Operation; Load Sensing; Speed Sensing; Modes Of Operation - Milltronics ACCUMASS BW500 Instruction Manual

Operation

Load Sensing

In order for the BW500 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 BW500 is compatible with
belt scales fitted with one, two or four strain gauge type load cells. In order to function
with LVDT type load cells, an optional LVDT conditioning card is required.
Refer to Specifications on page 9, and Installation on page 13 for belt scale
requirements and connection.

Speed Sensing

In order for the BW500 to calculate rate and hence totalize material flow along the
belt conveyor, a speed signal representative of belt speed is required. For optimum
accuracy of the weighing system, 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.
Refer to Specifications on page 9 and Installation on page 13 for speed sensor
requirements and connection.

Modes of Operation

Run is the normal or reference mode of operation. It continuously processes the load
and speed signals from the belt scale to produce internal load, speed and rate
signals, which are in turn used as the basis for totalization, mA output, relay control,
and communication data. The run display is programmed (P081) to scroll through
rate, totalization (P647), load and speed; either manually by pressing the enter key,
or automatically.
R R R R R R R R a a a a a a a a t t t t t t t t e e e e e e e e
T T T T o o o o t t t t a a a a
T T T T o o o o t t t t a a a a
If the BW500 is programmed for batch control, the batch display is added to the
display scroll. Refer to Batch control
From the run mode, access to the program mode, and zero and span calibration is
made.
PL-565
R R R R R R R R a a a a a a a a
T T T T o o o o
l l l l 1 1 1 1 T T T T o o o o
l l l l 1 1 1 1
Accumass BW500
t t t t t t t t e e e e e e e e
t t t t a a a a l l l l 2 2 2 2
t t t t a a a a l l l l 2 2 2 2
L L L L o o o o a a a a d d d d
L L L L o o o o a a a a d d d d
S S S S S S S S p p p p p p p p e e e e e e e e e e e e e e e e d d d d d d d d
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