Yaskawa D1000 Drive Fault Codes

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Complete guide to Yaskawa D1000 Regenerative Converter fault codes. Learn to troubleshoot DC bus errors, input phase loss, and power quality alarms using DriveWizard.

D1000 Fault Codes Reference Table

Below is the complete reference list of faults and alarms specific to the converter unit. Please refer to this table to identify the issue currently displayed on your keypad.

YASKAWA D1000 Faults and Alarms

YASKAWA D1000 Fault Displays, Causes, and Possible Solutions

Fault Code and Meaning Cause and Remedy
Aov
Power Supply Overvoltage		 Cause: The input power supply voltage is too high.

Remedy: Reduce the voltage to within the range in the power supply specifications.
AUv
Power Supply Undervoltage		 Cause:
  • The capacity of the power supply is too small.
  • The AC fuse is open (transistor destroyed, short circuit).
  • The distortion in the power supply is too large.
  • A phase loss occurred in the input power supply.

Remedy:
  • Increase the capacity of the power supply.
  • Consult with your Yaskawa representative (check for ground faults/shorts).
  • Lower the impedance of the input power supply wiring.
  • Check input power for phase loss or imbalance; correct and reset.
bUS
Option Communication Error		 Cause:
  • No signal was received from the PLC (faulty wiring).
  • Communication data error occurred due to noise.
  • The option card is damaged or not properly connected.

Remedy:
  • Check for faulty wiring, disconnected cables, and short circuits. Repair as needed.
  • Counteract noise (grounding, shielding, separate communication wiring, install EMC filter).
  • Reinstall the option card. If error continues, replace the option card.
CE
MEMOBUS/Modbus Communication Error		 Cause: Faulty communications wiring or an existing short circuit.

Remedy:
  • Check for faulty wiring.
  • Correct the wiring.
  • Check for disconnected cables and short circuits and repair as needed.
  • Check options to minimize noise effects.
CoF
Current Offset Fault		 Cause: An error occurred in the power supply detection circuit (automatic current offset adjustment failed).

Remedy: Cycle the power supply and check operation. If the fault occurs again, replace the board or converter.
CPF00, CPF01, CPF11 to CPF22, CPF26 to CPF35
Control Circuit Error		 Cause:
  • There is a self-diagnostic error in the control circuit.
  • Connector on the operator is damaged.

Remedy:
  • Cycle power to the converter. If the problem continues, replace the control board or the entire converter.
  • Replace the operator.
CPF02
A/D Conversion Error		 Cause: Control circuit is damaged (A/D conversion error).

Remedy: Cycle power to the converter. If the problem continues, replace the control board or the entire converter.
CPF03
Control Board Connection Error		 Cause:
  • There is a connection error between the control board and converter.
  • Converter fails to operate properly due to noise interference.

Remedy:
  • Turn off power and check connection. If problem continues, replace control board.
  • Counteract noise (grounding, shielding, surge absorbers, separate wiring, EMC filter).
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. If problem continues, replace control board.
  • Reinitialize the converter (A1-03 = 2220, 3330).
CPF07, CPF08
Terminal Board Connection Error		 Cause: There is a faulty connection between the terminal board and the control board.

Remedy: Turn off the power and reconnect the terminal board. If the problem continues, replace the control board or the entire converter.
CPF23
Control Board Connection Error		 Cause: Hardware is damaged.

Remedy: Turn off the power and check the connection between the control board and the converter. If the problem continues, replace the control board or the entire converter.
CPF24
Unit Capacity Detect Fault		 Cause: Hardware is damaged (converter capacity cannot be detected).

Remedy: If the problem continues, replace the control board or the entire converter.
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 command or SYNC_SET command and proceed to phase 3. Refer to the MECHATROLINK Option Technical 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.
  • 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 terminals S1 to S8)		 Cause:
  • An external device tripped an alarm function.
  • Wiring is incorrect.
  • Multi-function contact input setting is incorrect.

Remedy:
  • Remove the cause of the external fault and reset the fault.
  • Properly connect signal lines to terminals assigned for external fault detection (H1-xx = 20 to 2B).
  • Check for unused terminals set for external fault and change terminal settings.
Err
EEPROM Write Error		 Cause:
  • Electrical noise has corrupted data while writing to the EEPROM.
  • Hardware problem.

Remedy:
  • Press "ENTER" on the digital operator, correct parameter setting, and cycle power.
  • If problem continues, replace the control board or entire converter.
Fan
Internal Fan Fault		 Cause:
  • Internal cooling fan has malfunctioned.
  • Fault detected in the internal cooling fan or magnetic contactor to the power supply.

Remedy:
  • Cycle power to the converter.
  • Check fan operation.
  • Verify cumulative operation time (U4-03) and maintenance timer (U4-04).
  • If fan exceeded life or is damaged, replace the fan.
Fdv
Power Supply Frequency Fault		 Cause:
  • A momentary power loss occurred.
  • An input power supply wiring terminal is loose.
  • The fluctuation in the voltage of the input power supply is too large.
  • The AC power supply fuse is open (transistor destroyed).

Remedy:
  • Investigate and correct the cause and reset the fault.
  • Investigate wiring/connections.
  • Contact your Yaskawa representative if the fuse is open or transistor is destroyed.
FUA
AC Fuse Blowout
The power supply fuse is open.		 Cause:
The power supply fuse is open.

Remedy:
  • A transistor inside the converter was destroyed.
  • The input wiring or drive output has ground faulted or short circuited.
  • Contact your Yaskawa representative or the nearest Yaskawa sales office.
FUd
DC Fuse Blowout
The DC converter output fuse is open.		 Cause:
The main transistor failed.
The DC circuit fuse is open.
The drive failed.

Remedy:
  • Replace the converter.
  • Replace the drive.
  • For information on drive replacement, consult with your Yaskawa representative.
GF
Ground Fault
Current exceeded Ground Short Detection Level at power supply side.		 Cause:
A damaged cable is creating a short circuit.
Excessive leakage current at the drive output.
Hardware problem.
Wiring of detection circuits (r1, ℓ1, t1) or main circuits is incorrect.

Remedy:
  • Check the cable and resistance between cable and ground terminal.
  • Remove short circuit and reapply power.
  • Reduce the amount of stray capacitance.
  • If hardware problem continues, replace control board or converter.
  • Correct the wiring.
nSE
Node Setup Error
A terminal assigned to node setup closed during run.		 Cause:
The node setup terminal closed during run.
A Run command was issued while the node setup function was active.

Remedy:
  • Stop the converter when using the node setup function.
oC
Overcurrent
Output current greater than specified level.		 Cause:
A momentary power loss occurred.
One of the cables has shorted out or there is a grounding problem.
The load is too heavy.

Remedy:
  • Investigate and correct the cause and reset the fault (See Diagnosing faults).
  • Check motor cables and remove short circuits.
  • Check resistance between motor cables and ground terminal.
  • Measure current flowing into the converter.
  • Replace converter with larger capacity if current exceeds rated current.
  • Reduce load to avoid sudden changes in current level.
oFA00
Option Card Connection Error (CN5-A)
Option compatibility error.		 Cause:
The option card installed into port CN5-A is incompatible with the converter.

Remedy:
  • Check if the converter 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 the power and reconnect the option card.
oFA05 to oFA06
oFA10 to oFA11
oFA12 to oFA17
oFA30 to oFA43
Option Card Error (CN5-A)		 Cause:
Option card or hardware is damaged.
Communication Option Card Connection Error (CN5-A).

Remedy:
  • Cycle power to the converter.
  • If the problem continues, replace the control board or the entire converter.
  • Contact Yaskawa for instructions on replacing the control board.
oFb00
Option Card Fault (CN5-B)
Option compatibility error.		 Cause:
The option card installed into port CN5-B is incompatible with the converter.

Remedy:
  • Make sure the converter supports the option card to be installed.
  • Contact Yaskawa for assistance.
oFb01
Option Card Fault (CN5-B)
Option not properly connected.		 Cause:
The option card connection to port CN5-B is faulty.

Remedy:
  • Turn off the power and reconnect the option 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 option port CN5-A.

Remedy:
  • Only one of each option card type can be installed simultaneously.
  • Make sure only one type of option card is connected.
oFb03 to oFb11
oFb12 to oFb17
Option card error (CN5-B)		 Cause:
Option card or hardware is damaged.
There is a fault in the option card.

Remedy:
  • Cycle power to the converter.
  • If problem continues, replace control board or entire converter.
oFC00
Option Card Connection Error (CN5-C)
Option compatibility error.		 Cause:
The option card installed into port CN5-C is incompatible with the converter.

Remedy:
  • Confirm that the converter supports the option card to be installed.
  • Contact Yaskawa for assistance.
oFC01
Option Card Fault (CN5-C)
Option not properly connected.		 Cause:
The option card connection to port CN5-C is faulty.

Remedy:
  • Turn the power off and reconnect the option card.
oFC02
Option Card Fault (CN5-C)
Same type of option card is currently connected.		 Cause:
An option card of the same type is already installed in option port CN5-A or CN5-B.

Remedy:
  • Only one of each option card type can be installed simultaneously.
oFC03 to oFC11
oFC12 to oFC17
Option Card Error (CN5-C)		 Cause:
Option card or hardware is damaged.
There is a fault in the option card.

Remedy:
  • Cycle power to the converter.
  • If problem continues, replace control board or entire converter.
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
Temperature exceeded pre-alarm level (L8-02).		 Cause:
Surrounding temperature is too high.
Load is too heavy.
Internal cooling fan is stopped.

Remedy:
  • Check temperature surrounding the converter (verify within specs).
  • Improve air circulation or install a fan/AC.
  • Remove heat sources near the converter.
  • Measure output current and decrease load.
  • Replace the cooling fan (see maintenance section).
  • Reset cooling fan maintenance parameter (o4-03) to 0 after replacement.
oH1
Overheat 1
Heatsink temperature exceeded converter overheat level.		 Cause:
Surrounding temperature is too high.
Load is too heavy.
Internal cooling fan is stopped.

Remedy:
  • Check temperature surrounding the converter.
  • Improve air circulation within the enclosure.
  • Install a fan or air conditioner.
  • Measure output current and reduce the load.
  • Replace the cooling fan and reset parameter o4-03.
oL2
Converter Overload
Thermal sensor triggered overload protection.		 Cause:
Load is too heavy.
Converter capacity is too small.
The converter does not operate.

Remedy:
  • Reduce the load.
  • Replace the converter with a larger model.
  • Start converter operation first, and then start converter operation.
oPr

External Digital Operator Connection Fault
The external operator has been disconnected from the converter. 		Cause:
External operator is not properly connected to the converter.

Remedy:
  • Check the connection between the operator and the converter.
  • Replace the cable if damaged.
  • Turn off the input power and disconnect the operator. Reconnect the operator and reapply converter input power.
ov

Overvoltage
Voltage in the DC bus has exceeded the overvoltage detection level.
(200 V Class: ~410 V, 400 V Class: ~820 V) 		Cause:
  • A momentary power loss occurred.
  • The regenerative load is too large.
  • Input power voltage is too high.
  • Converter fails to operate properly due to noise interference.
  • The wiring of the power supply voltage detection circuits and main circuit terminals is not correct.

Remedy:
  • Investigate and correct the cause and reset the fault (See Diagnosing and Resetting Faults).
  • Reduce the regenerative load.
  • Check the voltage and lower input power voltage within limits.
  • Review noise control solutions and check grounding/shielding.
  • Correct the wiring.
PF2

Input Power Supply Fault
Abnormal oscillation in the main circuit DC bus continued. 		Cause:
  • The fluctuation in the voltage of the input power supply is too large.
  • A phase loss occurred in the input power supply.
  • The capacity of the power supply is too small.
  • The wiring is too long.
  • The phase imbalance is too large.

Remedy:
  • Investigate and correct the cause and reset the fault.
  • Refer to Diagnosing and Resetting Faults on page 133.
PF3

Input Phase Loss Detection
The voltage balance in the three-phase power supply has broken down. 		Cause:
  • The fluctuation in the voltage of the input power supply is too large.
  • A phase loss occurred in the input power supply.
  • The capacity of the power supply is too small.
  • The wiring is too long.
  • The phase imbalance is too large.

Remedy:
  • Investigate and correct the cause and reset the fault.
  • Refer to Diagnosing and Resetting Faults on page 133.
SC

Input Short-circuit / Main Transistor Failure
Short circuit or ground fault is detected.
(Note: Fault reset signals are not accepted to prevent accidents). 		Cause:
  • IGBT fault.
  • IGBT short circuit detection circuit fault.

Remedy:
  • Check the wiring to the drive.
  • Turn the power supply off and then on again to check operation.
  • If the problem continues, contact your Yaskawa representative.
SrC

Phase Order Fault
The phase order detection direction for the input power supply changed after the power supply was turned on. 		Cause:
  • The power supply phase order changed during operation.
  • A momentary power loss occurred.
  • An input power supply wiring terminal is loose.
  • The fluctuation in the voltage of the input power supply is too large.

Remedy:
  • Investigate and correct the cause and reset the fault.
  • Refer to Diagnosing and Resetting Faults on page 133.
Uv1

Main Circuit Undervoltage
The main circuit DC voltage became equal to or lower than the set value (200 V: ~190V, 400 V: ~380V). 		Cause:
  • A phase loss occurred in the input power supply.
  • An input power supply wiring terminal is loose.
  • Fluctuation occurred in the power supply voltage.
  • A power loss occurred.
  • The main circuit capacitor circuit in the converter has deteriorated.
  • The operation of the relay/contactor in the inrush current protection circuit failed.
  • A fault occurred in the power supply device.

Remedy:
  • Check wiring for broken wires/mistakes and correct.
  • Check terminals for looseness and tighten to torque.
  • Correct voltage to be within range; check magnetic contactor.
  • Improve the power supply.
  • Check capacitor maintenance period (U4-05). Replace if >90%.
  • Cycle power. If repeated, replace board/converter. Check relay maintenance (U4-06).
  • Check/correct wiring of power supply device.
Uv2

Control Power Supply Voltage Fault
Voltage is too low for the control converter input power. 		Cause:
Internal circuitry is damaged.

Remedy:
  • Cycle power to the converter. Check if the fault reoccurs.
  • If the problem continues, replace either the control board or the entire converter.
  • Contact Yaskawa or a Yaskawa representative.
Uv3

Undervoltage 3 (Soft-Charge Bypass Circuit Fault)
The soft-charge bypass circuit failed. 		Cause:
The relay or contactor on the soft-charge bypass circuit is damaged.

Remedy:
  • Cycle power to the converter and see if the fault reoccurs.
  • If the problem continues, replace either the control board or the entire converter.
  • Check monitor U4-06 for the performance life of the soft-charge bypass.
  • Replace either the control board or the entire converter if U4-06 exceeds 90%.
Uv4

Gate Drive Board Undervoltage
Voltage drop in the gate drive board circuit. 		Cause:
Not enough power is being supplied to the gate drive board.

Remedy:
  • Cycle power to the converter and see if the fault reoccurs.
  • If the problem continues, replace either the gate drive board or the entire converter.
vrE

Resonance Detection
A filter resonance fault was detected or there is a harmonic component on the power supply side. 		Cause:
  • The power supply was turned off during operation.
  • There is noise on the power supply line.
  • A phase was lost for an input terminal during operation.

Remedy:
  • Stop the operation of the converter and turn off the power supply.
  • Investigate the source of the noise and implement countermeasures.
  • Check the wiring of the power supply system and remove the cause of the phase loss.
AEr
Communication Option Station Number Setting Error		 Cause:
Station number is set outside the possible setting range.

Remedy:
  • Set the station number of the option card correctly.
Aov
Power Supply Overvoltage		 Cause:
The input power supply voltage is too high.

Remedy:
  • Reduce the voltage to within the range in the power supply specifications.
AUv
Power Supply Undervoltage		 Cause:
The power supply voltage is low, a phase loss occurred, or voltage detection failed.

Remedy:
  • Increase the power supply voltage.
  • Check the input power supply for phase loss or an imbalance in the interphase voltages. Investigate and correct the cause and reset the fault.
  • Correctly wire r1/ℓ11, ℓ/ℓ21, and t1/ℓ31.
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.
bUS
Option Communication Error		 Cause:
Connection broken, option damaged, improper connection, or data error 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 continues, replace the option.
  • Reinstall the option (ensure pins are lined up).
  • Check options available to minimize effects of noise.
  • Use surge absorbers on magnetic contactors causing disturbance.
  • Use shielded lines and ground correctly.
CALL
Serial Communication Transmission Error		 Cause:
Communications wiring is faulty, programming error on master side, circuitry damaged, or termination resistor setting incorrect.

Remedy:
  • Check for wiring errors, disconnected cables, and short circuits.
  • Check communications at start-up and correct programming errors.
  • Perform a self-diagnostics check. If problem continues, replace control board or converter.
  • Install a termination resistor at both ends of communication line. Set DIP switch S2 to ON.
CE
MEMOBUS/Modbus Communication Error		 Cause:
Data error due to noise, incompatible protocol, CE detection time (H5-09) set too short, PLC hardware/software problem, or cable disconnected.

Remedy:
  • Take steps to counteract noise (shielding, grounding, surge absorbers).
  • Check H5 parameter settings and protocol compatibility.
  • Set a longer CE detection time using parameter H5-09.
  • Check the PLC and remove the cause of the error on the controller side.
  • Check the connector and/or replace the communications cable.
CoF
Current Offset Fault		 Cause:
A fault occurred in the current detection circuit.

Remedy:
  • Cycle the power supply and check operation.
  • If the fault occurs again, replace the board or converter.
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.
CyC
MECHATROLINK Communications Cycle Setting Error		 Cause:
The communications cycle of the MECHATROLINK option card is out of range.

Remedy:
  • Correct the setting.
E5
MECHATROLINK Watchdog Timer Error		 Cause:
There is no continuity in the watchdog timer in the data that is sent by the host controller.

Remedy:
  • Execute the DISCONNECT or ALM_CLR command, and then move to phase 3 again with the CONNECT or SYNC_SET command.
EF0
Option Card External Fault		 Cause:
An external fault was received from the PLC (with F6-03 set to 3), or 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
External Fault (Input Terminal S1)		 Cause: An external device has tripped an alarm function, wiring is incorrect, or 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 = 24 to 27, 2C to 2F).
  • Reconnect the signal line.
  • Check if unused terminals have been set for H1-xx = 24 to 27, 2C to 2F.
  • Change terminal settings.
EF2
External Fault (Input Terminal S2)		 Cause: External fault at multi-function input terminal S2.

Remedy:
  • Refer to remedies for EF1.
EF3
External Fault (Input Terminal S3)		 Cause: External fault at multi-function input terminal S3.

Remedy:
  • Refer to remedies for EF1.
EF4
External Fault (Input Terminal S4)		 Cause: External fault at multi-function input terminal S4.

Remedy:
  • Refer to remedies for EF1.
EF5
External Fault (Input Terminal S5)		 Cause: External fault at multi-function input terminal S5.

Remedy:
  • Refer to remedies for EF1.
EF6
External Fault (Input Terminal S6)		 Cause: External fault at multi-function input terminal S6.

Remedy:
  • Refer to remedies for EF1.
EF7
External Fault (Input Terminal S7)		 Cause: External fault at multi-function input terminal S7.

Remedy:
  • Refer to remedies for EF1.
EF8
External Fault (Input Terminal S8)		 Cause: External fault at multi-function input terminal S8.

Remedy:
  • Refer to remedies for EF1.
Fan
Converter Internal Circulation Fan Fault		 Cause: An internal circulation fan or MC power supply is faulty (2A0130 or 4A0130 to 4A0370).

Remedy:
  • Cycle the power supply and see if the fault occurs again.
  • Check the operation of the internal circulation fans.
  • Check U4-03 (Cooling Fan Operation Time) and U4-04 (Cooling Fan Maintenance Display).
  • If the life of the internal circulation fans has expired or if a fan is faulty, perform fan replacement.
  • If the fault occurs repeatedly, replace the board or the converter.
Fdv
Power Supply Frequency Fault		 Cause:
  • A momentary power loss occurred.
  • An input power supply wiring terminal is loose.
  • Fluctuation in input power supply voltage is too large.
  • The AC power supply fuse is open (Transistor destroyed or input wiring/output ground fault).
  • The phase rotation direction has changed in the input power supply.
  • The detected power supply frequency exceeded the allowable value.

Remedy:
  • Investigate and correct the cause and reset the fault.
  • Correct the wiring.
  • Improve the power supply.
  • Contact your Yaskawa representative if the fuse is open or transistor destroyed.
HCA
Current Alarm		 Cause: Load is too heavy (Current exceeded 150% of rated current).

Remedy:
  • Reduce the load for applications with repetitive operations (stops and starts).
  • Replace the converter with a larger capacity unit.
LT-1
Cooling Fan Maintenance Time		 Cause: The cooling fan has reached 90% of its expected performance life.

Remedy:
  • Replace the cooling fan.
  • 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 either the control board or the entire converter.
  • Contact Yaskawa or your nearest sales representative.
LT-3
Soft Charge Bypass Relay Maintenance Time		 Cause: The DC bus soft charge relay has reached 90% of expected performance life.

Remedy:
  • Replace either the control board or the entire converter.
oH
Heatsink Overheat		 Cause:
  • Surrounding temperature is too high.
  • Airflow around the converter is restricted (dust/debris).
  • The load is too large.
  • Internal cooling fan has stopped.

Remedy:
  • Check ambient temperature and improve ventilation/install cooling device.
  • Remove heat-generating objects nearby.
  • Provide proper installation space (refer to manual).
  • Check for dust clogging the fan and clear debris.
  • Measure output current and lower the load.
  • Replace the cooling fan if stopped.
oL2
Converter Overload		 Cause:
  • Load is too heavy.
  • The converter does not operate.

Remedy:
  • Reduce the load.
  • Start converter operation first, and then start converter operation.
ov
DC Bus Overvoltage		 Cause:
  • Electrical noise interference causes converter to operate incorrectly.
  • There was a regenerative load while the converter is stopped.
  • The power supply voltage is too high.
  • Wiring of power supply voltage detection circuits or main circuit terminals is incorrect.

Remedy:
  • Review solutions for handling noise interference (check grounding, install surge protector).
  • Set number of fault restarts (L5-01) to a value other than 0.
  • Operate the converter.
  • Lower the voltage so it is within specifications.
  • Check and correct the wiring (r1/l11, s1/l21, t1/l31).
PAUv
Power Supply Undervoltage Pre-Alarm		 Cause:
  • The power supply voltage is low.
  • A phase loss occurred in the input power supply.
  • Voltage detection failed.

Remedy:
  • Increase the power supply voltage.
  • Check the input power supply for phase loss or imbalance.
  • Investigate and correct the cause and reset the fault.
  • Check r1/l11, s1/l21, t1/l31 to see if they are wired correctly.
PF3
Input Phase Loss Detection		 Cause:
  • Fluctuation in voltage of input power supply is too large.
  • A phase loss occurred in the input power supply.
  • The interphase voltage balance is bad.

Remedy:
  • Investigate the cause and implement countermeasures.
  • Refer to Diagnosing and Resetting Faults (page 133).
SE
MEMOBUS/Modbus Test Mode Fault		 Cause: A fault occurred during MEMOBUS/Modbus Communications Test Mode.

Remedy:
  • Always stop the operation of the converter before you perform MEMOBUS/Modbus communications tests.
SrC
Phase Order Fault		 Cause:
  • A momentary power loss occurred.
  • An input power supply wiring terminal is loose.
  • The fluctuation in the voltage of the input power supply is too large.

Remedy:
  • Investigate and correct the cause and reset the fault.
  • Refer to Diagnosing and Resetting Faults (page 133).
Uv
Undervoltage		 Cause:
  • Phase loss in the converter input power.
  • Loose wiring in the converter input power terminals.
  • Problem with the converter input power voltage.
  • A power loss occurred.
  • Internal circuitry is worn (capacitors).
  • Converter input power transformer is too small.
  • Air inside the converter is too hot.
  • The CHARGE light is broken or disconnected.

Remedy:
  • Check for wiring errors in main circuit input power. Correct wiring.
  • Ensure terminals are properly tightened to specified torque.
  • Check voltage and lower input power voltage to within limits.
  • Improve the power supply.
  • Check maintenance time for capacitors (U4-05). Replace board if >90%.
  • Check capacity of the converter input power transformer.
  • Check temperature inside the converter.
  • Replace either the control board or the entire converter.
vrE
Resonance Detection		 Cause: There is noise on the power supply line.

Remedy:
  • Investigate the source of the noise and implement countermeasures.
Err

EEPROM Write Error
A verification mismatch occurred when writing data to the EEPROM. 		Cause:
1. The data was corrupted by noise when writing data to the EEPROM.
2. EEPROM Hardware Failure.

Remedy:
  • Press ENTER key.
  • Set the parameters again.
  • Cycle the power supply.
  • Replace the board or converter if hardware failure is suspected.
oPE01

Converter Capacity Setting Fault
Converter capacity and the value set to o2-04 do not match. 		Cause:
The drive model selection (o2-04) and the actual capacity of the converter are not the same.

Remedy:
Correct the value set to o2-04.
oPE02

Parameter Range Setting Error
Use U1-18 to find parameters set outside the range. 		Cause:
Parameters were set outside the possible setting range.

Remedy:
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
A contradictory setting is assigned to multi-function contact inputs H1-01 to H1-08. 		Cause:
The same function is assigned to two multi-function inputs. Excludes “Not used” and “External Fault.”

Remedy:
  • Ensure all multi-function inputs are assigned to different functions.
  • Re-enter the multi-function settings to ensure this does not occur.
oPE04

Terminal Board Mismatch Error
The converter or the removable terminal block with parameter backup was replaced. 		Cause:
The converter was replaced (but the removable terminal block with parameter backup was not replaced), OR the removable terminal block was replaced.

Remedy:
  • Set A1-03 to 5550 to load the parameter settings stored in the terminal board to the converter.
  • Initialize parameters after converter replacement by setting A1-03 to 2220.
oPE05

Run Command Selection Error
The settings for the Run Command or Bus Voltage Command are not correct. 		Cause:
The Run command is assigned to an option card (b1-18 = 3 or b1-02 = 3) and an input option card is not connected to the converter.

Remedy:
Reconnect the input option card to the converter.
oPE07

Multi-Function Analog Input Selection Error
A contradictory setting is assigned to multi-function analog inputs H3-02, H3-10, or H3-06. 		Cause:
At least two of these parameters have the same setting: H3-02, H3-10, or H3-06.

Remedy:
Change the settings to H3-02, H3-10, and H3-06 so that functions no longer conflict.
oPE30

Incorrect Input Voltage Adjustment
The input voltage offset adjustment has not been performed. 		Cause:
  • The setting of o2-04 (Drive Model Selection) changed.
  • ERPROM failed for the input voltage offset.


Remedy:
For information on clearing the fault, consult with your Yaskawa representative or the nearest Yaskawa sales office.
CoPy

Writing Parameter Settings (flashing)		 Cause:
The operator is currently writing parameter settings to the converter.

Remedy:
Status display only. Wait for the task to complete.
CPyE

Error Writing Data		 Cause:
An error occurred while attempting to write data to the converter.

Remedy:
Press any key on the operator to clear the error. Check connections and compatibility.
CSEr

Copy Unit Error		 Cause:
A hardware or data error occurred within the Copy Unit.

Remedy:
Press any key on the operator to clear the error. If the problem persists, replace the Copy Unit.
dFPS

Model Mismatch		 Cause:
The model number of the drive does not match the data being copied.

Remedy:
Press any key on the operator to clear the error. Ensure the source and target drive models match.
End

Task Complete		 Cause:
The requested copy/verify task has finished successfully.

Remedy:
Status display only. No action required.
iFEr

Communication Error		 Cause:
Data communication between the operator/copy unit and the converter was interrupted.

Remedy:
Press any key to clear. Check the cable connection between the operator and the converter.
ndAT

Model, Voltage Class, Capacity Mismatch		 Cause:
The model, voltage class, or capacity specifications do not match between the saved data and the converter.

Remedy:
Press any key to clear. Parameters can only be saved when voltage class, capacity, control mode, and software version match (See Note 3).
rdEr

Error Reading Data		 Cause:
An error occurred while reading data from the converter.

Remedy:
Press any key to clear the error. Retry the read operation.
rEAd

Reading Parameter Settings (flashing)		 Cause:
The operator is currently reading parameter settings from the converter.

Remedy:
Status display only. Wait for the task to complete.
vAEr

Voltage Class, Capacity Mismatch		 Cause:
The voltage class or capacity of the converter does not match the data in the copy unit.

Remedy:
Press any key to clear. Verify the converter rating plate matches the intended configuration.
vFyE

Parameter Mismatch		 Cause:
Parameter settings in the converter and those saved to the copy function are not the same.

Remedy:
Press any key to clear. Review parameters to identify differences.
vrFy

Comparing Parameter Settings (flashing)		 Cause:
The system is currently comparing the parameters in the converter with the saved data.

Remedy:
Status display only. Wait for the task to complete.
 

How to Read D1000 Faults via DriveWizard

Troubleshooting a converter requires analyzing the interaction between the grid and the DC Bus. In 2026, standard multimeters are often insufficient for catching fast power spikes. Use these tools instead:

  • U2 Fault Trace Parameters: Access the “Black Box” history directly via the keypad.
    • U2-01: Current Fault Code.
    • U2-04 thru U2-20: These monitors freeze the data at the moment of the trip. Pay specific attention to U2-11 (DC Bus Voltage) and U2-13 (Input Terminal Status) to see if the unit tripped due to a grid surge or an external command.
  • DriveWizard Industrial: By connecting a PC via USB or Serial, you can use the **Oscilloscope function**. This is critical for the D1000 to visualize the AC Input Waveform and ensure the regeneration synchronization is matching the grid frequency.

Frequently Asked Questions (FAQ)

Q: What is the difference between an Alarm and a Fault on the D1000?

A:

  • Alarm (Flashing): The unit detects a non-critical issue (like High Heatsink Temp) but continues to regulate the DC bus.
  • Fault (Solid): The unit detects a critical failure. The D1000 immediately stops the “Gate” (transistor switching), stopping the conversion of power. The connected inverters will likely trip on “Under Voltage” (Uv) shortly after.

Q: How do I reset a Yaskawa D1000 fault?

A: After verifying the incoming power lines are stable:

  • Press the RESET button on the keypad.
  • Trigger the “Fault Reset” digital input (Terminal S4).
  • Cycle the main AC input power (Wait for the DC Bus light to extinguish).

Q: Why does the D1000 trip on “PF” (Input Phase Loss)?

A: The D1000 monitors the input power ripple. If one phase of the incoming 3-phase power sags or is lost, the DC bus ripple increases, triggering a PF fault. Check your input fuses, circuit breakers, and incoming voltage balance.

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