Absolute Encoder EnDat Internal Fault/Error

What does F31111 mean?

The EnDat absolute encoder has detected an internal fault, indicated by set bits in its fault word (r0949). This can include failures such as the lighting system, low signal amplitude, incorrect position values, or issues with the 5V encoder power supply (overvoltage, undervoltage, overcurrent). If the encoder has battery backup, a low battery condition can also trigger this fault. This critical error affects position feedback accuracy and can lead to unreliable drive operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If the fault points to lighting system failure, low signal amplitude, incorrect position values, or internal overcurrent (bits 0, 1, 2, 5), the encoder unit is defective and must be replaced. For motor encoders with a direct DRIVE-CLiQ socket, this may require replacing the entire motor.

2. 4

   If the encoder has battery backup and Bit 6 is set, replace the encoder battery immediately.