Diagnostics

Observation	Possible cause	Remedy measures
Motor does not develop any torque and does not start.	Power supply interrupted	Check connections and wiring; measure the supply voltage
	One of the phases interrupted in the supply line / motor winding	Check the inverter and power supply of the motor; determine the winding resistances and insulation resistances in agreement with the AMK customer service
	Error in converter	Read out the diagnostic number
	Incorrect parameters	Check parameters, e.g. torque limits, operating mode, setpoint specifications
Motor drones and has a high current consumption Motor does not start, or only with difficulty	Motor blocked	Make sure the motor is de-energised and, with the brake opened, check whether the shaft and equipped power transmission elements can move/rotate freely.
	Motor overload	Reduce load
	Brake does not open	See observation "Brake does not open"
	Malfunction in the signal feedback of the encoder	Check the encoder cable and signals
	Motor parameters are incorrect	Check the setting for the motor type; check the group of motor parameters for correct parameterisation
	Winding short circuit or phase-to-phase fault in the stator winding	Determine the winding resistances and insulation resistances, contact the AMK customer service
	One of the phases interrupted in the supply line/motor winding	Check the inverter and power supply of the motor; under consultation with the AMK customer service, determine the winding resistances and insulation resistances
	Disturbed setpoint	Check setpoint and commanding
Motor makes uncontrolled movements	Incorrect motor parameters Error in encoder signal feedback	Check the setting for the motor type; check the group of motor parameters for correct parameterisation
Motor makes uncontrolled movements	Disturbed setpoint	Check setpoint and commanding
Wrong direction of rotation	Wrong polarity	Is the phase sequence of the motor connections correct? In the parameter settings, check the setpoints, control circuit polarities, settings for the direction of rotation
Radial vibrations	Rotor out of balance	Decouple the rotor from the load and check whether the imbalance is caused by the motor or by the load.
	Rotor out of true; shaft bent	Contact the AMK customer service
	Drive elements or motor not properly aligned	Re-align components
	Coupled load out of balance	Rebalance and align the coupled load and check whether the imbalance is caused by the motor or by the load.
	Imbalance originating from gearing or load	Check runout of gearing or of the load
Axial vibrations	Drive elements or motor not properly aligned	Re-align components
	Shocks from coupled machine	Check coupled machine
	Imbalance originating from gearing	Check runout of gearing
Running noises at / in the motor	Bearing damage	Contact the AMK customer service
	Vibration of rotating parts	Eliminate the cause and the imbalance
	Rotating parts are grinding	Rework the parts concerned
	Loose parts / foreign items in the motor	Contact the AMK customer service
Motor gets too hot	Drive overload Rated data as per EN 60034 exceeded, e.g. too high effective torque	Measure power, reduce load, check motion profile, check drive configuration, use larger motor
	Ambient temperature too high	Observe permissible temperature range
	Inadequate cooling	Check efficiency of cooling Is surface dirty? Cooling loop ok?
	Optimise parameterisation in inverter	Check motors and control parameters; adapt speed and torque limits
Brake does not open	Brake not correctly connected	Check brake connections
	Max. permissible air gap of the brake exceeded	Contact the AMK customer service
	Short circuit in the coil or at body of brake coil	Contact the AMK customer service
No or too low holding torque, although brake is engaged	Brake pads worn	Contact the AMK customer service
No or too low holding torque, although brake is engaged	Adjust air gap	Contact the AMK customer service
Noise (squeaking) in the brake area	Brake parameters incorrectly configured in the inverter	Check the brake opening and closing times ID206 'Drive on delay time' ID207 'Drive off delay time'
Noise (squeaking) in the brake area	Mechanical defect	AMK customer service
Motor brake does not hold	Brake pads worn	Contact the AMK customer service
Overheating of individual winding sections	Winding short circuit or phase-to-phase fault in the stator winding	Determine the winding resistances and insulation resistances, contact the AMK customer service DC-operation mode
Uneven running	Inadequately shielded motor cable and encoder cable	Check shielding and earth
	Amplification of the drive controller too large	Check and adapt controller parameters
	Mechanics	check mechanics

AMK customer service:

E-mail: service@amk-group.com
Telephone: +49 7021/50 05-190
Fax: +49 7021/50 05-193