

  • Turn off power and reconnect the terminal board.

  • If problem persists, replace control board or drive.
CPF20 or CPF21

Control Circuit Error
Cause: Hardware is damaged.



Remedy:

  • Cycle power to the drive.

  • If problem continues, replace control board or entire drive.
CPF22

Hybrid IC Failure
Cause: Hybrid IC failure on the power board.



Remedy:

  • Cycle power to the drive.

  • If problem continues, replace the power board or the entire drive.
CPF23

Control Board Connection Error
Cause: Hardware is damaged (Connection error between control board and drive).



Remedy:

  • Turn off power and check connection between control board and drive.

  • If problem continues, replace control board or entire drive.
CPF24

Drive Unit Signal Fault
Cause: Hardware is damaged (Drive capacity cannot be detected correctly).



Remedy: Replace the control board or the entire drive.
CPF25

Terminal Board Not Connected
Cause: Terminal board is not connected correctly.



Remedy: Reconnect the terminal board to the connector on the drive, then cycle power.
CPF26 to CPF35
CPF40 to CPF43

Control Circuit Error / CPU Error
Cause: Hardware is damaged.



Remedy: Replace the control board or the entire drive.
E5

MECHATROLINK Watchdog Timer Error
Cause: Data has not been received from the PLC (Watchdog timed out).



Remedy: Execute DISCONNECT or ALM_CLR, then issue a CONNECT or SYNC_SET command. Refer to SI-T3 Option Manual.
EF0

Option Card External Fault
Cause: An external fault was received from the PLC and F6-03 is set to a value other than 3.



Remedy:

  • Remove the cause of the external fault.

  • Remove the external fault input from the PLC.

  • Check the PLC program and correct problems.
EF1

External Fault (input terminal S1)
Cause: External fault at multi-function input terminal S1.



Remedy: Remove the cause of the external fault and reset the fault.
EF2

External Fault (input terminal S2)
Cause: External fault at multi-function input terminal S2.



Remedy: Remove the cause of the external fault and reset the fault.
EF3 to EF8

External Fault (terminals S3 to S8)
Cause:

  • An external device tripped an alarm function.

  • Wiring is incorrect.

  • Multi-function contact input setting is incorrect (unused terminals set for External Fault).




Remedy:

  • Remove the cause of the external fault and reset the fault.

  • Properly connect signal lines to terminals.

  • Check for unused terminals set for H1-XX = 20 to 2B.
Err

EEPROM Write Error
Cause:

  • Noise has corrupted data while writing to EEPROM.

  • Hardware problem.




Remedy:

  • Press “ENTER” on the digital operator.

  • Correct parameter settings.

  • Cycle power to the drive.

  • If problem continues, replace control board or drive.
FAn

Internal Fan Fault
Cause:

  • Internal cooling fan has malfunctioned.

  • Fault detected in internal cooling fan or magnetic contactor.




Remedy:

  • Cycle power to the drive.

  • Check for fan operation and verify cumulative operation time (U4-03/U4-04).

  • Replace fan if life exceeded or damaged.

  • If fault persists, replace power board/gate drive board or entire drive.
FbH

Excessive PID Feedback
Cause:

  • Parameters (b5-36, b5-37) set inappropriately.

  • Incorrect PID feedback wiring.

  • Problem with the feedback sensor.




Remedy:

  • Check b5-36 and b5-37 settings.

  • Correct the wiring.

  • Check sensor on control side; replace if damaged.
FbL

PID Feedback Loss
Cause:

  • Parameters (b5-13, b5-14) set inappropriately.

  • Incorrect PID feedback wiring.

  • Problem with the feedback sensor.




Remedy:

  • Check b5-13 and b5-14 settings.

  • Correct the wiring.

  • Check sensor on control side; replace if damaged.
GF

Ground Fault
Cause:

  • Motor insulation is damaged.

  • Damaged motor cable creating a short circuit.

  • Excessive leakage current at drive output.

  • Drive started to run during current offset fault.

  • Hardware problem.




Remedy:

  • Check insulation resistance of the motor.

  • Check motor cable and resistance between cable and ground.

  • Reduce carrier frequency or stray capacitance.

  • Enable Speed Search at Start (b3-01 = 1).

  • If problem continues, replace control board or entire drive.
LF

Output Phase Loss
Cause:

  • Output cable disconnected.

  • Motor winding damaged.

  • Output terminal is loose.

  • Rated current of motor is less than 5% of drive rated current.

  • Output transistor damaged.

  • A single-phase motor is being used.




Remedy:

  • Check wiring and connect output cable properly.

  • Check resistance between motor lines; replace motor if needed.

  • Apply correct tightening torque to terminals.

  • Check drive selection and motor capacities.

  • The drive cannot operate a single-phase motor.

  • If problem continues, replace control board or drive.
LF2

Output Current Imbalance
One or more of the phases in the output current are lost.
Cause:


  • Phase loss has occurred on the output side of the drive.

  • Terminal wires are loose on the output side of the drive.

  • The output circuit is damaged.

  • Motor impedance or motor phases are uneven.




Remedy:


  • Check for faulty wiring or poor connections on the output side of the drive. Correct the wiring.

  • Apply the tightening torque specified in the manual to fasten the terminals (Refer to Main Circuit Wire Gauges).

  • If the problem continues, replace the control board or the entire drive. Contact Yaskawa.

  • Measure the line-to-line resistance for each motor phase. Ensure all values match. Replace the motor if necessary.
LF3

Power Unit Output Phase Loss 3
Phase loss occurred on the output side.
Cause:


  • The gate drive board in the power unit is damaged.

  • Cable to the current detection circuit in the power unit is damaged or not connected properly.

  • Cable between the output reactor and the power unit is loose or not connected.




Remedy:


  • Cycle the power supply. If the fault continues, replace the gate drive board or the entire drive.

  • Check for incorrect wiring and correct any wiring mistakes.

  • Contact Yaskawa or your nearest sales representative for instructions.
nSE

Node Setup Error
A terminal assigned to the node setup function closed during run.
Cause:

The node setup terminal closed during run, or a Run command was issued while the node setup function was active.



Remedy:


  • Stop the drive when using the node setup function.
oC

Overcurrent
Drive sensors detected an output current greater than the specified overcurrent level.
Cause:


  • Motor damaged due to overheating or insulation failure.

  • Motor cable short circuit or grounding problem.

  • Load is too heavy.

  • Acceleration/deceleration times are too short.

  • Drive operating a specialized motor or motor larger than allowed.

  • Magnetic contactor (MC) on output side turned on/off.

  • V/f setting not operating as expected.

  • Excessive torque compensation.

  • Noise interference.

  • Overexcitation gain set too high.

  • Run command applied while motor was coasting.

  • Rated output current of drive is too small.




Remedy:


  • Check insulation resistance and replace motor if needed.

  • Check motor cables, remove short circuits, check resistance to ground, replace damaged cables.

  • Measure current. Replace with larger drive if exceeding rated current. Reduce load or check for fluctuations.

  • Calculate required torque. Increase acceleration time (C1-01, C1-03). Increase S-curve (C2-01 to C2-04).

  • Check motor capacity. Ensure drive capacity >= motor nameplate capacity.

  • Set up operation sequence so MC does not trip while drive is outputting current.

  • Check voltage/frequency ratios. Set E1-04 through E1-10 properly. Lower voltage if too high relative to frequency.

  • Check torque compensation. Reduce gain (C4-01).

  • Review noise interference handling (ground wiring, control circuit lines).

  • Reduce value of n3-13 (Overexcitation Deceleration Gain).

  • Set b3-01 to 1 to enable Speed Search at Start.

  • Use a larger drive.
oFA00

Option Card Connection Error (CN5-A)
Cause:

The option card installed into port CN5-A is incompatible with the drive.



Remedy:


  • Check if the drive supports the option card to be installed. Contact Yaskawa for assistance.
oFA01

Option Card Fault (CN5-A)
Option not properly connected.
Cause:

The option card connection to port CN5-A is faulty.



Remedy:


  • Turn off power and reconnect the option card.

  • Check if the card is properly plugged and fixed.

  • Try the card in a different port (if supported). If it works elsewhere, CN5-A is damaged (replace drive/control board). If error persists, replace option card.
oFA03 to oFA06
oFA10, oFA11
oFA12 to oFA17
oFA30 to oFA43

Option Card/Connection Error (CN5-A)
Cause:

Option card or hardware is damaged.



Remedy:


  • Cycle power to the drive.

  • If problem continues, replace the control board or the entire drive. Contact Yaskawa.
oFb00

Option Card Fault (CN5-B)
Option compatibility error.
Cause:


  • Option card in CN5-B is incompatible.

  • A communication option card has been installed in option port CN5-B.




Remedy:


  • Make sure the drive supports the option card.

  • Communication option cards are only supported by port CN5-A. Move the card to CN5-A.
oFb01

Option Card Fault (CN5-B)
Option not properly connected.
Cause:

The option card connection to port CN5-B is faulty.



Remedy:


  • Turn off power and reconnect the option card.

  • Check if card is plugged in and fixed properly.

  • Test card in a different port. If card works, CN5-B is damaged. If error persists, replace card.
oFb02

Option Card Fault (CN5-B)
Same type of option card is currently connected.
Cause:


  • An option card of the same type is already installed in port CN5-A.

  • An input option card is already installed in port CN5-A.




Remedy:


  • Only one of each option card type can be installed simultaneously.

  • Install a communication option instead.
oFb03 to oFb11
oFb12 to oFb17

Option Card Error (CN5-B)
Cause:

Option card or hardware is damaged.



Remedy:


  • Cycle power to the drive.

  • If problem continues, replace the control board or the entire drive.
oFC00

Option Card Connection Error (CN5-C)
Option compatibility error.
Cause:


  • Card in CN5-C is incompatible.

  • Communication option card installed in CN5-C.




Remedy:


  • Confirm drive supports the card.

  • Communication cards are only supported by port CN5-A.
oFC01

Option Card Fault (CN5-C)
Option not properly connected.
Cause:

The option card connection to port CN5-C is faulty.



Remedy:


  • Turn off power and reconnect the card.

  • Check connections.

  • Test in different port to identify if card or port is damaged.
oFC02

Option Card Fault (CN5-C)
Same type of option card is currently connected.
Cause:

An option card of the same type (or input option) is already installed in CN5-A or CN5-B.



Remedy:


  • Only one of each option card type can be installed simultaneously.

  • Install a communication option, digital input, or analog input option as appropriate.
oFC03 to oFC11
oFC12 to oFC17

Option Card Error (CN5-C)
Cause:

Option card or hardware is damaged.



Remedy:


  • Cycle power to the drive.

  • If problem continues, replace the control board or the entire drive.
oFC50 to oFC55

Option Card Error (CN5-C)
Cause:

Option card or hardware is damaged.



Remedy:


  • Refer to the option manual for details.
oH

Heatsink Overheat
Cause:


  • Surrounding temperature is too high.

  • Load is too heavy.

  • Internal cooling fan is stopped.




Remedy:


  • Verify temperature is within specifications. Improve air circulation, install fan/AC, or remove heat sources.

  • Measure output current, decrease load, or lower carrier frequency (C6-02).

  • Replace cooling fan. After replacement, set o4-03 to 0 to reset maintenance counter.
oH1

Overheat 1 (Heatsink Overheat)
Cause:


  • Surrounding temperature is too high.

  • Load is too heavy.




Remedy:


  • Verify temperature. Improve air circulation, install fan/AC, remove heat sources.

  • Measure output current. Lower carrier frequency (C6-02) or reduce the load.
oH5

Motor Overheat (NTC Input)
Cause:

Motor has overheated.



Remedy:


  • Reduce the load.

  • Check the ambient temperature.
oL1

Motor Overload
Electronic motor overload protection tripped.
Cause:


  • Load is too heavy.

  • Cycle times too short during accel/decel.

  • General-purpose motor driven below rated speed with high load.

  • Output voltage too high.

  • Wrong motor rated current set (E2-01).

  • Base frequency set incorrectly (E1-06).

  • Electrical thermal protection/motor characteristics mismatch.

  • Motor overheated by overexcitation.

  • Speed Search parameters set incorrectly.

  • Power supply phase loss.




Remedy:


  • Reduce the load.

  • Increase acceleration/deceleration times (C1-01 to C1-04).

  • Increase motor capacity or use a motor designed for low speeds.

  • Adjust V/f pattern (E1-04 to E1-10). Reduce E1-08 and E1-10.

  • Check and enter correct motor rated current (E2-01).

  • Check and enter correct base frequency (E1-06).

  • Correct L1-01 selection or install external thermal relay.

  • Reduce excitation deceleration gain (n3-13). Set L3-04 != 4.

  • Adjust Speed Search current (b3-03) and time (b3-02). Enable estimation (b3-24 = 1).

  • Check power supply for phase loss.
oL2

Drive Overload
Cause:


  • Load is too heavy.

  • Accel/decel time too short.

  • Output voltage too high (V/f pattern).

  • Drive capacity is too small.

  • Overload at low speeds.

  • Excessive torque compensation.

  • Speed Search parameters incorrect.

  • Input phase loss.




Remedy:


  • Reduce the load.

  • Increase accel/decel times (C1-01 to C1-04).

  • Adjust V/f pattern (E1-04 to E1-10). Reduce E1-08/E1-10 but not excessively.

  • Replace drive with larger model.

  • Lower carrier frequency (C6-02) or replace with larger drive.

  • Reduce torque compensation gain (C4-01).

  • Adjust Speed Search params (b3-03, b3-02). Set b3-24 to 1.

  • Check power supply for phase loss.
oL3

Overtorque Detection 1
Cause:


  • Parameter settings not appropriate for load.

  • Fault on the machine side (e.g., machine locked up).




Remedy:


  • Check L6-02 (Level) and L6-03 (Time) settings.

  • Check the status of the load. Remove the cause of the fault.

oL4



Overtorque Detection 2
The current has exceeded the value set for Torque Detection Level 2 (L6-05) for longer than the allowable time (L6-06).


Cause:


Parameter settings are not appropriate for the load.



Remedy:



  • Check the settings of parameters L6-05 and L6-06.

oL7



High Slip Braking oL
The output frequency stayed constant for longer than the time set to n3-04 during High Slip Braking.


Cause:


Excessive load inertia; Motor is driven by the load; Something on the load side is restricting deceleration; The overload time during High Slip Braking is too short.



Remedy:



  • Reduce deceleration times in parameters C1-02 and C1-04 for applications that do not use High Slip Braking.

  • Use a braking resistor to shorten deceleration time.

  • Increase parameter n3-04 (High-slip Braking Overload Time).

  • Install a thermal relay and increase the setting of n3-04 to maximum value.

oPr



External Digital Operator Connection Fault
The external operator has been disconnected from the drive.


Cause:


External operator is not properly connected to the drive.



Remedy:



  • Check the connection between the operator and the drive.

  • Replace the cable if damaged.

  • Turn off the drive input power and disconnect the operator. Reconnect the operator and reapply drive input power.

ov



Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.


Cause:



  • Deceleration time is too short and regenerative energy is flowing from the motor into the drive.

  • Fast acceleration time causes the motor to overshoot the speed reference.

  • Excessive braking load.

  • Surge voltage entering from the drive input power.

  • Ground fault in the output circuit causes the DC bus capacitor to overcharge.

  • Improper parameters related to Speed Search.

  • Drive input power voltage is too high.

  • The braking transistor or braking resistor are wired incorrectly.

  • Drive fails to operate properly due to noise interference.

  • Load inertia is set incorrectly.

  • Motor hunting occurs.





Remedy:



  • Increase the deceleration time (C1-02 and C1-04).

  • Install a dynamic braking resistor or unit.

  • Set L3-04 to 1 to enable stall prevention during deceleration.

  • Increase acceleration time; use longer S-curves; Enable Overvoltage Suppression (L3-11 = 1).

  • Install a DC link choke.

  • Check motor wiring for ground faults.

  • Check settings for Speed Search parameters.

  • Lower drive input power voltage within limits.

  • Check braking transistor/resistor wiring.

  • Review noise interference handling.

  • Adjust load inertia ratio in L3-25.

  • Set gain for Hunting Prevention (n1-02) or adjust AFR time constant.

PF



Input Phase Loss
Drive input power has an open phase or has a large imbalance of voltage between phases.


Cause:


Phase loss in drive input power; Loose wiring in terminals; Excessive fluctuation in voltage; Poor balance between voltage phases; Main circuit capacitors are worn.



Remedy:



  • Check for wiring errors in the main circuit drive input power.

  • Ensure terminals are tightened properly to specified torque.

  • Check voltage and stabilize drive input power.

  • Check maintenance time for capacitors (U4-05) and replace if > 90%.

  • Replace control board or entire drive if input appears normal but alarm persists.

rF



Braking Resistor Fault
The resistance of the braking resistor is too low.


Cause:


The proper braking resistor option has not been installed; Or a regenerative unit is used and terminals incorrectly connected.



Remedy:



  • Select a braking resistor option that fits the drive braking transistor specification.

  • Set L8-55 to 0 to disable the braking transistor protection selection (if applicable).

rH



Braking Resistor Overheat
Braking resistor protection was triggered.


Cause:


Deceleration time too short; Duty cycle too high; Excessive braking inertia; Wrong resistor installed.



Remedy:



  • Check load, deceleration time, and speed.

  • Reduce load inertia or increase decel times.

  • Replace dynamic braking option with a larger device.

  • Check duty cycle (Max 3% when L8-01 = 1).

  • Recalculate braking load and power.

rr



Dynamic Braking Transistor
The built-in dynamic braking transistor failed.


Cause:


The braking transistor is damaged; The control circuit is damaged.



Remedy:



  • Cycle power to the drive and check for reoccurrence.

  • Replace either the control board or the entire drive.

SC



IGBT Short Circuit or Ground Fault

Cause:


IGBT fault; IGBT short circuit detection circuit fault; The drive is damaged.



Remedy:



  • Check motor wiring.

  • Turn off power, then turn on. If problem continues, contact Yaskawa.

  • Check the drive output side for short circuit or broken output transistor (B1, U/T1, V/T2, W/T3).

SEr



Too Many Speed Search Restarts

Cause:


Parameters related to Speed Search are set to wrong values; Motor is coasting in opposite direction of Run command.



Remedy:



  • Reduce detection compensation gain (b3-10).

  • Increase current level during Speed Search (b3-17).

  • Increase detection time (b3-18).

  • Set b3-14 to 1 to enable Bi-Directional Speed Search.

TdE



Time Data Error

Cause:


An error has occurred in the Real-Clock Time function of the digital operator.



Remedy:



  • Replace the digital operator.

THo



Thermistor Disconnect
Detected in models 4A0930 and 4A1200.


Cause:


The motor thermistor is not connected properly.



Remedy:



  • Check the thermistor wiring.

TIM



Time Not Set

Cause:


Real-Time Clock not set (New drive, or o4-17 was reset); Battery low or replaced; Hardware error.



Remedy:



  • Set o4-17 to 1 to set the time.

  • Cycle power and set the clock within 30 seconds.

  • Replace digital operator battery and set Real-Time Clock.

  • If error persists, replace digital operator.

UL3



Undertorque Detection 1

Cause:


Parameter settings are not appropriate for the load; Fault on the machine side.



Remedy:



  • Check the settings of parameters L6-02 and L6-03.

  • Check the load for any problems.

UL4



Undertorque Detection 2

Cause:


Parameter settings are not appropriate for the load; Fault on the machine side.



Remedy:



  • Check L6-05 and L6-06 settings.

  • Check the load for any problems.

UL6



Motor Underload

Cause:


The output current has fallen below the motor underload curve defined in L6-14.



Remedy:



  • Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal operation.

UnbC



Current Unbalance

Cause:


The internal current sensor has detected a current unbalance situation.



Remedy:



  • Check wiring.

  • Check for damaged transistors.

  • Check for short circuits or grounding problems on the connected motor.

Uv1



DC Bus Undervoltage

Cause:


Input phase loss; Loose wiring terminals; Problem with drive input power voltage; Power interrupted; Main circuit capacitors worn; Soft-charge relay damaged.



Remedy:



  • Check main circuit input power wiring.

  • Tighten terminals to specified torque.

  • Check voltage is within range.

  • Check capacitor maintenance time (U4-05).

  • Cycle power; if fault reoccurs replace control board or drive.

Uv2



Control Power Supply Voltage Fault

Cause:


Voltage too low for control drive input power; L2-02 changed without Ride-Thru unit; Wiring damaged; Internal circuitry damaged.



Remedy:



  • Correct L2-02 setting or install Momentary Power Loss Ride-Thru unit.

  • Cycle power; if problem continues replace control board or drive.

Uv3



Undervoltage 3 (Soft-Charge Bypass Relay Fault)

Cause:


The relay or contactor on the soft-charge bypass relay is damaged.



Remedy:



  • Cycle power to the drive and see if fault reoccurs.

  • Check monitor U4-06.

  • Replace control board or entire drive if U4-06 > 90%.

Uv4



Gate Drive Board Undervoltage

Cause:


Not enough power is being supplied to the gate drive board.



Remedy:



  • Cycle power to the drive and see if fault reoccurs.

  • If problem continues, replace gate drive board or entire drive.

voF



Output Voltage Detection Fault

Cause:


Hardware damaged; Internal drive module MC/FAN overheat protection circuit due to abnormal ambient operating power.



Remedy:



  • Lower ambient temperature.

  • Replace control board or entire drive.

vToL



VT Overload

Cause:


The output current of the drive has been elevated for a set length of time.



Remedy:



  • The application may not be suited for the drive.

  • The drive is undersized for the load.
AEr
Station Address Setting Error (CC-Link, CANopen, MECHATROLINK)
Cause: Station number is set outside the possible setting range.


Remedy:

  • Set parameter F6-10 to the proper value when using a CC-Link option.

  • Set parameter F6-35 to the proper value when using a CANopen option.
bb
Baseblock
Cause: External baseblock signal was entered via one of the multi-function input terminals (S1 to S8).


Remedy:

  • Check external sequence and baseblock signal input timing.

  • Note: Baseblock alarm “bb” will not activate a digital output programmed for minor fault H2-XX = 10. Set H2-XX = 8 or 1B to activate a digital output for “bb”.
boL
Braking Transistor Overload Fault
Cause:

  • The proper braking resistor has not been installed.

  • Using a regen converter/unit but internal protection is on.

  • The use rate of the braking transistor is high.

  • The braking transistor inside the drive is faulty.




Remedy:

  • Select the proper braking resistor.

  • Set L8-55 to 0 to disable Internal Braking Transistor Protection (if using external regen unit).

  • Change to a CDBR type braking unit.

  • Change to a regen converter.

  • Increase the deceleration time.

  • Replace the drive.
bUS
Option Communication Error
Cause:

  • Connection is broken or master controller stopped communicating.

  • Option is damaged.

  • The option is not properly connected to the drive.

  • A data error occurred due to noise.




Remedy:

  • Check for faulty wiring, disconnected cables, and short circuits. Repair as needed.

  • If there are no problems with wiring and fault persists, replace the option.

  • Ensure connector pins on the option are properly lined up with the drive; reinstall option.

  • Take steps to counteract noise in control/main circuit wiring and ground wiring.

  • Use recommended shielded lines and separate communication wiring from drive power lines.

  • Install an EMC noise filter to the drive input power.
CALL
Serial Communication Transmission Error
Cause:

  • Communications wiring is faulty, short circuit, or disconnected.

  • Programming error on the master side.

  • Communications circuitry is damaged.

  • Termination resistor setting is incorrect.




Remedy:

  • Check for wiring errors and correct them.

  • Check communications at start-up and correct programming errors.

  • Perform a self-diagnostics check. If the problem continues, replace the control board or entire drive.

  • Install a termination resistor at both ends of the communication line. Set the internal termination resistor switch correctly on slave drives.
CE
MEMOBUS/Modbus Communication Error
Cause:

  • A data error occurred due to noise.

  • Communication protocol is incompatible.

  • The CE detection time (H5-09) is set shorter than the communication cycle time.

  • Incompatible PLC software settings or hardware problem.

  • Communications cable is disconnected or damaged.




Remedy:

  • Minimize noise effects: use surge absorbers, shielded lines, and separate wiring.

  • Check H5 parameter settings and protocol settings in the controller.

  • Set a longer CE detection time using parameter H5-09.

  • Check the PLC software settings and remove the cause of the error on the controller side.

  • Check the connector for signals or replace the communications cable.
CrST
Cannot Reset
Cause: Fault reset was being executed when a Run command was entered.


Remedy:

  • Ensure that a Run command cannot be entered from the external terminals or option during fault reset.

  • Turn off the Run command.
dnE
Drive Disabled
Cause: “Drive Enable” is set to a multi-function contact input (H1-XX = 6A) and that signal was switched off.


Remedy:

  • Check the operation sequence.
EF
Forward/Reverse Run Command Input Error
Cause: Sequence error (Both forward run and reverse run closed simultaneously for longer than 0.5 s).


Remedy:

  • Check the forward and reverse command sequence and correct the problem.

  • Note: When minor fault EF is detected, motor ramps to stop.
EF0
Option Card External Fault
Cause:

  • An external fault was received from the PLC with F6-03 set to 3.

  • There is a problem with the PLC program.




Remedy:

  • Remove the cause of the external fault.

  • Remove the external fault input from the PLC.

  • Check the PLC program and correct problems.
EF1 to EF8
External Fault (Input Terminal S1 to S8)
Cause:

  • An external device has tripped an alarm function.

  • Wiring is incorrect.

  • Multi-function contact inputs are set incorrectly.




Remedy:

  • Remove the cause of the external fault and reset the multi-function input value.

  • Ensure signal lines are connected properly to terminals assigned for external fault detection (H1-XX = 2C to 2F).

  • Reconnect the signal line.

  • Check if unused terminals have been set for External Fault. Change terminal settings if necessary.
EoF
Emergency Override Forward Run
Cause: The multi-function digital input for EmergOverrideFWD (H1-XX = AF) has been closed.


Remedy:

  • Open H1-XX = AF if the emergency condition is no longer present.
Eor
Emergency Override Reverse Run
Cause: The multi-function digital input for EmergOverrideREV (H1-XX = B0) has been closed.


Remedy:

  • Open H1-XX = B0 if the emergency condition is no longer present.
FbH
Excessive PID Feedback
Cause:

  • Parameter settings for b5-36 and b5-37 are incorrect.

  • PID feedback wiring is faulty.

  • Feedback sensor has malfunctioned.

  • Feedback input circuit is damaged.




Remedy:

  • Check parameters b5-36 and b5-37.

  • Correct the wiring.

  • Check the sensor and replace it if damaged.

  • Replace either the control board or the entire drive.
FbL
PID Feedback Loss
Cause:

  • Parameter settings for b5-13 and b5-14 are incorrect.

  • PID feedback wiring is faulty.

  • Feedback sensor has malfunctioned.

  • Feedback input circuit is damaged.




Remedy:

  • Check parameters b5-13 and b5-14.

  • Correct the wiring.

  • Check the sensor and replace it if damaged.

  • Replace either the control board or the entire drive.
HCA
Current Alarm
Cause:

  • Load is too heavy.

  • Acceleration and deceleration times are too short.

  • A special-purpose motor is being used, or drive capacity is mismatched.

  • Current level increased due to Speed Search.




Remedy:

  • Reduce the load for applications with repetitive operations.

  • Calculate torque required; increase accel/decel times (C1-01 through C1-04).

  • Increase the capacity of the drive.

  • Check motor capacity and ensure it is within allowable range.

  • (For Speed Search) The alarm appears briefly; no action needed.
ILIM
Current Limit Foldback
Cause: Excessive load.


Remedy:

  • Reduce the load or replace the drive with a higher capacity drive.
LT-1
Cooling Fan Maintenance Time
Cause: The cooling fan has reached 90% of its expected performance life.


Remedy:

  • Replace the cooling fan and set o4-03 to 0 to reset the Maintenance Monitor.
LT-2

Capacitor Maintenance Time
Cause: The main circuit and control circuit capacitors have reached 90% of their expected performance lives.


Remedy:

  • Replace the drive.
LT-3

Soft Charge Bypass Relay Maintenance Time
Cause: The DC bus soft charge relay has reached 90% of expected performance life.


Remedy:

  • Replace the drive.
LT-4

IGBT Maintenance Time (50%)
Cause: IGBTs have reached 50% of their expected performance life.


Remedy:

  • Check the load, carrier frequency, and output frequency.
oH

Heatsink Overheat
Cause: Surrounding temperature is too high.


Remedy:

  • Check the surrounding temperature.

  • Improve the air circulation within the enclosure panel.

  • Install a fan or air conditioner to cool surrounding area.

  • Remove anything near drive that may cause extra heat.



Cause: Internal cooling fan has stopped.


Remedy:

  • Replace the cooling fan.

  • After replacing the drive, set parameter o4-03 to 0 to reset the cooling fan operation time.



Cause: Airflow around the drive is restricted.


Remedy:

  • Provide proper installation space around the drive as indicated in the manual.

  • Allow for the proper space and ensure that there is sufficient circulation around the control panel.

  • Check for dust or other foreign materials clogging the cooling fan.

  • Clear debris caught in the fan that restricts air circulation.
oH2

Heatsink Overheat Warning
Cause: An external device triggered an overheat warning in the drive.


Remedy:

  • Search for the device that tripped the overheat warning. Remove the cause of the problem.
oH3

Motor Overheat
Cause: Motor thermostat wiring is faulty (PTC input).


Remedy:

  • Repair the PTC input wiring.



Cause: There is a fault on the machine side (e.g., the machine is locked up).


Remedy:

  • Check the status of the machine.

  • Remove the cause of the fault.



Cause: Motor has overheated.


Remedy:

  • Check the load size, accel/decel times, and cycle times.

  • Decrease the load.

  • Increase accel and decel times (C1-01 to C1-04).

  • Adjust the preset V/f pattern (E1-04 through E1-10). This involves reducing E1-08 and E1-10.

  • Check the motor-rated current.

  • Enter motor-rated current on motor nameplate (E2-01).

  • Ensure the motor cooling system is operating normally.

  • Repair or replace the motor cooling system.
oH4

Motor Overheat Fault (PTC Input)
Cause: Motor has overheated (Signal to analog input exceeded fault detection level).


Remedy:

  • Check the size of the load, the accel/decel times, and the cycle times.

  • Decrease the load.

  • Increase the acceleration and deceleration times (C1-01 through C1-04).

  • Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10.

  • Check the motor rated current.

  • Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate.

  • Ensure the motor cooling system is operating normally.

  • Repair or replace the motor cooling system.
ov

DC Bus Overvoltage
Cause: Surge voltage present in the drive input power.


Remedy:

  • Install a DC link choke or an AC reactor.



Cause: The motor is short-circuited / Ground current has overcharged the main circuit capacitors.


Remedy:

  • Check the motor power cable, relay terminals and motor terminal box for short circuits.

  • Correct grounding shorts and turn the power back on.



Cause: Noise interference causes the drive to operate incorrectly.


Remedy:

  • Review possible solutions for handling noise interference.

  • Check control circuit lines, main circuit lines and ground wiring.

  • If the magnetic contactor is identified as a source of noise, install a surge protector to the MC coil.

  • Set number of fault restarts (L5-01) to a value other than 0.
PASS

MEMOBUS/Modbus Comm. Test Mode Complete
Cause: MEMOBUS/Modbus test has finished normally.


Remedy:

  • This verifies that the test was successful.
rUn

Motor Switch during Run
Cause: A motor switch command was entered during run.


Remedy:

  • Change the operation pattern so that the motor switch command is entered while the drive is stopped.
SE

MEMOBUS/Modbus Communication Test Mode Error
Cause: A digital input set to 67H (MEMOBUS/Modbus test) was closed while the drive was running.


Remedy:

  • Stop the drive and run the test again.
TrPC

IGBT Maintenance Time (90%)
Cause: IGBTs have reached 90% of their expected performance life.


Remedy:

  • Replace the drive.
Uv

Undervoltage
Cause: Phase loss in the drive input power.


Remedy:

  • Check for wiring errors in the main circuit drive input power. Correct the wiring.



Cause: Loose wiring in the drive input power terminals.


Remedy:

  • Ensure the terminals have been properly tightened.

  • Apply the tightening torque to the terminals as specified.



Cause: There is a problem with the drive input power voltage.


Remedy:

  • Check the voltage.

  • Lower the voltage of the drive input power so that it is within the limits listed in the specifications.



Cause: Drive internal circuitry is worn.


Remedy:

  • Check the maintenance time for the capacitors (U4-05).

  • Replace either the control board or the entire drive if U4-05 exceeds 90%.



Cause: The drive input power transformer is too small and voltage drops when the power is switched on.


Remedy:

  • Check for an alarm when the magnetic contactor, line breaker, and leakage breaker are closed.

  • Check the capacity of the drive input power transformer.



Cause: Air inside the drive is too hot.


Remedy:

  • Check the temperature inside the drive.



Cause: The CHARGE light is broken or disconnected.


Remedy:

  • Replace either the control board or the entire drive.
WrUn

Waiting for Run
Cause: The Run command has been applied and the b1-11 timer is active.


Remedy:

  • Adjust b1-11 to the desired delay time. The drive will start normally after the b1-11 timer expires.
1PH

1-Phase Foldback <0x5A>
Cause: An input phase has been lost or too much load is being drawn by the motor in a single-phase application.


Remedy:

  • Reduce the output load.
oPE01

Drive Capacity Setting Fault
Cause: The drive model selection (o2-04) and the actual capacity of the drive are not the same.



Remedy:


Correct the value set to o2-04.
oPE02

Parameter Range Setting Error
Cause: Parameters were set outside the possible setting range.



Remedy:



  • Use U1-18 to find parameters set outside the range.

  • Set parameters to the proper values.


Note: When multiple errors occur simultaneously, other errors are given precedence over oPE02.
oPE03

Multi-Function Input Selection Error
Cause: A contradictory setting is assigned to multi-function contact inputs H1-01 to H1-08. Examples include:

  • The same function is assigned to two multi-function inputs (excludes “Not used” and “External Fault”).

  • Up command set without Down command (or vice versa).

  • Run/Stop (2-wire) set without FWD/REV command.

  • “Drive Enable” set to S1 or S2.

  • Contradictory N.C. and N.O. settings selected simultaneously.




Remedy:



  • Ensure all multi-function inputs are assigned to different functions.

  • Check if contradictory settings have simultaneously been assigned to the multi-function input terminals.

  • Properly set the functions that are required for use in combination with other functions.

  • If Up/Down command and PID control are enabled simultaneously: Set b5-01 to 0 to disable control PID or disable the Up/Down command.

  • Re-enter the multi-function settings to ensure conflicts do not occur.
oPE04

Initialization Required, Term <--> Ctrl Chg
Cause: The drive, control board, or terminal board have been replaced and the parameter settings between the control board and the terminal board no longer match.



Remedy:



  • Set A1-03 to 5550 to load the parameter settings stored in the terminal board to the drive.

  • Initialize parameters after drive replacement by setting A1-03 to 1110 or 2220.
oPE05

Run Command/Frequency Reference Source Selection Error
Cause:

  • Frequency reference is assigned to an option card (b1-01 = 3) but no input option card is connected.

  • The Run command is assigned to an option card (b1-02 = 3) but no input option card is connected.

  • Frequency reference is assigned to the pulse train input (b1-01 = 4) and terminal RP is not set for frequency reference input (H6-01 > 0).




Remedy:



  • Reconnect the input option card to the drive.

  • If using Pulse Train Input: Set H6-01 to 0.
oPE07

Multi-Function Analog Input Selection Error
Cause: A contradictory setting is assigned to multi-function analog inputs H3-02, H3-10, or H3-06 and PID functions conflict.

  • At least two analog input terminals are set to the same function.

  • PID Feedback, Target Value, or Pulse Train inputs are configured incorrectly relative to H6-01 settings.




Remedy:



  • Change the settings to H3-02, H3-10, and H3-06 so that functions no longer conflict.

  • Disable one of the PID selections if simultaneous contradictory settings exist.


Note: Both 0 (Frequency Reference Bias) and F (Not Used) can be set to H3-02, H3-10, or H3-06 simultaneously.
oPE09

PID Control Selection Fault
Cause: PID control function selection is incorrect. (Requires that PID control is enabled b5-01 = 1 to 4).

  • b5-15 is not set to 0.0 (PID Sleep Function) while stopping method is DC Injection or Coast with timer.

  • b5-01 is set to 1 or 2 (PID enabled) but lower limit (d2-02) is not 0 while reverse output is enabled.

  • b5-45 > b5-43 and b5-44.




Remedy:



  • Set b5-15 to a value other than 0.0.

  • Set the stopping method to coast to stop or ramp to stop (b1-03 = 0 or 1).

  • Correct the parameter settings for d2-01, d2-02, or PID limits.
oPE10

V/f Data Setting Error
Cause: V/f pattern setting error. One of the following setting errors has occurred:

E1-09 ≤ E1-07 < E1-06 ≤ E1-11 ≤ E1-04



Remedy:


Correct the settings for E1-04, E1-06, E1-07, E1-09, and E1-11.
oPE11

Carrier Frequency Setting Error
Cause: The following simultaneous contradictory settings have occurred:

  • C6-05 > 6 and C6-04 > C6-03 (carrier frequency lower limit is greater than the upper limit).

  • The upper and lower limits between C6-02 and C6-05 are contradictory.




Remedy:


Correct the setting for the carrier frequency parameters.
oPE28

Sequence Timer Error
Cause: One or more of the sequence timers is not set in the correct order (e.g., S2-01 > S2-02, S2-06 > S2-07, etc).



Remedy:


Correct the parameter settings for the sequence timers.
End1

Excessive V/f Setting
Cause:

The torque reference exceeded 20% during Auto-Tuning OR the results from Auto-Tuning the no-load current exceeded 80%.



Remedy:

  • Prior to Auto-Tuning, verify the information on the motor nameplate.

  • Enter proper values from motor nameplate to parameters T1-02 and T1-04 and repeat Auto-Tuning.

  • If possible, disconnect the motor from the load and perform Auto-Tuning.

  • If the load cannot be uncoupled, use the current Auto-Tuning results.
End2

Motor Iron-Core Saturation Coefficient
Cause:

Motor data entered during Auto-Tuning was incorrect OR Results from Auto-Tuning are outside the parameter setting range.



Remedy:

  • Make sure the data entered to the T1 parameters match the information written on the motor nameplate.

  • Restart Auto-Tuning and enter the correct information.

  • Check and correct faulty motor wiring.

  • Disconnect the motor from machine and perform Rotational Auto-Tuning.
End3

Rated Current Setting Alarm
Cause:

The correct current rating printed on the motor nameplate was not entered into T1-04.



Remedy:

  • Check the setting of parameter T1-04.

  • Check the motor data and repeat Auto-Tuning.
End4

Adjusted Slip Calculation Error
Cause:

The calculated slip is outside the allowable range.



Remedy:

  • Make sure the data entered for Auto-Tuning is correct.

  • If possible, perform Rotational Auto-Tuning.

  • If not possible, perform Stationary Auto-Tuning 2.
End5

Resistance Tuning Error
Cause:

The calculated resistance value is outside the allowable range.



Remedy:

  • Double-check the data entered for the Auto-Tuning process.

  • Check the motor and motor cable connection for faults.
End6

Leakage Inductance Alarm
Cause:

The calculated leakage inductance value is outside the allowable range.



Remedy:

  • Double-check the data entered for the Auto-Tuning process.
End7

No-Load Current Alarm
Cause:

The entered no-load current value was outside the allowable range OR Auto-Tuning results were less than 5% of the motor rated current.



Remedy:

  • Check and correct faulty motor wiring.

  • Double-check the data entered for the Auto-Tuning process.
Er-01

Motor Data Error
Cause:

Motor data entered during Auto-Tuning was incorrect, Output power mismatch, or inconsistent current settings.



Remedy:

  • Check that the motor data entered to T1 parameters matches motor nameplate input before Auto-Tuning.

  • Check the drive and motor capacities.

  • Correct the settings of parameters T1-02 and T1-04.

  • Check the motor rated current and no-load current (T1-04 and E2-03).
Er-02

Minor Fault
Cause:

An alarm was triggered during Auto-Tuning.



Remedy:

  • Exit the Auto-Tuning menu.

  • Check the alarm code, remove the alarm cause, and repeat Auto-Tuning.
Er-03

STOP Button Input
Cause:

Auto-Tuning canceled by pressing STOP button.



Remedy:

  • Auto-Tuning did not complete properly. Restart Auto-Tuning.
Er-04

Line-to-Line Resistance Error
Cause:

Motor data entered incorrect, results outside range, or tuning took too long.



Remedy:

  • Make sure the data entered to the T1 parameters match the information written on the motor nameplate.

  • Restart Auto-Tuning and enter the correct information.

  • Check and correct faulty motor wiring or cable connections.
Er-05

No-Load Current Error
Cause:

Incorrect data, tuning took too long, or load was too high during Rotational Auto-Tuning.



Remedy:

  • Make sure the data entered to the T1 parameters match the information written on the motor nameplate.

  • Check and correct faulty motor wiring.

  • Disconnect the motor from machine and restart Auto-Tuning (ensure load is lower than 30%).

  • If a mechanical brake is installed, make sure it is fully lifted during tuning.
Er-08

Rated Slip Error
Cause:

Incorrect data, tuning took too long, or load was too high during Rotational Auto-Tuning.



Remedy:

  • Make sure the data entered to the T1 parameters match the information written on the motor nameplate.

  • Check and correct faulty motor wiring.

  • Disconnect the motor from machine and restart Auto-Tuning (ensure load is lower than 30%).

  • If a mechanical brake is installed, make sure it is fully lifted during tuning.
Er-09

Acceleration Error
Cause:

The motor did not accelerate for the specified acceleration time OR The load was too high during Rotational Auto-Tuning.



Remedy:

  • Increase the acceleration time (C1-01).

  • Disconnect the motor from machine and restart Auto-Tuning.

  • If a mechanical brake is installed, make sure it is fully lifted during tuning.
Er-11

Motor Speed Fault
Cause:

Torque reference is too high.



Remedy:

  • Increase the acceleration time (C1-01).

  • Disconnect the machine from the motor if possible.
Er-12

Current Detection Error
Cause:

Motor phase missing, Short between lines, Current too low, or Current detection signal error.



Remedy:

  • Check motor wiring and correct any problems.

  • Close any magnetic contactors used between motors.

  • Connect the motor and restart Auto-Tuning.

  • Replace the control board or the entire drive (Contact Yaskawa).
Er-13

Leakage Inductance Error
Cause:

Drive was unable to complete tuning for leakage inductance within 300 seconds.



Remedy:

  • Check all wiring and correct any mistakes.

  • Check the motor rated current value written on the motor nameplate and enter the correct value to T1-04.
Er-17

Reverse Prohibited Error
Cause:

Drive is prohibited from rotating the motor in reverse while attempting to perform Inertia Tuning.



Remedy:

  • Inertia Auto-Tuning cannot be performed if the drive is restricted from rotating in reverse.

  • Assuming it is acceptable for the application to rotate in reverse, set b1-04 to 0 and then perform Inertia Tuning.
CoPy
Writing Parameter Settings (flashing)
Cause: Parameters are being written to the drive.



Remedy: This is not an error.
CPyE
Error Writing Data
Cause: Failed writing parameters.



Remedy: Attempt to write parameters again.
CSEr
Copy Unit Error
Cause: Hardware fault.



Remedy: Replace the operator or the USB Copy Unit.
dFPS
Drive Model Mismatch
Cause: The drives used in the copy and write process are not the same model.

  • The drive from which the parameters were copied is a different model.

  • The drive to be written to is a different model.





Remedy:

  • Verify the model number of the drive from which the parameters were copied and the model of the drive to which those parameters will be written.

  • Make sure the two drives are the same model and have the same software version.
End
Task Complete
Cause: Finished reading, writing, or verifying parameters.



Remedy: This is not an error.
iFEr
Communication Error
Cause:

  • A communication error occurred between the drive and the operator or the USB copy unit.

  • A non-compatible cable is being used to connect the USB Copy Unit and the drive.





Remedy:

  • Check the cable connection.

  • Use the cable originally packaged with the USB Copy Unit.
ndAT
Model, Voltage Class, Capacity Mismatch
Cause:

  • The drive from which the parameters were copied and the drive to which the parameters will be written have different electrical specifications, capacities, are set to different control modes, or are different models.

  • The device being used to write the parameters is blank and does not have any parameters saved on it.





Remedy:

  • Make sure model numbers and specifications are the same for both drives.

  • Make sure all connections are correct, and copy the parameter settings onto the USB Copy Unit or the operator.
rdEr
Error Reading Data
Cause: Failed while attempting to read parameter settings from the drive.



Remedy: Press and hold the READ key on the USB Copy Unit for at least one second to have the unit read parameters from the drive.
rEAd
Reading Parameter Settings (flashing)
Cause: Displayed while the parameter settings are being read onto the USB Copy Unit.



Remedy: This is not an error.
vAEr
Voltage Class, Capacity Mismatch
Cause: The drive from which the parameters were copied and the drive on which the Verify mode is being performed have different electrical specifications or are a different capacity.



Remedy: Make sure electrical specifications and capacities are the same for both drives.
vFyE
Parameter settings in the drive and those saved to the copy function are not the same
Cause: Indicates that parameter settings that have been Read and loaded onto the Copy Unit or Digital Operator are different.



Remedy: To synchronize parameters, either write the parameters saved on the USB Copy Unit or digital operator onto the drive, or Read the parameter settings on the drive onto the USB Copy Unit.
vrFy
Comparing Parameter Settings (flashing)
Cause: The Verify mode has confirmed that parameter settings on the drive and parameters read to the copy device are identical.



Remedy: This is not an error.