e
e
N
N
o
o
d
d
3
3
-
-
D
D
D
D
i
i
g
g
i
i
t
t
a
a
l
l
d
d
o
o
s
s
i
i
n
n
g
g
c
c
o
o
n
n
t
t
r
r
o
o
l
l
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Nod3-
D
: User’s instructions
165 752-A
19/23
11.2.6 Target weight and inflight weight
The ‘fine feed’ disabling occurs when the level (target weight – inflight level) is crossed. The inflight
weight value allows therefore to quantify the weight of product that carries on falling after the output
inhibition and so to avoid a systematic overoload of the receptacle.
This value can be automatically adjusted, the correction amplitude is affected by a percentage that can be
configured. It is also possible to have a stronger correction (x 3) as the result is outside the fixed
tolerances (cf. §11.2.8).
11.2.7 Final stabilization time
This timer corresponds to the minimal necessary duration for the stabilization of the weight before the
determination of the result and the control of tolerances.
When it is over, the ‘motion time out’ timer begins. If the stability can not be found within this duration, the
dosing result compared to the tolerances is equal to the last net measurement value.
11.2.8 Tolerances
The dosing result is compared to 2 limit values in order to check that it is included within an acceptable
range.
∗
a high tolerance (tolérance +) or tolerance in excess :
if the difference |(target weight – dosing result) > tolérance + |
where (target weight – dosing result) < 0, the ‘out of tolerances’ and ‘dosing failure’
outputs are activated.
∗
a low tolerance (tolérance -) or tolerance in default :
if the difference |(target weight – dosing result) > tolérance - |
where (target weight – dosing result) > 0, the ‘out of tolerances’ and ‘dosing failure’
outputs are activated. If the ‘use FF if out of low tolerance -’ is active, the fine feed is
restarted.
If the updated result is out of tolerances and if the ‘automatic inflight correction’ option is active the inflight
weight value is corrected according to the equation :
Once the dosing result is updated and compared to the tolerances an output assigned to the ‘dosing
result available’ is set. Then, the cycle ends after the ‘end of cycle waiting time’ or the emptying phase
begins.
11.2.9 End of emptying level and emptying holding time
During the emptying phase, an output assigned to the ‘emptying’ function remains active until the
‘emptying holding time’ has elpased after that gross measurement has become inferior to the ‘end of
emptying level’.
11.2.10 End of cycle waiting time
This timer is triggered after ther control of tolerances if the emptying phase is not used else it takes place
just after the ‘emptying holding time’.
11.2.11 Effective end of cycle
When the ‘end of cycle wating time’ is over, an output assigned to the ‘cycle in progress’ function is
disabled and the statistic variables (number of cycles, average value, running total and standard
deviation) are updated.
11.3 Digital inputs utilization
11.3.1 Start cycle
If all the starting conditions are respected (cf. §11.1), a rising or a falling edge (depending on the
configured logic) on this input causes a new feeding cycle to be started else an error is reported by a
‘dosing failure’ output and into a read-only diagnostic register.
11.3.2 Suspend current cycle
This input function has got two different effects :
∗
if the ‘relaunch cycle if suspended’ option is inactive : this edge-active input causes the
feeding cycle to be stopped inhibiting the different outputs involved.
inflight weight = inflight (dosing result – target correction) x correction coeff
