AL01 - Overcurrent (OC):
The IPM (Intelligent Power Module) of the power unit has detected one of the following issues:

    [1] Overcurrent: There may be a short circuit in the U, V, W motor connection cables.
    [2] Overheating: The ambient temperature may have exceeded 55°C.
    [3] Gate power drop: There may be an issue with the gate power supply of the power module.

Actions to take:

    Check the motor connections (U, V, W cables may be short-circuited).
    Check the ambient temperature. If it exceeds 55°C, improve the cooling conditions.
    If the problem persists, contact authorized service.

AL02 - Overvoltage (OV):
The DC power of the main circuit has exceeded DC400 V (or DC800 V for certain models).

Possible causes:

    [1] The motor speed may have exceeded the maximum speed.
    [2] During acceleration, the axis may have overrun uncontrollably.
    [3] JP1 or JP2 connections may be broken, or the external current absorption resistor is not connected or is faulty.
    [4] The input power may exceed the device’s capacity.

Actions to take:

    Check the motor speed and speed limits.
    Check the JP1 and JP2 connections and ensure the external resistors are correctly connected.
    Ensure the input power is within the correct range.

AL03 - PN Voltage Drop (PNLV):
The DC power of the main circuit has dropped below DC170 V (or DC340 V for some models).

Possible causes:

    [1] The input power voltage may have dropped.
    [2] There may be a defect in phase T of the input power supply (for models 035P3 ~ 500P3, 400P4).
    [3] If this alarm occurs during motor acceleration, the input power capacity may be insufficient.

Actions to take:

    Check the input power voltage; it may be lower than required.
    Check whether phase T is functioning properly.
    Review the power supply capacity, especially during motor acceleration.

AL04 - Main Power Input Error (ACINF):
The voltage of the main power supply has dropped.

Possible causes:

    [1] The electrolytic capacitor may not be charging properly when the main power is turned on.
    [2] The main power may have turned off during operation.

Actions to take:

    Check the main power connections and the charging circuit. Ensure the power supply is functioning correctly.

AL05 - Charging Resistor Overheat (CROH):
The charging resistor that prevents surge current has overheated (detected only in amplifier models 320P3, 500P3, 400P4).

Actions to take:

    This error indicates a malfunction in the amplifier. Contact the manufacturer or service.

AL06 - Resolver Cable Breakage (RELV):
The resolver signal voltage (between R1 and R2) has dropped below 0.35 V.

Actions to take:

    Check if the resolver cable is broken. Measure the voltage between R1 and R2; if it is above 0.35 V, the cable is normal.

AL07 - Power Status Error (POWFAIL):
The CPU amplifier size cannot be identified.

Possible causes:

    [1] The CPU software version does not match the unit’s structure.
    [2] The amplifier may be faulty.

Actions to take:

    Check the compatibility of the software and hardware. If the problem persists, contact service.

AL08 - Servo Amplifier Overheat (SOH):
The radiator fin temperature has exceeded 90°C ~ 100°C.

Possible causes:

    [1] The temperature in the control panel may have risen.
    [2] The cooling fan in the amplifier may be faulty.

Actions to take:

    Try to reduce the panel temperature. Check if the cooling fan is working properly.

AL09 - Reverse-Current Absorption Resistor Overheat (RGOH):
The reverse-current absorption resistor has overheated, typically calculated by software.

Possible causes:

    Frequent acceleration/deceleration or continuous reverse-current load may have occurred.

Actions to take:

    Calculate the reverse-current energy, and if necessary, add an external reverse-current absorption resistor or increase the existing capacity.

AL10 - Reverse-Current Absorption Error (RGST):
The reverse-current absorption transistor has remained on for more than 100 ms.

Possible causes:

    [1] If an external resistor is not used, ensure that JP1 ~ JP2 on the terminal block are short-circuited.
    [2] If an external resistor is used, measure the resistance between PA and JP2. If the resistance is at the recommended value, there is no problem. However, if it exceeds the recommended value, a wire in the resistor may have broken, in which case the resistor should be replaced.

Actions to take:

    Check the terminal connections. Measure the resistance according to the recommended value, and if necessary, replace the resistor.