A&D PD4000243 manual Sequential Weighing Mode, Normal Batching of Sequential Weighing

7.3. Sequential Weighing Mode

The sequential weighing mode (built-in automatic program mode) directly outputs control signals (example: medium flow valve, batch finish) without the PLC.

The sequential weighing mode can include several partial sequences like an approach sequence, mixture sequence and etc. into basic sequential weighing. The power of the control I/O signal output is too small to drive a large valve directly. Use option relay output ( OP-02 ) to drive them.

If the number of the control I/O terminals is not enough, use option parallel I/O ( OP-05 ).

Forecast Control Function

The function forecasts a timing to close the dribble flow (valve) and realizes more precision weighing. The forecast method calculates the weighing value at some points between sampling data and compares it with the dribble setpoint. The effect is equivalent to use a high speed A/D converter. The sampling rate of this indicator is 100 [times/second]. But the ratio is equivalent to 1000 [times/second], when the function is used.

Caution

If prual supplying mat is used (the recipe code is used), the mode can not use. Relation section is " 7.3.7. Automatic Selection of Supplying Mat".

Use the high speed high precision valve like a direct voltage solenoid valve. Design the mechanical valve so as to minimize the delay time.

7.3.1.Normal Batching of Sequential Weighing

Normal batch weighing weighs the material charged into the hopper.

The control gates (valves) can be used. (The full flow, medium flow and dribble flow)

Concerning Parameters of the Function

Selecting normal batching of sequential weighing.

[5q f- 1] [2] Sequential weighing

[Function] - [Function setting] - [Sequence] - [Basic] - [Weighing mode]

[5q f- 3] [0]		Normal batch weighing
		[Function] - [Function setting] - [Sequence] - [Basic] - [Loss-in weight]
Making zero display automatically when starting the sequence.
[5q	f-11]	[Function] - [Function setting] - [Sequence] - [Control] - [Batch start settings]
Preventing vibration due to gate operation.
[5q	f-33]	[Function] - [Function setting] - [Sequence] - [Timer] - [Full flow comparison
		interrupt timer]
[5q	f-34]	[Function] - [Function setting] - [Sequence] - [Timer] - [Medium flow
		comparison interrupt timer]
[5q	f-35]	[Function] - [Function setting] - [Sequence] - [Timer] - [Dribble flow

comparison interrupt timer]

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