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SCAIME Manual : NU-eNod4D-ETH-E-0418_216710-E.docx
11.2.5 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.
11.2.6 Target weight and in-flight weight
The ‘fine feed’ disabling occurs when the level (target weight – in-flight level) is crossed. 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 of the receiver.
This value can be automatically adjusted using the option ‘automatic in-flight correction’.
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:
In-flight weight = in-flight weight + (dosing result – target weight) x correction coeff. The following condition must be
verified: In-flight weight low limit < in-flight weight < in-flight weight high limit. If this condition is not verified, the
in-flight weight value is not modified.
If ‘In-flight weight low limit’ and ‘In-flight weight high limit’ are equal to zero, limit condition has not to be verified.
11.2.7 Final stabilization time
This delay time 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’ delay time begins. If the stability cannot 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 if it is acceptable.
a high tolerance (tolerance +) or tolerance in excess:
if the difference | (target weight – dosing result) | > tolerance +
where (target weight – dosing result) < 0, the ‘out of tolerances’ and ‘dosing failure’
outputs are activated.
a low tolerance (tolerance -) or tolerance in default:
if the difference | (target weight – dosing result) | > tolerance -
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.
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 elapsed after that gross measurement has become inferior to the ‘end of emptying level’.
11.2.10 End of cycle waiting time
This delay time is triggered after the 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 waiting 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 Inputs utilization
11.3.1 Start cycle
If all the starting conditions are respected (c.f. previous. § .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.
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