LoadCell - Special

The Loadcell Program configures parameters of the Loadcell modules including WG02A, WG04A, WG02C, WG02D and WG02E.

Registering the Loadcell program
Select [File] ->[New Program] -> [Loadcell] program

Open

Enter the Program Name, Program ID and Program Free Space (OnlineEdit Buffer).
Click the [OK] button.

Configuring the Loadcell program

Open

Weighing Mode: The Loadcell modules provide 8 different operating modes.

Indicator mode: is the simplest operating mode, provides the measured weight only and has no control functionality.

Automatic normal batching: A batch is weighed automatically by controlling the full flow and dribble flow signals. The batch control is started by ‘Start (Y2/3/4/5) signal or "WGBATCH" instruction.
The batching data must firstly be configured by this special program (Loadcell) or written into the shared memory area of WG0nA module by sequence program.

Automatic loss in weight batching: A batch is weighed by measuring the loss in weight as the material is discharged from the weighing hopper.
The batch control is started by ‘Start (Y2/3/4/5)’ signal or "WGBATCH" instruction. Also, this batch needs ‘Tare (YA/B/C/D)’ input from sequence program during the progress.

User controlled normal batching: This mode performs normal batch weighing but the comparator output is dependent only on the current weight data.
This mode, while being more flexible than the automatic mode, is more difficult to implement as the full flow and dribble flow signals must be turned off
by a sequence program before the hopper is discharged. No compensation is performed.

User controlled loss in weight batching: This mode performs loss in weight batching but the comparator output is dependent only on the net weight data.
This mode, while being more flexible than the automatic mode described in section "Automatic Loss in Weight Batch", is more difficult to implement.
No compensation is performed in this mode. After starting of this mode, the batching signal (X6/7/8/9) is turned on until when the WGSTOP instruction or
‘Batch Stop’ command (code 3) with Y2/3/4/5 signal is issued by sequence program.

Comparator mode: This mode performs only comparison between set values and net weight.

Weight sorting: This mode gets 7 different boundaries (set values) for classifying the 8 different ranges of weight. Each 8 ranges have their output bits in control outputs (offset 3, 18, 33, 48). At any time, only one bit of control outputs is set according to the currently measured net weight.

Dynamic batching(fluid): This dynamic weighing batch program is supported by WG02D model only. WG02D model is specially turned for weighing fluid objects such as eggs,
filled bottles and etc. at high speed (typical speed: 0.5 sec). Measured weight of fluid object has a special characteristic that series of measured values have wave pattern.
A measuring idea can be suggested by this characteristic. Actual weight of the object would be located at the middle point of minimum and maximum wave cycle approximately.

Max. Weight: Maximum weight that the Loadcell can measure.

Min. Scale: Sets the display digit span value. If set value was ‘5’, measured weight will be displayed as 0, 5, 10, and 15 …so on.

Near Zero Range: If current measured weight is within the valid set range (within 1% of Max. Weight), the zero signal will be turned on.

Digital Filter Constant: Valid set value (%) is 0-90%. WG0nA module has a digital filter for removing the noise from Loadcell output signal.

Average Window Size and Time: The weight data that can be used in batch control and sequence program is the average of a number of AD samples.
This parameter sets the number of samples for the average and the sampling time between each sampled data. The number of samples used does
not affect the update rate of the weight data because the average is a ‘moving window’ type. If the set value is zero, the averaging function will not be activated.

Stable Range and Time: Valid set range is within 1% of Max. Weight while valid set time (unit of 100 msec) is 1 – 100 (100msec – 10,000msec).
A weight which does not change within the specified range for the time specified is considered to be stable and the stable output will be set to ON. If one of these set values is zero, the stable detect function will not be activated.

Auto Zero Range: Valid set range is within 1% of Max. Weight while valid set time (unit of 100 msec) is 1 – 100 (100msec – 10,000msec).
The auto zero function removes the zero drift in the system by periodically re-zeroing the measured weight when it is near zero. The auto zero range
is the maximum zero shift that will be corrected and the time period is the minimum time between corrections. If the measured weight shifts from zero
to a value outside the auto zero range (within the zero time period) the weight will not be re-zeroed. If one of these set values is zero, the auto zero function will not be activated.

Hysteresis Range and Time: Valid set range is within 1% of Max. Weight while valid set time (unit of 100 msec) is 1 – 100 (100msec – 10,000msec).
The hysteresis function suppresses flicker of the measured weight data. If the weight changes within the range specified and returns to the previous value within the time limit specified,
the measured weight data will not be affected. If one of these set values is zero, the hysteresis function will not be activated.