BERTHOLD TECHNOLOGIES LB 567, Руководство пользователя

Страница: 20 / 186

Chapter 3. System Description
20 MicroPolar 2 (++) LB 567
3.4.3 Weight/Throughput Compensation
If the material cross-section is rectangular (see Figure 3-3), the
weight per area [g/cm²] is proportional to the weight per length
[kg/m]. Thus, the load compensation becomes linear; it is calcu-
lated as follows:
Load = Weight [kg] Eq. 3-7
The 0(4)...20 mA signal is supplied by an existing weighing sys-
tem.
If the weighing system supplies a throughput signal (T/h), either
the conveyor belt speed must be constant, or the belt speed must
be fed as into the evaluation unit 0(4)…20 mA signal via the sec-
ond current input. The compensation is then calculated according
to:
Load=
Throughput [T/h]
Belt speed [m/s]
Eq. 3-8
IMPORTANT
The throughput signal must be fed in via current input 1 and the
speed signal via current input 2.
Figure 3-3:
Rectangular
material cross-section
with weighing system