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Figure 8-10. Multiple scale inputs
(CHANS submenu) layout
SCALE
#
The channels can be selected
and processed individually or as
a total by toggling with the
SCALE # key. The red annun-
ciators for the appropriate
scales will light to indicate the
active source channel(s).
MULTIPLE SCALE INPUTS (OPTIONAL)
The standard IQ plus 800/810 has a single analog input channel. The 800
can be expanded to 2 channels, and the 810 to 2, 3, or 4. This feature is
represented by the CHANS submenu, under the SET ANALOG menu. The
parameter settings (or channel selections enabling multiple channel inputs)
are accessible from the CHANS submenu. See Figure 8-10 for layout.
XXXXXXX
SET ALG
CHANS
1
1 2
1 3
1 3 4
1 2 3 4
1 FAST
The channels can be selected and processed individually or as a total by
toggling with the SCALE # key. The red annunciators for the appropriate
scales will light to indicate the active source channels. A separate option
allows channel 1 to be selected as a high-speed channel, weighing at 100
updates per second. The indicator's power supply will support up to 32-
700 Ω load cells or 16-350 Ω load cells, all on one channel or split up
amongst multiple channels.
Notice that only the channels specified are operational with the various
multichannel setups. For example, channel 2 is not operational with the 1, 3
channel or the 1, 3, 4 channel setup.
The most common use of multiple channel weight indicators is in axle
weighing truck scales. In this application two, three, or four truck scales are
placed end to end. In a three-scale system, the front scale weighs the front
axle of the truck. The second scale weighs the drive axles of the truck, and
the third weighs the trailer axles. The IQ plus 810 indicator could display
each axle weight individually or display the sum of all scales.
It is also possible to do multiple "loss in weight" steps or filling applications
using one indicator. There are 20 setpoints available on the IQ plus 800/810.
Each set point step can be assigned to any one of the load cell input chan-
nels. The only restrictions are that the application not require high-speed
display updates and that the weights in each tank not be simultaneously
displayed. It is possible, however, to monitor two tanks at once — one
channel can be watched on the bar graph, while monitoring the other
channel on the digital display.
Optional features
8-13
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