1. FANUC Servo Amplifier Alarm Codes and Troubleshooting Methods
1.1 SV0430 Servo Motor Overheating
Reason for alarm: The servo motor temperature is too high.
Troubleshooting methods:
1) Troubleshoot parameter problems, and please re-initialize the servo motor. It is best to confirm carefully by referring to the parameter list.
2) Check diagnosis No. 308 to see if the actual temperature is too high. You can use hand touch to check. If the actual temperature is not high, please check the hardware.
3) If the actual temperature is basically consistent with the diagnostic data, please check the cause of the motor temperature being too high. When checking the hardware, you can troubleshoot by replacing the encoder, motor, feedback cable, and amplifier.
4) The alarm can be shielded in a short period of time through parameter P2300#7.
1.2 SV431 PSM Overheating or β Series SVU Overheating
Reason for alarm: The servo amplifier or power supply overheats.
Troubleshooting methods:
1) Please check the amplifier wiring. Especially when using the analog servo adapter, the ALM signal needs to be connected to 0.
2) Check the motor parameters.
3) Replace the amplifier.
1.3 SV0432 Control Power Supply Voltage Has Dropped
Cause of alarm: Servo amplifier or power supply voltage drops.
Troubleshooting methods:
1) Check the short circuit of the amplifier to see if there is a poor connection.
2) Check whether the input voltage of the amplifier meets the requirements.
3) Check whether the current of the switching power supply, transformer, etc. is sufficient.
4) Replace the amplifier.
1.4 SV0433 Low DC Link Voltage
Reason for alarm: PSM DC link voltage drops, or DC link voltage of α, β series SVU drops.
Troubleshooting methods:
1) Measure whether the actual power voltage is lower than the required voltage range.
2) Detect whether there is an emergency stop disconnection, but the strong current is not connected due to abnormalities in the air switch, contactor, etc.
3) This alarm may appear following alarms such as SV0364, so solve other alarms first.
1.5 SV0434 Control Power Supply Voltage Has Dropped
Reason for alarm: The amplifier control power supply voltage is lower than the required.
Troubleshooting methods: Measure the control power supply voltage and investigate the cause that the peripheral control circuit makes the voltage drop.
1.6 SV0435 DC LINK Low Voltage
Cause of alarm: DC LINK voltage of servo amplifier has dropped.
Troubleshooting methods:
1) First check whether the wiring pins on the amplifier are connected incorrectly and whether the cables are in good condition.
2) Troubleshoot the problem with the amplifier itself.
1.7 SV0436 Soft Overheating Relay Alarm (OVC)
Reason for alarm: The digital servo software has detected software overheating (OVC).
Troubleshooting methods:
1) Check the inherent parameters of the motor.
2) Check whether the motor brake coil is working normally.
3) Check the motor power line and feedback line.
4) Increase the time constants such as parameters P1620 and P1621.
5) Adjust the machinery or calculate the size of the motor to investigate the cause of excessive load.
1.8 SV0437 Input Circuit Overcurrent
Reason for alarm: There is overcurrent flowing into the input circuit of the power supply.
Troubleshooting methods:
1) Unplug and replug the amplifier side panel.
2) Replace the amplifier side panel.
1.9 SV0438 Abnormal Current
Reason for alarm: The motor current is too large.
Troubleshooting methods:
1) This alarm may occur in abnormal processing conditions. Troubleshoot the abnormal condition by shutting down and restarting the amplifier.
2) Check whether the power voltage exceeds the amplifier specification range.
3) There are problems with the motor power line phase sequence and cables.
4) Check the actual current situation and use SERVO GUIDE software to detect the IEFF curve value of the alarm motor.
5) Set parameter P2209#4.
1.10 SV0439 Too High DC Link Voltage
Reason for alarm: Servo amplifier or power supply voltage is too high.
Troubleshooting methods:
1) Please check the amplifier voltage.
2) Unplug and replug the amplifier side panel.
3) Replace the amplifier.
1.11 SV0440 Too Large Deceleration Power
Reason for alarm: The regenerative discharge amount of the power supply or the servo amplifier is too large, and the regenerative discharge circuit is abnormal.
Troubleshooting methods:
1) If the regeneration resistor is not configured, please short-circuit pins 1 and 2 of CXA20 and RC and RI of CZ6.
2) If the regeneration resistor is not configured, and at the same time, the operation mentioned in 1) has been completed and confirmed to be normal, for temporary use please reduce the moving speed, and for normal use please contact FANUC to configure the discharge resistor.
3) If a regenerative discharge resistor is configured, please check the discharge resistor wiring (CXA20, CZ6).
4) If a regenerative discharge resistor is configured and the wiring is confirmed to be normal, please contact FANUC to confirm whether the discharge resistor is sufficient.
1.12 SV441 Abnormal Current Offset
Reason for alarm: The digital servo software detected an abnormality in the motor current detection circuit.
Troubleshooting methods: The amplifier hardware is damaged, please repair and replace it.
1.13 SV0442 DC LINK Charging Abnormality
Reason for alarm: The backup discharge circuit of PSM DC link is abnormal.
Troubleshooting methods:
1) First confirm that after the emergency stop releases electrical contacts, the power supply must be provided to the amplifier immediately with sufficient voltage.
2) Confirm whether the phase sequence of CX48 is consistent with the power supply of the amplifier.
3) Check whether there are any problems with other wiring related to the power supply.
4) Replace the amplifier for troubleshooting.
1.14 SV0443 Cooling Fan Failure
Reason for alarm: Amplifier internal fan failure.
Troubleshooting methods:
1) Install the amplifier internal cooling fan if it is not installed.
2) If the internal fan fails, please replace it.
1.15 SV0444 Cooling Fan Failure
Cause of alarm: Failure of the fan inside the servo amplifier.
Troubleshooting methods: Please replace the fan.
1.16 SV0445 Soft Disconnect Alarm
Reason for alarm: The digital servo software detects that the pulse encoder has been disconnected.
Troubleshooting methods:
1) Check the parameters and set P2003=1, P2064=256.
2) If it is still invalid after completing the settings of 1), please check whether the hardware feedback line is disconnected or subject to electromagnetic interference.
3) Check whether the fully closed-loop encoder is damaged or has installation problems.
1.17 SV0446 Hard Disconnect Alarm
Reason for alarm: The built-in pulse coder is detected to be disconnected through hardware.
Troubleshooting methods:
1) Check whether the motor feedback line is broken.
2) Check whether the third-party fully closed-loop encoder is damaged or has installation problems.
1.18 SV0447 Hard Disconnect (EXT)
Reason for alarm: The external separate detector is detected to be disconnected through hardware.
Troubleshooting methods:
1) Check the parameters and set P2003=1, P2064=256.
2) If it is still invalid after completing the settings of 1), please check whether the hardware feedback line is disconnected or subject to electromagnetic interference.
3) Check whether the fully closed-loop encoder is damaged or has installation problems.
1.19 SV0448 Unmatched Feedback Alarm
Reason for alarm: The data sign fed back from the built-in pulse encoder is opposite to that fed back from the external detector.
Troubleshooting methods:
1) Switch parameter setting P2018#0.
2) Check whether the third-party encoder is subject to strong magnetic interference.
1.20 SV0449 IPM Alarm
Reason for alarm: The servo amplifier IPM (intelligent power module) detected an alarm.
Troubleshooting methods:
1) If it happens accidentally, please check whether the amplifier wiring is connected well.
2) If the amplifier IPM module is damaged, please repair or replace it.
