The fiberline is now operating stable at the minimum rate. The pulp production rate
may be increased, and the flow to the press also. At some point, the consistency set
point should be increased (line No.3) to the normal operating target inside area “A”.
The flow controller will vary the feed to the press (line No.4) to maintain normal
control of the feed tank.
For most operating conditions, these two areas graphically depict the widest range of
control, while using only two consistency setpoints. Area “B” is for low rates, and
area “A” is normal operation for the majority of the operating time.
During upset conditions or when slowing to stop, the operator may choose the amount
of controller automation and targets to stay within the larger box. The press will
behave more predictably if feed flow and consistency are not changed too quickly