Fanuc αi Series AC Servo Motor and Spindle

This alarm may be generated in the αi PSR when the spindle decelerates, particularly if a regenerative discharge unit with a resistance of 16Ω is used with a spindle motor having a maximum output of 5 kW or more. This indicates that the unit is not effectively dissipating regenerative energy.

An over-current condition has occurred in the DC link during power running operation of the motor. This indicates excessive current draw, potentially due to motor load or amplifier issues.

An over-current condition has occurred in the DC link during motor regeneration (deceleration). This indicates an issue with handling regenerative energy, potentially due to load or regenerative discharge unit problems.

An over-current condition has occurred in the charge current path to the Capacitor Modules of the ECM. This suggests an issue with the charging circuit or a fault in the capacitor modules themselves.

An over-current condition has occurred in the discharge current path from the Capacitor Modules of the ECM. This indicates a problem with the discharge circuit, potentially during emergency stop or an internal fault.

The 24V control power supply voltage to the ECM has dropped below the acceptable threshold. This can lead to improper operation or shutdown of the ECM.

The DC link voltage in the servo amplifier system has exceeded the upper threshold. This can be caused by excessive regenerative energy not being dissipated or an issue with the power supply.

The voltage across the Capacitor Module of the ECM has exceeded its maximum safe operating voltage. This indicates an issue with charge control or excessive regenerative energy.

The voltage across the Capacitor Module of the ECM has dropped below its minimum operating voltage. This can indicate an insufficient charge or a problem with the charge circuit.

The Control Module of the ECM has detected an abnormal temperature, indicating overheating. This can be caused by poor ventilation, excessive load, or a fault in the module itself.

This alarm indicates an incorrect detection of a sensor signal disconnection, potentially due to wiring issues in the motor terminal box or non-shielded cable portions. This can also lead to large variations in low-speed motor operation.

This alarm indicates an incorrect detection of an abnormal sensor signal, potentially due to wiring issues in the motor terminal box or non-shielded cable portions. This can also lead to large variations in low-speed motor operation.

The cooling fan for the heat sink of the Control Module has stopped. This can lead to overheating of the Control Module and reduced operating life of its components. Note that even if ECM works continuously, the cooling fan should be exchanged early.

This alarm indicates that the absolute position data for the Pulsecoder may be lost or displaced, often occurring if the sensor head is moved after the initial power-on and conduction state, or if the battery is depleted/disconnected.

A general alarm indicating an issue with the power supply providing power to the ECM system. This could be due to input voltage problems or an internal fault in the power supply unit.

The Capacitor Modules are not charging as expected. This indicates a problem with the charging process or a fault within the capacitor modules preventing them from holding charge.

The Capacitor Modules are not discharging as expected, indicating a potential malfunction of the discharge circuit or the Resistor Module itself.

The Capacitor Modules are not discharging due to a malfunction of the discharge circuit. This points to a failure within the Resistor Module's components or control.

The Resistor Module has detected an abnormal temperature, indicating overheating. This is typically detected by a built-in thermostat.

A communication error has occurred between modules within the ECM system. This indicates a problem with the data link or signal integrity between internal components.

Communication between the sensor and spindle amplifier is not performed. This error indicates a critical issue in the serial data link preventing proper operation.

Serial data transmission/reception is not performed normally between the sensor and the spindle amplifier. This indicates a problem with the data integrity or timing.

An abnormal acceleration rate has been detected in the spindle motor. This indicates that the motor is accelerating too rapidly or outside its expected operational limits.

An error occurred in the interpolation circuit of the spindle control system. This typically indicates an issue with the feedback signal processing, leading to inaccurate position or speed control.

The number of pulses between one phase Z and another (e.g., phase A/B) is shifted by 4λ or more. This indicates a significant discrepancy in the encoder feedback signals, affecting accurate position tracking.

No absolute position is established within 5 turns immediately after communication between the spindle amplifier and sensor is started. This indicates a failure to detect the absolute reference mark.

A potential difference across a capacitor module is more than 300V, indicating an energy supply issue or abnormal voltage condition.

The circuit responsible for controlling the current within the ECM has malfunctioned. This is a critical internal fault affecting the ECM's ability to manage power flow.

The fuse within the Capacitor Module has blown. This indicates an over-current condition or a short circuit within the Capacitor Module. The LED (D2) in the front of a Capacitor Module that the fuse was blown turn off the light.