Absolute value encoder initialisation error at X8

¿Qué significa Sd7 ?

The absolute value encoder at X8 has an initialisation error, is defective, or is not sending data. This may also occur if the encoder constant (C0420) for C0025=309 is altered. An uninitialised encoder can lead to uncontrolled drive movements.

• Absolute value encoder power supply (e.g., 24VDC) at X8 is missing or unstable, preventing the encoder from booting up.
• Communication link (e.g., SSI, EnDat, Hiperface) between the absolute encoder and X8 input is interrupted or shorted.
• Encoder constant (C0420) configured for C0025 = 309 (absolute encoder) is incorrect, causing a data interpretation error.
• Internal fault within the absolute encoder, preventing it from initializing or sending valid position data.
• Loose or corroded connections at the X8 terminal block or the encoder's motor-mounted connector.

Haga clic en los pasos para seguir su progreso.

1. 1

   Power off the drive, disconnect the encoder cable from X8, and measure the encoder power supply voltage at the X8 terminals with power on.

2. 2

   Inspect the absolute encoder cable for physical damage, continuity, and correct pinout for the specific communication protocol (e.g., SSI clock/data).

3. 3

   Verify parameter C0025 is set to 309 for absolute encoder, and C0420 (encoder constant) matches the encoder's specified resolution/turns.

4. 4

   Check the encoder's diagnostic LEDs (if present) for any fault indications during power-up or operation.

5. 5

   Ensure the encoder is properly mechanically mounted and aligned, as some absolute encoders require correct initial physical positioning.

6. 6

   Cycle power to the encoder and drive in sequence, then initiate an encoder re-initialization routine via the drive's keypad or software.