SEW-Eurodrive Fault Codes

F01: Overcurrent

What it means: Output current went above the inverter's limit, so the output stage switched off at once.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (as Overcurrent in output stage, status LED 3x red)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Short circuit at the inverter output, in the motor cable or in the motor
• Output contactor switched while the output stage was active
• Motor too large for the inverter
• Defective output stage or phase module
• MOVIDRIVE B: ramp limit switched off and ramp time set too short
• MOVIDRIVE B: unstable 24 V supply, or broken or shorted signal lines from the phase modules

First checks, in this order

1. Disconnect power, wait 10 minutes, then check the motor cable and motor winding for short circuits.
2. Only switch an output contactor while the output stage is inhibited.
3. Compare the motor rating with the inverter rating and use a smaller motor if it is oversized.
4. MOVIDRIVE B: activate P138 (ramp limit) and/or lengthen the ramp time.
5. MOVIDRIVE B: read the subfault code on the DBG60B or in MotionStudio; it tells you whether the hardware current limit or a specific phase (U, V, W) tripped.
6. If the fault will not reset, the output stage may be defective: contact SEW Service.

F03: Ground fault

What it means: The inverter detected current flowing to ground in the motor, the motor cable or the inverter itself.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Ground fault in the motor lead
• Ground fault in the motor winding
• Ground fault inside the inverter
• MOVITRAC B: an overcurrent condition as for F01

First checks, in this order

1. Disconnect power, wait 10 minutes, disconnect the motor cable and test the insulation of the cable and the motor.
2. Repair the cable or replace the motor if the ground fault is there.
3. If cable and motor test good, the fault may be inside the inverter: replace the MOVITRAC B, or consult SEW Service for a MOVIDRIVE B.
4. On MOVITRAC B, also work through the F01 checks.

F04: Brake chopper

What it means: The brake chopper and braking resistor could not get rid of the energy the motor fed back while braking, or the chopper circuit has failed.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (overcurrent in the brake output, damaged resistor or shorted brake coil; status LED 5x red)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Too much regenerative energy, usually from decelerating a heavy load too fast
• Braking resistor circuit open (broken cable or resistor)
• Short circuit in the braking resistor circuit
• Braking resistance too high for the drive
• Brake chopper defective
• MOVITRAC B: ground fault

First checks, in this order

1. Lengthen the deceleration ramps.
2. Check the supply cable to the braking resistor and look for a short circuit.
3. Check the braking resistor's technical data against what the drive needs.
4. Check for a ground fault.
5. If the chopper is defective, replace the MOVITRAC B or install a new MOVIDRIVE B.

F06: Line phase failure

What it means: The inverter saw a missing supply phase or a poor supply: the DC link voltage keeps dipping, or line voltage or frequency is out of range.^[1][2][3][4]

Also on: MOVIDRIVE B (Line phase failure), MOVITRAC B (Supply system phase failure, 3-phase units only) and MOVIMOT MM..D (Phase failure, detected only under load, status LED 6x red)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking (3-phase inverters only).

Likely causes

• Supply phase missing (blown fuse, loose terminal, bad contactor)
• Line voltage too low or poor line voltage quality
• MOVIDRIVE B: line voltage failure or line frequency fault (subfaults 3 and 4)

First checks, in this order

1. Measure all three phases at the inverter input.
2. Check the supply fuses and the line contactor.
3. Check the supply cable and its terminals.
4. Check how the supply system is configured.
5. MOVITRAC B: this check only runs on 3-phase units.

F07: DC link overvoltage

What it means: The DC link voltage went too high, usually because energy fed back while braking could not be dumped.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (DC link voltage too high, status LED 2x red)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Deceleration ramp too short for the load inertia
• Braking resistor missing, disconnected or wrongly sized
• MOVITRAC B: ground fault
• MOVIMOT MM..D: line voltage outside the permitted range, or brake coil or braking resistor connected wrongly

First checks, in this order

1. Lengthen the deceleration ramps.
2. Check the supply cable to the braking resistor.
3. Check the braking resistor's technical data.
4. Check for a ground fault (MOVITRAC B).
5. MOVIDRIVE B: the subfault shows 2-quadrant or 4-quadrant operation, or the phase involved.
6. MOVITRAC B: if the panel shows F34 after this, the first fault may have been F07; check P080.

F08: Speed monitoring

What it means: The motor did not follow the speed setpoint: the speed or current controller sat at its limit for longer than the monitoring delay, or a maximum speed or frequency was exceeded.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (only when DIP switch S2/4 is ON or additional function 13 is active; status LED slow red flashing)

Drive response: MOVIDRIVE B: Immediate stop (programmable). MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Mechanical overload or a jammed machine
• Phase failure in the supply or in the motor
• MOVIDRIVE B with encoder: encoder wired wrongly or counting in the wrong direction
• MOVIDRIVE B: maximum speed exceeded in torque control, or output frequency above 150 Hz (VFC) or 599 Hz (V/f)
• MOVITRAC B: maximum speed for the VFC operating modes exceeded
• Monitoring delay time set too short

First checks, in this order

1. Reduce the load and check that the machine turns freely.
2. Check the current limit setting and lengthen the ramps.
3. Speed monitoring is set in P500/P502 and its delay time in P501/P503; a longer delay can help, but on hoists too long a delay can let the load sag.
4. Check the line phases, then the motor cable and motor.
5. MOVIDRIVE B with encoder: check the encoder connection and its voltage supply; if the direction is wrong, swap the A/A and B/B pairs.
6. Reduce the maximum speed if it is above the operating mode's limit.

F11: Overtemperature

What it means: The inverter heat sink is too hot, or its temperature sensor reports a fault.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (Thermal overload of the output stage or internal unit error, status LED 3x red)

Drive response: MOVIDRIVE B: Emergency stop (programmable). MOVITRAC B: Stop with interlocking.

Likely causes

• Thermal overload of the inverter
• Poor cooling: fan failure, dirty heat sink, high ambient temperature
• MOVITRAC B: braking resistor mounted on the heat sink adds heat
• MOVIDRIVE B size 7: faulty temperature sensor in a phase module, or overtemperature of the switched-mode power supply

First checks, in this order

1. Reduce the load and make sure cooling is adequate.
2. Check that the fan runs and the air path is clear.
3. MOVITRAC B: if the braking resistor is integrated in the heat sink, mount it externally.
4. MOVIDRIVE B size 7: if F11 appears while the unit is clearly not hot, suspect the phase module's temperature sensor and replace that phase module.

F14: Encoder

What it means: The MOVIDRIVE B lost a valid encoder signal: the encoder is not connected, is defective, or its cable is faulty. The subfault code narrows it down.^[1]

Also on: MOVIDRIVE B only; on MOVITRAC B, encoder problems show as subfault 14 of F116

Drive response: Immediate stop

Likely causes

• Encoder cable or shield not connected correctly
• Short circuit or broken wire in the encoder cable
• Defective encoder or encoder card
• Encoder speed above 6542 min-1 (subfault 25)
• Unknown encoder type at X14 or X15, or a Hiperface or resolver encoder reporting a fault
• Two inverters linked via X14 with P505 set to YES (gives subfault 27)

First checks, in this order

1. Read the subfault code on the DBG60B or in MotionStudio.
2. Check the encoder cable and shield for correct connection, short circuit and broken wire.
3. Check the plug at X15 (motor encoder) and X14 (external encoder).
4. If two inverters are linked via X14, check P505.
5. If cable and connection are good, replace the encoder.

F25: EEPROM

What it means: The inverter could not read or write its parameter memory (EEPROM, memory card or internal non-volatile memory).^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (EEPROM error: set P802 to delivery state and re-parameterize)

Drive response: MOVIDRIVE B: Rapid stop. MOVITRAC B: Stop with interlocking.

Likely causes

• Read or write error on the EEPROM
• MOVIDRIVE B: memory card or memory module defective
• MOVIDRIVE B: initialization fault of the non-volatile memory
• Electrical interference

First checks, in this order

1. Restore factory settings, reset, then set the parameters again (or load a saved parameter set).
2. MOVIDRIVE B: if the subfault points to the memory card, replace the memory card.
3. If the fault comes back, contact SEW Service.

F26: External terminal

What it means: A digital input programmed as external fault has signaled a fault from outside equipment.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (external signal missing at terminal X6:9,10)

Drive response: MOVIDRIVE B: Emergency stop (programmable). MOVITRAC B: Programmable.

Likely causes

• Fault in the external device wired to that input
• Open wire on the external fault input
• Input programmed to external fault by mistake

First checks, in this order

1. Find which digital input is programmed to external fault and which device drives it.
2. Clear the fault in that device or repair the wiring.
3. Reprogram the terminal if it is assigned wrongly.
4. MOVITRAC B: the fault only triggers while the inverter is ENABLED; P830 sets the response.

F28: Fieldbus timeout

What it means: The fieldbus master stopped talking to the MOVIDRIVE B within the set monitoring time.^[1]

Also on: MOVIDRIVE B; for MOVITRAC B with an FSE24B module see F47 and F111

Drive response: Rapid stop (programmable)

Likely causes

• PLC or fieldbus master stopped or lost the connection
• Fieldbus cable or connector fault
• Fieldbus interface did not boot (subfault 2)
• Timeout set too short

First checks, in this order

1. Check the master's communication program and status.
2. Check the fieldbus cable and connectors.
3. Extend the fieldbus timeout in P819, or switch the monitoring off if the application allows it.
4. For subfault 2, check the fieldbus option card.

F31: TF/TH trigger

What it means: The motor thermistor (TF) or winding thermostat (TH) tripped, or its circuit is open.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: No response (programmable in P835). MOVITRAC B: Stop without interlocking, the ready signal stays on.

Likely causes

• Motor too hot
• TF/TH not connected or connected wrongly
• Broken connection between the inverter and the motor sensor

First checks, in this order

1. Let the motor cool down, then reset the fault.
2. Find out why it overheated: load, duty cycle, motor fan, dirty cooling fins.
3. Check the sensor wiring between the inverter and the motor.
4. MOVIDRIVE B with no sensor fitted: jumper X10:1 to X10:2 and set P835 to NO RESPONSE.

F43: RS485 timeout

What it means: Communication over the RS485 interface (PC, keypad or master) stopped.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (Communication timeout: the drive ramps to a stop and runs again when communication returns)

Drive response: MOVIDRIVE B: Rapid stop (programmable). MOVITRAC B: Stop without interlocking, no reset needed.

Likely causes

• PC or keypad cable disconnected or faulty
• MOVITRAC B: communication to an FSE24B module interrupted
• MOVIDRIVE B: the source controlling manual mode was lost (subfault 3)

First checks, in this order

1. Check the RS485 connection between the inverter and the PC or DBG60B.
2. MOVITRAC B: check the FSE24B voltage supply and parameter P808.
3. MOVIDRIVE B subfault 3: check the connection to the control signal source used for manual mode.
4. MOVITRAC B: the message clears by itself once communication is back.

F44: Device utilization

What it means: The inverter's I x t utilization is too high: it has been overloaded for too long (MOVIDRIVE B trips above 125%).^[1][2][3][4]

Also on: MOVIDRIVE B and MOVITRAC B; MOVIMOT MM..D uses 44 for Current limit exceeded (over 500 ms, only with additional function 2)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Load too high for the inverter size
• Ramps too short
• MOVIDRIVE B: UL monitoring fault (subfault 8)

First checks, in this order

1. Reduce the load or the power output.
2. Lengthen the ramps.
3. If neither is possible, fit a larger inverter.

F84: Motor protection

What it means: The inverter's motor thermal model, or the motor temperature sensor it evaluates, says the motor is overloaded.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (Thermal overload of the motor, status LED 4x red; check DIP switches S1/5 and S1/6)

Drive response: MOVIDRIVE B: Emergency stop (programmable). MOVITRAC B: Stop with interlocking.

Likely causes

• Motor utilization too high
• IN-UL monitoring tripped
• MOVIDRIVE B: temperature sensor wire break or short circuit, or P530 changed to KTY after startup
• Motor too small for the duty

First checks, in this order

1. Let the motor cool down, then reset.
2. Reduce the load, lengthen the ramps and allow longer pauses.
3. Check P345/P346 (IN-UL monitoring).
4. MOVIDRIVE B: check the KTY sensor wiring and P530.
5. Consider a larger motor.

F09: Startup

What it means: The inverter has not been started up for the operating mode that is selected.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (wrong drive ID module or additional functions set on DIP switches S2/5 to S2/8)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Startup never performed
• MOVIDRIVE B: wrong operating mode selected, or wrong encoder type or defective encoder card
• MOVITRAC B: unknown motor selected, or VFC and Hoist selected without P207 set

First checks, in this order

1. Run the startup for the required operating mode (MotionStudio or DBG60B).
2. MOVITRAC B: select a different motor, and set P207 when using VFC and Hoist.
3. MOVIDRIVE B: check the encoder type and the encoder card.

F10: IPOS-ILLOP

What it means: The IPOSplus program ran into an invalid command or invalid conditions.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: Emergency stop. MOVITRAC B: Stop with interlocking.

Likely causes

• Wrong command in the IPOSplus program
• Wrong conditions while a command runs
• MOVITRAC B: function not available in this inverter

First checks, in this order

1. Check the program memory content and correct it.
2. Load the correct program into the inverter.
3. Check the program sequence against the IPOSplus manual.

F13: Control signal source

What it means: The selected control signal source is not available or is set wrongly, for example fieldbus selected without a fieldbus card.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Control signal source not defined or defined wrongly
• Fieldbus chosen as source with no fieldbus interface fitted

First checks, in this order

1. Set the correct control signal source in P101.

F17 to F24: System fault

What it means: The inverter electronics were disturbed (stack overflow, undefined opcode, protection fault and similar internal errors).^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (CPU error, codes 17 to 24 and 37)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Electrical interference (EMC)
• Poor grounding or shielding
• Fault in the inverter electronics

First checks, in this order

1. Check grounding and cable shielding and improve them where needed.
2. Reset and watch whether it comes back.
3. If it repeats, contact SEW Service.

F27: No limit switches

What it means: The limit switch inputs make no sense: switches missing, wire break, swapped, or both active at once.^[1]

Also on: MOVIDRIVE B

Drive response: Emergency stop

Likely causes

• Wire break or both limit switches missing
• Limit switches swapped relative to the motor's direction of rotation
• Both limit switches active at the same time

First checks, in this order

1. Check the limit switch wiring.
2. Swap the limit switch connections if they are reversed.
3. Reprogram the terminals if they are assigned wrongly.

F29: Limit switch hit

What it means: A hardware limit switch was reached while running in IPOSplus mode.^[1]

Also on: MOVIDRIVE B

Drive response: Emergency stop

Likely causes

• Axis traveled beyond its range
• Error in the positioning program

First checks, in this order

1. Check the travel range.
2. Correct the user program.

F30: Emergency stop timeout

What it means: The drive did not stop within the emergency stop ramp time.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Drive overloaded
• Emergency stop ramp too short

First checks, in this order

1. Check the project planning (motor and inverter sizing for the load).
2. Lengthen the emergency stop ramp.

F32: IPOS index overflow

What it means: The IPOSplus program broke programming rules and caused an internal stack overflow.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: Emergency stop. MOVITRAC B: Stop with interlocking.

Likely causes

• Faulty IPOSplus user program

First checks, in this order

1. Check and correct the IPOSplus user program (see the IPOSplus manual).

F33: Setpoint source

What it means: The selected setpoint source is not available or is set wrongly, for example fieldbus selected without a fieldbus interface.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Setpoint source not defined or defined wrongly

First checks, in this order

1. Set the correct setpoint source in P100.

F34: Ramp timeout

What it means: The drive took too long to come down its ramp (deceleration, stop or emergency stop ramp).^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Overload during deceleration
• Ramp time set too short for the load
• Enable removed and the drive overran the stop ramp time t13
• MOVITRAC B: a rapid stop response could not reach stop speed in time, and F34 then replaces the original fault

First checks, in this order

1. Lengthen the deceleration and stop ramps.
2. Remove the overload.
3. Check P080 for the fault that started the stop (for example F07).

F35: Operating mode

What it means: On MOVIDRIVE B, the operating mode is not available or does not match the hardware or technology function.^[1]

Also on: MOVIDRIVE B (on MOVITRAC B, F35 means Ex-e protection operating mode, see next row)

Drive response: Immediate stop

Likely causes

• Operating mode not defined or defined wrongly
• P916 set to a ramp type that needs a technology version unit
• P916 ramp type does not match the selected technology function or synchronization time P888

First checks, in this order

1. Set the correct operating mode in P700 or P701.
2. Use a technology version unit (..OT) if the ramp type needs it.
3. Check P916 and P888, and pick the matching technology function in the startup menu.

F35: Ex-e protection operating mode

What it means: On MOVITRAC B driving an explosion-proof (Ex-e) motor, a setting is not allowed for Ex-e operation.^[2][3]

Also on: MOVITRAC B (on MOVIDRIVE B, F35 means Operating mode)

Drive response: Immediate switch-off with interlocking

Likely causes

• Operating mode or function not allowed for Ex-e (only V/f, VFC and VFC hoist; flying start, DC braking and group operation are not allowed)
• Parameter set other than set 1 in use
• Ex-e motor startup not performed
• Frequency points or current limits not set in rising order

First checks, in this order

1. Select V/f, VFC or VFC hoist and switch off flying start, DC braking and group operation.
2. Use parameter set 1 only.
3. Perform the Ex-e motor startup.
4. Set frequency A below B below C, and current limit A below B below C.

F36: Option missing

What it means: An option card the settings need is missing, not allowed, or not supplied.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Option card type not allowed
• Setpoint source, control signal source or operating mode not allowed with this option card
• MOVIDRIVE B: wrong encoder type set for DIP11B
• MOVITRAC B: required option missing, or front module FIO21B not supplied

First checks, in this order

1. Fit the correct option card.
2. Set the correct setpoint source (P100), control signal source (P101) and operating mode (P700 or P701 on MOVIDRIVE B).
3. MOVITRAC B: check P120 and P121 (P121 for FBG11B, P120 and P642 for FIO12B).
4. MOVITRAC B with FIO21B: set P808 to On or supply the basic unit with external 24 V.

F37: System watchdog

What it means: An error occurred while the inverter's system software was running.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (grouped as CPU error)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Electrical interference
• Internal software or hardware fault

First checks, in this order

1. Check grounding and shielding and improve them if needed.
2. Contact SEW Service if it repeats.

F38: System software

What it means: Internal system software fault.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (System software error)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Internal system fault
• Electrical interference

First checks, in this order

1. Check grounding and shielding and improve them if needed.
2. Contact SEW Service if it repeats.

F39: Reference travel

What it means: Homing (reference travel) failed.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop (programmable)

Likely causes

• Reference cam missing or not switching
• Limit switches connected wrongly
• Reference travel type changed during reference travel

First checks, in this order

1. Check the reference cam.
2. Check the limit switch connections.
3. Check the reference travel type and its parameters.

F40: Boot synchronization

What it means: The inverter and an option card did not synchronize in time at power up.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Fault during boot synchronization between inverter and option
• Synchronization ID not sent or sent wrongly

First checks, in this order

1. Power cycle and check that the option card is seated.
2. If it keeps happening, install a new option card.

F41: Watchdog option

What it means: The watchdog between the system software and an option, or the IPOSplus watchdog, timed out.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Communication fault between system software and option software
• Watchdog in the IPOSplus program
• Subfault 17: application module loaded in a unit without technology version, or wrong technology function set

First checks, in this order

1. Check the IPOSplus program.
2. Check that the unit is activated for the application version (P079).
3. Check the selected technology function (P078).
4. Contact SEW Service if it continues.

F42: Lag fault

What it means: During positioning, the axis fell too far behind its setpoint position.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop (programmable)

Likely causes

• Encoder connected wrongly
• Acceleration ramps too short
• Position controller P component too small
• Speed controller parameters wrong
• Lag fault tolerance too small
• Mechanics blocked or binding

First checks, in this order

1. Check the encoder connection and the wiring of encoder, motor and line phases.
2. Lengthen the ramps.
3. Raise the position controller P component and recheck the speed controller parameters.
4. Increase the lag fault tolerance.
5. Check that the mechanics move freely.

F45: Initialization

What it means: The inverter hit an error while initializing at power up.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (Device/motor data error during initialization: restore delivery state with P802)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• MOVIDRIVE B: power section EEPROM parameters not set or set wrongly
• MOVIDRIVE B: option card not making contact with the backplane bus
• Internal fault

First checks, in this order

1. Restore the factory settings.
2. MOVIDRIVE B: reseat the option card.
3. Contact SEW Service if the fault will not reset.

F46: System bus 2 timeout

What it means: Communication on system bus 2 (CAN2) timed out.^[1]

Also on: MOVIDRIVE B

Drive response: Rapid stop (programmable)

Likely causes

• Fault in system bus 2 cabling or a node on it

First checks, in this order

1. Check the system bus connection, termination and the other nodes.

F47: System bus 1 timeout

What it means: Communication on system bus 1 (SBus, CAN1) timed out.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: Rapid stop (programmable). MOVITRAC B: Stop without interlocking, no reset needed.

Likely causes

• Fault in the system bus cabling or a node on it
• MOVITRAC B: FSE24B module not supplied or its EtherCAT communication lost

First checks, in this order

1. Check the system bus connection.
2. MOVITRAC B: check P808, the FSE24B voltage supply and the EtherCAT communication to the FSE24B.
3. MOVITRAC B: the message clears by itself once communication is back.

F57: TTL encoder

What it means: Fault on a TTL encoder at X15 (motor encoder) or X14 (external encoder).^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Encoder cable or shield not connected correctly
• Short circuit or broken wire in the encoder cable
• Defective encoder
• Electrical interference
• Wrong numerator or denominator values

First checks, in this order

1. Check the encoder cable and shield for correct connection, short circuit and broken wire.
2. Improve EMC measures (shield bonding, cable routing).
3. Correct the numerator and denominator values.
4. Replace the encoder if it is defective.

F58: Sine-cosine encoder

What it means: Fault on a sine-cosine encoder at X15 or X14 (amplitude, track signal or initialization).^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Encoder cable or shield not connected correctly
• Short circuit or broken wire in the encoder cable
• Defective encoder
• Electrical interference
• Wrong numerator or denominator values

First checks, in this order

1. Check the encoder cable and shield for correct connection, short circuit and broken wire.
2. Improve EMC measures.
3. Correct the numerator and denominator values.
4. Replace the encoder if the subfault points to initialization or it is defective.

F59: Encoder communication

What it means: Communication with a digital encoder (RS485 or EnDat) at X15 or X14 failed, or the encoder calibration is wrong.^[1]

Also on: MOVIDRIVE B

Drive response: Rapid stop

Likely causes

• Encoder cable or shield not connected correctly
• Track signal or data line fault, short circuit or broken wire
• Clock or data line not connected
• Defective encoder or electrical interference
• Wrong encoder calibration or mechanical offset to the motor (subfault 2)

First checks, in this order

1. Check the encoder cable and shield for correct connection and broken wire.
2. Connect the clock and data lines if missing.
3. For a calibration fault, restore delivery state and do a new startup.
4. Improve EMC measures, then replace the encoder if it still fails.

F77: IPOS control word

What it means: MOVIDRIVE B: an invalid control word was written in IPOSplus mode. MOVITRAC B: an internal system fault.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: No response (programmable). MOVITRAC B: Stop with interlocking.

Likely causes

• MOVIDRIVE B: an external controller tried to set an invalid automatic mode
• MOVIDRIVE B: P916 set to BUS RAMP
• MOVITRAC B: system fault

First checks, in this order

1. MOVIDRIVE B: check the serial connection to the external controller and the values it writes.
2. MOVIDRIVE B: set the correct value in P916.
3. MOVITRAC B: contact SEW Service.

F78: IPOS SW limit switch

What it means: In IPOSplus mode, the programmed target lies outside the software limit switches.^[1]

Also on: MOVIDRIVE B

Drive response: No response (programmable)

Likely causes

• Target position outside the travel range set by the software limit switches

First checks, in this order

1. Check the user program.
2. Check the positions of the software limit switches.

F79: Hardware configuration

What it means: After a memory card was moved to another unit, the stored hardware data do not match the new unit.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Different power rating, nominal voltage, variant, device family or design (technology or standard)
• Different option cards fitted

First checks, in this order

1. Fit the same hardware and option cards as the original unit.
2. Or restore the delivery state (P802 factory setting) and start the unit up again.

F80: RAM test

What it means: Internal fault: the inverter's RAM failed its test.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off.

Likely causes

• Defective RAM in the inverter

First checks, in this order

1. Contact SEW Service; the unit needs repair.

F81: Start condition

What it means: In VFC hoist mode, the inverter could not push the right current into the motor during pre-magnetizing.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (Start condition error, status LED 6x red)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Motor rated power too small compared with the inverter
• Motor cable cross section too small
• Bad connection between inverter and motor
• MOVIDRIVE B with linear motor: enabled before the commutation offset was known

First checks, in this order

1. Check the connection between inverter and motor.
2. Check the startup data and repeat the startup if needed.
3. Check the motor cable cross section and increase it if needed.

F82: Open output

What it means: In VFC hoist mode, two or all output phases are open.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B and MOVIMOT MM..D (Output open error, status LED 6x red)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Two or all motor phases interrupted (cable, terminal, contactor)
• Motor rated power too small compared with the inverter

First checks, in this order

1. Check the connection between inverter and motor, including any output contactor.
2. Check the startup data and repeat the startup if needed.

F86: Memory module

What it means: The MOVIDRIVE B memory card is missing or faulty.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Memory card not inserted
• Memory card defective

First checks, in this order

1. Insert the memory card and tighten its knurled screw.
2. Replace the memory card if defective, then load the delivery state and the parameter set.

F88: Flying start

What it means: In VFC n-CTRL mode, the motor was already turning faster than 6000 min-1 when the inverter was enabled.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Enable given while the motor was spinning above 6000 min-1

First checks, in this order

1. Only enable the inverter when actual speed is 6000 min-1 or less.

F93: DIP encoder fault

What it means: The absolute encoder on the DIP11B option reports a fault.^[1]

Also on: MOVIDRIVE B

Drive response: Emergency stop (programmable)

Likely causes

• Encoder power failure or defective encoder
• Cable between encoder and DIP11B not twisted pair or not shielded
• Clock frequency too high for the cable length
• Encoder's maximum speed or acceleration exceeded

First checks, in this order

1. Check the absolute encoder connection and cables.
2. Set the correct clock frequency.
3. Reduce the maximum travel speed or ramp.
4. Replace the absolute encoder if it is defective.

F94: EEPROM checksum

What it means: The stored data in the EEPROM failed its checksum test.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B (shown as Checksum EEPROM) and MOVIMOT MM..D (EEPROM checksum error)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Defective EEPROM
• MOVIDRIVE B: electronics disturbed by EMC or a defect; invalid configuration data set version (subfault 7)

First checks, in this order

1. MOVIDRIVE B: send the unit in for repair.
2. MOVITRAC B: contact SEW Service.

F95: DIP plausibility fault

What it means: The DIP11B option could not determine a plausible absolute position.^[1]

Also on: MOVIDRIVE B

Drive response: Emergency stop (programmable)

Likely causes

• Wrong encoder type set
• IPOSplus travel parameters set wrongly
• Numerator or denominator factor set wrongly
• Zero adjustment carried out
• Defective encoder

First checks, in this order

1. Set the correct encoder type.
2. Check the IPOSplus travel parameters and the travel speed.
3. Correct the numerator and denominator factor.
4. Reset after a zero adjustment.
5. Replace the absolute encoder if it is defective.

F97: Copy fault

What it means: Copying a parameter set to or from the inverter failed.^[1][2][3][4]

Also on: MOVIDRIVE B, MOVITRAC B (Copy error) and MOVIMOT MM..D (Copy error)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off with interlocking.

Likely causes

• Memory card or parameter module could not be read or written
• Parameter module removed during copying
• Power switched off and on during copying
• Data transmission fault

First checks, in this order

1. Before acknowledging, load the factory setting or the complete data set again.
2. MOVIDRIVE B: restore the delivery state (P802) and repeat the copy.

F98: CRC fault

What it means: Internal fault: the internal flash memory failed its CRC check.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B (CRC flash error)

Drive response: MOVIDRIVE B: Immediate stop. MOVITRAC B: Immediate switch-off.

Likely causes

• Defective flash memory in the inverter

First checks, in this order

1. Send the unit in for repair.

F100: Vibration warning

What it means: The DUV10A vibration sensor reports a warning; the drive keeps running.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: Display fault (programmable)

Likely causes

• Rising vibration on the monitored machine (bearings, unbalance, alignment)

First checks, in this order

1. Find the cause of the vibration; operation can continue until F101 appears.

F101: Vibration fault

What it means: The vibration sensor reports a fault.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: Rapid stop

Likely causes

• Vibration above the fault limit

First checks, in this order

1. Fix the cause of the vibration right away, as SEW recommends.

F102: Oil aging warning

What it means: The gear unit oil aging sensor reports a warning.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: Display fault (programmable)

Likely causes

• Gear oil nearing the end of its life

First checks, in this order

1. Schedule an oil change.

F103: Oil aging fault

What it means: The gear unit oil aging sensor reports a fault.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: Display fault (programmable)

Likely causes

• Gear oil worn out

First checks, in this order

1. Change the gear unit oil right away, as SEW recommends.

F106: Brake wear

What it means: The motor brake lining is worn.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: Display fault (programmable)

Likely causes

• Brake lining worn down

First checks, in this order

1. Replace the brake lining (see the motor operating instructions).

F107: Line components

What it means: With a regenerative power supply only: the main contactor did not send back its feedback signal.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Main contactor defective
• Control cable fault

First checks, in this order

1. Check the main contactor.
2. Check the control cables.

F110: Ex-e protection

What it means: An explosion-proof (Ex-e) motor ran below 5 Hz for longer than allowed.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: Emergency stop

Likely causes

• Operation below 5 Hz too long for the Ex-e motor

First checks, in this order

1. Check the configuration and project planning.
2. Shorten the time spent below 5 Hz.

F111: System bus (SBus) error

What it means: Sent to the EtherCAT or fieldbus master to report that communication between the FSE24B module and the MOVITRAC B is broken; the MOVITRAC B itself shows F47.^[2][3]

Also on: MOVITRAC B

Likely causes

• FSE24B plug connection loose or faulty

First checks, in this order

1. Check the FSE24B plug connection.
2. Check F47 on the inverter.

F113: Analog input wire break

What it means: Wire break detected on analog input AI1.^[1][2][3]

Also on: MOVIDRIVE B and MOVITRAC B

Drive response: MOVIDRIVE B: No response (programmable). MOVITRAC B: Programmable.

Likely causes

• Broken or loose wire on AI1
• Sensor or setpoint source not supplying a signal

First checks, in this order

1. Check the wiring to AI1.
2. MOVIDRIVE B: check the startup settings.

F116: Timeout MOVI-PLC

What it means: On MOVIDRIVE B, communication with the MOVI-PLC controller timed out.^[1]

Also on: MOVIDRIVE B (on MOVITRAC B, F116 means Software module error, see next row)

Drive response: Rapid stop/warning

Likely causes

• MOVI-PLC communication interrupted

First checks, in this order

1. Check the startup settings.
2. Check the wiring to the MOVI-PLC.

F116: Software module error

What it means: On MOVITRAC B, an application software module reports an error; the subfault shows which.^[2][3]

Also on: MOVITRAC B (on MOVIDRIVE B, F116 means Timeout MOVI-PLC)

Likely causes

• Subfault 14: encoder fault
• Subfault 29: limit switch hit
• Subfault 42: lag error
• Subfault 78: software limit switch hit

First checks, in this order

1. Read the subfault code.
2. Subfault 14: check the encoder and its cable.
3. Subfaults 29 and 78: check the travel range and the limit switch positions.
4. Subfault 42: check ramps, controller settings and that the mechanics move freely.

F122: Absolute encoder option

What it means: An absolute encoder at X15 or X14 reports a fault (unknown type, plausibility, communication, internal or temperature problem).^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Unknown encoder type connected
• Encoder cable or shield not connected correctly, short circuit or broken wire
• Defective encoder or electrical interference
• Internal encoder fault
• Soiled or damaged encoder, or encoder temperature too high

First checks, in this order

1. Read the subfault code; it shows X15 or X14 and the type of fault.
2. Check the encoder cable and shield for correct connection, short circuit and broken wire.
3. Improve EMC measures.
4. For temperature subfaults, reduce motor and ambient temperature and improve ventilation.
5. Replace the encoder for internal encoder faults or an unknown type.

F123: Positioning interruption

What it means: When an interrupted positioning move was resumed, target monitoring found the target would be overrun.^[1]

Also on: MOVIDRIVE B

Drive response: Emergency stop (programmable)

Likely causes

• Positioning interrupted and resumed too close to the target

First checks, in this order

1. Let positioning moves finish without interruption.
2. Check the IPOSplus or application program sequence for the interruption.

F196: Power section

What it means: Fault in the power section hardware of a large MOVIDRIVE B (discharge resistor, precharge and discharge control, inverter coupling, phase modules, DC link fan); the subfault tells which.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Discharge resistor overloaded (subfault 1); SEW points to the waiting time between power off and power on
• Defective inverter coupling or precharge/discharge control
• Different phase modules installed in the unit
• Defective DC link fan (subfault 18)
• Communication fault between power section and control unit

First checks, in this order

1. Observe the waiting time between power off and power on.
2. Read the subfault code.
3. Check the cabling between the control unit and the power section.
4. Check whether the DC link choke fan is connected and working.
5. Contact SEW Service; the subfault often points to a part to replace.

F197: Supply system

What it means: Line overvoltage at the start of precharging (motor inverter) or line undervoltage (line inverter).^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Poor line voltage quality

First checks, in this order

1. Check the supply, fuses and contactor.
2. Check how the supply system is configured.

F199: DC link charging

What it means: Precharging was aborted because the DC link could not be charged.^[1]

Also on: MOVIDRIVE B

Drive response: Immediate stop

Likely causes

• Precharge circuit overloaded
• Too much capacitance connected to the DC link
• Short circuit in the DC link

First checks, in this order

1. Check the DC link connection, especially where several units share a DC link.
2. Check the connected DC link capacitance against the design.

F15: 24 V monitoring

What it means: On MOVIMOT MM..D, the 24 V supply dipped.^[4]

Also on: MOVIMOT MM..D (status LED slow red flashing)

Likely causes

• Voltage dip in the 24 V supply

First checks, in this order

1. Check the 24 V supply (DC 24 V plus or minus 25%, residual ripple 13% at most).
2. Reset by switching the 24 V supply off or with an error reset.

F89: Overtemperature of the brake

What it means: On MOVIMOT MM..D, the brake coil is thermally overloaded or connected wrongly.^[4]

Also on: MOVIMOT MM..D (status LED 5x red)

Likely causes

• Brake coil thermally overloaded (ramp too short)
• Defective brake coil
• Brake coil and braking resistor both connected
• Brake coil connected wrongly
• Inverter does not match the motor (if it appears right after the first enable)

First checks, in this order

1. Lengthen the ramp time.
2. Connect either the brake or the braking resistor, not both.
3. Check the brake coil connection.
4. Check DIP switches S1/6 and S2/1 and the motor and inverter combination.
5. Contact SEW Service if the brake coil is defective.

F90: Output stage detection

What it means: On MOVIMOT MM..D, the inverter and motor combination is not permitted.^[4]

Also on: MOVIMOT MM..D (status LED slow red flashing)

Likely causes

• Wrong DIP switch settings S1/6 or S2/1
• Wrong motor connection type
• Drive ID module does not fit the motor or is not plugged in correctly
• Inverter power rating does not suit the motor

First checks, in this order

1. Check and correct DIP switches S1/6 and S2/1.
2. Check the motor connection type.
3. Check that the drive ID module fits the motor and is seated.
4. Use an inverter or motor with a matching power rating.

F91: Communication timeout bus module (MOVIMOT)

What it means: Timeout between the fieldbus interface and the MOVIMOT inverter; the fieldbus interface reports it to the higher-level controller.^[4]

Also on: MOVIMOT MM..D

Likely causes

• Communication link between fieldbus interface and MOVIMOT interrupted

First checks, in this order

1. Check and restore the link between the fieldbus interface and the MOVIMOT inverter.
2. Read the fault in the higher-level controller, since only the fieldbus interface reports it.