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3.2 TARE
Function : Digital zero setting of the gross weight value with 0.1 scale division
accuracy. Allowed within the complete weighing range.
Taring : With tare command: X ! N CR (= set net), or built in into a setpoint
executive code. See table 7, 2
e
column on page 45.
If a tare is in operation, i.e. the weight reading is net, the gross weight value
always may be requested with: X ? G CR , the tare will not be deleted.
A tare is cancelled with command: X ! G CR (set gross)
3.3 DAMPING / FILTERS
Standard filter : Digital two pole filter from 0.13 Hz up to 4.02 Hz in 8 steps. Setting by
dil-switches 49 . . 52 on the main print board, see table 2 on page 40.
Adaptive filter : This progressive filter damps down the weight movements automatically with
more force as the weight movement tends to decrease.
This results in a major improvement of the time necessary for achieving a
“standstill” and prevents for blinking up and down of the weight reading.
The increased filtering of the adaptive filter is switched off immediately
if more than ½ scale division change in the weight value is measured longer
than ½ second. Pulsating changes however are neglected by integrating
calculation of the weight values.
The adaptive filter is default “on”, but may be disabled with command : ! E 3
(off), and reset with : ! E 2 (on).
Anti pulse filter : Effective only for the weight values sent to the setpoint comparator.
Pulsating weight changes are recalculated, based upon the steepness of the
pulse and the remaining increase of weight after a pulse. In this way the
kinetic energy of the pulse will be levelled, resulting in a correct weight value
that is used by the setpoint comparator.
Short “overshoots” of the measured weight value is strongly prevented by this
filteren, premature switching off of the setpoints is prevented.
The anti pulse filter is switched on with the start command code of the
setpoints, see table 8, last column on page 46.
Inflight filter : Effective only for the weight values sent to the setpoint comparator. This filter
measures continuously (426 x per second) the speed of the weight increase.
From the derivatives of these range of measured values, it calculates the
kinetic energy, pushing on the scale. The weight value of this energy is added
to the actual value, causing a premature cut off of the setpoints.
In this way course filling may last longer, and fine dosing time will be shorter,
since overshoot risk is strongly limited, it will speed up the capacity of filling.
The anti pulse filter system is incorporated in the inflight filter.
Since these filters are measuring continuously at high speed, a change in
weigh speed immediately will result in correction of the setpoint cut off values.
The inflight filter is switched on with the start command code of the
setpoints, see table 8, last column on page 46.
.
Manual 348-2 V 3.1 Page 11 01-06-2007
11


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