DC Link Fuse Blown

What does SP0003 mean?

The DC link fuse on the spindle amplifier is blown, indicating an overcurrent event or a short circuit in the DC bus. This results in complete loss of power to the motor.

• Short circuit in the spindle motor windings or power cables.
• Faulty spindle amplifier output stage (e.g., IGBT failure).
• Overvoltage on the DC link causing excessive current draw.
• Ground fault within the spindle motor or cabling.
• Incorrect fuse rating or counterfeit fuse installed.

Click steps to track your progress.

1. 1

   Measure the resistance between each motor phase (U, V, W) and ground.

2. 2

   Visually inspect the motor power cables for insulation damage.

3. 3

   Measure the DC link voltage (terminals P+, P-) under load.

4. 4

   Check the integrity of the spindle amplifier's internal DC bus capacitors.

5. 5

   Verify the rating of the installed DC link fuse matches the amplifier specification.