Spindle fault: Spindle speed is not stable (varies during rotation)

What does Spindle fault Case 3 mean?

The spindle's rotation speed fluctuates and is not stable during operation, affecting machining quality.

• Poor connection cables of the PPU, spindle drive, and encoder
• Spindle drive fault
• Incorrect machine data settings (MD30130, MD30240, MD30134, MD32250/MD32260)
• Loose or damaged analog spindle interface X54 or its connections
• Damaged PPU

Click steps to track your progress.

1. 1

   Check whether the connection cables of the PPU, spindle drive, and encoder are in good condition.

2. 2

   Verify the settings of machine data MD30130, MD30240 (encoder type), MD30134 (spindle output polarity), and MD32250/MD32260 (rated motor speed consistency).

3. 3

   If using an analog spindle, check interface X54 on the back of the PPU for looseness or damage, and measure voltage output on pins 1 and 9 after starting the spindle.

4. 4

   Check whether the spindle drive has a fault.

5. 5

   If the fault still exists after these inspections, professional replacement and maintenance are necessary as the PPU is likely damaged.