Hitachi WJ200 Error Codes

E01: Over-current event while at constant speed

What it means: Output current went above the trip level while the motor ran at a steady speed, so the drive turned its output off. Hitachi names an output short circuit, a locked motor shaft or a heavy load as the usual causes.^[1][3]

Also on: SJ700-2 manual NT204DX: E01 overcurrent protection during constant speed, same meaning (SJ700-2 trips at about 220% of rated output current).

Likely causes

• Sudden load increase or a jam while running
• Short circuit in the output wiring or the motor
• Ground fault in the motor cable or motor
• Dual-voltage motor wired for the wrong voltage

First checks, in this order

1. Look for a jam, binding or a sudden load swing on the driven machine.
2. After the 10 minute wait, check the output cables and motor for shorts and ground faults.
3. Confirm the motor connection matches the supply voltage.
4. Open d081 to read the output current and frequency at the moment of the trip.

E02: Over-current event during deceleration

What it means: Output current went over the trip level while the drive was slowing the motor down.^[1][3]

Also on: SJ700-2 manual NT204DX: E02 overcurrent protection during deceleration, same meaning.

Likely causes

• Deceleration time too short for the load inertia
• Short circuit or ground fault on the output side

First checks, in this order

1. Increase the deceleration time (F003 or A093; F203 or A293 for the 2nd motor).
2. Check the output cables and motor for shorts and ground faults.

E03: Over-current event during acceleration

What it means: Output current went over the trip level while the drive was speeding the motor up. This is the overcurrent trip Hitachi covers in most detail in the WJ200 troubleshooting tips.^[1][3]

Also on: SJ700-2 manual NT204DX: E03 overcurrent protection during acceleration, same meaning.

Likely causes

• Acceleration time too short
• Excess load or a locked motor
• Overload restriction (b021) off, or its level set too high
• Torque boost or V/f pattern not matched to the load

First checks, in this order

1. Increase the acceleration time (F002 or A092; F202 or A292 for the 2nd motor).
2. Enable acceleration hold (A069, A070) or over-current suppression (b027 = 01).
3. Enable overload restriction (b021 = 01, 02 or 03). If it is already on, lower the level (b022, b025) or lengthen its deceleration rate (b023, b026).
4. Check torque boost (A041, A042) or try free V/f (A044 = 02).
5. Check the motor and machine for a locked rotor, and the wiring for shorts.

E04: Over-current event during other conditions

What it means: Output current went over the trip level while the drive was not accelerating, decelerating or running at constant speed, for example during DC braking.^[1][3]

Also on: SJ700-2 manual NT204DX: E04 overcurrent protection in other conditions, same meaning; the SJ700-2 manual points to DC braking force and the CT.

Likely causes

• DC braking force too high
• Short circuit or ground fault on the output
• Faulty current detector (CT) inside the drive

First checks, in this order

1. Lower the DC braking force (A054 for deceleration, A057 at start).
2. Check the output cables and motor for shorts and ground faults.
3. If it repeats with good wiring and a healthy motor, have the drive serviced.

E05: Overload protection

What it means: The electronic thermal function calculated a motor overload and tripped the drive. On firmware Ver.3.0 or later with b910 set to 01, 02 or 03, Hitachi calls E05 Motor Electronic Thermal Protection and moves inverter overload to E38.^[1][3]

Also on: SJ700-2 manual NT204DX: E05 Overload protection, same meaning.

Likely causes

• Motor load too high for too long
• Electronic thermal level (b012) or curve (b013) not set for the motor
• Long running at low speed with a self-cooled motor
• Wrong base frequency, AVR voltage, V/f or motor constants

First checks, in this order

1. Check the motor load and duty cycle.
2. Set b012 to the motor nameplate full load current and pick the curve in b013 (00 reduced torque, 01 constant torque, 02 free setting).
3. Watch d104 (electronic thermal monitor) while running; C061 sets an early warning level (default 90%).
4. Reset is not accepted for 10 seconds after this trip.

E07: Over-voltage protection

What it means: The DC bus voltage went above its threshold, usually because the motor fed regenerative energy back into the drive while slowing down.^[1][3]

Also on: SJ700-2 manual NT204DX: E07 Overvoltage protection, same meaning (trips at about 400 V DC on 200 V class and 800 V DC on 400 V class).

Likely causes

• Deceleration time too short
• High inertia or overhauling load driving the motor
• Deceleration overvoltage suppression (b130) off or set too high
• High supply voltage
• Ground fault on the output (named in the SJ700-2 manual)

First checks, in this order

1. Increase the deceleration time (F003 or A093; F203 or A293 for the 2nd motor).
2. Enable deceleration overvoltage suppression (b130 = 01 or 02). If it trips anyway, lower the level in b131 (keep it above input voltage x 1.41 x 1.1) and check the gains b133 and b134.
3. If the load regenerates a lot, fit a braking resistor and enable the braking circuit (b095).
4. Check the supply voltage and the output wiring for a ground fault.

E09: Under-voltage error

What it means: The internal DC bus voltage fell below a threshold, so the control circuit cannot work properly and the drive tripped. Low voltage can also cause motor heating or low torque.^[1][3]

Also on: SJ700-2 manual NT204DX: E09 Undervoltage protection, same meaning.

Likely causes

• Supply voltage dip or short power loss
• Supply capacity too small for the load
• Loose supply terminals or worn breaker or contactor contacts
• Blown input fuse or a missing phase

First checks, in this order

1. Measure the supply voltage at the input terminals with the motor loaded.
2. Check the breaker, contactor and terminal connections.
3. Check that the power source capacity is large enough.
4. To ride through short dips, set b001 (restart mode), b002 (allowed power failure time), b003 (wait time) and b004 (alarm enable).

E38: Low-speed overload protection

What it means: Overload was detected while the motor ran at a very low speed, so the drive tripped. On firmware Ver.3.0 or later with b910 set to 01, 02 or 03, Hitachi calls E38 Inverter Electronic Thermal Protection and it covers inverter overload at low and normal speed.^[1][3]

Also on: SJ700-2 manual NT204DX: E38 Low-speed overload protection, same meaning (SJ700-2 detects it at 0.2 Hz or less).

Likely causes

• Heavy load at or near zero speed, for example holding a load or breaking a stuck machine loose
• Long running at very low frequency
• Mechanical binding

First checks, in this order

1. Check the machine for binding and the load at low speed.
2. Review the torque boost and V/f settings for low speed operation.
3. Watch d104 (electronic thermal monitor) while running.
4. Reset is not accepted for 10 seconds after this trip.

E21: Inverter thermal trip

What it means: A thermal sensor in the power module found the power devices too hot, so the drive tripped.^[1][3]

Also on: SJ700-2 manual NT204DX: E21 Temperature error, same meaning. The SJ700-2 shows E20 instead when a slow cooling fan comes with the overtemperature.

Likely causes

• Cooling fan stopped or worn out
• Heatsink clogged with dust
• Cabinet too hot or poorly ventilated
• Drive not mounted vertically or without the required clearance
• Continuous load near the drive limit or a high carrier frequency

First checks, in this order

1. Check that the cooling fan runs; b092 sets when it runs.
2. Clean the heatsink and the air path.
3. Check cabinet temperature and the mounting clearances in the manual.
4. Check the load current against the drive rating and lower the carrier frequency (b083) if needed.
5. C064 sets a heatsink overheat warning level (default 100 °C).

E06: Braking resistor overload protection

What it means: Use of the braking circuit (BRD) went above the ratio set in b090, so the drive tripped to protect the braking resistor.^[1][3]

Also on: SJ700-2 manual NT204DX: E06 Braking resistor overload protection, same meaning.

Likely causes

• Deceleration too fast for the resistor
• Braking cycle repeated too often
• b090 set too low for the application
• Resistor too small for the braking energy

First checks, in this order

1. Increase the deceleration time.
2. Lengthen the operating cycle.
3. Check b090 against the resistor's allowed duty, and never set it above what the resistor can take.
4. Watch d103 (BRD load ratio monitor) and check b095 (BRD enable) and b096 (BRD activation level).

E14: Ground fault

What it means: At power up the drive tests for a ground fault between its output and the motor and trips if it finds one. Hitachi notes this protects the drive, not people.^[1][3]

Also on: SJ700-2 manual NT204DX: E14 Ground-fault protection, same meaning.

Likely causes

• Damaged motor cable insulation
• Motor winding insulation failure
• Moisture in the motor or terminal box
• Fault in the drive output stage

First checks, in this order

1. After the 10 minute wait, disconnect the motor cable from U/T1, V/T2 and W/T3 and test the motor and cable insulation.
2. Never connect an insulation tester to the drive control terminals.
3. Clear it by switching the power off and on; STOP/RESET and the RS input do not clear E14.
4. If it still trips with the motor cable removed, the drive needs repair.

E12: External trip

What it means: An intelligent input set to EXT (option code 12) turned on, so the drive tripped. What it means depends on the device wired to that input.^[1][3]

Also on: SJ700-2 manual NT204DX: E12 External trip, same meaning.

Likely causes

• An external device (for example a thermal relay, pressure switch or interlock) signaled a fault
• Wiring fault or wrong signal logic on the EXT input

First checks, in this order

1. Find the input (C001 to C007) set to 12 and the device that feeds it.
2. Clear the fault on that device.
3. The trip stays latched after EXT turns off: reset with STOP/RESET or the RS input.
4. Check the input states in d005.

E13: USP

What it means: Unattended Start Protection (USP, input option code 13) is on and the drive powered up with a Run command already active, so it tripped instead of starting.^[1][3]

Also on: SJ700-2 manual NT204DX: E13 USP error, same meaning.

Likely causes

• Run command left on while power was applied
• Power returned after an outage with the Run signal still on

First checks, in this order

1. Remove the Run command, reset, then give Run again.
2. Wait at least 3 seconds after power up before giving Run.
3. If you reset with the RS input while Run is still on, the motor starts at once.

E35: Thermistor

What it means: The motor thermistor on terminals 5 and L reads above about 3 kohm (plus or minus 10%), or its circuit is open, so the drive tripped to protect the motor.^[1][3]

Also on: SJ700-2 manual NT204DX: E35 Thermistor error, same meaning (on the SJ700-2 the thermistor goes to the TH terminal).

Likely causes

• Motor too hot
• Thermistor wire broken or loose
• Input 5 (C005) set to 19 (PTC) without a thermistor, or with 24 V DC fed to it

First checks, in this order

1. Let the motor cool and check its load and cooling.
2. Measure the thermistor and its wiring between terminal 5 and L.
3. Check C005; only input 5 accepts option 19 (PTC).
4. C085 scales the thermistor input.

E30: Driver error

What it means: An internal error occurred in the protection circuit between the CPU and the main driver unit, so the drive turned off the IGBT output. Hitachi names excessive electrical noise as a possible cause.^[1]

Likely causes

• Electrical noise from nearby equipment or poor grounding
• Internal fault in the driver circuit

First checks, in this order

1. Clear it by switching the power off and on; STOP/RESET and the RS input do not clear E30.
2. Check grounding and keep motor cables away from control wiring.
3. Check the output wiring and motor for shorts before restarting.
4. If it repeats, have the drive serviced.

E08: EEPROM error

What it means: The built-in memory had a problem from noise or high temperature, so the drive tripped.^[1][3]

Also on: SJ700-2 manual NT204DX: E08 EEPROM error, same meaning.

Likely causes

• Electrical noise
• High temperature inside the drive
• Parameters not stored correctly

First checks, in this order

1. Clear it by switching the power off and on; STOP/RESET and the RS input do not clear E08.
2. Check all parameter settings again after this error.
3. If E08 returns at power up, initialize the drive (b084, then b180 = 01) and set the parameters again.
4. Remove noise sources and check cooling.

E15: Input over-voltage

What it means: After the drive has been in Stop Mode for 100 seconds it checks the input voltage. If it is too high the drive goes into a fault state; it can run again once the fault is cleared.^[1][3]

Also on: SJ700-2 manual NT204DX: E15 Input overvoltage protection, same meaning (about 390 V DC on 200 V class, 780 V DC on 400 V class).

Likely causes

• Supply voltage above the drive rating
• Supply voltage rising when plant load drops

First checks, in this order

1. Measure the supply voltage while the drive is stopped.
2. Lower or stabilize the supply voltage.
3. Fit an AC reactor between the supply and the drive input (Hitachi advice in the SJ700-2 manual).

E10: Current detection error

What it means: The internal current detection system failed, so the drive shut off its output.^[1][3]

Also on: SJ700-2 manual NT204DX: E10 CT error, same meaning (trips when the CT outputs about 0.6 V or more at power on).

Likely causes

• Faulty current detector (CT) or its circuit inside the drive

First checks, in this order

1. Switch the power off and on and try again.
2. If it repeats, have the drive repaired.

E11: CPU error

What it means: The built-in CPU malfunctioned, so the drive tripped and turned off its output.^[1][3]

Also on: SJ700-2 manual NT204DX: E11 CPU error, same meaning.

Likely causes

• Electrical noise
• Internal CPU fault
• Bad data read from the EEPROM (named in the SJ700-2 manual)

First checks, in this order

1. Switch the power off and on (the SJ700-2 manual requires a power cycle for E11).
2. Look for noise sources near the drive.
3. If it repeats, have the drive repaired.

E22: CPU communication error

What it means: Communication between the drive's two CPUs failed, so the drive tripped.^[1]

Likely causes

• Electrical noise
• Internal fault

First checks, in this order

1. Switch the power off and on.
2. Look for noise sources and check grounding.
3. If it repeats, have the drive repaired.

E25: Main circuit error

What it means: The drive could not confirm that its power supply had come up properly, because of noise or damage to a main circuit element, so it tripped.^[1][3]

Also on: SJ700-2 manual NT204DX: E25 Main circuit error, same meaning.

Likely causes

• Electrical noise
• Damaged main circuit element (IGBT)
• Short circuit in the output circuit

First checks, in this order

1. Look for noise sources near the drive.
2. Check the output circuit for a short.
3. If it repeats, have the main circuit checked and the drive repaired.

E19: Inverter thermal detection system error

What it means: The thermal sensor in the power module is not connected, so the drive cannot watch its own temperature and trips. Hitachi added this code with firmware Ver.2.^[1]

Likely causes

• Internal sensor connection fault

First checks, in this order

1. Switch the power off and on.
2. If it returns, have the drive repaired.

E36: Braking error

What it means: Brake control is enabled (b120) and the brake confirmation signal did not arrive within b124 after the brake release signal, so the drive tripped.^[1][3]

Also on: SJ700-2 manual NT204DX: E36 Braking error, same meaning.

Likely causes

• Brake not releasing or not closing
• Brake confirmation (BOK) wiring fault
• b124 too short for a slow brake

First checks, in this order

1. Check that the brake actually opens and closes.
2. Check the BOK input (option 44 on C001 to C007) and the brake release output (BRK, option 19).
3. Increase b124 if the brake is slow.

E37: Safe Stop

What it means: A safe stop signal was given: GS1 or GS2 opened while b145 is set to 01 (trip). With b145 = 00 the drive only shuts off its output by hardware and does not trip.^[1]

Likely causes

• Emergency stop or safety relay opened GS1 or GS2 (terminals 3 and 4)
• Broken wire or loose link in the safety circuit
• Safety switch turned on with the safety circuit not wired

First checks, in this order

1. Check the safety device and the wiring to GS1 and GS2.
2. Close both inputs, then reset with the RS input or a power cycle; the keypad reset does not clear it (Ver.3.1 table).
3. Check b145.
4. Dangerous voltage remains in the drive after a safe stop.

E40: Operator connection

What it means: The connection between the drive and the external operator keypad failed, so the drive tripped (b165 set to 00 or 01).^[1]

Likely causes

• Loose or damaged keypad cable
• Keypad unplugged while running
• b165 set to trip on keypad loss

First checks, in this order

1. Check the cable and connector of the external operator.
2. Set b165 to 02 (ignore) if losing the keypad should not stop the machine.

E41: Modbus communication error

What it means: Modbus RTU communication timed out with C076 set to 00 (trip), so the drive tripped.^[1][3]

Also on: SJ700-2 manual NT204DX: E41 trip on Modbus reception timeout, set by C076, same meaning.

Likely causes

• Broken or loose RS-485 wiring
• Master stopped polling or polls slower than the timeout
• Speed, address, parity or stop bit mismatch

First checks, in this order

1. Check the wiring on SP and SN.
2. Check C071 (speed), C072 (address), C074 (parity) and C075 (stop bit) against the master.
3. Check that the master polls faster than the timeout in C077.
4. After changing C071, C074 or C075, cycle power or reset with RS.

E43: EzSQ invalid instruction

What it means: The EzSQ program in the drive memory is damaged, or the PRG input turned on with no program downloaded.^[1][3]

Also on: SJ700-2 manual NT204DX: E43 invalid instruction in easy sequence, same meaning.

Likely causes

• Program memory corrupted
• PRG input on with an empty program area

First checks, in this order

1. Check A017 (EzSQ function select) and the PRG input.
2. Download the EzSQ program to the drive again.
3. Set A017 to 00 if EzSQ is not used.

E44: EzSQ nesting count error

What it means: Subroutines, if statements or for-next loops in the EzSQ program are nested more than eight levels deep.^[1][3]

Also on: SJ700-2 manual NT204DX: E44 nesting error in easy sequence, same meaning.

Likely causes

• Program nesting deeper than eight levels

First checks, in this order

1. Rewrite the program to use eight nesting levels or fewer, then download it again.

E45: EzSQ instruction error

What it means: The drive found an EzSQ command it cannot execute.^[1][3]

Also on: SJ700-2 manual NT204DX: E45 easy sequence execution command error, same meaning.

Likely causes

• Program uses a command the drive cannot run

First checks, in this order

1. Check the program step that runs before the trip and correct it, then download it again.

E50 to E59: EzSQ user trip (0 to 9)

What it means: The EzSQ program raised a user-defined trip. The meaning of each code is set by whoever wrote the program.^[1][3]

Also on: SJ700-2 manual NT204DX: E50 to E59 easy sequence user trip 0 to 9, same meaning.

Likely causes

• Condition coded in the machine's EzSQ program

First checks, in this order

1. Ask the machine builder or read the EzSQ program to see which condition sets this trip.

E16: Instantaneous power failure protection

What it means: On the SJ700-2, a power failure of 15 ms or longer made the drive shut off its output. If a restart mode is set and the Run command is still on, it restarts when power returns.^[3]

Likely causes

• Supply dip or short outage
• Poor contacts in the breaker or magnetic contactor

First checks, in this order

1. Check the supply voltage.
2. Check the breaker and contactor contacts and replace them if worn.
3. Review the restart settings (b001 and related parameters).

E20: Temperature error due to low cooling-fan speed

What it means: On the SJ700-2, the main circuit overheated and the drive also detected that the cooling fan had slowed down.^[3]

Likely causes

• Worn or blocked cooling fan
• Clogged heatsink

First checks, in this order

1. Replace the cooling fan.
2. Clean the heatsink.

E24: Phase loss input protection

What it means: On the SJ700-2 with phase loss protection on (b006 = 01), an input phase was missing for about 1 second or more, so the drive tripped.^[3]

Likely causes

• Missing input phase
• Blown fuse
• Poor contacts in the breaker or magnetic contactor

First checks, in this order

1. Check the input power wiring and fuses.
2. Check the breaker and contactor contacts.

E23: Gate array communication error

What it means: On the SJ700-2, communication between the internal CPU and the gate array failed, so the drive tripped.^[3]

Likely causes

• Electrical noise
• Loose internal communication cable

First checks, in this order

1. Look for noise sources near the drive.
2. Check the internal connectors.
3. If it repeats, have the drive repaired.

E30: IGBT error

What it means: On the SJ700-2, E30 protects the main circuit elements: an instantaneous overcurrent, an abnormal element temperature or a drop in element drive power shut the output off. The drive cannot retry after this trip. This differs from E30 Driver error on the WJ200.^[3]

Likely causes

• Short circuit in the output
• Ground fault in the output cables or motor
• Damaged IGBT
• Clogged heatsink

First checks, in this order

1. Check the output cables and motor for shorts and ground faults.
2. Have the IGBTs checked.
3. Clean the heatsink.
4. On models 004 to 110 L/H, clear it by switching the power off and on.

E37: Emergency stop

What it means: On the SJ700-2 with the emergency stop function on (slide switch SW1 ON), the EMR signal on terminal 3 opened and the hardware shut the output off. An unconnected or broken terminal 3 also causes it. This differs from E37 Safe Stop on the WJ200.^[3]

Likely causes

• Emergency stop circuit opened
• Terminal 3 wire disconnected or wrong signal logic
• Electrical noise

First checks, in this order

1. Check the external emergency stop equipment and the terminal 3 wiring.
2. Reset only with the RS signal on terminal 1; the digital operator cannot clear it.
3. Look for noise sources near the drive.

E60 to E69: Option 1 error

What it means: On the SJ700-2, the option board in option port 1 reported an error. With the SJ-FB feedback board, E60 is encoder disconnection, E61 excessive speed, E62 positioning error, E63 position control range trip and E69 SJ-FB connection error. This differs from E60 to E69 on the WJ200.^[3]

Likely causes

• Option board fault or poor mounting
• Encoder or network fault reported by the board

First checks, in this order

1. Check that the option board is seated correctly.
2. Check the board's DIP switch settings.
3. Look up the code in the option board manual (SJ-FB, SJ-DG or SJ-DN).

E70 to E79: Option 2 error

What it means: On the SJ700-2, the option board in option port 2 reported an error. The last digit has the same meaning as for port 1 (E60 to E69).^[3]

Likely causes

• Option board fault or poor mounting
• Encoder or network fault reported by the board

First checks, in this order

1. Check that the option board is seated correctly.
2. Look up the code in the option board manual (SJ-FB, SJ-DG or SJ-DN).

E60: Option error (DeviceNet Communications error)

What it means: During operation with DeviceNet commands, the network went bus-off or timed out, so the drive tripped according to P045 and P048.^[1]

Likely causes

• DeviceNet cable or connector fault
• Master stopped communicating
• Network power or termination problem

First checks, in this order

1. Check the DeviceNet cable, connectors and terminators.
2. Check that the master is running.
3. Check P044 (watchdog timer), P045 (action on communication error) and P048 (action on idle mode).

E61: Option error (duplicated MACID)

What it means: Two or more devices on the same DeviceNet network have the same MAC ID.^[1]

Likely causes

• Duplicate node address on the network

First checks, in this order

1. Give every device on the network its own MAC ID, then cycle power.

E62: Option error (External trip)

What it means: The DeviceNet master set the Force Fault/Trip bit (Attribute 17, Instance 1 of the Control Supervisory object), so the drive tripped.^[1]

Likely causes

• Trip command from the network master

First checks, in this order

1. Check the master's program to see why it forced the trip.

E63 to E68: Option error

What it means: The option board in the option slot reported an error.^[1]

Likely causes

• Fault on the option board or its network

First checks, in this order

1. Look up the code in the instruction manual for the mounted option board.

E69: Option error (inverter communication error)

What it means: Communication between the drive and the DeviceNet option board timed out.^[1]

Likely causes

• Option board not seated properly
• Option board fault

First checks, in this order

1. Check that the option board is seated firmly.
2. If it repeats, replace the option board.

E80: Encoder disconnection

What it means: The encoder wiring is disconnected, a connection error was found, the encoder failed, or the encoder does not have line driver output, so the drive tripped.^[1]

Likely causes

• Broken or loose encoder wiring
• Failed encoder
• Encoder type not supported

First checks, in this order

1. Check the encoder wiring and connections.
2. Check that the encoder is a supported type.
3. Check P077 (encoder disconnection timeout).

E81: Excessive speed

What it means: Motor speed rose to the maximum frequency (A004) times the over-speed detection level (P026) or higher, so the drive tripped.^[1]

Likely causes

• Overhauling load driving the motor faster than commanded
• Wrong encoder feedback or settings
• P026 set too low

First checks, in this order

1. Check the load and the braking capacity.
2. Check the encoder and its pulse settings.
3. Check A004 and P026 (default 115%).

E83: Positioning range error

What it means: In simple positioning, the current position went beyond the range set in P072 (forward) and P073 (reverse), so the drive tripped.^[1]

Likely causes

• Position target or travel outside the set range
• Wrong encoder count or direction
• Range limits set too tight

First checks, in this order

1. Check P072 and P073.
2. Check the position target and the encoder feedback (d030).

E98: States of GS1 and GS2

What it means: The two safety inputs GS1 and GS2 disagree, so the drive tripped. Shown when b145 is set to 02 (firmware Ver.3.1 or later).^[1]

Likely causes

• Only one safety channel opened
• Wiring fault or failed contact in one channel

First checks, in this order

1. Check both safety channels and their wiring.
2. Clear it only by switching the power off and on.

E99: States of GS1/GS2 and EDM

What it means: The safety inputs GS1 and GS2 disagree with the EDM (external device monitor) output, so the drive tripped. Shown when b145 is 02, 03 or 05 (firmware Ver.3.1 or later).^[1]

Likely causes

• Fault in the safety input wiring
• EDM output not matching the safety inputs

First checks, in this order

1. Check the GS1, GS2 and EDM wiring and the safety relay.
2. Clear it only by switching the power off and on.

-S--: GS1 and GS2 are both opened

What it means: Special monitor display (b145 = 02 to 06, firmware Ver.3.1 or later): both safety inputs are open and consistent with EDM, so the output is safely off. The drive does not trip.^[1]

Likely causes

• Safety circuit opened on purpose, for example an emergency stop or guard door

First checks, in this order

1. Close the safety circuit to return to normal operation.

-F01 / -F02 / -F10 / -F20: Inconsistency of signal states of GS1 and GS2

What it means: Special monitor display (b145 = 05 or 06, firmware Ver.3.1 or later): one safety input lagged the other. -F01 and -F02 mean GS1 or GS2 was late when leaving safe stop, -F10 and -F20 mean GS1 or GS2 was late when entering it. The drive does not trip.^[1]

Likely causes

• Slow or failing contact in one safety channel
• Wiring fault in one channel

First checks, in this order

1. Check the contact and wiring of the late channel.
2. Open both GS1 and GS2, then close both to return to normal operation.
3. b146 sets the allowed delay when b145 = 05.

001: Frequency upper limit (A061) > Max. Frequency (A004)

What it means: Parameter conflict: the upper frequency limit is set higher than the maximum frequency.^[1][2]

Likely causes

• A061 raised, or A004 lowered, without changing the other

First checks, in this order

1. Set A061 at or below A004.
2. Read the active warning in d090.

002: Frequency lower limit (A062) > Max. Frequency (A004)

What it means: Parameter conflict: the lower frequency limit is set higher than the maximum frequency.^[1][2]

Likely causes

• A062 set too high, or A004 lowered

First checks, in this order

1. Set A062 below A004.

005: Output Frequency setting (F001) / Multi-speed freq. 0 (A020) > Max. Frequency (A004)

What it means: Parameter conflict: the frequency command (F001 or A020) is higher than the maximum frequency.^[1][2]

Likely causes

• Frequency command set above A004

First checks, in this order

1. Lower F001 or A020, or raise A004 if the motor and machine allow it.

015: Output Frequency setting (F001) / Multi-speed freq. 0 (A020) > Frequency upper limit (A061)

What it means: Parameter conflict: the frequency command is above the upper frequency limit.^[1][2]

Likely causes

• Frequency command set above A061

First checks, in this order

1. Lower F001 or A020, or raise A061.

025: Frequency lower limit (A062) > Output Frequency setting (F001) / Multi-speed freq. 0 (A020)

What it means: Parameter conflict: the lower frequency limit is above the frequency command.^[1][2]

Likely causes

• A062 set higher than the frequency command

First checks, in this order

1. Lower A062 or raise F001 or A020.

031: Start frequency > Frequency upper limit (A061)

What it means: Parameter conflict: the start frequency (b082) is above the upper frequency limit.^[1][2]

Likely causes

• b082 set too high or A061 set too low

First checks, in this order

1. Lower b082 (range 0.10 to 9.99 Hz) or raise A061.

032: Start frequency > Frequency lower limit (A062)

What it means: Parameter conflict: the start frequency (b082) is above the lower frequency limit.^[1][2]

Likely causes

• b082 set above A062

First checks, in this order

1. Lower b082 or raise A062.

035: Start frequency > Output Frequency setting (F001) / Multi-speed freq. 0 (A020)

What it means: Parameter conflict: the start frequency (b082) is above the frequency command, so the motor would not start as expected.^[1][2]

Likely causes

• Frequency command lower than b082

First checks, in this order

1. Raise F001 or A020, or lower b082.

036: Start frequency > Multi-speed freq. 1-15 (A021-A035)

What it means: Parameter conflict: the start frequency (b082) is above one or more multi-speed settings.^[1][2]

Likely causes

• A multi-speed value in A021 to A035 below b082

First checks, in this order

1. Raise the low multi-speed value or lower b082.

037: Start frequency > Jogging frequency (A038)

What it means: Parameter conflict: the start frequency (b082) is above the jog frequency.^[1][2]

Likely causes

• A038 set below b082

First checks, in this order

1. Raise A038 or lower b082.

085: Output Frequency setting (F001) / Multi-speed freq. 0 (A020) = Jump frequency

What it means: Parameter conflict: the frequency command falls inside a jump frequency band (A063 to A068), which the drive skips.^[1][2]

Likely causes

• Frequency command set inside a jump band

First checks, in this order

1. Move F001 or A020 outside the jump bands, or change A063 to A068.

086: Multi-speed freq. 1-15 (A021-A035) = Jump frequency

What it means: Parameter conflict: a multi-speed setting falls inside a jump frequency band (A063 to A068).^[1][2]

Likely causes

• Multi-speed value set inside a jump band

First checks, in this order

1. Move the multi-speed value outside the jump bands, or change A063 to A068.

091: Free setting V/f frequency 7 > Frequency upper limit (A061)

What it means: Parameter conflict: free V/f frequency 7 (b112) is above the upper frequency limit.^[1][2]

Likely causes

• b112 set above A061 while free V/f is in use

First checks, in this order

1. Lower b112 or raise A061.

092: Free setting V/f frequency 7 > Frequency lower limit (A062)

What it means: Parameter conflict: free V/f frequency 7 (b112) is related wrongly to the lower frequency limit.^[1][2]

Likely causes

• Free V/f points not matched to A062

First checks, in this order

1. Check the free V/f points (b100 to b113) against A062.

095: Free setting V/f frequency 7 > Output Frequency setting (F001) / Multi-speed freq. 0 (A020)

What it means: Parameter conflict: free V/f frequency 7 (b112) is related wrongly to the frequency command.^[1][2]

Likely causes

• Free V/f points not matched to the frequency command

First checks, in this order

1. Check the free V/f points (b100 to b113) against F001 or A020.

201 to 295: Same conflicts for the 2nd motor parameter set

What it means: Codes 201, 202, 205, 215, 225, 231, 232, 235, 285, 291, 292 and 295 are the same checks as 001 to 095, but for the 2nd motor settings (A204 max frequency, A220 multi-speed 0, A261 upper limit, A262 lower limit).^[1][2]

Likely causes

• 2nd motor limits or frequency settings in conflict

First checks, in this order

1. Use the matching 0xx row and check the 2nd motor parameters A204, A220, A261 and A262.