e
Nod3-
C
Digital Transmitter
e
Nod3-
C
:
User’s instructions
NU-eNod3C-E-0911_165702-I
20/22
11.4 Dynamic zero
If an input assigned to the
‘dynamic zero’
function is activated or if a
‘dynamic zero’
command is
received,
e
Nod3-
C
calculates the measurement average value during a configurable time. This
value becomes effective if it is within a ± 10% range of the specified maximum capacity or
±
2% in
legal for trade application. Stability is not required.
11.5 Checkweigher zero automatic correction
e
Nod3-
C
also provides an automatic zero tracking for dynamic applications. It allows to follow the
evolution of the zero in checkweigher functioning mode, for example on a conveyor belt on which
there is some product accumulation
This function is efficient only when the measured signal is filtered enough with few noise and
oscillations.
When this function is enabled, an average value is calculated if comprised within a configurable
interval around the zero calibration and during a configurable period. Some other criteria are also
taken in account, they are:
- Number of measurements complying with correction range compared with
total number of measurements received during dynamic acquisition time, it
must be > 75%.
-
At least 10 measurements included in the interval are necessary.
In legal for trade application:
-
The interval cannot exceed
±
5d
-
The dynamic acquisition time is 1 second minimum
- Checkweigher zero automatic correction is disabled if measurements are
stable.
Recommendations:
- To avoid undesired zero correction, preferably set zero automatic correction
only when weighing belt is in use.
- Dynamic acquisition time should be higher or equal to checkweigher
measuring time.
- Dynamic acquisition time should be lower than free time between two
measurements.
- Interval of the zero automatic correction should be lower than checkweigher
trigger level.
-
Interval of the zero automatic correction should be in correspondence with the
variation interval due to mechanical motion. The value should be lower than
10d.
