Integral Track in Provox

[comcon]

Using SRx family controllers,

I've modified a relatively complex multi-cascade boiler control
scheme.

As FSTs perform calculations on most signals between controllers, the
built in anti-windup isn't available.

I created what I thought was a robust anti-windup scheme, where when
all downsteam elements are limited in a certain direction, either
setpoint or output, and the PV/SP error was such that integral action
would move the upsteam controller into the direction of the limit, I
would enable the integral track flag.

What happens though is that every time I turn on integral track, the
controller bumps.

I didn't see it in any documentation, but I assumed that Provox would
"debump" when entering Integral track.

If I'm to perform my own "debump"... I would presume I would have to
know the value of the PID controller integral term, which is not
available.

I've tried writing to MV[3] and % MV[3]... tried writing floats, and
percent values.

Any ideas on why I'm seeing this bumping (sometimes large, sometimes
small)

... or how to get around it?