Siemens Milltronics BW500, Operating Instructions Manual

Page: 99 / 220

BW500 and BW500/L
Operating Instructions, 12/2016, A5E33482052-AD
97
Operation
8
8.1 Load Sensing
For the BW500 and BW500/L to calculate rate and 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 BW500 and BW500/L is compatible with belt scales fitted with 1,
2, 4, or 6
1)
strain gauge type load cells. To function with LVDT type sensors, an optional LVDT
conditioning card is required.
Refer to Specifications (Page 17), and Installation (Page 21) for belt scale requirements and
connection.
1)
Not available with BW500/L
8.2 Speed Sensing
For the BW500 and BW500/L to calculate rate and totalize material flow along the belt conveyor,
a speed signal representative of belt speed is required. For optimum accuracy of the weighing
system, and both constant and variable speed applications, a speed sensor is required. The
design speed (P014) and speed constant (P015) need to be programmed.
In constant speed applications (no speed sensor), the BW500 can be programmed to provide an
internal speed signal. This is achieved by entering the design speed (P014) and providing a
contact closure across speed input terminals (17/18). The speed constant (P015) defaults to
‘jumpered’. This contact should change to open when the conveyor is idle to prevent errant
totalization.
In applications with two speed sensors, the BW500 can be programmed to provide differential
speed. % slip can be calculated, using the difference between the two speed signals with
reference to the first speed.
2)
Refer to Specifications (Page 17) and Installation (Page 21) for speed sensor requirements and
connection.
2)
Differential speed detection is not available on the BW500/L.