GWT PR 1713/00, Operating Manual, Page: 31 / 56

PR1713 Operating manual
Batching
Page 29
6.1.2.9 Restart mode
If batching is stopped by a tolerance alarm, or if a correction is possible with the weight below the
set-point, the defined restart mode determines the behaviour. A correction is possible with the batched
weight below fine switch-off point after the calming time. As a prerequisite, the tolerance test must
always be activated.
Example in restart mode 4
After the calming time, the measu-
red weight is below the low devia-
tion. A new overshoot value is
calculated. If the difference to the
set-point is higher than the
overshoot value, a correction can
be started. After waiting again un-
til the calming time has elapsed,
the weight is within the tolerance
band, but still below the set-point.
The overshoot value is corrected
again. Further correction is not
possible. With a tolerance alarm batching stops and the user has the opportunity for process interven-
tion. In this case, the process can be continued ( Go ) or aborted ( A ) .
Calculation of modified overshoot values:
Click on the required option field:
O no post-batching
⇒
mode 0
O post-batching, but no optimization
⇒
mode 1
O no post-batching, but optimization
⇒
mode 2
O post-batching first before optim.
⇒
mode 3
O optimization first before post-batch.
⇒
mode 4
Significations in the following diagrams
<T low deviation
<S weight below set-point
= set-point reached exactly
>S set-point exceeded
>T high deviation
Go entry: go on batching
A entry: abort batch
Calming time
Set-point
Overshoot
Tolerance band
New overshoot
Weight
Time
Setpoint - actual_weight
new_overshoot = old_overshoot -

2
corrected_overshoot = old_overshoot - (
Setpoint - actual_weight
)
Mode 0
=
< S < T > S > T
Batch
Tolerance alarm
Go A
Next
component
restart mode = 0:
Neither correction nor calculation of new
overshoot value