Yaskawa E7 Drive

Yaskawa E7 Drive Fault Codes:

Fault Code and MeaningCause and Remedy
BUS
Option Communication Error
Cause:

After initial communication was established, the connection was lost. Connection is broken or master has stopped communicating.



Remedy:


  • Check all connections.

  • Verify all user-side software configurations.
CE
Memobus Com Err
Cause:

Modbus Communication Error: Control data was not received correctly for two seconds. Connection is broken or master has stopped communicating.



Remedy:


  • Check all connections.

  • Verify all user-side software configurations.
CPF00
Operator Communication Fault 1
Cause:

Transmission between the Drive and the digital operator cannot be established within 5 seconds after supplying power.

– Digital operator cable not securely connected.

– Digital operator defective.

– Control board defective.

– External RAM of CPU is defective (Control circuit damage).



Remedy:


  • Remove the digital operator once and then reinstall it.

  • Cycle power off and on to the Drive.

  • Replace the Drive.
CPF01
Operator Communication Fault 2
Cause:

After communication started with the digital operator, a communication fault occurred for 2 seconds or more.

– Digital operator cable not securely connected.

– Digital operator defective.

– Control board defective.



Remedy:


  • Remove the digital operator once and then reinstall it.

  • Cycle power off and on to the Drive.

  • Replace the Drive.
CPF02
BB Circuit Err
Cause:

Baseblock Circuit Fault at power-up (Gate array hardware failure during power-up).



Remedy:


  • Perform a factory initialization.

  • Cycle power off and on to the Drive.

  • Replace the control board.
CPF03
EEPROM Error
Cause:

EEPROM fault, check sum not valid. Noise or spike on the control circuit input terminals.



Remedy:


  • Perform a factory initialization.

  • Cycle power off and on to the Drive.

  • Replace the control board.
CPF04
Internal A/D Err
Cause:

CPU Internal A/D Converter Fault. Noise or spike on the control circuit input terminals.



Remedy:


  • Perform a factory initialization.

  • Cycle power off and on to the Drive.

  • Replace the control board.
CPF05
External A/D Err
Cause:

CPU External A/D Converter Fault. Noise or spike on the control circuit input terminals.



Remedy:


  • Perform a factory initialization.

  • Cycle power off and on to the Drive.

  • Replace the control board.
CPF07
RAM-Err
Cause:

ASIC Internal RAM Fault. Control circuit damage.



Remedy:


  • Cycle power off and on to the Drive.

  • Replace the Drive.
CPF08
WAT-Err
Cause:

Watchdog Timer Fault. Control circuit damage.



Remedy:


  • Cycle power off and on to the Drive.

  • Replace the Drive.
CPF09
CPU-Err
Cause:

CPU-ASIC Mutual Diagnosis Fault (COY). Control circuit damage.



Remedy:


  • Cycle power off and on to the Drive.

  • Replace the Drive.
CPF10
ASIC-Err
Cause:

ASIC Version Fault. Control circuit damage.



Remedy:


  • Replace the Drive.
CPF20
Option A/D Error
Cause:

Option Card Fault.

– Option card connector connection fault.

– Option card A/D converter fault.



Remedy:


  • Remove all inputs to the option board.

  • Perform a factory initialization.

  • Cycle power off and on to the Drive.

  • Replace the option board.

  • Replace the Control board.
CPF21
Option CPU Down
Cause:

Self-diagnosis Fault of Communication Option Card. Noise or spike on the communication line, defective option board.



Remedy:


  • Perform a factory initialization.

  • Cycle power off and on to the Drive.

  • Replace the option board.

  • Replace the control board.
CPF22
Option Type Err
Cause:

Communication Option Card Code Number Fault. Unrecognizable option board is connected to the control board.



Remedy:


  • Remove any option boards.

  • Cycle power off and on to the Drive.

  • Perform a factory initialization.

  • Replace the option board.

  • Replace the control board.
CPF23
Option DPRAM Err
Cause:

Communication Option Card Interconnection Fault. An option board is not correctly connected to the control board or an option board that is not made for the Drive is attached.



Remedy:


  • Remove power to the Drive.

  • Connect the option board once more.

  • Perform a factory initialization.

  • Cycle power off and on to the Drive.

  • Replace the option board.

  • Replace the control board.
EF0
Opt External Flt
Cause:

Communication Option Card External Fault. An external fault condition exists.



Remedy:


  • Check for an external condition.

  • Verify the parameters.

  • Verify communication signal.
EF3
Ext Fault S3
Cause:

External Fault at Terminal S3. An external fault condition exists connected to a multi-function digital input.



Remedy:


  • Eliminate the cause of an external fault condition.

  • Remove the fault from a multi-function digital input.
EF4
Ext Fault S4
Cause:

External Fault at Terminal S4. An external fault condition exists connected to a multi-function digital input.



Remedy:


  • Eliminate the cause of an external fault condition.

  • Remove the fault from a multi-function digital input.
EF5
Ext Fault S5
Cause:

External Fault at Terminal S5. An external fault condition exists connected to a multi-function digital input.



Remedy:


  • Eliminate the cause of an external fault condition.

  • Remove the fault from a multi-function digital input.
EF6
Ext Fault S6
Cause:

External Fault at Terminal S6. An external fault condition exists connected to a multi-function digital input.



Remedy:


  • Eliminate the cause of an external fault condition.

  • Remove the fault from a multi-function digital input.
EF7
Ext Fault S7
Cause:

External Fault at Terminal S7. An external fault condition exists connected to a multi-function digital input.



Remedy:


  • Eliminate the cause of an external fault condition.

  • Remove the fault from a multi-function digital input.
FBL
Feedback Loss
Cause:

PI Feedback Loss. PI Feedback source (e.g. transducer, sensor, building automation signal) is not installed correctly or is not working.



Remedy:


  • Verify Drive is programmed to receive the PI Feedback source signal.

  • Check to ensure the PI Feedback source is installed and working properly.
GF
Ground Fault
Cause:

Drive output grounding current has exceeded 50% of the Drive rated output current. Motor lead is shorted to ground, DCCT defective.



Remedy:


  • Remove the motor and run the Drive without the motor.

  • Check the motor for a phase to ground short.

  • Check the output current with a clamp on meter to verify the DCCT reading.
LF
Output Phase Loss (Output Open-phase)


An open-phase occurred at the Drive output. This fault is detected when output current has exceeded 5% imbalance.
Cause: There is a broken wire in the output cable or motor winding; output terminals were loose; motor capacity less than 5% of Drive max; low impedance motor used; or Parameter E2-03 set incorrectly.



Remedy:

  • Check the wiring to the motor.

  • Check the motor for phase to ground short.

  • Check the motor and Drive capacity.

  • Add additional impedance.

  • Adjust E2-03 to a lower value.
LL3
Loss of Load Det 1 (Loss of Load Detection 1)


Drive output current < L6-02 for more than the time set in L6-03.
Cause: Motor is underloaded.



Remedy:

  • Ensure the values in L6-02 and L6-03 are appropriate.

  • Check application/machine status to eliminate fault.
OC
Over Current


Drive output current exceeded the overcurrent detection level (approximately 180% of Drive rated output current).
Cause: Shorted Drive output phase to phase, shorted motor, locked rotor, load too heavy, accel/decel time too short, contactor on the Drive output is opened and closed, a special motor or a motor with a FLA rating larger than Drive rated output current.



Remedy:

  • Remove the motor and run the Drive without the motor.

  • Check the motor for a phase-to-phase short.

  • Check the Drive for a phase-to-phase short at the output.

  • Verify C1-01 and C1-02 are set correctly.

  • Check load conditions.
OH1
Heatsnk MAX Temp (Cooling Fin Overheat)


The temperature of the Drive cooling fin exceeded the temperature programmed in parameter L8-02, and L8-03=0-2. Drive Internal Cooling Fan issue.
Cause: Cooling fan(s) are not working, high ambient temperature, a heat source is too close to the Drive.



Remedy:

  • Check for dirt build-up on the fans and cooling fins.

  • Reduce the ambient temperature around the Drive.

  • Remove the heating unit/Replace the cooling fan.
OH3
Motor Overheat 1 (Motor Overheating Alarm)


The Drive stops or continues operation according to the setting of L1-03.
Cause: Overheating of motor as measured by motor thermistor.



Remedy:

  • Recheck the cycle time and the size of the load.

  • Recheck the accel/decel time (C1-01 and C1-02).

  • Recheck the V/F pattern (E1-01 thru E1-13).

  • Recheck the motor rated current value (E2-01).
OH4
Motor Overheat 2 (Motor Overheating Fault)


The Drive stops operation according to the setting of L1-04.
Cause: Overheating of motor as measured by motor thermistor.



Remedy:

  • Recheck the cycle time and the size of the load.

  • Recheck the accel/decel time (C1-01 and C1-02).

  • Recheck the V/F pattern (E1-01 thru E1-13).

  • Recheck the motor rated current value (E2-01).
OL1
Motor Overloaded


Designed to protect the motor. Fully adjustable from parameter E2-01.
Cause: The load is too large; cycle time is too short at the accel/decel time; V/F pattern voltage is high; or motor rated current setting is improper.



Remedy:

  • Recheck the cycle time and the size of the load as well as the times set in C1-01 and C1-02.

  • Review the V/F pattern parameters, E1-01 thru E1-13.

  • Check the motor rated current value in E2-01.
OL2
Inv Overloaded (Drive Overload)


Designed to protect the Drive.
Cause: The load is too large; cycle time is too short at the accel/decel time; V/F pattern voltage is high; or the size of the Drive is small.



Remedy:

  • Recheck the cycle time and the size of the load as well as the times set in C1-01 and C1-02.

  • Review the V/F pattern parameters, E1-01 thru E1-13.

  • Change to a larger size Drive.
OL3
Overtorque Det 1 (Overtorque Detection 1)


Drive output current > L6-02 for more than the time set in L6-03.
Cause: Motor is overloaded.



Remedy:

  • Ensure the values in L6-02 and L6-03 are appropriate.

  • Check application/machine status to eliminate fault.
OPR
Oper Disconnect (Digital Operator Connection Fault)


The Drive will stop if the digital operator is removed when the Drive is commanded to run through the digital operator.
Cause: The digital operator is not attached or the digital operator connector is broken.



Remedy:

  • Attach the digital operator.

  • Check the digital operator connector.

  • Verify the setting of o2-06.
OV
DC Bus Overvolt (DC Bus Overvoltage)


208-240Vac: Trip point is ≥ 400Vdc
480Vac: Trip point is ≥ 800Vdc
Cause: High input voltage at R/L1, S/L2 and T/L3; deceleration time set too short; or Power factor correction capacitors are being used on the input.



Remedy:

  • Check the input circuit and reduce the input power to within specifications.

  • Extend the time in C1-02.

  • Remove the power factor correction capacitors.
PF
Input Pha Loss (Input Phase Loss)


Drive input power supply has an open phase or has a large imbalance of input voltage.
Cause: Open phase on input of the Drive; Loose terminal screws at R/L1, S/L2 or T/L3; Momentary power loss; Input voltage fluctuation too large; Parameter L8-06 value set incorrectly.



Remedy:

  • Check the input voltage.

  • Tighten the terminal screws.

  • Verify parameter L8-06 is set correctly per the kVA tables (pages C-2 and C-3). Adjust L8-06 according to your application.

  • CAUTION: Changing L8-06 from factory default may cause Drive failure and void warranty. Consult factory for assistance.
PUF
DC Bus Fuse Open


Detects if the DC bus fuse has opened.
Cause: Shorted output transistor(s) or terminals.



Remedy:

  • Remove power from the Drive.

  • Disconnect the motor.

  • Perform the checks without power in Table 6.6.

  • Replace the shorted component(s).

  • Replace the defective fuse.
RH
DynBrk Resistor (Dynamic Braking Resistor)


The protection of the dynamic braking resistor based on setting of L8-01.
Cause: Overhauling load, extended dynamic braking duty cycle, defective dynamic braking resistor.



Remedy:

  • Verify dynamic braking duty cycle.

  • Monitor DC bus voltage.

  • Replace dynamic braking resistor.
RR
DynBrk Transistr (Dynamic Braking Transistor)


The dynamic braking transistor is not operating properly.
Cause: Shorted dynamic braking transistor, high DC bus voltage, defective dynamic braking resistor.



Remedy:

  • Cycle power off and on to the Drive.

  • Replace defective dynamic braking transistor or resistor.

  • Monitor DC bus voltage.
UV1
DC Bus Undervolt (DC Bus Undervoltage)


The DC bus voltage is ≤ L2-05.
208-240Vac: Trip point is ≤ 190Vdc
480Vac: Trip point is ≤ 380Vdc
Cause: Low input voltage at R/L1, S/L2 and T/L3; acceleration time set too short; or voltage fluctuation of the input power is too large.



Remedy:

  • Check the input circuit and increase the input power to within specifications.

  • Extend the time in C1-01.

  • Check the input voltage.
UV2
CTL PS Undervolt (Control Power Supply Undervoltage)


Undervoltage of the control circuit when running.
Cause: External load connected pulling down the Drive power supplies.



Remedy:

  • Cycle power off and on to the Drive.

  • Repair or replace the Power PCB/Gate Drive PCB.

  • Remove all control wiring and test Drive.
UV3
MC Answerback (Soft Charge Circuit Fault)


The pre-charge contactor opened while the Drive was running.
Cause: Contacts on the soft charge contactor are dirty and the soft charge contactor does not function mechanically.



Remedy:

  • Cycle power off and on to the Drive.

  • Check the condition of the soft charge contactor.

  • Repair or replace the Power PCB/Gate Drive PCB.
BUS
Option Com Err
Cause: Connection is broken, master has stopped communicating.



Remedy:

  • Check all connections.

  • Verify all user side software configurations.
CALL
SI-F/G ComCall
Cause: Connection not made properly, user software not configured to the proper baud rate or configuration.



Remedy:

  • Check all connections.

  • Verify all user side software configurations.
EF
External Fault
Cause: An external forward and reverse command are input simultaneously for 500mS or more.



Remedy:

  • Check external sequence logic.
EF0
Opt External Flt (Flashing)
Cause: An external fault condition exists (Communication Option Card).



Remedy:

  • Check for an external condition.

  • Verify the parameters.

  • Verify communication signal.
EF3
Ext Fault S3 (Flashing)
Cause: An external fault condition exists connected to multi-function digital input S3.



Remedy:

  • Eliminate the cause of an external fault condition.
EF4
Ext Fault S4 (Flashing)
Cause: An external fault condition exists connected to multi-function digital input S4.



Remedy:

  • Eliminate the cause of an external fault condition.
EF5
Ext Fault S5 (Flashing)
Cause: An external fault condition exists connected to multi-function digital input S5.



Remedy:

  • Eliminate the cause of an external fault condition.
EF6
Ext Fault S6 (Flashing)
Cause: An external fault condition exists connected to multi-function digital input S6.



Remedy:

  • Eliminate the cause of an external fault condition.
EF7
Ext Fault S7 (Flashing)
Cause: An external fault condition exists connected to multi-function digital input S7.



Remedy:

  • Remove the fault from a multi-function digital input.
DNE
Drive not Enable (Flashing)
Cause: The Run command has been applied prior to the enable signal.



Remedy:

  • Apply the enable command before applying the run command.
FAN
Cooling Fan Error
Cause: Drive cooling fan has stopped (Failure of Drive internal cooling fan).



Remedy:

  • Replace the cooling fan.
FBL
Feedback Loss
Cause: PI Feedback source (e.g. transducer, sensor) is not installed correctly or is not working.



Remedy:

  • Verify Drive is programmed to receive the PI Feedback source signal.

  • Check to ensure the PI Feedback source is installed and working properly.

  • Check the motor for a phase-to-phase short.

  • Check the Drive for a phase-to-phase short at the output.

  • Verify C1-01 and C1-02 are set correctly.

  • Check load conditions.
LL3
Loss of Load Det 1 (Flashing)
Cause: Motor is underloaded (Drive output current < L6-02 for more than time set in L6-03).



Remedy:

  • Ensure the values in L6-02 and L6-03 are appropriate.

  • Check application/machine status to eliminate fault.
OH
Heatsnk Overtemp (Flashing)
Cause: Cooling fan(s) are not working, high ambient temperature, or a heating unit is in close proximity to Drive.



Remedy:

  • Check for dirt build-up on the fans and cooling fins.

  • Reduce the ambient temperature around the Drive.

  • Remove the heating unit.
OH2
Over Heat 2 (Flashing)
Cause: An external overheat condition exists connected to one of the multi-function input terminals S3, S4, S5, S6 or S7.



Remedy:

  • Check for an external condition.

  • Verify the program parameters H1-01 thru H1-05.
OH3
Motor Overheat 1 (Flashing)
Cause: Overheating of motor.



Remedy:

  • Recheck the cycle time and the size of the load.

  • Recheck the accel/decel time (C1-01 and C1-02).

  • Recheck the V/F pattern (E1-01 thru E1-13).

  • Recheck the motor rated current value (E2-01).

  • Check the digital operator connector.

  • Verify the setting of o2-06.
OV
DC Bus Overvolt (Flashing)
Cause: High input voltage, deceleration time set too short, or power factor correction capacitors are used.



Remedy:

  • Check the input circuit and reduce the input power to within specifications.

  • Extend the time in C1-02.

  • Remove the power factor correction capacitors.
OVRD
Emergcy Override
Cause: Forward or Reverse Emergency Override input is closed.



Remedy:

  • If Forward/Reverse Emergency Override is closed, the drive runs at B1-14 reference.

  • Note: If Drive Enable (H1-0X = 6A) or Bypass Drive Enable is programmed, emergency override can only be activated when Enable input is open.

  • If Enable input is closed during emergency override, the drive will stop.
PRHT
Motor Preheating
Cause: Motor Preheat 2 input is closed.



Remedy:

  • No corrective action specified (- – -).
UV
DC Bus Undervolt (Flashing)
Cause: Low input voltage, acceleration time too short, or voltage fluctuation too large.



Remedy:

  • Check the input circuit and increase the input power to within specifications.

  • Extend the time in C1-01.

  • Check the input voltage.
UV2
CTL PS Undervolt
Cause: External load connected pulling down the Drive power supplies.



Remedy:

  • Cycle power off and on to the Drive.

  • Repair or replace the Power PCB/Gate Drive PCB.
UV3
MC Answerback
Cause: Contacts on the soft charge contactor are dirty and the soft charge contactor does not function mechanically.



Remedy:

  • Cycle power off and on to the Drive.

  • Check the condition of the soft charge contactor.
OPE01
kVA Selection
Cause: Drive kVA setting error. The control board was replaced and the kVA parameter is set incorrectly.



Remedy:

  • Enter the correct kVA setting (o2-04) by referring to the Drive model number in Appendix B.
OPE02
Limit
Cause: Constant data out of range. Parameter set above the allowable range.



Remedy:

  • Verify the program settings.
OPE03
Terminal
Cause: Multi-function input selection fault. Duplicate functions are selected, up/down commands or trim control increase/decrease are not set simultaneously. Speed search from maximum frequency and set frequency are set simultaneously. Emergency override FWD (H1-0X = 81) and Emergency Override REV (H1-0X = 82) are set simultaneously.



Remedy:

  • Verify program settings (H1-01~H1-05).
OPE05
Sequence Select
Cause: Run command is selected through serial communication at 2CN but option board is not installed. Serial communication option board is not installed, option board is installed incorrectly. The run command selection parameter B1-02 is set to 3 and option board is not installed.



Remedy:

  • Verify that the board is installed.

  • Remove power to the Drive and connect the option board once more.
OPE09
PID Selection
Cause: PID Control Setup Error. The following settings have been made at the same time: b5-01 (PID Control Method Selection) has been set to a value other than 0. b5-15 (PID Sleep Function Start Level) has been set to a value other than 0. b1-03 (Stopping Method Selection) was set to 2 or 3.



Remedy:

  • Check parameters b5-01, b5-15, and b1-03 and correct the error.
OPE10
V/f Ptrn Setting
Cause: V/f data setting fault. V/f parameter settings are not set correctly.



Remedy:

  • Check parameters (E1-04 ~ E1-11).

  • A minimum frequency/voltage value may be set higher than the maximum frequency/voltage.
OPE11
CarrFrq/On-Delay
Cause: Carrier frequency data setting fault. Carrier frequency proportional gain C6-05 > 6 and C6-04 > C6-03. Upper/lower limit error of C6-03 to 5.0kHz. Parameter setting incorrect.



Remedy:

  • Check the program settings and correct the errors.
ERR
EEPROM R/W Err
Cause: It does not match at EEPROM write. Power supply is turned OFF. Parameter is reset repeatedly.



Remedy:

  • Cycle power off and on to Drive.

  • Do a factory initialization (A1-03).
Er – 01
Fault
Cause: There is an error in the data input for autotuning. There is an error in the relationship between the motor output and the motor rated current.



Remedy:

  • Check input data.

  • Check Drive and motor capacity.

  • Check motor rated current.
Er – 02
Minor Fault
Cause: A minor fault is detected during auto-tuning.



Remedy:

  • Check input data.

  • Check wirings and around the machine.

  • Check the load.
Er – 03
STOP key
Cause: The STOP key is pressed during auto-tuning, and the auto-tuning is interrupted.



Remedy:

  • – (Press Run to restart or check operation sequence)
Er – 04
Resistance
Cause: Auto-tuning is not completed within the specified time. The auto-tuning result became other than the parameter set range.



Remedy:

  • Check input data.

  • Check motor wiring.

  • If a motor and a machine are connected, disconnect the motor from the machine.
Er – 12
I-det. Circuit
Cause: Current flow exceeded the motor rated current. Current detection value symbol was reversed. Any of U/TI, V/T2, and W/T3 has open-phase.



Remedy:

  • Check current detection circuit, wiring and mounting procedure.
Er – 13
Leakage Inductance Fault
Cause: Auto-tuning did not finish within the set time. Tuning result became other than the parameter setting range.



Remedy:

  • Check motor wiring.
End – 3
Data Invalid
Cause: Rated current set value is set too high.



Remedy:

  • Check input data (especially, motor output current and motor rated current value).
PRE
READ IMPOSSIBLE
Cause: o3-01 was set to 1 to write a parameter when the Digital Operator was write-protected (o3-02 = 0).



Remedy:

  • Set o3-02 to 1 to enable writing parameters with the Digital Operator.
IFE
READ DATA ERROR
Cause: The read data length does not agree. The write data is incorrect.



Remedy:

  • Repeat the Read.

  • Check the Digital Operator cable.

  • Replace digital operator.
RDE
DATA ERROR
Cause: An attempted write of a parameter to EEPROM on the Digital Operator failed.



Remedy:

  • A low Inverter voltage has been detected.

  • Repeat the read.

  • Replace Digital Operator.
CPE
ID UNMATCHED
Cause: The Drive product code or software number is different.



Remedy:

  • Use COPY function for the same product code and software number.
VAE
INV. KVA UNMATCH
Cause: The capacity of the Drive being copied and the capacity in the Digital Operator are different.



Remedy:

  • Use COPY function for the same Drive capacity.
CRE
CONTROL UNMATCHED
Cause: The control method of the Drive being copied and the control method in the Digital Operator are different.



Remedy:

  • Use the COPY function for the same control method.
CYE
COPY ERROR
Cause: The parameter written to the Drive was compared with the parameter in the Digital Operator and they were different.



Remedy:

  • COPY retest.
CSE
SUM CHECK ERROR
Cause: The checksum in the Drive parameter area was compared with the checksum in the Digital Operator parameter area and they were different.



Remedy:

  • Retry the copy.
VYE
VERIFY ERROR
Cause: The set value of the digital operator and the Drive do not match.



Remedy:

  • Retry Verify function.

  • After COPY is retested, Verify is retested.