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.

• Broken wire or loose connection in the analog encoder cable at the drive's feedback terminals (e.g., X5).
• Short circuit within the encoder cable or the encoder itself, leading to invalid voltage/current output.
• Faulty analog encoder hardware, producing an out-of-range voltage or current signal (e.g., 0V or 22mA).
• Excessive electrical noise on the encoder feedback line disrupting the analog signal integrity.
• Incorrect scaling or input range setting for the analog input (e.g., P5-10 for input range, P5-11 for min value).

Click steps to track your progress.

1. 1

   Power off the drive and disconnect the analog encoder cable at terminal X5.

2. 2

   Measure the voltage or current output directly from the encoder at its output terminals using a multimeter while manually rotating the encoder shaft.

3. 3

   Check continuity of each conductor and shielding in the encoder cable from the encoder to drive terminal X5 using a multimeter.

4. 4

   Verify the drive's analog input configuration parameters (e.g., P5-10 for input type, P5-11 for scaling minimum) match the encoder's specifications.

5. 5

   Inspect encoder wiring for proper shielding termination at the drive and encoder ends to minimize noise pickup.