Yaskawa R1000 Drive Fault Codes

Complete guide to Yaskawa R1000 Regenerative Unit fault codes. Troubleshoot DC bus connections, Input Phase Loss (PF), grid synchronization errors, and use DriveWizard.

R1000 Fault Codes Reference Table

Below is the complete reference list of faults and alarms. Please refer to this table to interpret the code currently displayed on the R1000 keypad.

YASKAWA R1000 Fault Displays, Causes, and Solutions

Fault Code and Meaning	Cause and Remedy
Aov Power Supply Overvoltage	Cause: The input power supply voltage is too high. (200 V Class: > 277 Vac, 400 V Class: > 554 Vac) 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. A transistor inside the regenerative unit was destroyed. Input wiring or drive output is ground-faulted/short-circuited. Distortion in power supply is too large. Phase loss in input power supply. Remedy: Increase the capacity of the power supply. Lower the impedance of the input power supply wiring. Check input power for phase loss or imbalance. Consult with your Yaskawa representative if transistor is destroyed.
bUS Option Communication Error	Cause: No signal was received from the PLC. Faulty communications wiring or existing short circuit. Communication data error occurred due to noise. The option card is damaged or not properly connected. Remedy: Check for faulty wiring, disconnected cables, or short circuits. Counteract noise (grounding, shielding, surge absorbers). Install an EMC noise filter. Reinstall or replace the option card.
CE MEMOBUS/Modbus Communication Error	Cause: Control data was not received for the CE detection time set to H5-09. Faulty communications wiring or short circuit. Communication data error due to noise. Remedy: Check wiring and correct if necessary. Counteract noise in control/main circuit and ground wiring. Use shielded lines and separate communication wiring from drive power lines.
CoF Current Offset Fault	Cause: An error occurred in the power supply detection circuit during adjustment of automatic current offset. Remedy: Cycle the power supply and check operation. If fault occurs again, replace the board or regenerative unit.
CPF00, CPF01 CPF11 to CPF22 CPF26 to CPF35 Control Circuit Error	Cause: There is a self-diagnostic error in the control circuit. Remedy: Cycle power to the regenerative unit. If problem continues, replace the control board or entire regenerative unit.
CPF02 A/D Conversion Error	Cause: Control circuit is damaged (A/D conversion error). Remedy: Cycle power to the regenerative unit. If problem continues, replace the control board or entire regenerative unit.
CPF03 Control Board Connection Error	Cause: There is a connection error between the control board and the regenerative unit. Remedy: Turn off power and check the connection between the control board and unit. If problem continues, replace the control board or entire unit.
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, check connections, or replace control board. Reinitialize the regenerative unit (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 problem continues, replace the control board or entire unit.
CPF23 Control Board Connection Error	Cause: Hardware is damaged (Connection error). Remedy: Turn off power and check connection between control board and unit. If problem continues, replace the control board or entire unit.
CPF24 Unit Capacity Detect Fault	Cause: Hardware is damaged (Regenerative unit capacity cannot be detected correctly). Remedy: If problem continues, replace the control board or entire unit.
E5 MECHATROLINK Watchdog Timer Error	Cause: Data has not been received from the PLC (Watchdog timed out). Remedy: Execute DISCONNECT or ALM_CLR. Issue a CONNECT command or SYNC_SET command. Refer to MECHATROLINK Option Technical Manual.
EF0 Option Card External Fault	Cause: An external fault was received from the PLC. Problem with the PLC program. Remedy: Remove the cause of the external fault. Check the PLC program and correct problems.
EF1 to EF8 External Fault (Input terminals S1-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. Properly connect signal lines (H1-xx = 20 to 2B). Check for unused terminals set for External Fault.
Err EEPROM Write Error	Cause: Electrical noise has corrupted data while writing to EEPROM. Hardware problem. Remedy: Press "ENTER", correct parameter setting, and cycle power. If problem continues, replace control board or unit.
Fan Internal Circulation Fan Fault	Cause: Internal circulation fan malfunctioned (Fan or magnetic contactor failure). Remedy: Cycle power to the regenerative unit. Check fan operation and cumulative operation time (U4-03, U4-04). Replace cooling fan if damaged or life exceeded.
Fdv Power Supply Frequency Fault	Cause: A momentary power loss occurred. Input power supply wiring terminal is loose. Fluctuation in voltage is too large. The AC power supply fuse is open. Remedy: Investigate/correct cause and reset fault. Check wiring and ground faults. Consult Yaskawa if transistor is destroyed.
FUA AC Fuse Blowout	Cause: The power supply fuse is open (Transistor destroyed or short circuit). Remedy: Check input wiring or drive output for shorts/ground faults. Contact Yaskawa representative.
FUd DC Fuse Blowout	Cause: The main transistor failed. The drive failed. Remedy: Replace the regenerative unit. Replace the drive (consult Yaskawa).
nSE Node Setup Error	Cause: The node setup terminal closed during run. A Run command was issued while the node setup function was active. Remedy: Stop the regenerative unit when using the node setup function.
oC Overcurrent	Cause: A momentary power loss occurred. One of the cables has shorted out or there is a grounding problem. The load is too heavy. Noise interference. Incorrect wiring of power supply voltage detection circuits. Voltage on power supply side is very low. Remedy: Check motor cables and remove short circuits. Measure current; if too high, replace with larger capacity unit. Review noise interference handling options. Correct wiring (r1/l11, s1/l21, t1/l31).
oFA00 Option Card Connection Error at Option Port CN5-A	Cause: Option compatibility error. The option card installed into port CN5-A is incompatible with the regenerative unit. Remedy: Check if the regenerative unit supports the option card to be installed. Contact Yaskawa for assistance.
oFA01 Option Card Fault at Option Port CN5-A	Cause: Option not properly connected. The option card connection to port CN5-A is faulty. Remedy: Turn off the power and reconnect the option card.
oFA05 to oFA06 oFA10, oFA11 oFA12 to oFA17 oFA30 to oFA43 Option Card Error (CN5-A)	Cause: There is a fault in the option card. Option card or hardware is damaged. Remedy: Cycle power to the regenerative unit. If the problem continues, replace the control board or the entire regenerative unit. Contact Yaskawa or a Yaskawa representative for instructions on replacing the control board.
oFb00 Option Card Fault at Option Port CN5-B	Cause: Option compatibility error. The option card installed into port CN5-B is incompatible with the regenerative unit. Remedy: Make sure the regenerative unit supports the option card to be installed. Contact Yaskawa for assistance.
oFb01 Option Card Fault at Option Port CN5-B	Cause: Option not properly connected. The option card connection to port CN5-B is faulty. Remedy: Turn off the power and reconnect the option card.
oFb02 Option Card Fault at Option Port CN5-B	Cause: Same type of option card is currently connected. 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 at Option Port CN5-B	Cause: There is a fault in the option card. Option card or hardware is damaged. Remedy: Cycle power to the regenerative unit. If the problem continues, replace the control board or the entire regenerative unit. Contact Yaskawa or a Yaskawa representative for instructions on replacing the control board.
oFC00 Option Card Connection Error at Option Port CN5-C	Cause: Option compatibility error. The option card installed into port CN5-C is incompatible with the regenerative unit. Remedy: Confirm that the regenerative unit supports the option card to be installed. Contact Yaskawa for assistance.
oFC01 Option Card Fault at Option Port CN5-C	Cause: Option not properly connected. The option card connection to port CN5-C is faulty. Remedy: Turn the power off and reconnect the option card.
oFC02 Option Card Fault at Option Port CN5-C	Cause: Same type of option card is currently connected. 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. Make sure only one type of option card is connected.
oFC03 to oFC11 oFC12 to oFC17 Option Card Error at Option Port CN5-C	Cause: There is a fault in the option card. Option card or hardware is damaged. Remedy: Cycle power to the regenerative unit. If the problem continues, replace the control board or the entire regenerative unit. Contact Yaskawa or a Yaskawa representative for instructions on replacing the control board.
oFC50 to oFC55 Option Card Error at Option Port CN5-C	Cause: Option card is damaged. Option card or hardware is damaged. Remedy: Refer to the option manual for details.
oH Heatsink Overheat	Cause: The heatsink temperature exceeded the overheat pre-alarm level set to L8-02. Surrounding temperature is too high. Load is too heavy. Internal cooling fan is stopped. Remedy: Check the temperature surrounding the regenerative unit (verify it is within specifications). Improve the air circulation within the enclosure panel. Install a fan or air conditioner to cool the surrounding area. Remove anything near the unit producing excessive heat. Measure the output current and decrease the load. Replace the cooling fan. After replacing the fan, set parameter o4-03 to 0 to reset maintenance.
oH1 Overheat 1	Cause: The heatsink temperature exceeded the regenerative unit overheat level. Surrounding temperature is too high. Load is too heavy. Internal cooling fan is stopped. Remedy: Check the temperature surrounding the regenerative unit. Improve the air circulation within the enclosure panel. Install a fan or air conditioner to cool the surrounding area. Measure the output current and reduce the load. Replace the cooling fan. After replacing the fan, set parameter o4-03 to 0 to reset maintenance.
oL2 Overload	Cause: The thermal sensor of the regenerative unit triggered the unit overload protection. Load is too heavy. Regenerative unit capacity is too small. The regenerative unit does not operate properly. Remedy: Reduce the load. Replace the regenerative unit with a larger model. Start regenerative unit operation first, and then start drive operation.
oPr External Digital Operator Connection Fault	Cause: The external operator has been disconnected from the regenerative unit. External operator is not properly connected. Remedy: Check the connection between the operator and the regenerative unit. Replace the cable if damaged. Turn off the input power, disconnect the operator, reconnect it, and reapply power.
ov Overvoltage	Cause: Voltage in the DC bus has exceeded the overvoltage detection level (200V class: ~410V, 400V class: ~820V). A momentary power loss occurred. The regenerative load is too large. Input power voltage is too high. Unit fails to operate due to noise interference. Wiring of power supply voltage detection circuits or main circuit terminals is incorrect. Remedy: Investigate and correct the cause and reset the fault. Reduce the regenerative load. Check the voltage and lower input power voltage within limits. Review possible solutions for controlling noise (check ground wiring, etc.). Correct the wiring.
PF2 Input Power Supply Fault	Cause: Abnormal oscillation in the main circuit DC bus continued. Fluctuation in voltage of input power supply is too large. Phase loss in input power supply. Capacity of power supply is too small. Wiring is too long or phase imbalance is too large. Remedy: Investigate and correct the cause and reset the fault.
PF3 Input Phase Loss Detection	Cause: The voltage balance in the three-phase power supply has broken down. Fluctuation in voltage of input power supply is too large. Phase loss in input power supply. Capacity of power supply is too small. Wiring is too long or phase imbalance is too large. Remedy: Investigate and correct the cause and reset the fault.
SC Input Short-circuit / Main Transistor Failure	Cause: Short circuit or ground fault is detected. 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	Cause: The phase order detection direction for the input power supply changed after power was turned on. Power supply phase order changed during operation. Momentary power loss occurred. Input power supply wiring terminal is loose. Fluctuation in voltage is too large. Remedy: Investigate and correct the cause and reset the fault.
Uv1 Main Circuit Undervoltage	Cause: DC voltage became equal to or lower than the set value (L2-05). Phase loss in input power supply. Input power supply wiring terminal is loose. Fluctuation occurred in power supply voltage. A power loss occurred. Main circuit capacitor has deteriorated. Relay or contactor in inrush current protection circuit failed. Fault occurred in power supply device/wiring. Remedy: Check main circuit power supply wiring for broken wires/mistakes. Check terminals for looseness and tighten. Check voltage and correct it to be within specifications. Check magnetic contactor in the main circuit. Improve the power supply. Check maintenance period for capacitor (U4-05) and replace if needed. Cycle power; if fault persists, replace board/unit. Check maintenance period for inrush prevention relay (U4-06).
Uv2 Control Power Supply Voltage Fault	Cause: Voltage is too low for the control regenerative unit input power. Internal circuitry is damaged. Remedy: Cycle power to the regenerative unit. Check if the fault reoccurs. If the problem continues, replace either the control board or the entire regenerative unit.
Uv3 Undervoltage 3 (Soft-Charge Bypass Circuit Fault)	Cause: The soft-charge bypass circuit failed. The relay or contactor on the soft-charge bypass circuit is damaged. Remedy: Cycle power to the regenerative unit and see if the fault reoccurs. If the problem continues, replace either the control board or the entire regenerative unit. Check monitor U4-06 for the performance life of the soft-charge bypass. Replace control board/unit if U4-06 exceeds 90%.
AEr Communication Option Station Number Setting Error (CC-Link, CANopen, MECHATROLINK)	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 in the input power supply. 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, ℓ1/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 is broken or master controller stopped communicating. Option is damaged. The option is not properly connected to the regenerative unit. A data error occurred due to noise. Remedy: Check for faulty wiring, correct wiring, or repair disconnected cables/short circuits. If no wiring problems exist and fault continues, replace the option. Reinstall the option (ensure pins are lined up). Check options to minimize noise effects (shielded lines, grounding, EMC filters, surge absorbers).
CALL Serial Communication Transmission Error	Cause: Communications wiring is faulty, short circuit, or not connected properly. Programming error on the master side. Communications circuitry is damaged. Termination resistor setting is incorrect. Remedy: Check for wiring errors, correct wiring, repair cables. Check communications at start-up and correct programming errors. Perform self-diagnostics check. If problem continues, replace control board or unit. Install termination resistor at both ends. Set internal termination resistor switch (S2) to ON.
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 time required for a communication cycle. Incompatible PLC software settings or hardware problem. Communications cable is disconnected or damaged. Remedy: Minimize noise (shielded lines, grounding, EMC filters). Check H5 parameters and protocol settings in controller. Check PLC, change software settings, or set longer CE detection time (H5-09). Check PLC and remove cause of error on controller side. Check connector signals or replace 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 regenerative unit.
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. 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. Check if unused terminals have been set for H1 parameters (24 to 27, 2C to 2F). Change terminal settings if necessary.
FAn Internal Circulation Fan Fault	Cause: An internal circulation fan is faulty. An internal circulation fan or MC power supply is faulty. Remedy: Cycle power. Check operation of fans. Check U4-03/U4-04. Replace fan if expired or faulty. If fault occurs repeatedly after power cycle, replace the board or the regenerative unit.
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 or ground fault/short). 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. Refer to Diagnosing and Resetting Faults. If fuse is open: Contact Yaskawa representative. Correct the wiring (for phase rotation). Improve the power supply.
HCA Current Alarm	Cause: Load is too heavy. Remedy: Reduce the load for applications with repetitive operations (i.e., stops and starts). Replace the regenerative 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 parameter 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 regenerative unit. For instructions on replacing the control board, 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 regenerative unit. For instructions on replacing the control board, contact Yaskawa or your nearest sales representative.
oH Heatsink Overheat	Cause: Surrounding temperature is too high. Airflow around the regenerative unit is restricted. The ambient temperature is too high. The load is too large. Internal cooling fan has stopped. Remedy: Check the surrounding/ambient temperature. Improve air circulation or install a cooling device (fan/AC) within the enclosure. Remove heat-generating objects nearby. Provide proper installation space (refer to manual page 27). Clear dust or debris clogging the cooling fan. Measure output current and lower the load. Replace the cooling fan (refer to manual page 124) and reset o4-03 to 0.
oL2 Overload	Cause: Load is too heavy. The regenerative unit does not operate. Remedy: Reduce the load. Start regenerative unit operation first, and then start regenerative unit operation.
ov DC Bus Overvoltage	Cause: Electrical noise interference causes the unit to operate incorrectly. There was a regenerative load while the regenerative unit is stopped. The power supply voltage is too high. Wiring of power supply voltage detection circuits or main circuit terminals is incorrect. Remedy: Review noise interference solutions (check ground wiring, install surge protector to MC coil). Set number of fault restarts (L5-01) to a value other than 0. Operate the regenerative unit. Lower the voltage so it is within specifications. Check and correct the wiring (r1/l11, s1/l21, t1/l31 and R/L1, S/L2, T/L3).
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 input power supply for phase loss or imbalance. Investigate/correct cause and reset fault. Check r1/l11, s1/l21, t1/l31 to see if they are wired correctly.
PF3 Input Phase Loss Detection	Cause: The fluctuation in the voltage of the 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" on page 114 for details.
PFDv Power Supply Frequency Pre-Alarm	Cause: Momentary power loss has occurred. Voltage distortion is large. Voltage detection failure. Phase loss has occurred. Remedy: Activate the momentary power loss ride-thru. Increase the power supply capacity. Confirm r1/l11, s1/l21, t1/l31 are correctly wired. Confirm the power supply and regenerative unit are correctly connected.
SE MEMOBUS/Modbus Test Mode Fault	Cause: A fault occurred during MEMOBUS/Modbus Communications Test Mode. Remedy: Always stop the operation of the regenerative unit 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" on page 114 for details.
Uv Undervoltage	Cause: Phase loss in the regenerative unit input power. Loose wiring in the regenerative unit input power terminals. There is a problem with the regenerative unit input power voltage. A power loss occurred. Internal circuitry is worn. The input power transformer is too small/voltage drops when switched on. Air inside the regenerative unit is too hot. The CHARGE light is broken or disconnected. Remedy: Check for wiring errors in the main circuit input power. Correct wiring. Ensure terminals are properly tightened (Refer to Wire Gauges/Tightening Torque on page 52). Check voltage; lower voltage so it is within limits listed in specifications. Improve the power supply. Check capacitor maintenance time (U4-05). Replace board/unit if >90%. Check for alarm when magnetic contactor/breaker are closed. Check transformer capacity. Check the temperature inside the regenerative unit. Replace either the control board or the entire regenerative unit.
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	Cause: The data was corrupted by noise when writing data to the EEPROM. Remedy: Press the ENTER key. Set the parameters again. Cycle the power supply. Refer to Diagnosing and Resetting Faults. Cause: EEPROM Hardware Failure. Remedy: Replace the board or regenerative unit. Consult your Yaskawa representative.
oPE01 Unit Capacity Setting Error	Cause: The Unit Model Selection (o2-04) and the actual capacity of the regenerative unit 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: The same function is assigned to two multi-function inputs (Excludes "Not used" and "External Fault"). Remedy: Ensure all multi-function inputs (H1-01 to H1-08) are assigned to different functions. Re-enter the multi-function settings to ensure this does not occur.
oPE04 Terminal Board Mismatch Error	Cause: The regenerative unit was replaced (but the removable terminal block with parameter backup was not replaced). Remedy: Set A1-03 to 5550 to load the parameter settings stored in the terminal board to the regenerative unit. Cause: The removable terminal block with parameter backup was replaced. Remedy: Initialize parameters after regenerative unit replacement by setting A1-03 to 2220.
oPE05 Run Command Selection Error	Cause: The Run Command Selection 1 is assigned to an option card (b1-02 = 3) and an input option card is not connected to the unit. Remedy: Reconnect the input option card to the regenerative unit.
oPE07 Multi-Function Analog Input Selection Error	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. Note: Both 1F (Through mode) and F (Through mode) can be set to H3-02, H3-10, or H3-06 simultaneously.
oPE30 Incorrect Input Voltage Adjustment	Cause: The setting of o2-04 (Unit Model Selection) changed, or 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: (Normal Operation Task) Remedy: None required.
CPyE Error Writing Data	Cause: - Remedy: -
CSEr Copy Unit Error	Cause: - Remedy: -
dFPS Model Mismatch	Cause: - Remedy: -
End Task Complete	Cause: (Normal Operation Task) Remedy: None required.
iFEr Communication Error	Cause: - Remedy: -
ndAT Model, Voltage Class, Capacity Mismatch	Cause: - Remedy: -
rdEr Error Reading Data	Cause: - Remedy: -
rEAd Reading Parameter Settings (flashing)	Cause: (Normal Operation Task) Remedy: None required.
vAEr Voltage Class, Capacity Mismatch	Cause: - Remedy: -
vFyE Parameter settings in the regenerative unit and those saved to the copy function are not the same	Cause: - Remedy: -
vrFy Comparing Parameter Settings (flashing)	Cause: (Normal Operation Task) Remedy: None required.

 

How to Read R1000 Faults via DriveWizard

Diagnosing a regenerative unit requires analyzing the incoming AC power and the DC bus simultaneously. In 2026, the standard troubleshooting workflow involves:

• U2 Fault Trace Parameters: Access the “Black Box” history directly on the keypad to see the status at the moment of the trip.
  • U2-01: Current Fault Code.
  • U2-04 thru U2-20: These monitors freeze the data when the fault occurs. Pay close attention to U2-11 (DC Bus Voltage) and U2-12 (Output Voltage) to determine if the grid voltage spiked, causing the unit to protect itself.
• DriveWizard Industrial: Connecting a PC via USB allows you to use the **Oscilloscope function**. This is critical for the R1000 to verify that the unit is synchronizing correctly with the AC line frequency and to detect harmonic distortion that might be causing nuisance trips.

Frequently Asked Questions (FAQ)

Q: What is the difference between an Alarm and a Fault on the R1000?

A:

• Alarm (Flashing): The unit detects a condition (like High Internal Fan Temp) but continues to regenerate power.
• Fault (Solid): The unit detects a critical failure. The R1000 immediately stops switching (Gate Block), effectively disconnecting the DC bus from the grid. Any connected drives will lose their braking capability.

Q: How do I reset a Yaskawa R1000 fault?

A: After verifying the stability of the AC line and DC bus connections:

• Press the RESET button on the keypad.
• Trigger the “Fault Reset” digital input (Terminal S4).
• Cycle the main AC input power (Note: The display may stay lit for a long time due to the DC bus capacitors in the connected drive system).

Q: Why does the R1000 trip on “PF” (Input Phase Loss)?

A: The R1000 is very sensitive to input power quality. A PF fault indicates that one of the AC input phases dropped out or has significant voltage imbalance. Check your input fuses, wiring, and the quality of the utility feed.