Motor malfunctions

The following table shows fault diagnostics options for malfunctions of the motor:

Fault	Possible cause	Measure
Motor at standstill, will not start	Motor terminal or function module not active	Set ENABLE signal and activate motor. Terminal or function module
	Overload	Check load and reduce if necessary. Then restart and enable the motor terminal or the function module. Set ENABLE signal.
	Phase interruption in the power supply system or offset motor phases	Check motor terminal, function module, power cable and encoder cable/signal cable. Replace defective cables.
	Short circuit or earth fault in the power cable	Replace defective power cable, then measure and check.
Motor sluggish	Motor terminal or function module not active	Set ENABLE signal and activate motor. Terminal or function module
	Overload	Check load and reduce if necessary. Then restart and enable the motor terminal or the function module. Set ENABLE signal.
	Phase interruption after the supply	Check motor terminal, function module, power cable and encoder cable/signal cable. Replace defective cables.
	Faulty shielding on encoder cable/signal cable or power cable	Check ground connection and shielding.
	Short circuit or earth fault in the power cable	Replace defective power cable, then measure and check.
	Power cable not plugged in correctly	Check the plug connectors on the motor and on the power supply system.
	Interruption in the encoder cable/signal cable or power cable	Check that the cable is not pinched and that no wires are broken. Replace defective cables.
No braking	Short circuit or earth fault in the power cable	Replace defective power cable, then measure and check.
	Power cable not plugged in correctly	Check the plug connectors on the motor and on the power supply system.
	Interruption in the encoder cable/signal cable or power cable	Check that the cable is not pinched and that no wires are broken. Replace defective cables.
Noises when starting up	Phase interruption after the supply	Check motor terminal, function module, power cable and encoder cable/signal cable. Replace defective cables.
	Faulty shielding on encoder cable/signal cable or power cable	Check ground connection and shielding.
	Short circuit or earth fault in the power cable	Replace defective power cable, then measure and check.
	Power supply system not plugged in correctly	Check the plug connectors on the motor and on the power supply system.
	Interruption in the encoder cable/signal cable or power cable	Check that the cable is not pinched and that no wires are broken. Replace defective cables.
Noises during operation	Motor terminal or function module not active	Set ENABLE signal and activate motor. Terminal or function module
	Overload	Check load and reduce if necessary. Then restart and enable the motor terminal or the function module. Set ENABLE signal.
	Phase interruption after the supply	Check motor terminal, function module, power cable and encoder cable/signal cable. Replace defective cables.
	Faulty shielding on encoder cable/signal cable or power cable	Check ground connection and shielding.
	Short circuit or earth fault in the power cable	Replace defective power cable, then measure and check.
	Power supply system not plugged in correctly	Check the plug connectors on the motor and on the power supply system.
	Interruption in the encoder cable/signal cable or power cable	Check that the cable is not pinched and that no wires are broken. Replace defective cables.
	Motor terminal or function module gain set too high.	Reconfigure the parameters of the motor terminal or the function module and adjust them if necessary.
High temperature at no-load speed	Too little heat dissipation via the flange connection	Dimension the flange according to the technical data.
High temperature under load	Motor terminal or function module not active	Set ENABLE signal and activate motor. Terminal or function module
	Overload	Check load and reduce if necessary. Then restart and enable the motor terminal or the function module. Set ENABLE signal.
	Phase interruption after the supply	Check motor terminal, function module, power cable and encoder cable/signal cable. Replace defective cables.
	Faulty shielding on encoder cable/signal cable or power cable	Check ground connection and shielding.
	Too little heat dissipation via the flange connection	Dimension the flange according to the technical data.
	Motor too small	Check motor design and adapt to the application. If necessary, select a larger motor.
Uneven running	Faulty or insufficient shielding on encoder cable/signal cable or power cable	Check ground connection and shielding.
Uneven running	Motor terminal or function module gain set too high.	Reconfigure the parameters of the motor terminal or the function module and adjust if necessary.
Grinding noises	Contamination or foreign bodies inside the motor	Contact SEW‑EURODRIVE Service
	Rotating parts rub against the housing or motor components.	Check and eliminate chafe marks.
	Defective bearings; irreparable motor damage	Contact SEW‑EURODRIVE Service
Error in the output stage	Short circuit or earth fault in the power cable	Replace defective power cable, then measure and check.
	Short circuit or earth fault in the motor	Replace defective motor, then measure and check.
	Insufficient power supply	Check the settings in the configuration and read out the electronic nameplate again.
Feedback error	Encoder cable/signal cable interrupted or pinched	Check that the cable is not pinched and that no wires are broken. Replace defective cables.
	Connectors of the encoder cables/signal cables not plugged in correctly	Check that the plug connector is correctly fit.
	Loose fit of the plug connectors or no connection between the contacts and the motor connection	Check plug connector. If necessary, contact Beckhoff Service.