Fanuc Alpha Series

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.

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.

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 invalid parameter setting alarm occurs when initialization bit 0 is set to 1, and the number of velocity pulses configured exceeds the maximum allowable value of 13100. This indicates an incorrect setup for velocity feedback, potentially leading to calculation overflows.

This invalid parameter setting alarm occurs when initialization bit 0 is set to 1, and the number of position pulses configured exceeds the maximum allowable value of 13100. This indicates an incorrect setup for position feedback, potentially leading to calculation overflows.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity loop integral gain has overflowed. This typically occurs when the parameter setting for the integral gain is excessively high, leading to calculation errors.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity loop integral gain has overflowed. This typically occurs when the parameter setting for the integral gain is excessively high, leading to calculation errors.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity loop proportional gain has overflowed. This typically occurs when the parameter setting for the proportional gain is excessively high, leading to calculation errors.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity loop proportional gain has overflowed. This typically occurs when the parameter setting for the proportional gain is excessively high, leading to calculation errors.

This invalid parameter setting alarm indicates that the internal calculation value of the observer parameter POA1 has overflowed. This suggests an incorrect setting for the observer parameter, causing internal calculation limits to be exceeded.

This invalid parameter setting alarm indicates that the internal calculation value of the observer parameter POA1 has overflowed. This suggests an incorrect setting for the observer parameter, causing internal calculation limits to be exceeded.

This invalid parameter setting alarm indicates that the internal calculation value of a parameter related to dead zone compensation has overflowed. This typically happens when the compensation setting is too high, leading to mathematical limits being exceeded.

This invalid parameter setting alarm indicates that the internal calculation value of a parameter related to dead zone compensation has overflowed. This typically happens when the compensation setting is too high, leading to mathematical limits being exceeded.

This invalid parameter setting alarm indicates that the internal calculation value of a parameter related to dead zone compensation has overflowed. This typically happens when the compensation setting is too high, leading to mathematical limits being exceeded.

This invalid parameter setting alarm indicates that the internal calculation value of a parameter related to dead zone compensation has overflowed. This typically happens when the compensation setting is too high, leading to mathematical limits being exceeded.

This invalid parameter setting alarm indicates that the internal calculation value of the feed-forward coefficient has overflowed. This suggests the coefficient setting is too high or requires a different calculation method to accommodate the value.

This invalid parameter setting alarm indicates that the internal calculation value of the feed-forward coefficient has overflowed. This suggests the coefficient setting is too high or requires a different calculation method to accommodate the value.

This invalid parameter setting alarm indicates that the internal calculation value of the feed-forward coefficient has overflowed. This suggests the coefficient setting is too high or requires a different calculation method to accommodate the value.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity feed-forward coefficient has overflowed. This typically occurs when the coefficient setting is too high for the system's internal processing limits.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity feed-forward coefficient has overflowed. This typically occurs when the coefficient setting is too high for the system's internal processing limits.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity feed-forward coefficient has overflowed. This typically occurs when the coefficient setting is too high for the system's internal processing limits.

This invalid parameter setting alarm indicates that the internal calculation value of the velocity feed-forward coefficient has overflowed. This typically occurs when the coefficient setting is too high for the system's internal processing limits.

This invalid parameter setting alarm indicates an overflow in a parameter that is currently not in use by the system. The parameter's value should be explicitly set to 0 as it serves no active function.

This invalid parameter setting alarm indicates an overflow in a parameter that is currently not in use by the system. The parameter's value should be explicitly set to 0 as it serves no active function.

This invalid parameter setting alarm indicates an overflow in a parameter that is currently not in use by the system. The parameter's value should be explicitly set to 0 as it serves no active function.

This invalid parameter setting alarm indicates an overflow in a parameter that is currently not in use by the system. The parameter's value should be explicitly set to 0 as it serves no active function.

This invalid parameter setting alarm occurs when a positive value is not set as the flexible feed gear numerator, or when the numerator's value is greater than the denominator. This applies to systems other than parallel type separate detectors and indicates an invalid gear ratio configuration.

This invalid parameter setting alarm occurs when a positive value is not set for the flexible feed gear denominator. A positive value is required for correct operation of the feed gear calculation.

This invalid parameter setting alarm occurs for an axis equipped with a serial type separate detector when the machine velocity feedback coefficient is set to a value exceeding 100. The upper limit for this coefficient on such axes is strictly 100, and exceeding it causes an error.

This invalid parameter setting alarm indicates that the internal calculation value of the machine velocity feedback coefficient has overflowed. This usually happens if the coefficient is set too high, exceeding internal processing limits.

This invalid parameter setting alarm indicates that the internal calculation value of the machine velocity feedback coefficient has overflowed. This usually happens if the coefficient is set too high, exceeding internal processing limits.

This invalid parameter setting alarm indicates that the internal calculation value of the machine velocity feedback coefficient has overflowed. This usually happens if the coefficient is set too high, exceeding internal processing limits.

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.

This invalid parameter setting alarm indicates that the internal calculation value of a parameter related to runaway detection has overflowed. This suggests an issue with the runaway detection function's configuration, leading to computational errors.

This invalid parameter setting alarm indicates that the internal calculation value of a parameter related to runaway detection has overflowed. This suggests an issue with the runaway detection function's configuration, leading to computational errors.

This invalid parameter setting alarm occurs when the ITP (Interpolation Time Period) cycle is 16 ms, but an incorrect 500 μs is selected as the velocity control cycle. For this ITP cycle, the velocity control cycle must be 2 ms.

This invalid parameter setting alarm occurs when a linear motor is in use, and the closed loop is inadvertently set. For series other than the Series 9080, the closed loop function is incompatible with linear motors.

This invalid parameter setting alarm occurs when a linear motor is used, and the scale reverse connection bit (parameter 1960#0 for Series 15 or 2018#0 for Series 16, etc.) is set. This specific bit is not applicable and cannot be used with linear motors.

This invalid parameter setting alarm indicates that the currently installed amplifier does not support the HC (High Current) alarm prevention function, despite the corresponding function bit being enabled. Continued use with the bit enabled may cause unexpected behavior or issues.

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 is issued when the separate phase A/B scale is used. It indicates a hardware disconnection related to the phase A/B detector.

This alarm is issued when the change in position feedback pulses is relatively small for the change in velocity feedback pulses. This condition typically occurs in a closed-loop system and is not issued with the semi-closed loop.

This alarm can indicate two primary issues depending on the set bits. If DTE, CRC, and STB bits are set, it signifies a communication alarm in the serial pulse coder, potentially due to noise, cable issues, or defective hardware. If the PRM bit is set, it indicates an invalid parameter setting detected by the servo software.

This alarm can indicate multiple issues depending on the set bits. If the OFS bit is set, it is a Feedback Mismatch alarm, suggesting opposite move directions for the position and velocity detectors. Other bits include MCC for Excessive Semi-Closed Loop Error and LDM for Current Offset Error.

This alarm is issued when the absolute position data sent from the built-in α pulse coder cannot be synchronized with the phase data.

This alarm signifies incorrect serial communication with the separate serial pulse coder. It can be caused by noise (specifically if CRC or STBB occurs). If the alarm is issued continuously after power is turned on and noise measures are taken, the pulse coder, the amplifier's control board (α i series), or the pulse module (α i series) may be defective.

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.

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.

A CRC error occurred in the CNC BASIC ROM. This indicates data corruption in the Read-Only Memory module containing the CNC BASIC program, which can prevent the CNC from functioning correctly.

The Dual Check Safety function is unavailable because parameter No.1902#6 is set to 0. This disables a critical safety feature of the system, potentially reducing safety integrity.

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.

This alarm is issued when a specific condition related to the OVC bit is detected. It is generally associated with a temperature rise in the motor or amplifier, indicating a potential for overheating under current operating conditions or parameter settings.

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.

The DCS PMC detected an error in its CPU self-test function and RAM check function. This indicates a critical hardware fault within the DCS PMC unit, necessitating a power cycle to attempt to clear the alarm.

The PMC detected an error in its CPU self-test function and RAM check function. This indicates a critical hardware fault within the PMC unit, necessitating a power cycle to attempt to clear the alarm.

The DCS PMC detected an error in the system-defined safe I/O cross-check function. This indicates a discrepancy in the monitored safe I/O signals critical for safety operation, which could lead to an unsafe state. A power cycle is required.

The PMC detected an error in the system-defined safe I/O cross-check function. This indicates a discrepancy in the monitored safe I/O signals critical for safety operation, which could lead to an unsafe state. A power cycle is required.

The DCS PMC detected an error in the user-defined safe I/O cross-check function. This indicates a discrepancy in the monitored user-configured safe I/O signals, potentially affecting user-implemented safety features. A power cycle is required.

The PMC detected an error in the user-defined safe I/O cross-check function. This indicates a discrepancy in the monitored user-configured safe I/O signals, potentially affecting user-implemented safety features. A power cycle is required.

An error occurred in a CNC CPU test. This indicates a critical hardware fault within the CNC CPU, which prevents normal operation. A power cycle is required.

The CNC detected an error for the safety parameter check function. This indicates a potential issue with the integrity or validity of safety-related parameters within the CNC system, which could compromise machine safety. A power cycle is required.

The CNC detected an error in its RAM check function. This indicates a critical memory fault within the CNC, which can lead to unstable operation or data loss. A power cycle is required.

The CNC detected an abnormal condition in the execution of CNC safety functions. This indicates that critical safety routines within the CNC software are not functioning as expected, creating an unsafe operating environment. A power cycle is required.

The CNC detected a CRC check error in the CNC ROM. This indicates data corruption in the CNC's Read-Only Memory, which can prevent the system from booting or operating correctly. A power cycle is required.

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.

The CNC CPU detected that the spindle motor speed on the n-th spindle was greater than the safety speed (parameter No. 4372, 4438, 4440, or 4442) during safety monitoring (when the safety check request signal (*VLDPs) is 0). This indicates an unsafe spindle operating speed, which is a critical safety violation.

The CNC CPU detected an error in the safety parameter check function. This indicates a potential issue with the integrity or validity of safety-related parameters within the CNC system, which could compromise overall machine safety.

An error occurred in a spindle RAM test within the spindle amplifier module (SSPA). This indicates a hardware fault in the SPM unit's memory, requiring replacement of the SPM unit.

The spindle detected that the speed of the spindle motor exceeded the safety speed (parameter No. 4372/No.4438/No.4440/No.4442) during safety monitoring (when the safety check request signal (*VLDPs) is 0). This indicates an unsafe spindle operating speed, which is a critical safety violation.

The spindle detected a mismatch between the spindle amplifier connection state and its hardware setting. This alarm can be issued if the spindle amplifier configuration has been changed without corresponding software updates or if there is a wiring issue.

The spindle detected a safety parameter error. This indicates an issue with the integrity or validity of spindle safety parameters, including No.4372, No.4438, No.4440, No.4442, and No.4448, potentially compromising spindle safety functions.

The spindle detected a mismatch between the CNC result of the motor speed check and the spindle's own result. This indicates a discrepancy in speed monitoring data between the CNC and the spindle control, suggesting a potential fault in the SPM control printed-circuit board.

An error occurred in a spindle amplifier CPU test. This indicates a hardware fault within the spindle amplifier's central processing unit, requiring replacement of the SPM control board.

An error occurred in a spindle ROM CRC test. This indicates data corruption in the spindle's Read-Only Memory, which can prevent the spindle system from initializing or operating correctly.

A safety function within the spindle system was not executed as expected. This indicates a critical software or hardware issue preventing safety routines from running, compromising spindle safety.

The spindle detected a mismatch between the CNC result of the axis number check and the spindle's own result. This indicates a configuration inconsistency regarding axis numbering between the CNC and spindle, which can lead to incorrect axis control.

The spindle CPU detected a mismatch between the CNC result of the safety parameters check and the spindle's own result. This indicates an inconsistency in safety parameter values (No.4372/No.4438/No.4440/No.4442/No.4448) between the CNC and spindle, potentially affecting safety operations.

The safety functions designed to run during power-up for the spindle were not executed. This indicates a critical issue during the spindle system's initialization sequence related to safety, which could prevent safe operation.

The absolute-position detector experienced a data transfer communication error, preventing the system from obtaining the correct machine position. This issue is typically caused by a defect in the absolute-position detector, its connecting cable, or the servo interface module.

The absolute-position detector caused an overtime error during data transfer, meaning the correct machine position could not be obtained. This fault suggests a defect in the absolute-position detector, its cable, or the servo interface module.

A framing error occurred in the data transfer from the absolute-position detector, preventing the system from obtaining the correct machine position. This problem is indicative of a defect in the absolute-position detector, its cable, or the servo interface module.

A parity error was detected during data transfer from the absolute-position detector, making it impossible to obtain the correct machine position. This error points to a potential defect in the absolute-position detector, its cable, or the servo interface module.

A pulse error occurred with the absolute-position detector, preventing the system from obtaining the correct machine position. This issue is typically caused by a defect in the absolute-position detector or its connecting cable.

The amount of positional deviation overflowed, making it impossible to obtain the correct machine position. This indicates an issue with position monitoring.

The machine moved excessively, leading to an inability to obtain the correct machine position. This suggests unexpected or uncontrolled motion of the axis.

A checksum alarm occurred on the built-in Pulsecoder. This indicates an internal data integrity issue within the Pulsecoder.

An abnormal phase data alarm occurred on the built-in Pulsecoder. This suggests an issue with the phase signal generation or detection within the Pulsecoder.

A speed count abnormal alarm occurred on the built-in Pulsecoder. This indicates an issue with the revolution count data or speed detection from the Pulsecoder.

A clock alarm occurred on the built-in Pulsecoder. This points to a problem with the internal clock or timing synchronization of the Pulsecoder.

The digital servo software detected an abnormality on the built-in Pulsecoder related to its phase. This is a software-detected issue with the Pulsecoder's feedback.

The digital servo software detected abnormal data from the built-in Pulsecoder, specifically indicating a broken LED. This suggests an internal optical component failure within the Pulsecoder.

A pulse error occurred on the built-in Pulsecoder, indicating that expected pulses were not detected. This impacts the accuracy of position feedback from the internal encoder.

A count error occurred on the built-in Pulsecoder, meaning pulses were missed during counting. This directly affects the accuracy of position tracking by the internal encoder.

Communications data could not be received from the built-in Pulsecoder. This indicates a failure in the serial communication link from the internal encoder to the servo system.

A CRC error or stop bit error occurred in the communications data from the built-in Pulsecoder. This signifies data corruption or an improper termination in the serial communication from the internal encoder.

A separate detector error was reported, indicating a broken LED. This suggests an optical component failure within the external detector.

An abnormal alarm in the position data occurred on the separate linear scale. This indicates an issue with the phase signal generation or detection from the external linear scale.

A count error occurred on the separate detector, indicating that pulses were missed during counting. This directly affects the accuracy of position tracking by the external detector.

A pulse error occurred on the separate detector, indicating that expected pulses were not detected. This impacts the accuracy of position feedback from the external detector.

The digital servo software detected abnormal data on the separate detector, specifically related to its phase. This is a software-detected issue with the external detector's feedback.

Communications data could not be received from the separate detector. This indicates a failure in the serial communication link from the external detector to the servo system.

A CRC error or stop bit error occurred in the communications data from the standalone detector. This signifies data corruption or an improper termination in the serial communication from the external detector.

The servo detected that the positional deviation during stopping exceeded the parameter (No. 1839, No.1842) setting value. This indicates a failure of the axis to hold its commanded stop position within tolerance, potentially due to mechanical issues or incorrect tuning.

The servo detected that the positional deviation during traveling exceeded the parameter (No. 1838, No.1841) setting value. This indicates the axis is not accurately tracking its commanded trajectory during motion, suggesting a problem with motor power, feedback, or mechanical resistance.

The servo detected that the commanded speed on the axis exceeded the safety speed (parameter No. 13821 to 13824, No. 13826 to 13829) during safety monitoring (when the safety check request signal (*VLDVx) is 0). This suggests an unsafe operating speed was commanded or detected, posing a potential safety risk.

The servo detected that the machine position on the axis is not within the safety area (parameter No.13831 to 13838) during safety monitoring (when the safety check request signal (*VLDVx) is 0). This indicates the axis moved outside its defined safe operating envelope after the machine reference position was established, which can lead to collisions or unsafe conditions.

The servo detected an error during axis data transfer. This can occur after setting axis numbers for the servo amplifier, indicating a configuration mismatch, or it might point to an internal amplifier issue requiring replacement.

An error was detected by the servo's safety parameter check function. This indicates a potential issue with the integrity or validity of safety-related parameters within the servo system, which could compromise machine safety.

An error occurred in the servo's safety functions. This can be due to inexecution of servo software safety functions, a mismatch between servo software and CNC results for safety functions, or an error in a servo CPU or RAM test, indicating a critical safety system failure.

The MCC off Test was not completed within the time specified by parameter No. 1946. This indicates a potential issue with the MCC (Motor Contactor) contact operation, its wiring, or an inappropriately set test time.

This alarm is generated when an axis exceeds its configured safety speed limit, as monitored by the Dual Check Safety function. This occurs if the Monitoring Result signal (RSVx) for that axis is "0" and the Safety Check request signal (*VLDVx) is also "0". This condition indicates a potential overspeed situation.

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