Operation Load Sensing In order for the BW100 to calculate rate and hence totalize material flow along the belt conveyor, a load signal representative of weight of material on the belt is required. The load signal is provided by the belt scale. The BW100 is compatible with belt scales fitted with one or two strain gauge type load cells. Refer to Specifications on page 3 and Installation/Load Cell on page 6 for belt scale requirements and connection. Speed Sensing In order for the BW100 to calculate rate and hence totalize material flow along the belt conveyor, a speed signal representative of belt speed is required.
In constant speed applications (no speed sensor), the BW100 can be programmed to provide an internal speed signal. This is achieved by entering the design speed (P014) and providing a jumper across speed input terminals (TB1-5/6). Speed constant (P015) defaults to 100. For optimum accuracy of the weighing system, both constant and variable speed applications, a speed sensor is required. Again, the design speed and speed constants need to be programmed, however the jumper across the speed input has to be removed and the speed sensor connected. Refer to Specifications on page 3 and Installation/Speed Sensor on page 6 for speed sensor requirements and connection.
Modes of Operation RUN is the normal or reference mode of operation. It continuously processes the load signal from the belt scale to produce internal load and rate signals, which are in turn used as the basis for totalization, mA output and relay control. The RUN display is programmed (P081) to scroll through rate, totalization, load and speed; either manually by pressing the ENTER key, or automatically. A bar graph is continuously displayed. It is proportional to the analog output as programmed (see Analog Output on page 43). From the RUN mode, access to the PROGRAM mode on and zero and span calibration is made.
The PROGRAM mode allows viewing and, with security permission (P000), changing parameter values. During PROGRAM, RUN mode functions are still active, i.e.: rate, relay, analog output and totalization. Error interrupts are suppressed and the bar graph is disabled. Recalibration If the PROGRAM mode is left idle for a period of ten minutes, it automatically reverts to the RUN mode. Page 42 Milltronics BW100 - INSTRUCTION MANUAL 7ML19985DJ01