Analog encoder defective

What does Sd1 mean?

This fault indicates a problem with an analog encoder providing feedback to the drive, such as a broken wire, short circuit, or the encoder itself being faulty. By default, this critical condition triggers a full TRIP, inhibiting all ignition pulses and resetting the Ready signal, as accurate feedback is essential for stable and safe control. Manual reset is required.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check encoder output signal: Measure the analog output signal from the encoder directly to verify it's within the expected range and stable.

2. 4

   Inspect encoder mounting: Ensure the encoder is securely mounted and not damaged or misaligned.

3. 5

   Replace encoder: If wiring and power are confirmed good, the encoder itself may be faulty and require replacement.