Yaskawa P1000 Fault Codes

Fault codes, causes, and solutions for Yaskawa P1000 AC Variable Frequency Drive.

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Yaskawa P1000 AC Variable Frequency Drive Fault Codes
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bAT
Digital Operator Battery Voltage Low
boL
Braking Transistor Overload Fault. The braking transistor reached its overload level.
bUS
Option Communication Error. • The connection was lost after establishing initial communication. • Only detected when the run command frequency reference is assigned to an option card.
CE
MEMOBUS/Modbus Communication Error. Control data was not received for the CE detection time set to H5-09.
FAn
Internal Fan Fault. Fan or magnetic contactor failure.
FbH
Excessive PID Feedback. PID feedback input is greater than the level set to b5-36 for longer than the time set to b5-37. B5-12 is set to 1 or 4. Set b5-12 to 2 or 5 to enable fault detection.
FbL
PID Feedback Loss. PID feedback loss detection is programmed to trigger a fault (b5-12 = 2 or 5) and the PID feedback level is below the detection level set to b5-13 for longer than the time set to b5-14.
GF
Ground Fault. • A current short to ground exceeded 50% of rated current on the output side of the drive. • Setting L8-09 to 1 enables ground fault detection.
LF
Output Phase Loss. • Phase loss on the output side of the drive. • Setting L8-07 to 1 or 2 enables Phase Loss Detection.
nSE
Node Setup Error. A terminal assigned to the node setup function closed during run.
oC
Overcurrent. Drive sensors detected an output current greater than the specified overcurrent level.
oH
Heatsink Overheat. The heatsink temperature exceeded the overheat pre-alarm level set to L8-02. The default value for L8-02 is determined by drive capacity (o2-04).
oH1
Overheat 1 (Heatsink Overheat). The heatsink temperature exceeded the drive overheat level. Overheat level is determined by drive capacity (o2-04).
oH2
Drive Overheat Warning. “Drive Overheat Warning” was input to a multi-function input terminal, S1 through S8 (H1-oo= B).
oH3
Motor Overheat. The motor overheat signal entered to a multi-function analog input terminal exceeded the alarm level (H3-02, H3-06 or H3-10 = E).
oH4
Motor Overheat Fault (PTC Input). • The motor overheat signal to analog input terminal A1, A2, or A3 exceeded the fault detection level. • Detection requires setting multi-function analog inputs H3-02, H3-10, or H3-06 to E.
oL1
Motor Overload. The electronic motor overload protection tripped.
oL2
Drive Overload. The thermal sensor of the drive triggered overload protection.
oL3
Overtorque Detection 1. The current has exceeded the value set for torque detection (L6-02) for longer than the allowable time (L6-03).
oL4
Overtorque Detection 2. The current has exceeded the value set for Overtorque Detection 2 (L6-05) for longer than the allowable time (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.
oPr
External Digital Operator Connection Fault. The external operator has been disconnected from the drive. Note: An oPr fault will occur when all of the following conditions are true: •Output is interrupted when the operator is disconnected (o2-06 = 1). •The Run command is assigned to the operator (b1-02 = 0 and LOCAL has been selected).
rF
Braking Resistor Fault. The resistance of the braking resistor is too low.
rH
Braking Resistor Overheat. Braking resistor protection was triggered. Fault detection is enabled when L8-01 = 1 (disabled as a default). Note: The magnitude of the braking load trips the braking resistor overheat alarm, NOT the surface temperature. Using the braking resistor more frequently than its rating permits will trip the alarm even when the braking resistor surface is not very hot.
rr
Dynamic Braking Transistor. The built-in dynamic braking transistor failed.
SC
IGBT Short Circuit or Ground Fault.
ov (Ou)
Overvoltage. Voltage in the DC bus has exceeded the overvoltage detection level. • For 200 V class drives: approximately 410 V • For 400 V class drives: approximately 820 V (740 V when E1-01 is less than 400) • For 600 V class drives: approximately 1040 V
PF
Input Phase Loss. Drive input power has an open phase or has a large imbalance of voltage between phases. Detected when L8-05 is set 1 (enabled).
Uv (Uu)
Undervoltage. One of the following conditions was true when the drive was stopped and a Run command was entered: • DC bus voltage dropped below the level specified in L2-05. • Contactor to suppress inrush current in the drive was opened. • Low voltage in the control drive input power. This alarm outputs only if L2-01 is not 0 and DC bus voltage is under L2-05.
Uv1 (Uu1)
DC Bus Undervoltage. One of the following conditions occurred while the drive was running: • Voltage in the DC bus fell below the undervoltage detection level (L2-05). • For 200 V class drives: approximately 190 V • For 400 V class drives: approximately 380 V (350 V when E1-01 is less than 400) • For 600 V class drives: approximately 475 V The fault is output only if L2-01 is set to 0 or 1 and the DC bus voltage has fallen below the level set to L2-05 for longer than the time set to L2-02.
Uv2 (Uu2)
Control Power Supply Voltage Fault. Voltage is too low for the control drive input power.
Uv3 (Uu3)
Undervoltage 3 (Soft-Charge Bypass Circuit Fault). The soft-charge bypass circuit failed.
voF (uoF)
Output Voltage Detection Fault. Problem detected with the voltage on the output side of the drive.
vToL (utoL)
VT Overload
SEr
Too Many Speed Search Restarts. The number of Speed Search restarts exceeded the value set to b3-19.
TdE
Time Data Error
TIE
Time Interval Error
TIM
Time Not Set
UL3
Undertorque Detection 1. The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable time (L6-03).
UL4
Undertorque Detection 2. The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable time (L6-06).
UL6
Motor Underload. The weight of the load has fallen below the underload curve defined in L6-14.
CPF00 or CPF01
Control Circuit Error
CPF02
A/D Conversion Error. An A/D conversion error or control circuit error occurred.
CPF03
Control Board Connection Error. Connection error between the control board and the drive.
CPF06
EEPROM Memory Data Error. Error in the data saved to EEPROM.
CPF07
Terminal Board Connection Error
CPF08
Terminal Board Connection Error
CPF20 or CPF 21
Control Circuit Error
CPF22
Hybrid IC Failure
CPF23
Control Board Connection Error. Connection error between the control board and the drive.
CPF24
Drive Unit Signal Fault. The drive capacity cannot be detected correctly (drive capacity is checked when the drive is powered up).
CPF25
Terminal Board Not Connected.
CPF26 to CPF35, CPF40 to CPF43
Control Circuit Error. CPU error
E5
SI-T3 Watchdog Timer Error. The watchdog timed out.
EF
Forward/Reverse Run Command Input Error. Both forward run and reverse run closed simultaneously for longer than 0.5 s
EF0
Option Card External Fault. An external fault condition is present.
EF1
External Fault (input terminal S1). External fault at multi-function input terminal S1.
EF2
External Fault (input terminal S2). External fault at multi-function input terminal S2.
EF3
External Fault (input terminal S3). External fault at multi-function input terminal S3.
EF4
External Fault (input terminal S4). External fault at multi-function input terminal S4.
EF5
External Fault (input terminal S5). External fault at multi-function input terminal S5.
EF6
External Fault (input terminal S6). External fault at multi-function input terminal S6.
EF7
External Fault (input terminal S7). External fault at multi-function input terminal S7.
EF8
External Fault (input terminal S8). External fault at multi-function input terminal S8.
EoF
Emergency Override Forward Run
Eor
Emergency Override Reverse Run
Err
EEPROM Write Error. Data cannot be written to the EEPROM.
oFA00
Option Card Connection Error at Option Port CN5-A. Option compatibility error.
oFA01
Option Card Fault at Option Port CN5-A. Option not properly connected
oFA03 to oFA06 or oFA10, oFA11
Option Card Error Occurred at Option Port CN5-A.
oFA12 to oFA17
Option Card Connection Error (CN5-A)
oFA30 to oFA43
Communication Option Card Connection Error (CN5-A)
oFB00
Option Card Fault at Option Port CN5-B. Option compatibility error
oFB01
Option Card Fault at Option Port CN5-B. Option not properly connected
oFB02
Option Card Fault at Option Port CN5-B. Same type of option card is currently connected.
oFb03 to oFb11, oFb12 to oFb17
Option card error occurred at Option Port CN5-B
oFC00
Option Card Connection Error at Option Port CN5-C. Option compatibility error.
oFC01
Option Card Fault at Option Port CN5-C. Option not properly connected.
oFC02
Option Card Fault at Option Port CN5-C. Same type of option card is currently connected.
oFC03 to oFC11, oFC12 to oFC17
Option Card Error Occurred at Option Port CN5-C.
AEr
Communication Option Station Number Setting Error (CC-Link, CANopen, MECHATROLINK-II). Option card node address is outside of the acceptable setting range
bb
Baseblock. Drive output interrupted as indicated by an external baseblock signal.
boL
Braking Transistor Overload Fault. The braking transistor in the drive has been overloaded.
bUS
Option Communication Error. • The connection was lost after initial communication was established. • Assign a Run command frequency reference to the option.
CALL
Serial Communication Transmission Error. Communication has not yet been established.
CrST
Cannot Reset
dnE
Drive Disabled
HCA
Current Alarm. Drive current exceeded overcurrent warning level (150% of the rated current).
LT-1 (Lr-1)
Cooling Fan Maintenance Time. The cooling fan has reached its expected maintenance period and may need to be replaced. Note: An alarm output (H2-oo = 10) will only be triggered if both (H2-oo = 2F and H2-oo = 10) are set.
LT-2 (Lr-2)
Capacitor Maintenance Time. The main circuit and control circuit capacitors are nearing the end of their expected performance life. Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
LT-3 (Lr-3)
Soft Charge Bypass Relay Maintenance Time. The DC bus soft charge relay is nearing the end of its expected performance life. Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
LT-4 (Lr-4)
IGBT Maintenance Time (50%). IGBTs have reached 50% of their expected performance life. Note: An alarm output (H2-oo = 10) will only be triggered if H2-oo = 2F.
PASS
MEMOBUS/Modbus Comm. Test Mode Complete.
rUn
Motor Switch during Run. A command to switch motors was entered during run.
SE
MEMOBUS/Modbus Communication Test Mode Error Note: This alarm will not trigger a multi-function output terminal that is set for alarm output (H2-oo = 10).
TrPC
IGBT Maintenance Time (90%). IGBTs have reached 90% of their expected performance life.
WrUn
Waiting for Run
oPE01
Drive Capacity Setting Fault. Drive capacity and the value set to o2-04 do not match.
oPE02
Parameter Range Setting Error. Use U1-18 to find parameters set outside the range. 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.
oPE04
Initialization Required, Term Ctrl Chg.
oPE05
Run Command/Frequency Reference Source Selection Error
oPE07
Multi-Function Analog Input Selection Error. A contradictory setting is assigned to multi-function analog inputs H3-02, H3-10, or H3-06 and PID functions conflict.
oPE09
PID Control Selection Fault. PID control function selection is incorrect. Requires that PID control is enabled (b5-01 = 1 to 4).
oPE10
V/f Data Setting Error. One of the following setting errors has occurred: E1-09 ≤ E1-07 < E1-06 ≤ E1-11 ≤ E1-04.
oPE11
Carrier Frequency Setting Error. Correct the setting for the carrier frequency.
oPE28
Sequence Timer Error. One or more of the sequence timers is not set in the correct order.
End1
Excessive V/f Setting (detected only during Rotational Auto-Tuning and displayed after Auto-Tuning is complete).
End2
Motor Iron-Core Saturation Coefficient (detected only during Rotational Auto-Tuning and displayed after Auto-Tuning is complete).
End3
Rated Current Setting Alarm (displayed after Auto-Tuning is complete)
End4
Adjusted Slip Calculation Error
End5
Resistance Tuning Error
End6
Leakage Inductance Alarm
End7
No-Load Current Alarm
Er-01
Motor Data Error
Er-02
Minor Fault
Er-03
STOP Button Input
Er-04
Line-to-Line Resistance Error
Er-05
No-Load Current Error
Er-08
Rated Slip Error
Er-09
Acceleration Error
Er-11
Motor Speed Fault
Er-12
Current Detection Error
Er-13
Leakage Inductance Error
Er-17
Reverse Prohibited Error
CoPy
Parameters are being written to the drive.
CPyE
Error Writing Data
CSEr
Copy Unit Error
dFPS
Drive Model Mismatch
End
Task Complete
iFEr
Communication Error
ndAT
Model, Voltage Class, Capacity Mismatch
rdEr
Error Reading Data
rEAd
Reading Parameter Settings (flashing)
vAEr
Voltage Class, Capacity Mismatch
vFyE
Parameter settings in the drive and those saved to the copy function are not the same
vrFy
Comparing Parameter Settings (flashing)

About Drive Fault Codes

Both AC Variable Frequency Drives (VFDs) and DC Drives display fault codes when they encounter operational issues. These codes help technicians diagnose and resolve problems quickly. This tool provides fault codes, descriptions, causes, and solutions for various drive manufacturers and models.

If you can't find your specific drive model or the fault code you're experiencing, please refer to the manufacturer's documentation or contact technical support.

Understanding Drive Fault Codes

What are Drive Fault Codes?

Drive fault codes are diagnostic messages displayed by AC and DC drives to indicate specific errors or malfunctions. These codes are essential for troubleshooting and maintaining industrial motor control systems. Each manufacturer uses unique code formats, but they generally point to similar issues like overvoltage, undervoltage, overcurrent, overheating, or communication failures.

Common Drive Types

AC Variable Frequency Drives (VFDs)

VFDs control AC motors by adjusting frequency and voltage to regulate motor speed and torque. They are widely used in applications requiring variable speed control with energy efficiency.

  • Control both speed and torque
  • Energy-efficient operation
  • Smooth acceleration/deceleration
  • Regenerative braking capabilities

DC Drives

DC drives control DC motors by adjusting the armature voltage and sometimes the field current. They excel in applications requiring high starting torque and precise speed control.

  • High starting torque
  • Simple control architecture
  • Wide speed range control
  • Quick response to command changes

Common Drive Fault Categories

Power-Related Faults

  • Input phase loss
  • Overvoltage during acceleration/deceleration
  • Undervoltage conditions
  • DC bus voltage issues

Thermal Faults

  • Drive overheating
  • Motor overtemperature
  • Heatsink thermal issues
  • Cooling system failures

Communication Faults

  • Fieldbus communication errors
  • Serial communication timeout
  • Network connection issues
  • Protocol compatibility problems

Motor/Load Faults

  • Motor overload
  • Output phase loss
  • Overcurrent during acceleration
  • Ground/earth faults

Troubleshooting Best Practices

When troubleshooting drive fault codes, always follow these best practices:

  1. Document the exact fault code and conditions when it occurred
  2. Check for simple issues first (loose connections, overloaded motor)
  3. Verify input power quality and stability
  4. Inspect the motor and load for mechanical issues
  5. Examine environmental conditions (temperature, humidity, dust)
  6. Consult manufacturer documentation for specific guidance

Popular Drive Manufacturers

Our database includes fault codes from leading drive manufacturers including:

  • ABB
  • Siemens
  • Allen Bradley / Rockwell Automation
  • Schneider Electric
  • Danfoss
  • Yaskawa
  • Mitsubishi Electric
  • Eaton
  • Emerson
  • Fuji Electric

For additional resources on drive maintenance and troubleshooting, check out our Drive Maintenance Guide and Motor Sizing Calculator.

Frequently Asked Questions

How do I reset a drive fault code?

What causes overcurrent faults in drives?

What's the difference between AC and DC drives?

Can I view fault history on a drive?

How can I prevent common drive faults?