Hyundai VFD Error Codes

E04: Overcurrent protection (N700E)

What it means: The inverter output current went above about 200% of rated current, usually with the motor locked or slowed down hard, and the protection circuit cut the output. An output short circuit can also show as E04 (or E34).^{[1][2][3][4][5]}

Also on: Inverters: N700E. N50 and N100: E04, remote operator text Over.C, same description.

Inverter response: output cut off, motor coasts; stays tripped until reset

Likely causes

• Motor shaft locked or load too heavy
• Short circuit on the inverter output (U, V, W cables or motor)
• In sensorless vector mode, overcurrent when load is applied, which Hyundai links to the motor no-load current setting H06

First checks, in this order

1. Check the driven machine for a jam; reduce the load and test the motor on its own (Hyundai troubleshooting tips).
2. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
3. In sensorless vector mode, if it trips when load is applied, raise the motor no-load current H06 slowly, up to 1.2 times the auto-tuning value.
4. Check overload restriction b06 (default 3, overload and overvoltage restriction on) and its level b07.
5. With restart mode b01 set to 1, 2 or 3, the drive retries an overcurrent trip up to 3 times before it stays tripped.
6. Before any reset, make sure the run command is off: with run on, the motor restarts as soon as the alarm clears.

E34: Output short-circuit

What it means: The inverter output was short-circuited. The excessive current made the inverter turn its output off. The N700E manual says an output short shows as E04 or E34.^{[1][2][3][4][5]}

Also on: Inverters: N700E. N50 and N100: E34, remote operator text PM.ERR (N50 and N100 list only E34 for output short-circuit).

Inverter response: output turned off

Likely causes

• Short circuit between output phases or to ground in the motor cable
• Shorted motor winding

First checks, in this order

1. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
2. Check the U, V, W terminals and cable for damage before switching on again.
3. Before any reset, make sure the run command is off: with run on, the motor restarts as soon as the alarm clears.

E14: Ground fault (N700E)

What it means: A ground (earth) fault was detected while the inverter was running, and the output was cut off.^[1][2][3]

Also on: Inverters: N700E.

Inverter response: output cut off

Likely causes

• Insulation fault to ground in the motor or the motor cable
• Ground fault detection is active only when b18 is set above 0 (level as a percent of rated current; 0 means no detection, the default)

First checks, in this order

1. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
2. Check the b18 ground fault level setting (0.0 to 100.0% of rated current).
3. Before any reset, make sure the run command is off: with run on, the motor restarts as soon as the alarm clears.

E17: Inverter Overload (N700E)

What it means: The IGBT power devices are protected from overheating. The inverter trips after about 1 minute at 150% load in Heavy Duty or 120% in Normal Duty; the time changes with carrier frequency, load, ambient temperature and power rating.^[1][2][3]

Also on: Inverters: N700E. 0.4 to 3.7 kW manual: 1 minute at 150% load.

Inverter response: output cut off

Likely causes

• Load above the inverter rating for too long
• Normal Duty (b26 = 1) selected on a heavy load: Normal Duty has a lower overload tolerance and is meant for fans and pumps
• Carrier frequency (b11) raised, or high ambient temperature

First checks, in this order

1. Compare the output current with the inverter rating; reduce the load or use a larger inverter.
2. Check b26: 0 Heavy Duty (standard), 1 Normal Duty for fans or pumps.
3. Check the carrier frequency b11 against the factory value for the model.
4. Check the ambient temperature (up to 40 degrees C at default carrier frequency per the UL notes) and the mounting clearance.

E20: Input phase loss (N700E)

What it means: A phase is missing on the AC input. The drive detects it from the fluctuation of the main circuit DC voltage; degraded main capacitors can also trigger it.^[1][2][3]

Also on: Inverters: N700E.

Inverter response: output cut off

Likely causes

• Missing input phase: blown fuse, open breaker pole or loose terminal
• Degraded main (smoothing) capacitor, which Hyundai says needs maintenance replacement

First checks, in this order

1. Measure the voltage on R, S, T and check the fuses, breaker and terminal tightness.
2. Do not run a three phase model on single phase input: Hyundai warns of fire danger.
3. If the supply is healthy, inspect the smoothing capacitor for leaks or swelling.
4. b27 sets the detection time, 0 to 30 s (default 10); 0 disables the function.

E21: Temperature trip (N700E, N300)

What it means: The main circuit (power module) temperature went above the limit, typically because the cooling fan stopped, and the output was cut off. The N700E manual applies it to models with a cooling fan.^{[1][2][3][4][5][8]}

Also on: Inverters: N700E, N300. N50 and N100: E21, remote operator text OH.FIN. N300: name Inverter thermal trip, remote text OH.FIN.

Inverter response: output cut off

Likely causes

• Cooling fan stopped
• Dust on the fan and heat sink
• High ambient temperature or too little ventilation space

First checks, in this order

1. Power down and turn the fan by hand: rotation must be smooth and quiet. Hyundai lists cooling fans as spare parts for replacement.
2. Vacuum dust off the fan and heat sink; Hyundai notes dust there causes overheating.
3. Check the ambient temperature (inspection limit -10 to 40 degrees C on the N700E) and the clearance: 10 cm or more for 5.5 to 55 kW, 30 cm for 75 to 132 kW, 50 cm for 160 to 375 kW.

E22: Safety Function, option (N700E)

What it means: The optional safety input is in the active state. The inverter can be reset after the safety operation signal is removed.^[3]

Also on: Inverters: N700E (with the safety option).

Inverter response: output off; reset after the safety signal is removed

Likely causes

• Safety operation signal active on the optional safety input

First checks, in this order

1. Find why the safety input is active and clear the safety circuit.
2. Remove the safety operation signal, then reset.

E60: Communication error

What it means: Communication error between the inverter and its operator (keypad). It also appears when the reset signal stays on for more than 4 seconds.^{[1][2][3][4][5]}

Also on: Inverters: N700E. N50 and N100: E60, remote operator text Com.ERR.

Likely causes

• Communication fault between the inverter and its operator (keypad)
• RS (reset) terminal held on at power up for more than 4 seconds
• N50 and N100: external noise or excessive temperature rise

First checks, in this order

1. Check the operator connection and its cable.
2. If the RS terminal input was on at power up for more than 4 seconds, the display shows E60 although the inverter has no error: turn RS off and press STOP/RESET.
3. On N50 and N100 also look for noise sources and check cooling.

E05: Overload protection (Electronic thermal)

What it means: The electronic thermal function detected a motor overload and the inverter tripped and turned off its output to protect the motor.^{[1][2][3][4][5][6][7][8]}

Also on: Inverters: N700E, N700, N300. N50 and N100: E05, remote operator text Over.L. N700: text OL.MOT. N300: remote text Over.L.

Inverter response: output cut off; N700 and N300 restart with reset after 10 seconds

Likely causes

• Motor load too heavy for too long
• Electronic thermal level set below the motor rated current (N700E b04, N700 b027)
• Thermal characteristic not matched to the motor cooling (N700E b05, N700 b028)

First checks, in this order

1. Check the motor current against the nameplate and reduce the load if it is too high.
2. Set the electronic thermal level to the motor rated current: N700E b04 (20% to 120% of motor rated current, default 100%), N700 b027.
3. N700E b05: 0 when the fan is on the motor shaft (self-cool), 1 when the fan has its own supply (forced-cool).
4. N700 and N300: after the trip, wait 10 seconds, then reset to restart.

E06: Braking resistor overload protection

What it means: The regenerative braking circuit (BRD) went over its allowed usage ratio, so the overvoltage circuit activated and the inverter switched its output off.^{[1][3][6][7][8]}

Also on: Inverters: N700E, N700, N300. N700: text OL.DBR. N300: remote text OL.BRD. The N700E 0.4 to 3.7 kW manual table does not list E06.

Inverter response: output switched off

Likely causes

• Braking duty above the set BRD usage ratio (N700E b33, default 10.0%; N700 C021)
• Frequent or hard stopping of a load that feeds energy back
• N700 and N300: overvoltage after the BRD function stopped

First checks, in this order

1. Check the BRD usage ratio against the resistor rating: N700E b33 (0.0 to 50.0%), N700 C021.
2. Check the braking resistor: it must be rated to limit the current through the BRD. Inspect it for cracks or discoloring and check it with an ohm meter.
3. Inverters rated above 30 kW have no built-in BRD: they need the optional external braking unit with its resistor.
4. If it trips while stopping, Hyundai's N700 manual advises a longer deceleration time.

E07: Over voltage protection

What it means: The DC link (DC bus) voltage went above the limit, from regenerative energy of the motor or a high supply voltage, and the inverter cut its output.^{[1][2][3][4][5][6][7][8]}

Also on: Inverters: N700E, N700, N300. N50 and N100: E07, remote operator text Over.V. N700: text OV.DC. N300: remote text Over.V.

Inverter response: output cut off

Likely causes

• Regenerative energy from the motor, for example when stopping a high inertia load
• Main power supply voltage too high

First checks, in this order

1. Measure the supply voltage on R, S, T: N700E rating is 200 to 240 V or 380 to 480 V three phase.
2. Check that overvoltage restriction is on: N700E b06 = 2 or 3 (default 3).
3. If it trips during deceleration, lengthen the deceleration time (Hyundai N700 manual note) and use a braking resistor or external braking unit if the load regenerates.
4. N700E restart mode b01 retries overvoltage trips up to 3 times.

E08: EEPROM error

What it means: The internal EEPROM (parameter memory) has an error, so the inverter cut its output.^{[1][2][3][4][5][8]}

Also on: Inverters: N700E, N300. N50 and N100: E08, remote operator text EEPROM. N300: remote text EEPROM.

Inverter response: output cut off

Likely causes

• External electrical noise
• Excessive temperature rise
• Other internal factor

First checks, in this order

1. After the reset, check all parameter settings: Hyundai warns the setting data or alarm signal may be wrong after this error.
2. Look for strong noise sources near the inverter and its control wiring.
3. Check cooling and the ambient temperature around the inverter.

E09: Under-voltage protection

What it means: The input voltage, seen on the internal DC bus, dropped below the low voltage detection level, so the control circuit cannot work normally and the output is cut. The N700E catalog gives about 150 to 160 V for the 200 V class and 300 to 320 V for the 400 V class. Low voltage can also cause motor heating or low torque.^{[1][2][3][4][5][6][7][8]}

Also on: Inverters: N700E, N700, N300. N50 and N100: E09, remote operator text Under.V. N700: text UV.DC. N300: remote text Under.V.

Inverter response: output cut off; can auto restart if restart mode is set

Likely causes

• Low supply voltage
• Momentary power interruption or dip
• Blown fuse or open supply

First checks, in this order

1. Measure the supply voltage on R, S, T while running and check that all phases are balanced.
2. Check the fuses and the supply breaker.
3. N700E: b01 restart mode retries undervoltage up to 10 times; b02 sets the allowable momentary power failure time (0.3 to 1.0 s) and b03 the restart delay.
4. N700E b24 chooses whether the alarm relay operates on an undervoltage trip.
5. With USP enabled, the drive will not restart by itself after an E09 reset while the run command is on.

E11: CPU error

What it means: The inverter main CPU reported an error.^[3][8]

Also on: Inverters: N700E, N300. N300: remote operator text CPU1. Listed in the 2018 N700E catalog, not in the N700E manuals.

Inverter response: power off, discharge completely, power on

Likely causes

• Malfunction of the built-in CPU

First checks, in this order

1. Switch the input power off, wait until the inverter has discharged completely (charge lamp off), then switch it on again.
2. If it repeats, contact your local Hyundai branch with the inverter model, serial number, purchase date and the fault.

E12: External trip

What it means: An input terminal set to EXT turned on, so the inverter latched a trip and stopped its output. What it means depends on the device wired to EXT.^{[1][2][3][4][5][6][7][8]}

Also on: Inverters: N700E, N700, N300. N50 and N100: E12, remote operator text EXTERNAL. N700: text EXT.ERR. N300: remote text EXTERNAL.

Inverter response: trip latched until reset or power cycle

Likely causes

• The external device wired to the EXT input reported a fault
• EXT assigned to the wrong input terminal

First checks, in this order

1. Find which input is set to EXT (N700E: C01 to C06 = 10; N700: input setting 12) and which device drives it.
2. Fix the fault on that external device.
3. Turning EXT off does not clear the trip: reset with STOP/RESET, the RS terminal, or by switching power off and on.
4. With USP in use, give a fresh run command (off to on) after the reset.

E13: USP error

What it means: Unattended Start Protection tripped: the run command was already on when power came on (USP function enabled), so the inverter did not start.^{[1][2][3][4][5][6][7][8]}

Also on: Inverters: N700E, N700, N300. N50 and N100: E13, remote operator text USP. N700: text USP.ERR. N300: remote text USP.

Inverter response: no start until run command is cycled or reset

Likely causes

• Run command left on while power was restored
• Run command given too soon after power up (N700E: wait at least 3 seconds)

First checks, in this order

1. Turn the run command off, or reset with STOP/RESET or the RS terminal.
2. Danger: if you reset while the run command is still on, the inverter restarts at once.
3. N700E: wait at least 3 seconds after power up before giving the run command.

E01: Over-current protection (at constant speed)

What it means: Excessive output current while running at constant speed, so the current protection circuit stopped the output.^[6][7][8]

Also on: Inverters: N700, N300. N700: text OC.CON. N300: remote operator text OC.Drive.

Inverter response: output stopped

Likely causes

• Motor shaft locked or a heavy load step while running
• Short circuit on the inverter output

First checks, in this order

1. Check the driven machine for jams or load surges.
2. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
3. N700: read trip monitor d019 (trip code, output frequency, output current and DC voltage at the trip).

E04: Over-current protection, others (N700, N300)

What it means: Excessive output current in an operating state other than constant speed, acceleration or deceleration.^[6][7][8]

Also on: Inverters: N700, N300. N700: text OC.ETC. N300: remote operator text Over.C. On the N700E, E04 means any overcurrent (see that row).

Inverter response: output stopped

Likely causes

• Motor shaft locked or heavy load
• Short circuit on the inverter output

First checks, in this order

1. Read the trip monitor to see the operating state, frequency, current and DC voltage at the trip (N700 d019).
2. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.

E14: Ground fault protection (N700, N300)

What it means: At power up the inverter checks for a ground fault between its output and the motor and trips if it finds one. This protects the inverter only.^[6][7][8]

Also on: Inverters: N700, N300. N700: text GND.FLT. N300: remote operator text GND.Flt.

Inverter response: trip at power up

Likely causes

• Insulation fault to ground in the motor or the cable between inverter and motor

First checks, in this order

1. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
2. N700: b013 = 1 enables the power up check.
3. On the N700 a ground fault that happens while running stops the inverter with another error, such as overcurrent or overvoltage.

E16: Instantaneous Power Failure Protection

What it means: The supply was lost for more than 15 ms, so the inverter switched its output off. If the power stays off past the wait time, it is treated as a normal power failure.^[6][7][8]

Also on: Inverters: N700, N300. N700: text IPF.ERR (manual name Temporary power loss protection). N300: name Instantaneous power failure, remote text Inst.P-F.

Inverter response: output off; may restart when power returns

Likely causes

• Momentary loss or dip of the supply longer than 15 ms
• N700 note in the restart section: an overvoltage or overcurrent trip during deceleration can show as E016, with the inverter free-running

First checks, in this order

1. Check the supply for interruptions, loose connections and breaker trips.
2. Danger: with restart selected and the run command still on, the inverter restarts when power returns.
3. N700 retry settings: b016 retry selection, b017 allowable under-voltage power failure time (0.3 to 1.0 s), b018 retry wait time.
4. If it shows while stopping on an N700, lengthen the deceleration time.

E02: Over-current protection, on acceleration (N700)

What it means: Excessive output current during acceleration, so the current protection circuit stopped the output.^[6][7]

Also on: Inverters: N700. N700: text OC.ACC. On the N300, E02 is overcurrent during deceleration.

Inverter response: output stopped

Likely causes

• Motor shaft locked or heavy load during acceleration
• Restart at 0 Hz into a motor that is still turning fast (Hyundai notes possible overcurrent trips)
• Short circuit on the inverter output

First checks, in this order

1. Check the driven machine for jams.
2. If it trips on an automatic restart: a 0 Hz start into a fast turning motor can cause overcurrent, and with frequency matching start Hyundai advises a longer retry wait time b018.
3. Check overload restriction b030 (it can act during acceleration and constant speed) and its level b031.
4. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.

E03: Over-current protection, on deceleration (N700)

What it means: Excessive output current during deceleration, so the current protection circuit stopped the output.^[6][7]

Also on: Inverters: N700. N700: text OC.DEC. On the N300, E03 is overcurrent during acceleration.

Inverter response: output stopped

Likely causes

• Motor restricted and slowing down rapidly, so excessive current flows back to the inverter
• Short circuit on the inverter output

First checks, in this order

1. Lengthen the deceleration time (Hyundai N700 note for overcurrent or overvoltage trips while decelerating).
2. If retry is selected, increase the retry wait time b018.
3. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.

E17: Abnormal temperature (N700)

What it means: The main circuit temperature rose abnormally, for example because the cooling fan stopped, and the inverter switched its output off.^[6][7]

Also on: Inverters: N700. N700: text OT.ERR; catalog name Inverter Thermal Trip. On the N700E, E17 is inverter (IGBT) overload.

Inverter response: output switched off

Likely causes

• Cooling fan stopped
• Inverter internal (power device) temperature above the specified value

First checks, in this order

1. Check that the cooling fan runs; b011 sets whether it runs always or only during run.
2. Monitor d017 shows the IGBT module temperature and holds the trip temperature after a heatsink overheat trip until reset.
3. Clean the cooling system (air filter and so on) as in Hyundai's regular inspection.

E20: Open-phase protection, R phase (N700)

What it means: Input phase R is open, so the inverter switched its output off.^[6][7]

Also on: Inverters: N700. N700: text R PH.ERR. On the N700E, E20 is input phase loss on any phase.

Inverter response: output switched off

Likely causes

• Open R phase on the input supply

First checks, in this order

1. Measure the input voltage on R, S and T and check that the phases are balanced.
2. Check the fuse, breaker pole and terminal for the R phase.

E21: Open-phase protection, S phase (N700)

What it means: Input phase S is open, so the inverter switched its output off.^[6][7]

Also on: Inverters: N700. N700: text S PH.ERR. On the N700E, N50, N100 and N300, E21 is a temperature trip.

Inverter response: output switched off

Likely causes

• Open S phase on the input supply

First checks, in this order

1. Measure the input voltage on R, S and T and check that the phases are balanced.
2. Check the fuse, breaker pole and terminal for the S phase.

E22: Open-phase protection, T phase (N700)

What it means: Input phase T is open, so the inverter switched its output off.^[6][7]

Also on: Inverters: N700. N700: text T PH.ERR. On the N700E, E22 is the optional safety function.

Inverter response: output switched off

Likely causes

• Open T phase on the input supply

First checks, in this order

1. Measure the input voltage on R, S and T and check that the phases are balanced.
2. Check the fuse, breaker pole and terminal for the T phase.

E24: Thermistor error (N700)

What it means: The motor thermistor input showed a high resistance, meaning the motor is too hot, so the inverter switched its output off.^[6][7]

Also on: Inverters: N700. N700: text THMIS.ERR. On the N300, E24 is phase failure detection and its thermistor error is E35.

Inverter response: output switched off

Likely causes

• Motor overheating
• Thermistor wiring or settings not matching the thermistor

First checks, in this order

1. Check the motor temperature and its cooling.
2. Check the thermistor wiring between TH and CM1 (Hyundai asks for twisted wires).
3. Check b034 thermistor type (1 PTC, 2 NTC) and b035 trip resistance (0 to 9999 ohm, default 3000).

E25: Abnormal brake

What it means: With the external brake control function on, the inverter could not confirm the brake switching ON or OFF in time, so it tripped and gave the brake error signal (BER).^[6][7]

Also on: Inverters: N700. N700: text BRK.ERR; catalog name Braking Error.

Inverter response: trip, brake error output

Likely causes

• Brake confirmation signal BOK not received, or not turned off, within the waiting time C016
• Output current below the release current C018 when the brake should open

First checks, in this order

1. Check the brake and its BOK feedback on the assigned input terminal.
2. Check C016 (waiting time for brake confirmation) and C018 (release current).
3. Check that the BRK (brake release) and BER (brake error) outputs are assigned.

E26: Communication error

What it means: Communication timeout between the inverter and the operator (keypad).^[6][7]

Also on: Inverters: N700. N700: text COMM.ERR.

Likely causes

• Communication timeout between the inverter and the operator

First checks, in this order

1. Check the digital operator OPE-N7 connection and, for remote use, the ICS-1 or ICS-3 cable.

E27: Overtime of reset input

What it means: The reset signal stayed on longer than the set time of 5 seconds.^[6][7]

Also on: Inverters: N700. N700: text RESET.ERR.

Likely causes

• Reset (RS) input held on for more than 5 seconds

First checks, in this order

1. Check the RS input wiring and the device that drives it, then release the reset signal.

E28: IGBT protection (output phase U)

What it means: An instantaneous overcurrent was detected on output phase U, and the output was switched off to protect the main devices.^[6][7]

Also on: Inverters: N700. N700: text UIGBT.ERR.

Inverter response: output switched off

Likely causes

• Short circuit or ground fault on the U phase of the motor cable or winding

First checks, in this order

1. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
2. Check the U phase cable and terminal for damage.

E29: IGBT protection (output phase V)

What it means: An instantaneous overcurrent was detected on output phase V, and the output was switched off to protect the main devices.^[6][7]

Also on: Inverters: N700. N700: text VIGBT.ERR.

Inverter response: output switched off

Likely causes

• Short circuit or ground fault on the V phase of the motor cable or winding

First checks, in this order

1. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
2. Check the V phase cable and terminal for damage.

E30: IGBT protection, output phase W (N700)

What it means: An instantaneous overcurrent was detected on output phase W, and the output was switched off to protect the main devices.^[6][7]

Also on: Inverters: N700. N700: text WIGBT.ERR. On the N300, E30 is a general IGBT error.

Inverter response: output switched off

Likely causes

• Short circuit or ground fault on the W phase of the motor cable or winding

First checks, in this order

1. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.
2. Check the W phase cable and terminal for damage.

E31: Option error

What it means: An error was detected on option PCB 1 or 2.^[6][7]

Also on: Inverters: N700. N700: text OPT.ERR.

Likely causes

• Fault on a fitted option board

First checks, in this order

1. See the instruction manual of the fitted option PCB for the detailed error.

E32: Over speed error

What it means: The motor rotation speed exceeded the specified value.^[6][7]

Also on: Inverters: N700. N700: the text display shows RESVD for this code.

Likely causes

• Motor speed above the specified limit

First checks, in this order

1. Read the trip monitor (N700 d019) for the output frequency and operating state at the trip.
2. Check the motor and driven load before resetting.

E02: Over-current protection, during deceleration (N300)

What it means: Excessive output current during deceleration: the output was short-circuited, or the motor shaft is locked or heavily loaded, so the inverter turned off its output.^[8]

Also on: Inverters: N300. N300: remote operator text OC.Decel. On the N700, E02 is overcurrent on acceleration.

Inverter response: output turned off

Likely causes

• Motor shaft locked or heavy load
• Short circuit on the inverter output

First checks, in this order

1. Check the driven machine for jams.
2. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.

E03: Over-current protection, during acceleration (N300)

What it means: Excessive output current during acceleration: the output was short-circuited, or the motor shaft is locked or heavily loaded, so the inverter turned off its output.^[8]

Also on: Inverters: N300. N300: remote operator text OC.Accel. On the N700, E03 is overcurrent on deceleration.

Inverter response: output turned off

Likely causes

• Motor shaft locked or heavy load
• Short circuit on the inverter output

First checks, in this order

1. Check the driven machine for jams.
2. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.

E10: CT error

What it means: A strong source of electrical interference near the inverter, or abnormal operation of the built-in current transformer (CT), made the inverter trip.^[8]

Also on: Inverters: N300. N300: remote operator text CT.

Inverter response: output turned off

Likely causes

• Strong electrical interference close to the inverter
• Abnormal operation of the built-in CT

First checks, in this order

1. Look for strong interference sources near the inverter and its wiring.
2. If it returns after reset, contact your local Hyundai branch with model, serial number and purchase date.

E15: Input over-voltage protection

What it means: The input voltage is higher than the specified value. The check runs 60 seconds after power up, then the inverter trips and turns off its output.^[8]

Also on: Inverters: N300. N300: remote operator text OV.SRC.

Inverter response: output turned off

Likely causes

• Supply voltage above the inverter rating

First checks, in this order

1. Measure the supply voltage on R, S, T against the rating plate and correct it before resetting.

E23: Gate array error

What it means: A communication error occurred between the CPU and the gate array inside the inverter.^[8]

Also on: Inverters: N300. N300: remote operator text GA.

Likely causes

• Internal communication fault between CPU and gate array

First checks, in this order

1. Reset; if it returns, contact your local Hyundai branch with model, serial number and purchase date.

E24: Phase failure detection (N300)

What it means: One of the three lines of the 3 phase power supply is missing.^[8]

Also on: Inverters: N300. N300: remote operator text PH.Fail. On the N700, E24 is a thermistor error.

Likely causes

• Blown fuse, open breaker pole or loose terminal on one input line

First checks, in this order

1. Measure the voltage on R, S, T and check the fuses, breaker and terminals.

E30: IGBT error (N300)

What it means: An instantaneous overcurrent occurred, and the inverter tripped and turned off its output to protect the main circuit element.^[8]

Also on: Inverters: N300. N300: remote operator text IGBT. On the N700, E28, E29 and E30 name the output phase.

Inverter response: output turned off

Likely causes

• Instantaneous overcurrent, such as a short on the output

First checks, in this order

1. With power off, disconnect the motor cable from U, V, W and megger the motor and cable at DC 500 V: Hyundai asks for over 5 M ohm. Never run a withstand voltage test on the inverter itself.

E35: Thermistor error

What it means: The thermistor inside the motor detected a temperature higher than the specified value, so the inverter tripped.^[8]

Also on: Inverters: N300. N300: remote operator text TH.

Inverter response: output turned off

Likely causes

• Motor overheating
• Thermistor or its setting not matching

First checks, in this order

1. Check the motor temperature and cooling.
2. Check the thermistor wiring to TH and CM1; Hyundai recommends a thermistor of 100 mW or more with about 3 k ohm at abnormal temperature, and the protection level can be set from 0 to 9999 ohm.

E36: Braking error

What it means: With braking enabled at b120, the inverter could not detect whether the brake is ON or OFF within the waiting time set at b024 after releasing the brake, so it turned off its output.^[8]

Also on: Inverters: N300. N300: remote operator text BRAKE.

Inverter response: output turned off

Likely causes

• Brake feedback not received within the waiting time b024

First checks, in this order

1. Check the brake and its feedback signal.
2. Check the waiting time b024.

E60 to E69: Option 1 connection error

What it means: An error was detected in option 1 or at its connecting terminals.^[8]

Also on: Inverters: N300. N300: remote operator text OP1-0 to OP1-9. On the N700E, N50 and N100, E60 is an operator communication error.

Likely causes

• Fault in option board 1 or its connection

First checks, in this order

1. Check option board 1, its terminals and wiring, and see the option manual.

E70 to E79: Option 2 connection error

What it means: An error was detected in option 2 or at its connecting terminals.^[8]

Also on: Inverters: N300. N300: remote operator text OP2-0 to OP2-9.

Likely causes

• Fault in option board 2 or its connection

First checks, in this order

1. Check option board 2, its terminals and wiring, and see the option manual.

UV.WAIT: Out of operation due to under voltage

What it means: Because of insufficient voltage, the inverter has turned off its output and is trying to restart. If it fails to restart, it goes into the under-voltage error (E09).^[8]

Also on: Inverters: N300. Shown on the remote operator; the built-in digital operator shows ---.

Inverter response: output off while waiting to restart

Likely causes

• Supply voltage too low

First checks, in this order

1. Measure the supply voltage and find the cause of the dip before it becomes an E09 trip.

R-ERROR COMM <2>: Communication error

What it means: An error between the remote operator and the inverter has been detected.^[8]

Also on: Inverters: N300. Shown on the remote operator; the built-in digital operator shows ---.

Likely causes

• Remote operator cable or connection fault

First checks, in this order

1. Check the remote operator (copy unit) cable and its connection.