SEW MDX61B0220-503-4-00

Common Fault Codes

F01

Overcurrent: Output current has exceeded the permissible peak value, typically caused by a short circuit, motor wiring fault, or excessively rapid acceleration.
Check motor wiring and insulation resistance. Verify motor parameters are correctly programmed. Increase acceleration ramp time (P130/P131). Inspect output terminals for short circuits.

F02

Overvoltage: DC link voltage has exceeded the maximum threshold, typically caused by regenerative energy during deceleration or excessively high supply voltage.
Increase deceleration ramp time (P136/P137). Verify supply voltage is within specification. Check brake chopper and braking resistor for correct sizing and connection.

F03

Undervoltage: DC link voltage has dropped below the minimum permissible level, indicating a supply voltage dip or phase loss.
Check supply voltage at input terminals L1, L2, L3. Verify all three phases are present and within tolerance. Inspect input fuses and contactor.

F07

Speed monitoring fault: Actual motor speed deviates from the setpoint beyond the configured tolerance window, indicating a mechanical overload, encoder fault, or incorrect parameterization.
Check mechanical load for jamming or excessive friction. Verify encoder wiring and signal quality. Review speed monitoring parameters (P500–P503) and adjust tolerance window if necessary.

F08

Motor overtemperature: The motor thermal model or PTC/KTY sensor has detected an overtemperature condition.
Allow motor to cool before restarting. Check motor ventilation and ambient temperature. Verify PTC/KTY sensor wiring at terminal X10. Review motor load cycle and thermal model parameters.

F11

Brake fault: The brake control output has detected an error, such as a missing brake feedback signal or brake not releasing correctly.
Check brake wiring and coil resistance. Verify brake feedback contact wiring at binary inputs. Inspect brake rectifier and mechanical brake condition.

F14

Fieldbus timeout: Communication with the fieldbus master has been interrupted or the watchdog timer has expired.
Check fieldbus cable connections and network topology. Verify master controller is active and transmitting cyclic data. Review timeout parameter settings in the fieldbus option module.

F43

Option card fault: An installed option card (e.g., encoder interface, fieldbus module) has reported an internal error or is not recognized correctly.
Power down the drive and reseat the option card. Check that the card is correctly inserted in the designated slot. Replace the option card if the fault persists after reseating.