Instruction manual

TOTALIZATION

The totalization function is based on the internal rate (mass per unit time) signal

proportional to belt speed and load on the associated belt scale. It is not affected

by the damping function (P080). The rate signal is sampled several times a second

to accurately count the mass of material conveyed. The count is held in the master

totalizer used to increment the internal totalizers and to produce a pulse signal for

the remote totalizers.

The BW100 provides four separate totalizer functions: internal totalizer 1, internal

totalizer 2, remote totalizer 1 and remote totalizer 2.

To avoid totalizing material at low flow rates, the totalizer drop out limit (P619) is set to

a percentage of the design rate. Below this limit, totalization stops. When material flow

returns to a rate above the drop out limit, totalization resumes.

Totalizer resolution or count value is set by the respective control parameters, P631 -

P639. If the resolution selected causes the totalizer to lag behind the count rate, an

E2 error is displayed after making the parameter entry. The error is rectified by

selecting a greater resolution value.

e.g.:

internal totalizer

given: P005 = 1 (t/h)

P631 = 5

then: totalizer count increments by 10 for each 10 metric tonnes registered

external totalizer

given: P005 = 1 (t/h)

P638 = 5

then: contact closure occurs once for every 10 metric tonnes registered

For remote totalization, the contact closure duration is set by the respective control

parameters, P643 and P644. The value is automatically calculated upon entry of the

design rate (P011) and remote totalizer parameters (P638 and P639), so that the

duration of contact closure allows the relay response to track the total up to the design

rate. The value can be changed to suit specific contact closure requirements, such as

in the case of programmable logic controllers. If an E2 error is displayed, P638 or

P639 has to be increased.

The totalizers are reset through the master reset (P999), the totalizer reset (P648) or

through the keypad.

» master reset: the reset of all totalizer functions is included in the master reset.

» totalizer reset: totalizer reset can be used to resets internal totalizers

1 and 2, or totalizer 2 independently.

» keypad: pressing simultaneously while in the run mode

resets internal totalizer 1, as well as the internal counts

for both remote totalizers.

Placing the internal totalizers on to the display scroll of the run mode is controlled by

the totalizer display parameter (P647); displaying either one or both totalizers.

97/07/07

OPERATION

PL-531 52