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Yaskawa F7 Drive Fault Codes & Alarms

Model: CIMR-F7U | Precision Electronic Services

Below is a complete listing of the fault codes, alarms, and auto-tuning faults for the Yaskawa F7 Drive (Model: CIMR-F7U). Each entry includes the display code shown on the Digital Operator, a description of the condition, the most likely cause, and recommended corrective action.

Understanding the difference between a Fault and an Alarm:

Fault: Trips the drive, activates the fault contact output, and coasts the motor to a stop. The fault must be manually reset before the drive can restart. Reset by toggling a digital input programmed as Fault Reset (14), pressing the RESET key on the Digital Operator, or cycling power.

Alarm: A warning condition only. The display flashes and the drive continues to run. Alarms clear automatically once the underlying condition is resolved.

Fault Codes — Table 6.1

BUS — Option Com Err

Option Communication Error. After initial communication was established, the connection was lost.
Cause: Connection broken and/or master controller stopped communicating.
Action: Check all connections; verify all user-side software configurations.

 

CE — Memobus Com Err

Modbus Communication Error. Control data not received correctly for 2 seconds (H5-05=1, H5-04=0–2).
Cause: Connection broken and/or master has stopped communicating.
Action: Check all connections; verify all user-side software configurations.

 

CF — Out of Control

Control Fault. Torque limit reached continuously for 3+ seconds during a ramp to stop in open-loop vector control.
Cause: Motor parameters were not set properly.
Action: Check motor parameters; perform Auto-Tuning.

 

CPF00 — COM-ERR(OP&INV)

Operator Communication Fault. Transmission between Drive and Digital Operator not established within 5 seconds of power-up. External RAM of CPU was defective.
Cause: Digital Operator cable not securely connected, Operator defective, and/or control board defective.
Action: Reinstall the Digital Operator; cycle power; replace the control board.

 

CPF01 — COM-ERR(OP&INV)

Operator Communication Fault. After communication started, communication stopped for 2 seconds or more.
Cause: Digital Operator cable not securely connected, Operator defective, and/or control board defective.
Action: Reinstall the Digital Operator; cycle power; replace the Digital Operator and/or control board.

 

CPF02 — BB Circuit Err

Baseblock Circuit Fault detected at power-up.
Cause: Gate array hardware failure during power-up.
Action: Perform factory initialization; cycle power; replace the control board.

 

CPF03 — EEPROM Error

EEPROM Fault. Checksum was not valid.
Cause: Noise or spike on the control circuit input terminals.
Action: Perform factory initialization; cycle power; replace the control board.

 

CPF04 — Internal A/D Err

CPU Internal A/D Converter Fault.
Cause: Noise or spike on the control circuit input terminals.
Action: Cycle power; replace the control board.

 

CPF05 — External A/D Err

External A/D Converter Fault.
Cause: Noise or spike on the control circuit input terminals.
Action: Perform factory initialization; cycle power; replace the control board.

 

CPF06 — Option Error

Option Board Connection Error.
Cause: Option board not connected properly, or Drive/option board was damaged.
Action: Turn off power and reinstall the option board; replace option board or Drive as needed.

 

CPF07 — RAM-Err

ASIC Internal RAM Fault.
Cause: Control circuit failure or damage.
Action: Cycle power; replace the Drive.

 

CPF08 — WAT-Err

Watchdog Timer Fault.
Cause: Control circuit failure or damage.
Action: Cycle power; replace the Drive.

 

CPF09 — CPU-Err

CPU-ASIC Mutual Diagnosis Fault.
Cause: Control circuit damage.
Action: Cycle power; replace the Drive.

 

CPF10 — ASIC-Err

ASIC Version Fault.
Cause: Control circuit damage.
Action: Replace the Drive.

 

CPF20 — Option A/D Error

Option Card Fault.
Cause: Option board input fault or A/D conversion fault.
Action: Remove all inputs to option board; perform factory initialization; cycle power; replace option board and/or control board.

 

CPF21 — Option CPU Down

Self-Diagnosis Fault of Option Board.
Cause: Noise or spike on communication line and/or defective option board.
Action: Perform factory initialization; cycle power; replace option board and/or control board.

 

CPF22 — Option Type Err

Option Board Code Number Fault.
Cause: Unrecognizable option board connected to the control board.
Action: Remove option boards; cycle power; perform factory initialization; replace option board or control board.

 

CPF23 — Option DPRAM Err

Option Board Interconnection Fault.
Cause: Option board not correctly connected or incompatible option board attached.
Action: Remove power; reconnect option board; perform factory initialization; cycle power; replace as needed.

 

DEV — Speed Deviation

Excessive Speed Deviation (F1-04=0–2, A1-02=3). Speed deviation greater than F1-10 for longer than F1-11.
Cause: Load locked; accel/decel too short; load too large; F1-10/F1-11 settings incorrect; brake engaged; or bad encoder wiring/settings.
Action: Reduce load; lengthen accel/decel times; check mechanical system; verify F1-10 and F1-11; confirm brake releases properly; verify encoder wiring (F1 group).

 

EF0 — Opt External Flt

Option Board External Fault.
Cause: External fault condition is present.
Action: Check for an external condition; verify parameters; verify communication signal.

 

EF3–EF8 — Ext Fault S3–S8

External Fault at Terminals S3 through S8. Detected when terminals are programmed for ramp to stop, coast to stop, or fast stop.
Cause: External fault condition present on a multi-function digital input.
Action: Eliminate the cause of the external fault condition.

 

E5 — SI-T WDT Err

SI-T Watchdog Error. Consistency error of received control data.
Cause: Synchronization error between master controller and Drive for control data.
Action: Check communications timing (cycle, etc.); refer to SI-T manual.

 

E-15 — SI-F/G Com Err

SI-F/G Communication Error. Detected when run command or frequency reference is set from the SI-F/G Option Card and communication is lost.
Cause: Communication lost to the SI-F/G option card (b1-01=3 and/or b1-02=3).
Action: Check communication signals; verify settings of b1-01, b1-02, and F6-01; check host communication configuration.

 

FAN — Cooling FAN Err

Drive Cooling Fan Fault. Detected when L8-32 is set to 1.
Cause: Drive continued running with an overload after the cooling fan stopped.
Action: Replace the cooling fan.

 

FBL — Feedback Loss

PID Feedback Loss. Detected when b5-12=2 and PID Feedback is below b5-13 for time b5-14.
Cause: PID feedback source (transducer, sensor, building automation signal) not installed correctly or not working.
Action: Verify Drive is programmed to receive the PID feedback signal; confirm feedback source is installed and working properly.

 

GF — Ground Fault

Output Ground Fault. Drive output grounding current exceeded 50% of Drive rated output current (L8-09=1).
Cause: Motor lead shorted to ground and/or defective DCCT.
Action: Remove motor and run Drive alone; check motor for phase-to-ground short; verify DCCT reading with a clamp-on meter.

 

LF — Output Phase Loss

Output Open-Phase. Detected when output current has exceeded 5% imbalance and L8-07=1.
Cause: Loose output terminals; motor capacity less than 5% of Drive maximum; or low impedance motor.
Action: Check motor and Drive capacity; add additional impedance if needed.

 

OC — Over Current

Overcurrent. Drive output current exceeded approximately 200% of Drive rated output current.
Cause: Shorted Drive output, shorted motor, locked rotor, heavy load, accel/decel too short, contactor on output, or motor FLA greater than Drive rated output current.
Action: Remove motor and test Drive alone; check for phase-to-phase short at Drive output and motor; verify C1-01 and C1-02; check load conditions.

 

OH — Heatsink Overtemp

Heatsink Overheat. Drive heatsink temperature exceeded the setting in L8-02 (L8-03=0–2).
Cause: Heat source nearby; high ambient temperature; cooling fan(s) stopped; internal cooling fan stopped (F7U2018/4018 and larger).
Action: Check for dirt build-up on fans and heatsink; reduce ambient temperature; replace cooling fan.

 

OH1 — Heatsink Max Temp

Heatsink Overheat. Drive heatsink temperature exceeded 105°C.
Cause: Heat source nearby; high ambient temperature; cooling fan(s) stopped; internal cooling fan stopped (F7U2011/4011 and larger).
Action: Check for dirt build-up on fans and heatsink; reduce ambient temperature; replace cooling fan.

 

OH3 — Motor Overheat 1

Motor Overheating 1. A2 or A3 programmed for motor temperature (H3-09 or H3-05=E), exceeds 1.17V for time L1-05, and L1-03=0–2.
Cause: Motor overheating as measured by motor thermistor.
Action: Recheck cycle time, load, accel/decel times (C1-01/C1-02), V/F pattern (E1-01–E1-13), and motor rated current (E2-01).

 

OH4 — Motor Overheat 2

Motor Overheating 2. A2 or A3 programmed for motor temperature (H3-09 or H3-05=E), exceeds 2.34V for time L1-05, and L1-03=0–2.
Cause: Motor overheating as measured by motor thermistor.
Action: Recheck cycle time, load, accel/decel times (C1-01/C1-02), V/F pattern (E1-01–E1-13), and motor rated current (E2-01).

 

OL1 — Motor Overloaded

Motor Overload. Detected when L1-01=1–3 and Drive output current exceeded the motor overload curve (adjustable via E2-01, L1-01, and L1-02).
Cause: Load too large; cycle time too short; incorrect V/F pattern; or improper motor rated current setting.
Action: Recheck cycle time, load, accel/decel times (C1-01/C1-02), V/F pattern (E1-01–E1-13), and motor rated current (E2-01).

 

OL2 — Inv Overload

Drive Overload. Drive output current exceeded the Drive's overload curve.
Cause: Load too large; accel/decel too short; incorrect V/F pattern; or Drive undersized for the application.
Action: Recheck cycle time and load; review V/F pattern (E1-01–E1-13); upsize the Drive if needed.

 

OL3 — Overtorque Det 1

Overtorque Detection 1. Output current > L6-02 for longer than L6-03 (L6-01=3 or 4).
Cause: Motor was overloaded.
Action: Verify L6-02 and L6-03 settings; check application/machine status to eliminate fault.

 

OL4 — Overtorque Det 2

Overtorque Detection 2. Output current > L6-05 for longer than L6-06 (L6-04=3 or 4).
Cause: Motor was overloaded.
Action: Verify L6-05 and L6-06 settings; check application/machine status to eliminate fault.

 

OL7 — HSB OL

High Slip Braking OL. Output frequency held constant for longer than n3-04 during high slip braking.
Cause: Load inertia is too large.
Action: Confirm load is inertial; reduce load inertia if possible.

 

OPR — Oper Disconnect

Digital Operator Connection Fault. Drive commanded to run via Digital Operator (b1-02=0) but Operator is not connected.
Cause: Digital Operator not attached or connector broken.
Action: Attach the Digital Operator; check connector; verify setting of o2-06.

 

OS — Overspeed Det

Motor Overspeed. Speed feedback (U1-05) exceeded F1-08 for longer than F1-09 (F1-03=0–2, A1-02=1 or 3).
Cause: Overshooting/undershooting; reference too high; or F1-08/F1-09 settings not appropriate.
Action: Adjust ASR settings (C5 parameter group); check reference circuit and gain; verify F1-08 and F1-09.

 

OV — DC Bus Overvolt

DC Bus Overvoltage. DC bus voltage exceeded the trip point (208–240V: 410Vdc | 480V: 820Vdc).
Cause: High input voltage; deceleration time too short; or power factor correction capacitors on input or output.
Action: Check and reduce input power to within specifications; extend decel time (C1-02, C1-04, C1-06, C1-08, or C1-09); remove power factor correction capacitors.

 

PF — Input Pha Loss

Input Phase Loss. Drive input power supply has an open phase or large voltage imbalance (L8-05=1).
Cause: Open phase on input; loose terminal screws at R/L1, S/L2, or T/L3; momentary power loss; or large input voltage fluctuation.
Action: Check input voltage; tighten terminal screws.

 

PGO — PG Open

PG Disconnection (Software Detection). No PG pulses received for longer than F1-14 (F1-02=0–2, A1-02=1 or 3).
Cause: Broken PG wiring; incorrect PG wiring; no power supplied to PG; or brake is engaged.
Action: Fix broken or disconnected wiring; supply power to PG; check for open circuit when using brake.

 

PGOH — PG Open HARDWARE

PG Disconnection (Hardware Detection). No PG pulses received (F1-25=1 and/or F1-26=1, A1-02=1 or 3).
Cause: Broken PG wiring; incorrect PG wiring; or no power supplied to PG.
Action: Fix wiring; supply proper power to PG encoder; check for open circuit when using brake.

 

PUF — DC Bus Fuse Open

DC Bus Fuse Open. WARNING: Never run the Drive after replacing the fuse without first checking for shorted components.
Cause: Shorted output transistor(s) or terminals.
Action: Remove power; disconnect motor; perform checks per Table 6.6; replace shorted components; replace defective fuse.

 

RH — DynBrk Resistor

Dynamic Braking Resistor protection activated (L8-01=1). Applies only to the 3% duty cycle resistor mounted on the Drive heatsink.
Cause: Overhauling load; extended dynamic braking duty cycle; or defective dynamic braking resistor.
Action: Verify braking duty cycle; monitor DC bus voltage; replace dynamic braking resistor.

 

RR — DynBrk Transistr

Dynamic Braking Transistor Fault. Built-in dynamic braking transistor not operating properly.
Cause: High DC bus voltage triggered transistor; or defective dynamic braking resistor.
Action: Cycle power; replace defective transistor or resistor; monitor DC bus voltage.

 

SER — Search Retry Err

Exceeded allowable number of speed search retries (more than b3-19 allows).
Cause: Inappropriate settings in b3-17 and b3-18.
Action: Verify that settings in b3-17 and b3-18 are appropriate.

 

SVE — Zero Servo Fault

Zero Servo Fault. Motor position moved more than 10,000 revolutions during zero servo operation.
Cause: Torque limit too small; load torque too large; or control circuit fault (signal noise).
Action: Increase torque limit; reduce load torque; check for signal noise.

 

UL3 — Undertorq Det 1

Undertorque Detection 1. Output current < L6-02 for longer than L6-03 (L6-01=7 or 8).
Cause: Motor was underloaded.
Action: Verify L6-02 and L6-03 settings; check application/machine status to eliminate fault.

 

UL4 — Undertorq Det 2

Undertorque Detection 2. Output current < L6-05 for longer than L6-06 (L6-04=7 or 8).
Cause: Motor was underloaded.
Action: Verify L6-05 and L6-06 settings; check application/machine status to eliminate fault.

 

UV1 — DC Bus Undervolt

DC Bus Undervoltage. DC bus voltage below trip point (208–240V: ≤190Vdc | 480V: ≤380Vdc, adjustable in L2-05).
Cause: Low input voltage at R/L1, S/L2, and T/L3; acceleration time too short; or large input voltage fluctuation.
Action: Check input circuit; increase power to within specifications; extend accel time (C1-01, C1-03, C1-05, or C1-07); check input voltage.

 

UV2 — CTL PS Undervolt

Control Power Supply Undervoltage. Undervoltage of the control circuit while running.
Cause: External load pulling down Drive power supplies, or internal short in power/gate Drive board.
Action: Remove all control wiring and test Drive; cycle power; repair or replace Power PCB/Gate Drive PCB.

 

UV3 — MC Answerback

Soft Charge Circuit Fault. Pre-charge contactor opened while Drive was running.
Cause: Dirty contacts on soft charge contactor, or contactor does not function mechanically.
Action: Cycle power; check soft charge contactor condition; repair or replace Power PCB/Gate Drive PCB.
 
 

Alarm Codes — Table 6.2

 

AEr — SI-T Address Err

SI-T Station Number Setting Error. Station number of SI-T option board outside the setting range.
Cause: Station number setting error; or SI-T circuit is faulty.
Action: Check station number setting; check communications evices and signals; refer to SI-T manual.

 

BUS — Option Com Err

Option Communication Error. After initial communication was established, the connection was lost.
Cause: Connection broken; or master controller stopped communicating.
Action: Check all connections; verify all user-side software configurations.

 

CALL — SI-F/G ComCall

Serial communication transmission error. Communication has not yet been established.
Cause: Connection not made properly; or software not configured to the proper baud rate.
Action: Check all connections; verify all user-side software configurations.

 

CE — MEMOBUS Com Err

Modbus Communications Error (H5-05=1, H5-04=3). Normal communication not possible for 2+ seconds after control data received.
Cause: Communication failure after control data received.
Action: Check communications devices and signals.

 

CyC — SI-T Cycle Err

SI-T Communications Cycle Setting Error. Communications cycle of SI-T option board out of range.
Cause: Communications cycle set in the master controller was out of range.
Action: Check the SI-T communications cycle set in the master controller; refer to SI-T manual.

 

DEV — Speed Deviation

Excessive Speed Deviation (F1-04=3, A1-02=1 or 3). Speed deviation greater than F1-10 for longer than F1-11.
Cause: Load locked; accel/decel too short; load too large; or F1-10/F1-11 settings not appropriate.
Action: Reduce load; lengthen accel/decel times; check mechanical system; verify F1-10 and F1-11.

 

DNE — Drive not Enable

Drive Not Enabled. A multi-function digital input (H1-01–H1-06) is programmed for 6A: Drive Enable but the enable command is missing.
Cause: Enable command lost while Drive was running; or run command applied before the enable signal.
Action: Check the input terminal programmed for enable command; apply and maintain enable signal before applying run command.

 

EF — External Fault

Both forward and reverse run commands input simultaneously for 500ms or more. This alarm stops the motor.
Cause: External forward and reverse commands input at the same time.
Action: Check external sequence logic so only one direction input is received at a time.

 

EF0 — Opt External Flt

Communication Option Card External Fault.
Cause: External fault condition is present.
Action: Check for an external condition; verify parameters; verify communication signal.

 

EF3–EF8 — Ext Fault S3–S8

External Fault at Terminals S3–S8. Terminals programmed for external fault (alarm only — Drive continues running).
Cause: External fault condition on a multi-function digital input.
Action: Eliminate the cause of the external fault condition.

 

E5 — SI-T WDT Err

SI-T Watchdog Error. Run command or frequency reference set from option board with continuous operation set for E5 selection.
Cause: Synchronization error between master controller and Drive for control data.
Action: Check communications timing (cycle, etc.); refer to SI-T manual.

 

E-15 — SI-F/G Com Err

SI-F/G Communications Error. Run command or frequency reference set from SI-F/G Option Card and communication is lost.
Cause: Communication lost to SI-F/G option card (b1-01=3 and/or b1-02=3).
Action: Check communication signals; verify b1-01, b1-02, and F6-01; check host communication configuration.

 

FAN — Cooling FAN Err

Drive Cooling Fan Fault. Detected when L8-32=0.
Cause: Drive cooling fan has stopped.
Action: Replace the cooling fan.

 

FBL — Feedback Loss

PID Feedback Loss. Detected when b5-12=1 and PID feedback is below b5-13 for time b5-14.
Cause: PID feedback source not installed correctly or not working.
Action: Verify Drive is programmed to receive the PID feedback signal; confirm feedback source is installed and working properly.

 

OH — Heatsnk Overtemp

Cooling Fin Overheat. Drive heatsink temperature exceeded the temperature set in L8-02 (L8-03=3).
Cause: Cooling fans not working; high ambient temperature; heat source nearby; or dirty heatsink.
Action: Check for dirt build-up on fans and cooling fins; reduce ambient temperature; remove heating unit.

 

OH2 — Over Heat 2

Drive overheat alarm from multi-function digital input terminal S3–S8 programmed for B: Overheat Alarm.
Cause: External overheat condition connected to one of the multi-function input terminals.
Action: Check for external condition; verify parameters H1-01 through H1-06.

 

OH3 — Motor Overheat 1

Motor Overheating Alarm. A2 or A3 programmed for motor temperature (H3-09 or H3-05=E), exceeds 1.17V for time L1-05, and L1-03=3.
Cause: Motor overheating as measured by motor thermistor.
Action: Recheck cycle time, load, accel/decel times (C1-01/C1-02), V/F pattern (E1-01–E1-13), and motor rated current (E2-01).

 

OL3 — Overtorque Det 1

Overtorque Detection 1. Output current > L6-02 for longer than L6-03 (L6-01=1 or 2).
Cause: Motor was overloaded.
Action: Verify L6-02 and L6-03 settings; check application/machine status.

 

OL4 — Overtorque Det 2

Overtorque Detection 2. Output current > L6-05 for longer than L6-06 (L6-04=1 or 2).
Cause: Motor was overloaded.
Action: Verify L6-05 and L6-06 settings; check application/machine status.

 

OS — Overspeed Det

Overspeed. Speed feedback (U1-05) exceeded F1-08 for longer than F1-09 (A1-02=1 or 3, F1-03=3).
Cause: Overshooting/undershooting; reference too high; or F1-08/F1-09 settings not appropriate.
Action: Adjust ASR settings (C5 parameter group); check reference circuit and gain; verify F1-08 and F1-09.

 

OV — DC Bus Overvolt

DC Bus Overvoltage (Drive stopped). DC bus voltage exceeded the trip point (208–240V: 410Vdc | 480V: 820Vdc).
Cause: High input voltage; decel time too short; or power factor correction capacitors on input/output.
Action: Check and reduce input power to within specifications; extend decel time; remove power factor correction capacitors.

 

PGO — PG Open

PG Disconnection — Software. No PG pulses received for longer than F1-14 (F1-02=3, A1-02=1 or 3).
Cause: Broken PG wiring; incorrect PG wiring; no power to PG; or brake may be engaged.
Action: Fix broken or disconnected wiring; supply power to PG; check for open circuit when using brake.

 

PGO H — PG Open Hardware

PG Disconnection — Hardware. No PG pulses received (F1-25=1 and/or F1-26=1, A1-02=1 or 3).
Cause: Broken PG wiring; incorrect PG wiring; no power to PG; or brake may be engaged.
Action: Fix wiring; supply proper power to PG encoder; check for open circuit when using brake.

 

UL3 — Undertorq Det 1

Undertorque Detection 1. Output current < L6-02 for longer than L6-03 (L6-01=5 or 6).
Cause: Motor was underloaded.
Action: Verify L6-02 and L6-03 settings; check application/machine status.

 

UL4 — Undertorq Det 2

Undertorque Detection 2. Output current < L6-05 for longer than L6-06 (L6-04=5 or 6).
Cause: Motor was underloaded.
Action: Verify L6-05 and L6-06 settings; check application/machine status.

 

UV — DC Bus Undervolt

DC Bus Undervoltage (Drive stopped). DC bus voltage at or below L2-05 (208–240V: 190Vdc | 480V: 380Vdc).
Cause: Low input voltage; accel time too short; or large input voltage fluctuation.
Action: Check input circuit; increase power to within specifications; extend accel time; check input voltage.

 

UV2 — CTL PS Undervolt

Control Power Supply Undervoltage. Undervoltage of the control circuit while running.
Cause: External load pulling down Drive power supplies; or internal short in power/gate Drive board.
Action: Cycle power; repair or replace Power PCB/Gate Drive PCB; remove all control wiring and test Drive.

 

UV3 — MC Answerback

Soft Charge Circuit Fault. Pre-charge contactor opened while Drive was running.
Cause: Dirty contacts on soft charge contactor; or contactor does not function mechanically
Action: Cycle power; check soft charge contactor condition; repair or replace Power PCB/Gate Drive PCB. 

Auto-Tuning Faults — Table 6.4

Er-01 — Motor Data Fault

Error in Auto-Tuning data; motor output vs. rated current mismatch; or no-load current setting error.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check Auto-Tuning input data (T1 parameters); verify Drive and motor capacity compatibility; check E2-03 and T1-04.

 

Er-02 — Minor Fault

Alarm detected during Auto-Tuning.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check T1 parameters; check output/motor wiring; check the load.

 

Er-03 — STOP Key

STOP key pressed during Auto-Tuning; operation interrupted.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Auto-Tuning was stopped by user. Restart when ready.

 

Er-04 — Resistance

Line-to-line resistance fault during Auto-Tuning.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check Auto-Tuning input data (T1 parameters); check motor wiring.

 

Er-05 — No-Load Current

Auto-Tuning not completed within the specified time; or result outside parameter setting range.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check T1 parameters; if motor and machine are connected, disconnect motor from machine.

 

Er-08 — Rated Slip

Rated Slip Fault. Auto-Tuning not completed in time; or result outside setting range.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: If T1-03 is higher than Drive input voltage, change the input voltage setting.

 

Er-09 — Accelerate

Acceleration Fault. Motor did not accelerate within the specified time (C1-01 + 10 sec). Rotational Auto-Tuning only.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Increase C1-01; increase L7-01 and L7-02 if low; disconnect motor from load if connected.

 

Er-11 — Motor Speed

Motor Speed Fault. Torque reference exceeded 100% during acceleration (A1-02=2 or 3). Rotational Auto-Tuning only.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Increase C1-01; check F1-01 (PG pulses) and E2-04 (motor poles); disconnect motor from load if connected.

 

Er-12 — I-det. Circuit

Current Detection Fault. Current exceeded motor rated current; or open-phase on U/T1, V/T2, or W/T3.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Ensure motor is unloaded (uncoupled, brake released); check Drive wiring and mounting; check motor connections for continuity.

 

Er-13 — Leakage Inductance

Leakage Inductance Fault. Auto-Tuning did not finish in set time; or result outside parameter setting range.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check T1 parameters; check motor wiring for proper connection configuration.

 

End-1 — V/F Over Setting

V/F Settings Alarm. Torque reference > 100% and no-load current > 70% during Auto-Tuning. Displayed after completion.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check and correct motor settings (T1 parameters); disconnect motor from load if coupled.

 

End-2 — Saturation

Motor Core Saturation Fault. Iron-core saturation coefficients (E2-07, E2-08) exceeded setting range. Rotational Auto-Tuning only. Temp values set: E2-07=0.75, E2-08=0.50.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check T1 parameters; check motor wiring; disconnect motor from load if connected.

 

End-3 — Rated FLA Alm

Rated Current Setting Alarm. Measured motor rated current (E2-01) was greater than the set value. Displayed after completion.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check the motor rated current value (E2-01).

 

End-4 — Slip Lower Limit

Adjusted slip value fell below the lower limit (0.2 Hz) during stationary Auto-Tuning.
Cause: Auto-Tuning did not complete or detected an error condition.
Action: Check input data; perform Rotational Auto-Tuning if possible; otherwise perform Stationary Auto-Tuning 2.

  

Need Help With Your Yaskawa F7 Drive?

If you're seeing one of the fault codes above and aren't sure of the next step — or if you've worked through the corrective actions and the drive still isn't running right — the team at Precision Electronic Services is here to help.

We've been repairing Yaskawa drives, including the F7 series, since 1985. Our factory-trained technicians have the experience and equipment to diagnose your drive quickly and get it back in service. All repaired drives are load tested before they leave our shop.

Call us at 800-732-4695 or visit pesquality.com to send your unit in for evaluation.

Precision Electronic Services | 332 Ringgold Industrial Parkway, Danville, VA 24540

Toll Free: 800-732-4695 | Tel: 434-792-5669 | service@pesquality.com

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