40
SCAIME Manual : NU-eNod4D-ETH-E-0418_216710-E.docx
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 lower than the ‘reloading min level’. The output remains active until the ‘reloading max level’ has
been exceeded and during the ‘reloading holding time’.
12.1.2 Reloading at the start of the cycle
At the beginning of each cycle, eNod4-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’.
At the end of the reloading phase, the dosing cycle begins normally.
12.2 Cycle description
12.2.1 Flow rate control (optional)
eNod4-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 the 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 minimum weight variation
12.2.2 Verification of the available product quantity
At the beginning of each cycle, eNod4-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: eNod4-D starts the reloading phase (cf. previous § 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’ delay time, 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 milliseconds allows ignoring the effect on the measurement signal of the coarse feed starting.
During this delay time, 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.
12.2.6 Fine feed effect neutralization time
This delay defined in milliseconds allows ignoring the effect of the coarse feed ending on the measurement signal and
especially the changing in the flow rate. During this delay time, the flow rate control and the level comparisons are
inhibited.
12.2.7 Target weight and in-flight weight
The ‘fine feed’ disabling occurs when the gross measurement decreasing is superior to the (target weight – in-flight
weight) level.
(↔ reference weight – gross measurement ≥ (target weight – in-flight weight))
The in-flight weight value allows therefore to quantify the weight of product that carries on falling after the output
inhibition and so to avoid a systematic overload.
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.
The in-flight weight value is corrected according to the equation:
To Next Page
Loading...
