Fanuc Series 20 CNC

This alarm typically indicates that an operation requiring the machine to be at its reference (home) position was initiated before the reference return cycle was completed. It serves as a reminder or pre-alarm that homing is required.

These alarms indicate a malfunction or failure in the absolute pulse coder (encoder) system for one or more axes. This prevents the CNC (Fanuc Series 20) from maintaining or establishing the absolute position of the axis, leading to potential loss of position data.

These alarms indicate a malfunction or failure in the absolute pulse coder (encoder) system for one or more axes. This prevents the CNC (Fanuc Series 20) from maintaining or establishing the absolute position of the axis, leading to potential loss of position data.

These alarms indicate a malfunction or failure in the absolute pulse coder (encoder) system for one or more axes. This prevents the CNC (Fanuc Series 20) from maintaining or establishing the absolute position of the axis, leading to potential loss of position data.

These alarms indicate a malfunction or failure in the absolute pulse coder (encoder) system for one or more axes. This prevents the CNC (Fanuc Series 20) from maintaining or establishing the absolute position of the axis, leading to potential loss of position data.

These alarms indicate a malfunction or failure in the absolute pulse coder (encoder) system for one or more axes. This prevents the CNC (Fanuc Series 20) from maintaining or establishing the absolute position of the axis, leading to potential loss of position data.

These alarms indicate that the backup battery for the absolute pulse coder, which maintains position data when the machine power is off, is running low. If not replaced, this will result in loss of absolute position data and require axis homing after every power cycle.

These alarms indicate that the backup battery for the absolute pulse coder, which maintains position data when the machine power is off, is running low. If not replaced, this will result in loss of absolute position data and require axis homing after every power cycle.

These alarms indicate that the backup battery for the absolute pulse coder, which maintains position data when the machine power is off, is running low. If not replaced, this will result in loss of absolute position data and require axis homing after every power cycle.

This alarm indicates an abnormal condition or communication error with a serial pulse coder (encoder) connected to the Fanuc Series 20 CNC. Serial pulse coders communicate digital position data over a serial link, and this alarm signifies a disruption or corruption of that data.

Similar to Alarm 350, this alarm indicates an abnormal condition or communication error specifically related to a serial pulse coder (encoder) on the Fanuc Series 20 CNC. It signifies a problem with the digital data transfer from the encoder to the servo system.

This alarm indicates that a servo motor or an axis connected to the Fanuc Series 20 CNC has experienced an excessive load, exceeding its continuous rating or instantaneous peak capacity, for a duration beyond the permissible limit. This can lead to motor overheating and potential damage.

This alarm indicates that the *DRDY (Drive Ready) signal from the servo amplifier has turned OFF unexpectedly. The *DRDY signal is critical for indicating that the servo amplifier is powered up, healthy, and ready to accept commands from the Fanuc Series 20 CNC. Its loss means the servo system is not operational.

These alarms (404 and 405) generally indicate a fault within the servo system that prevents proper axis operation. Without further detail, they point to an unspecified servo system abnormality affecting the Fanuc Series 20 CNC.

These alarms (404 and 405) generally indicate a fault within the servo system that prevents proper axis operation. Without further detail, they point to an unspecified servo system abnormality affecting the Fanuc Series 20 CNC.

This alarm indicates that when the servo axis is commanded to stop, its actual position deviates from the commanded position by an amount exceeding a predefined tolerance (position error limit). This suggests an inability to hold position or an unexpected disturbance while stationary.

This alarm signifies that during axis movement, the actual position of the servo motor deviates from the commanded position by an amount greater than the allowed tolerance. This indicates the servo system is struggling to follow the commanded trajectory, potentially leading to inaccurate machining or unstable operation.

This is a general alarm indicating a broad abnormality within the digital servo system of the Fanuc Series 20 CNC. It suggests a fundamental issue with the communication or control of the digital servo amplifier, possibly related to internal processing or data integrity.

This alarm indicates a loss of connection or communication failure within the servo system of the Fanuc Series 20 CNC. It specifically suggests that the digital servo amplifier has lost its communication link to the motor encoder or the CNC.

Similar to Alarm 414, this alarm indicates a general abnormality within the digital servo system of the Fanuc Series 20 CNC. It suggests an issue with the integrity of the digital control loop or communication, preventing reliable servo operation.

This alarm indicates that an overheating condition has been detected on the control side of the Fanuc Series 20 CNC, typically within the main CNC unit or one of its critical control boards. This can be caused by inadequate cooling or excessive internal heat generation, posing a risk to electronic components.

This alarm indicates that the Fanuc Series 20 CNC has detected an unacceptable fluctuation or instability in the spindle motor's rotational speed. This can lead to poor machining surface finish, tool breakage, or inefficient cutting operations.

This alarm indicates a failure in establishing the serial communication link between the Fanuc Series 20 CNC and the spindle amplifier. Without this link, the CNC cannot control the spindle, making machining operations impossible.

This is a general alarm indicating an unspecified fault within the spindle system of the Fanuc Series 20 CNC. It suggests that the spindle amplifier has detected an internal error or an abnormal condition related to the spindle motor or its operation, and has transmitted a general alarm status to the CNC.

This alarm indicates an issue with the communication or interface between the CNC (Fanuc Series 20) and an external reader/puncher device. It prevents proper data input or output operations.

This alarm indicates an issue with the communication or interface between the CNC (Fanuc Series 20) and an external reader/puncher device. It prevents proper data input or output operations.

This alarm indicates an issue with the communication or interface between the CNC (Fanuc Series 20) and an external reader/puncher device. It prevents proper data input or output operations.

This alarm indicates that the automatic reference position return (homing) operation for an axis could not be completed successfully or encountered an unexpected condition. This prevents the machine from establishing its absolute coordinate system.

This alarm indicates a parity error has been detected in the Read-Only Memory (ROM) of the Fanuc Series 20 CNC. This means that data stored in the ROM, which contains the CNC's operating system and critical programs, has become corrupted or cannot be read reliably, making the control system unstable or inoperable.

These alarms indicate a parity error has been detected in the Random Access Memory (RAM) of the Fanuc Series 20 CNC. This means that data being read from or written to RAM is corrupted, leading to unstable operation, data loss, or system crashes.

These alarms indicate a parity error has been detected in the Random Access Memory (RAM) of the Fanuc Series 20 CNC. This means that data being read from or written to RAM is corrupted, leading to unstable operation, data loss, or system crashes.

These alarms indicate a parity error has been detected in the Random Access Memory (RAM) of the Fanuc Series 20 CNC. This means that data being read from or written to RAM is corrupted, leading to unstable operation, data loss, or system crashes.

These alarms indicate a parity error has been detected in the Random Access Memory (RAM) of the Fanuc Series 20 CNC. This means that data being read from or written to RAM is corrupted, leading to unstable operation, data loss, or system crashes.

These alarms indicate either a watchdog timer error or a RAM parity error within the Fanuc Series 20 CNC. A watchdog error signifies that the CPU is not executing its regular cycle, possibly due to a program loop or freeze, while a RAM parity error indicates data corruption in memory. Both lead to system instability or halt.

These alarms indicate either a watchdog timer error or a RAM parity error within the Fanuc Series 20 CNC. A watchdog error signifies that the CPU is not executing its regular cycle, possibly due to a program loop or freeze, while a RAM parity error indicates data corruption in memory. Both lead to system instability or halt.

This alarm indicates that a servo module within the Fanuc Series 20 CNC system is either incorrectly mounted, not detected, or has a communication issue related to its physical connection. This prevents proper initialization and operation of the servo axis.

This alarm indicates a critical error within the Central Processing Unit (CPU) of the Fanuc Series 20 CNC. This signifies a severe malfunction in the CNC's core processing unit, leading to system failure and preventing any machine operation.

This alarm indicates a failure in the serial communication link between the Fanuc Series 20 CNC and the spindle amplifier. This prevents the CNC from sending commands to or receiving feedback from the spindle, resulting in an inoperable spindle.

This alarm indicates a general system error within the Programmable Machine Controller (PMC) of the Fanuc Series 20 CNC. The PMC handles the machine's ladder logic, I/O, and interlock functions, so an error here means basic machine operations, axis movement, or tool changes may be impossible.

This alarm indicates a Non-Maskable Interrupt (NMI) originating from the Base Board Controller (BOC) within the Fanuc Series 20 CNC. An NMI is a critical, high-priority interrupt that usually signals a serious hardware malfunction that the CPU cannot ignore, often leading to a system halt.

This alarm indicates a Non-Maskable Interrupt (NMI) originating from the Servo LSI Controller (SLC) within the Fanuc Series 20 CNC. The SLC is responsible for critical servo control functions, so an NMI here signifies a severe hardware malfunction in the servo control circuitry, causing the system to halt.

This alarm indicates a Non-Maskable Interrupt (NMI) originating from a board other than the BOC or SLC within the Fanuc Series 20 CNC system. This suggests a critical hardware malfunction on an auxiliary or expansion board, leading to a system halt.

This alarm indicates a Non-Maskable Interrupt (NMI) has occurred within the Fanuc Series 20 CNC, but the system could not specifically identify the source or cause of the NMI. This signifies a severe, unidentifiable hardware or fundamental software issue, leading to a system halt.