SEW Eurodrive [PDF] Operating Instructions

An excessive current flow has been detected in the inverter's output stage, indicating a potential short circuit. This can occur between motor phases, between a phase and ground, or within the motor winding itself. Such an event poses a significant risk of damage to the inverter's power components and potentially the motor.

The drive has detected a missing phase in the supply system leads. This fault is typically only detectable when the drive is operating under load, indicating an imbalance or complete loss of one or more input phases. Continued operation with a phase failure can lead to damage in both the motor and the inverter.

The DC link voltage within the inverter has exceeded its permissible upper threshold. This condition commonly arises from regenerative energy fed back from the motor, often due to excessively short ramp-down times. Other causes include faulty braking resistor connections, incorrect resistor values, or an impermissible supply input voltage. High DC link voltage can damage the inverter's DC bus capacitors and output stage.

The drive's speed monitoring function has been triggered, indicating that the drive is operating under an excessive load. This causes the drive to deviate significantly from its commanded speed or exceed a predefined slip limit. This monitoring is typically active when DIP switch S4/2 (for AS-interface versions) or S2/4 (for standard versions) is 'ON', or if additional function 13 is active. Persistent overloading can lead to motor and inverter damage.

The inverter's output stage or an internal unit has reached an excessive operating temperature. This can be caused by restricted airflow to the heatsink, high ambient temperatures, inadequate ventilation leading to heat build-up, or excessive load on the drive system. Sustained overtemperature can result in permanent damage to the inverter components.

A general CPU error has occurred within the inverter's control unit, indicating an internal processing fault or instability within the microcontroller. These types of errors typically require a complete power cycle of the unit to clear the fault and restore normal operation.

An error has been detected in the EEPROM (Electrically Erasable Programmable Read-Only Memory) of the inverter. This indicates a problem with reading or writing configuration data, which can lead to incorrect operation, loss of settings, or system malfunction. A reset may clear temporary issues.

The drive has operated at its current limit for longer than 500 ms while the 'Adjustable current limitation' (Additional function 2) is active. This function monitors current above 15 Hz and triggers a fault if the set maximum current (Imax [%] of IN) is continuously exceeded. This indicates the motor is drawing excessive current due to load or an inappropriately set current limit, posing a risk of motor and inverter damage.

The motor has exceeded its safe operating temperature or has stalled. This fault can be triggered by incorrect motor protection settings (DIP switches), insufficient cooling, high ambient temperatures, excessive motor load, or an incorrect drive-motor combination. The fault also trips if the standard MOVIMOT motor protection is deactivated via DIP switch S1/5 (standard version) or S3/1 (AS-i version) and an external TH winding thermostat wired to the terminals for direction of rotation trips. Sustained motor overtemperature significantly shortens motor lifespan.

The brake coil has experienced thermal overload, indicates a defect, is incorrectly connected, or its internal resistance is not correct. This condition can result from excessively short ramp times, prolonged brake engagement, or an improper drive-inverter combination. A faulty brake coil compromises the holding function, which can lead to uncontrolled movement or mechanical system damage.

The assigned motor type does not correctly match the MOVIMOT inverter, for example, an MM03 inverter paired with a DT71D4 motor. This mismatch can lead to incorrect operational characteristics, insufficient or improper motor protection, and potentially premature component failure or reduced performance.