Unipulse F160 Operation Manual page 40

Discharging weighing
First supply raw material into a metering tank (hopper), then controls a weight while discharging
raw material from the metering tank.
Example of discharging weighing
In discharging weighing, the amount of discharge can be weighed by adding negative weighed
values. In this example system, raw materials are to be fed from the material tank to the weighing
tank, and a fixed quantity of raw materials are to be discharged from the weighing tank to a
container. At first, the discharge valves of the weighing tank are to be fully opened to discharge raw
materials, and the discharge valves are to be closed in the order of SP1 → SP2, and SP2 → SP3 at
the time of Final - Set Point 1, and Final - Set Point 2, respectively. The discharge valves are to be
completely closed at the time of Final - Compensation, when one measurement is completed. When
the weighing tank runs short, the feeding valves are to be opened to replenish the weighing tank
with raw materials from the material tank to weigh.
(1) The valves of the material tank are opened by the lower limit signal, and raw materials are fed
into the weighing tank.
(2) It is detected by the upper limit signal that the weighing tank is full, and the valves of the
material tank are closed.
(3) By setting external input; Tare subtraction ON, etc., Net weight is zeroed. (Tare subtraction)
(4) The discharge valves are fully opened to start discharging. When the weighed value reaches
(Final - Set Point 1), SP1 output signal turns ON. (If the comparison inhibit time is set, the timer
starts.) After the timer expires, the discharge valve (SP1) is closed to "SP2".
(5) When the weighed value reaches (Final - Set Point 2), SP2 output signal turns ON. (If the
comparison inhibit time is set, the timer starts.) After the timer expires, the discharge valve
(SP2) is closed to "SP3".
(6) When the weighed value reaches (Final - Compensation), SP3 output signal turns ON, and if
the judging time is set, the timer starts. The discharge valves are completely closed.
31
5 FUNCTIONS
Chapter
5
F160
31