8441

Category: Alarm

Cause

1. Excessive main circuit input voltage
2. The power supply is unstable or has been affected by lightning
3. Braking resistor failure
4. The external braking resistance is too high to absorb braking energy quickly
5. The motor accelerates and decelerates rapidly, and maximum braking energy exceeds the absorbable value
6. Large deviation in the sampled DC bus voltage
7. Servo drive fault

Corrective action

1. Check the drive input power specifications and measure whether the input voltage at the drive side (R S T) of the main circuit cable meets the following specifications: ◆220V drive: RMS value: 220V-240V; permissible deviation: -10%+10%(198V264V). ◆380V drive: RMS value: 380V-440V; permissible deviation: -10%+10%(342V484V). Replace or adjust the power supply to meet the specifications.
2. Monitor whether the drive input power supply has been affected by lightning, and measure whether it is stable and meets the above specifications. Connect a surge suppressor, then turn on the control power and main circuit power again. If the fault still occurs, replace the servo drive.
3. If the built-in braking resistor is used (2002-1Ah=0), confirm that P and D are securely connected by a wire; if so, measure the resistance between C and D. If an external braking resistor is used (2002-1Ah=1/2), measure its resistance between P and C. For braking resistor specifications, see 1.1.4 Braking resistor specifications. ◆If the resistance is ∞ (infinity), the braking resistor has an internal open circuit: ◆If the built-in braking resistor is used, change to an external braking resistor (2002-1Ah=1/2) and remove the wire between P and D. The resistance and power rating may be the same as those of the built-in braking resistor. ◆If an external braking resistor is used, replace it with a new resistor and reconnect it between P and C. Be sure to set 2002-1Bh (external braking resistor power) and 2002-1Ch (external braking resistance) to match the actual external braking resistor parameters.
4. Measure the external braking resistance between P and C and compare it with the recommended value. Replace the external braking resistor with the recommended resistance and reconnect it between P and C. Be sure to set 2002-1Bh (external braking resistor power) and 2002-1Ch (external braking resistance) to match the actual external braking resistor parameters.
5. Confirm the acceleration/deceleration times during operation. Measure the DC bus voltage between P and N and check whether it exceeds the fault threshold during deceleration. First ensure the main circuit input voltage is within specification, then increase the acceleration/deceleration times if permitted.
6. Observe whether parameter 200B-1Bh (DC bus voltage) is in the following range: 220V drive: 200B-1Bh ＞420V; 380V drive: 200B-1Bh＞ 760V. Measure whether the DC bus voltage between P and N is normal and less than 200B-1Bh. Consult our technical support.
7. If the fault is still reported after repeatedly turning off power and reconnecting the main circuit power, replace the servo drive.