Encoder fault at X9

What does Sd4 mean?

This fault indicates a problem with an encoder connected to terminal X9 on the drive. This could be due to wiring issues, a faulty encoder, or mechanical damage. By default, this critical condition triggers a full TRIP, inhibiting all ignition pulses and resetting the Ready signal, as encoder feedback at this input is crucial for motor control. Manual reset is required.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check encoder output signals: If possible, use an oscilloscope to check the encoder's pulse outputs for proper waveforms.

2. 4

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

3. 5

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