Mitsubishi FR-A800 Drive Problem

[shaik habeeb alam 0]

FR-A800 VFD is in Profibus Communciation with Siemens PLC. Properly Commissioned and has been running since 6 months. But now the Drive is not following the Acceleration and decceleration time (53sec set in drive for ACC and Decc) during start , stop operation. When start PB is pressed, it is reaching setpoint within  5 to 6 seconds irrespective of Accceleration time. When Stop PB is pressed, within 5 to 6 seconds it reaches near zero and again picks up till some rpm and falls back to zero finally following decc. time.
 

[glavanov 40]

5 sec. acc/dcc is factory default parameters settings for A800

What is the led status on the Inverter panel when it's running?

[shaik habeeb alam 0]

Acceleration and decceleration Time is 53sec in Pr.7&8
Profibus LED Status is Green
MON, IM, NET status is ON.

[shaik habeeb alam 0]

FWD Led is ON.

[MarkusR 0]

Check your parameter 44 and 45 as well as your drive DIs and their assignment, maybe the second acceleration / dececeleration is active.

[shaik habeeb alam 0]

Already checked. pr45 - 9999(means it takes whatever Pr.44 value is) and when i changed the Pr.44 the drive is not stopping even after giving the group stop command, but when the rest of the drives comes to stop position then it starts deccelerating and finally coming to stop position.