SEW 8165424.50

Common Fault Codes

Fault: Overcurrent

The output current has exceeded the permissible peak current limit, indicating a possible short circuit, motor winding fault, or excessively aggressive acceleration ramp.
Check motor cable insulation and winding resistance. Verify acceleration/deceleration ramp settings in MOVITOOLS MotionStudio. Inspect for mechanical blockage on the driven axis.

Fault: DC Bus Overvoltage

The DC bus voltage has risen above the maximum permissible threshold, typically caused by regenerative energy during deceleration that cannot be dissipated.
Check braking resistor connection and resistance value. Extend deceleration ramp time. Verify that the supply module rating is adequate for the total regenerative load.

Fault: DC Bus Undervoltage

The DC bus voltage has dropped below the minimum operating threshold, indicating a mains supply interruption or supply module fault.
Check mains input voltage at the supply module. Inspect fuses and contactors in the supply circuit. Verify that the supply module is correctly sized for the connected axis modules.

Fault: Motor Overtemperature

The motor temperature sensor (KTY or PTC) has signalled that the motor winding temperature exceeds the permissible limit.
Allow the motor to cool before restarting. Check that the motor cooling fan is operational. Verify that the duty cycle and load are within the motor's rated specification.

Fault: Encoder/Feedback Error

A fault has been detected in the feedback signal from the motor encoder or resolver, which may indicate a wiring fault, damaged encoder, or incorrect parameter setting.
Inspect encoder cable for damage, correct shielding, and secure connector seating. Verify encoder type and resolution parameters in the drive configuration. Replace encoder if signal quality tests fail.

Fault: Safe Torque Off (STO) Active

The STO safety function has been triggered, removing the gate drive signals and preventing torque generation. This may be an intentional safety stop or an unintended activation.
Verify that the STO input signals are correctly applied and that the safety circuit is in the correct state. Check wiring to the STO terminals. Reset the safety function via the control system once the safe state is confirmed.

Fault: System Bus Communication Error

Communication on the internal MOVIAXIS system bus between axis modules and the supply or master module has been interrupted or is returning errors.
Check the system bus ribbon cable connections between all modules on the mounting rail. Ensure all modules are correctly seated. Inspect for damaged connectors or cables and replace as necessary.

Fault: Heat Sink Overtemperature

The internal heat sink temperature sensor has detected a temperature above the permissible operating limit, typically due to inadequate cooling or excessive load.
Check that the control cabinet ventilation is adequate and that cooling fans are operational. Verify that the ambient temperature is within specification. Reduce duty cycle or consider a higher-rated module if overloading is confirmed.