@ Uplinker
Sorry for that offense. Had a bad day. I have removed my misbehavior now.
"HYD PTU" Memo:
I did not find any delay in the ECAM system logic Data so the memo should come as soon as the PTU starts. But it did not find any description how long it stay.
If there is only a low demand on pressure due to lack of F/CTL movement the MEMO would cycle is there is no delay of fade out. I assume there is a light delay for the fade out.
I do not think that the system accumulator can force this behavior. The system accumulator covers the time of hydraulic pressure demand to the time the EDP response. The accumulator also smoothen the output from the EDP.