F7453 suppression without encoder

We have vector drives and are doing speed control and only using EPOS for position tracking. We are not doing position control. We only monitor position. When an encoder fails I want to switch to encoderless mode and continue running and suppress/ignore any faults related to the encoder.

I created a second drive data set (DDS1) with p820[0]=r1407.13. This switches to DDS1 when encoder fails. I also set p2502[1]=0 (No encoder) so that position monitoring is set for No encoder in DDS1.

I set p491=5 (Encoder fault results in encoderless operation, with alarm)

The problem is that when the encoder fails I'm still getting F7453 (LR: Position actual value processing error) even though p2502[1]=0 and DDS1 is active.

How do I switch to encoderless mode and suppress any encoder faults (F7453) when encoder fails?

Thanks.