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
l
l
e
e
r
r
e
Nod3-
D
: User’s instructions
165 752-A
22/23
∗
6
: final stabilization time
∗
7
:
end of cycle waiting time
12.1 Reloading management
e
Nod3-
D
provides two mechanisms (optional) for reloading management.They allow
e
Nod3-
D
to enter a
reloading phase in case of a lack of product in the tank.
12.1.1 Reloading at the end of the cycle
An output assigned to the ‘reloading’ function is automatically set if after the result determination the
gross measurement is inferior to the ‘reloading min level’. The output remains active until the end of the
‘reloading holding time’ that begins immediately after that the ‘reloading max level’ has been exceeded.
12.1.2 Reloading at the start of the cycle
At every cycle start,
e
Nod3-
D
checks that there is enough product to reach the dosing target weight. Else
if the reloading mode is set to ‘at the start of the cycle’, an output assigned to the ‘reloading’ function is
automatically set active until the gross measurement gets superior to the ‘reloading max level’. It remains
then active during the ‘reloading holding time’.
After the reloading phase end, the dosing cycle begins normally.
12.2 Cycle description
12.2.1 Flow rate control (optional)
e
Nod3-
D
includes a flow rate control system. It makes possible to check that the flow rate during the
cycle is sufficient. The device controls that te flow rate remains equal or superior to a minimal value. If it is
not the case, an output assigned to ‘dosing failure’ or ‘flow rate failure’ is set and the cycle is suspended if
the cycle recovery option is active else it is stopped.
The flow rate control is defined by two parameters :
∗
a time interval (if = 0, the flow rate control is not used)
∗
a minimal weight variation
12.2.2 Verification of the available product quantity
At every cycle start,
e
Nod3-
D
checks that there is enough product to reach the dosing target weight. If
the gross measurement is inferior to the amount (target weight + residual weight), three different cases
can occur depending on the selected reloading mode :
none : an error is reported by an output assigned to the ‘dosing failure’ function and into a
read-only diagnostic register. The new cycle is aborted.
at the end of the cycle : an error is reported by an output assigned to the ‘dosing failure’
function and into a read-only diagnostic register. The new cycle is aborted.
at the start of the cycle :
e
Nod3-
D
starts the reloading phase (cf. §12.1.2).
12.2.3 Start delay
When the ‘start delay’ is over the reference weight acquisition is done if measurements are stable. If at
the end of the ‘motion time out’ timer, no stability can be found, the reference weight value is equal to the
gross measurement current value
12.2.4 Coarse feed effect neutralization time
This delay defined in millseconds allows to ignore the effect on the measurement signal of the coarse
feed starting. During this timer, the flow rate control and the level comparisons are inhibited.
12.2.5 Fine feed level
If the gross measurement decreasing gets superior to (target weight – fine feed level), the ‘coarse feed’
output is immediately disabled.
(
↔
reference weight – gross measurement
≥
(target weight – fine feed level ))
It is ignored if only the coarse feed is used (cf. §7.4).
12.2.6 Fine feed effect neutralization time
This delay defined in millseconds allows to ignore the effect of the coarse feed ending on the measurement
signal and especially the changing in the flow rate. During this timer, the flow rate control and the level
comparisons are inhibited.
