Industrial drive fault-code records
Use a fault code as a controlled diagnostic entry point: define the indication, separate likely fault regions and choose the next test without unnecessary module replacement.
The VLT 2800 display blinks, shows only partial segments, restarts during power-up or remains unstable even after keypad replacement.
The compact VLT reports Alarm 13 or Warning 13 when the motor is started, during acceleration, under load or immediately at PWM output.
The drive trips with Alarm 14 during start, immediately after reset, with the motor connected, or even when the motor has been disconnected for testing.
The VLT 2800 / 2900 reports Alarm 16 on start, immediately after output enable, after motor work, after cable changes or after a prior power-stage repair.
The SIMOREG 6RA70 reports F050 during a selected optimization run, often while commissioning, after a motor change, after parameter restoration or during speed-controller / current-controller tuning work.
The drive refuses or cannot complete an optimization run because parameter write access, operating state, memory handling, commissioning sequence or setup conditions are not ready.
The 6RA70 becomes unstable, overspeeds, hunts, fails speed optimization, reports speed-feedback-related behavior, or runs differently after tachometer, encoder, motor or CUD1 work.
The 6RA70 reports F005 during enable, run-up or field build-up, or the DC motor field chain cannot be confirmed even though the armature converter electronics appear alive.
The 6RA70 reports F030 during current build-up, load application, reversing, acceleration, or after mechanical or armature-circuit disturbance.
The SIMOREG PMU or operator interface is dark, resets, shows unreliable status, or the converter cannot preserve a useful diagnostic state after power-up.
The DCS800 reports F521, cannot confirm the selected motor field, or refuses to return to service because the field acknowledgement chain is not credible.
The ACS800 reports SHORT CIRC / 2340 at enable, first PWM, acceleration, steady operation or after a repaired module is returned to service.
The ACS800 displays PPCC LINK / 5210, sometimes with a module suffix or branch clue, and the drive cannot safely continue output operation.
The SJ300 / L300P trips E07 when the internal DC bus exceeds the overvoltage threshold. The trip may appear during deceleration, stop commands, descending or overhauling loads, high incoming AC voltage, or braking resistor / braking unit duty problems.
The SJ300 / L300P trips E01 at constant speed, E02 during deceleration, E03 during acceleration, or E04 under another operating condition such as DC braking, current-transformer error or noise-induced current detection.
The SJ300 / L300P trips E09 at power-up, during a load step, after a line dip, during contactor operation, or together with keypad reset / blank display behaviour.
The SJ300 / L300P has no keypad display, intermittent resets, no readable trip history, a dead front panel after a power event, or a used keypad / motherboard replacement that does not restore operation.
The 514C powers up and the machine has an enable or speed command, but the DC motor does not build usable armature voltage or torque. In other cases the output is intermittent, one direction is weak, or the motor only reacts when setpoint and enable wiring are disturbed.
The 514C installation has no torque, weak torque, unstable speed, a field-loss suspicion, or a motor field that is supplied by a separate controller or transformer rather than the expected internal route.
A 514C installation clears semiconductor fuses, trips the upstream protective device, shows a suspected bridge fault, or fails again after fuses are replaced.
A Parker / Eurotherm 590P or 591P reports a speed-feedback alarm, encoder failure, unstable speed regulation, overspeed tendency, speed collapse under load or a mismatch between armature-voltage feedback and a tachometer or encoder signal.
A Parker / Eurotherm 590P or 591P trips on OVER I TRIP during enable, autotune, current build-up, acceleration, reversing or apparently with little real armature load.
The 590P / 591P reports FIELD FAIL, cannot establish DC motor field current, or shows field feedback missing after the field should be energised.
The DC drive reports MISSING PULSE, produces uneven armature current, or behaves as if one SCR firing channel or line-reference input is absent.
The VLT trips or warns on DC-link overvoltage when the machine slows, stops a high-inertia load, lowers a vertical load, or returns energy from the motor into the drive.
Fuji FRENIC G9/G11 drive works briefly after a module replacement, then fails again, trips on output faults, produces unbalanced output, or damages another module under load.
Older Fuji or Japanese VFD module shows input/rectifier damage while the inverter section may still test differently, creating a repair-versus-replace decision for an expensive or scarce integrated module.
Yaskawa 616G3-style driver stage removes gate pulses quickly during a module overcurrent, short-circuit, weak gate drive or abnormal collector-emitter voltage event.
MICROMASTER 430 / 440 trips on F0001 during enable, acceleration, fast stop, pump start, fan inertia change or a blocked-load event.
MICROMASTER drive trips on F0002 during ramp-down, OFF3 fast stop, fan coast-down, pump check-valve slam, regenerative load or a high-line condition.
MICROMASTER 430 / 440 trips on F0003 at power-up, after contactor pull-in, when other plant loads start, or during a weak-supply event.
PowerFlex drive reports F12 / HW Overcurrent, often at start, acceleration or during a sudden load event.
PowerFlex reports F13 ground fault, sometimes intermittently and sometimes followed by a hardware-overcurrent trip.
PowerFlex reports F5 during deceleration, fast stop, lowering load or high line condition.
PowerFlex trips on F4 at power-up, when plant loads start, or after a supply dip.
PowerFlex 750-class drive trips on a DPI port-loss fault or loses communication with HIM, TCOMM, adapter or peripheral device.
Unidrive SP or Unidrive M trips on OI.AC during enable, acceleration, load change or unstable closed-loop operation.
Unidrive trips on Over Volts during deceleration, hoist lowering, winder stop or high line condition.
Unidrive reports PS.24V, loses option/module supply, or drops control logic when external loads are connected.
Unidrive reports O.ht or O.ht1 after load operation, high ambient temperature or poor cabinet cooling.
Closed-loop Unidrive application is unstable, trips under load, hunts, overspeeds or reports feedback-related symptoms.
The Altivar drive trips on OCF at run command, during acceleration or when the load changes.
The drive reports SCF or trips instantly when the output bridge is enabled.
The Altivar drive reports OSF at power-up, while idle, during deceleration, on a regenerative load, or after braking hardware has been changed.
The Altivar drive reports USF at power-up, drops ready state, trips after a run command, or shows undervoltage when the plant supply or line contactor changes state.
The Danfoss VLT reports alarm 14, trips on start or trips when the motor cable is connected.
The VLT reports alarm 16 or trips instantly when the inverter output is enabled.
The VLT reports mains phase loss, trips at power-up, or loses ready state when plant load changes.
The VLT trips on alarm 29 during load, in high ambient temperature, or after cooling airflow has degraded.
The VLT trips on overvoltage when the machine slows down, stops a high-inertia load or lowers a regenerative load.
The drive trips on DC UNDERVOLT / 3220, may not become ready, or may trip when load or line conditions pull the DC link below the permitted level.
The drive reports LINE CONV / ff51 or points the technician toward the input/line-converter side rather than the motor output side.
The ACS510/ACS550 trips on OVERCURRENT / 2310 when a start command is issued, during acceleration, or under a sudden load condition.
The drive has a stored fault, intermittent trip history or a technician request to clear the fault without understanding the triggering condition.
The MASTERDRIVES system reports a motor-temperature warning/trip, or the temperature input behaves inconsistently after wiring, motor or board work.
A hoist, lift, crane or vertical axis does not release or hold correctly, or the drive/brake sequence causes movement, trip or mechanical shock.
The drive has line power present but the keypad stays dark, flashes briefly, clicks repeatedly or never reaches a ready state.
The drive trips on overcurrent immediately at run command, during initial acceleration or before the motor reaches speed.
The drive runs normally but trips on overvoltage when stopping, ramping down, lowering a load or decelerating a high-inertia machine.
The drive powers up but trips on ground fault, earth fault or leakage indication during enable, acceleration or when output voltage is applied.
The drive reports output phase loss, motor phase loss, unbalanced output current or no torque on one phase.
A replacement output module, IPM or IGBT pack fails during the first power-up, first run test or shortly after returning the drive to service.
The digital DC drive trips before or during armature current command, and the technician must separate real load current from a corrupted current-feedback path.
The drive reports field failure, cannot establish motor field current, or detects zero field feedback after enable.
The DC drive reports missing pulse or behaves as if one firing pulse, phase reference or thyristor bridge section is absent.
The drive cannot reconcile speed feedback with commanded operation or reports tachometer/encoder feedback alarms.
The digital drive appears dead or loses interface power, requiring separation of incoming auxiliary supply, internal low-voltage rails and display/interface electronics.
The 514C powers but provides no usable armature voltage or motor torque.
The DC motor has no torque or unsafe behavior because field current is missing, weak or incorrectly wired.
Fuses open or protective devices trip, requiring separation of external load short, bridge failure and wiring errors.
Drive trips during constant speed, deceleration, acceleration or other running state.
Drive trips after sustained load, incorrect motor data or cooling trouble.
Trip often during deceleration or regenerative load conditions.
Low-bus trip or unstable operation under input/load disturbance.
Blank keypad, intermittent reset or no fault code available.
VLT 2800 reports DC LINK UNDERVOLT or trips before the motor can be run reliably.
The drive trips on overcurrent during start, acceleration or under load.
The drive reports earth fault or trips when the output is energized.
The drive reports internal or output short-circuit and may trip immediately at run command.
The VLT 2800 display blinks, only one digit illuminates or the LCP/panel replacement does not clear the symptom.
VACON NXL stops with F1 or a high-current trip during start, acceleration or under load.
The drive trips on overvoltage, often during deceleration or unstable supply conditions.
The drive trips with earth fault or output ground leakage during run command.
The NXL keypad or control panel does not initialize and the drive cannot be evaluated through normal fault history.
Drive trips with an overvoltage fault, often during deceleration, line events or attempts to start a suspect drive.
Drive faults during line sag, power cycling, startup, or large-frame operation where DC-bus ripple or input loss must be separated from internal power-stage evidence.
Drive reports F081, communication drops intermittently, the PLC/HMI loses control, or the drive reconnects automatically after network disruption.
Drive trips on ground fault or output-related protection during start/run, especially in fan and pump installations with long motor leads.
The drive appears dead, display is absent, or control electronics do not initialize after line power is applied.
ATV71 reports SCF1 or related SCF short-circuit fault during output enable, acceleration or operation.
ATV61/ATV71 displays motor short-circuit or IGBT short-circuit fault codes, sometimes in systems powered by a generator or non-ideal source.
ATV71 shows USF or a low DC-bus condition, potentially during energization, acceleration, load operation or after a supply disturbance.
ATV61/ATV71 has a blank/off display, no keypad information, or a drive that cannot be interrogated normally from its HMI.
A suspected failed ATV71 power board must be evaluated against spare-parts availability, Field Services restrictions, repairability and replacement-drive options.
The drive has no display, unstable control logic, or cannot initialize because the internal auxiliary supply is absent or unstable.
The drive trips on energization, shows bus-related instability, damages bus components, or cannot progress through a stable DC-link condition.
The drive trips around output enable, repeats power-module failure, or shows suspected phase-leg damage after an attempted IGBT replacement.
The drive trips or blocks output with evidence pointing to protection logic, phase feedback or comparator-threshold behavior.
A replacement IGBT, power board or control board fails again after apparent repair, or the drive cannot be returned to reliable service.
Drive powers with POFF indication or board-level logic behavior suggesting supply or processor-side fault rather than a simple input-power absence.
EV2000 displays E019 and may not reset or run, even when output current should be absent.
Keypad/display is blank or the board will not initialize, with possible 5 V / 3.3 V / reference rail involvement.
EV1000 small-frame control board does not initialize the display or panel interface.
Drive display recovers after a power-stage repair but run command produces no output, E019, or unsafe post-repair behavior.
The Series 15H reports HW Power Supply, may fail to enable correctly, or may present unstable control behavior associated with its low-voltage electronics.
The drive declares HW Ground Fault during run request or output energization, requiring separation of motor/cable insulation failure from internal drive-side protection activity.
The Series 15H trips with BUS Overvoltage, often requiring separation of line conditions, deceleration regeneration and dynamic-braking or internal measurement issues.
The drive reports a low DC-bus condition or cannot maintain operation while the control electronics may still show status information.
The inverter is supplied correctly at its input but the display, control response, fan/relay readiness or low-voltage electronics are absent or unstable.
The control section appears alive and the unit may accept a command, but no usable U/V/W output is produced or an attempted start results in immediate protection.
The inverter shows current-related abnormal behaviour, protection on attempted operation, or inconsistent evidence even after external motor/cable conditions have been investigated.
A repaired LG / LS SV185iS5-4N0 shows abnormal or unstable low-voltage supplies; the nominal 24 V control rail may rise far above normal and endanger connected control electronics.
An iS5 drive initially presents with power-stage and CPU-board damage; after apparent repair and test power-up, the CPU board fails again.
Low-voltage outputs fluctuate or rise together, creating misleading control-board, keypad or hardware-fault symptoms before the drive can be evaluated normally.
The FR-A740 trips as the motor begins to accelerate or immediately after a start command.
The FR-A740 trips while stopping a rotating load or reducing speed.
The drive stops after sustained high current without an instantaneous overcurrent trip.
The A1000 trips immediately or under output demand with an SC indication.
The A1000 indicates GF during operation or immediately after a run command.
A 616G3 drive powers normally but trips on the run command, or low-energy test indications suggest a short after IGBT replacement.
The ACS800 reports PPCC LINK, commonly as code 5210, and output operation is blocked or unreliable.
The ACS800 trips on SHORT CIRC during an enable/start attempt or immediately under load.
The DCS800 reports F521 and cannot establish a valid field acknowledgement for the selected motor.
The drive reports E019 during power-up or operation, potentially without a genuine motor overcurrent event.
The keypad displays POFF immediately after power-up or only when the motor is commanded to run.
EV1000 reports E010 either immediately at energization or when a run command is issued.
The drive does not complete DC-link precharge within the monitored period and prevents normal enable.
The MASTERDRIVES unit trips as the DC-link voltage rises above the permitted limit, often under regeneration or deceleration.
The drive disables pulses because DC-link voltage is below the permissible level for operation.
The drive trips on excessive current; the OEM fault value can indicate the affected U, V or W phase in supported units.