PG Disconnection (Encoder Fault)

What does PGO mean?

This fault indicates a loss or disconnection of the Pulse Generator (PG) signal, which is used for speed feedback in closed-loop control modes. It signifies that the inverter is no longer receiving reliable motor speed information from the encoder. This will prevent accurate speed control and can lead to unpredictable motor behavior if not addressed.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Verify the correct encoder type and pulse count settings in the inverter parameters.

2. 4

   Check the shielding of the encoder cable to prevent noise interference.

3. 5

   If possible, test the encoder output signals with an oscilloscope to confirm functionality.