Encoder error at X9

What does Sd3 mean?

The encoder cable connected to X9 is interrupted, or pin X9/8 is not connected (input signal 'Lamp Control' at X9/8 is LOW). This leads to a loss of encoder feedback, which can cause uncontrolled drive movements if not addressed.

• Open circuit or high resistance in the encoder power supply lines (e.g., +24VDC to X9/1, GND to X9/2) preventing encoder operation.
• Interruption or short circuit in the encoder A/B/Z signal lines (e.g., X9/3, X9/4, X9/5) causing loss of position/speed feedback.
• Unconnected or incorrectly wired X9/8 (Lamp Control input) which is configured as a mandatory safety or enable signal (e.g., C0024 = 1).
• Damaged incremental encoder sensor within the motor or external mounting, leading to no pulse output.
• Electromagnetic interference on the encoder feedback cable due to improper shielding or routing alongside power cables.

Click steps to track your progress.

1. 1

   Power off the drive, disconnect the encoder cable from X9, and measure +24VDC and GND pins (X9/1, X9/2) for voltage with power on.

2. 2

   Use a multimeter to check for continuity of each individual wire in the encoder cable, including signal lines (X9/3, X9/4, X9/5) and X9/8.

3. 3

   Verify that pin X9/8 is correctly wired according to the application (e.g., connected to +24VDC if configured as an enable, or to a specific digital output).

4. 4

   Inspect the encoder cable for physical damage, sharp bends, or loose connections at X9 terminal block and motor connector.

5. 5

   Using an oscilloscope, monitor encoder A, B, and Z signals (X9/3, X9/4, X9/5) while rotating the motor slowly to verify pulse generation.

6. 6

   Check parameter C0024 to ensure the 'Lamp Control' input functionality on X9/8 is correctly configured for the application or disabled if not used.