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HA71 Digital Gas Controller
1.1.2 Bar Graphs Screen
The HA71 Bar Graphs screen shown in Figure 1-3 allows all active
channels to be viewed simultaneously. Both engineering units values
and bar graph values are indicated
in real time. Lines across the bars
indicate the alarm trip points making
it easy to identify channels at or near
alarm. A feature in the Systems menu
tree allows new alarms to always
force the LCD to the bar graphs
screen. This is useful for applications
requiring channels with alarms to be
displayed.
1.1.3 Combination Screen
The HA71 Combination screen shown in Figure 1-4 offers a view of a
single channel but displays the data as a 10 minute trend, bar graph
and large engineering units. It is also useful for testing inputs for
stability since MAX, MIN and AVERAGE values refresh each time this
%FS
Ch02 Measurement Name
MAX
10
MIN
0
AVG
3
SPAN
100
01117 COUNTS
PCTLEL
ZERO
0
03
10 MINUTES
HA71 Digital Gas Controller
Figure 1-4. Combination Screen
also be run. The numeric value shown below the bar-graph indicates
number of minutes samples have been taken. After 999 minutes the
AVERAGE buffer overflows and the error message UPDATE appears
in the AVERAGE field. Exiting this screen resets the buffer and clears
the error message.
HA71 Technical Manual
Ch01
0 PCTLEL
Ch02
10 PCTLEL
Ch03
0 PCTLEL
Ch04
50 PCTLEL
Ch05
0 PCTLEL
Ch06
0 PCTLEL
Ch07
0 PCTLEL
1
2
3
4
5
6
7
8
Ch08
0 PCTLEL
HA71 Digital Gas Controller
Figure 1-3. Bar Graphs Screen
screen is selected. For example, to
test stability over a one hour period for
an input, begin timing as soon as the
channel is selected. One hour later
record the MAX, MIN and AVERAGE
values. The difference between MAX
and MIN indicates peak to peak
excursions over the one hour period
and AVERAGE is the average for the
hour. Longer or shorter tests may
1.2 Specifications
1.2.1 DC Power Supply Requirements
Standard HA71 power requirements are 10-30VDC @ 3 watts applied
to terminals 9 & 11 of TB2 on the standard I/O PCB (see
Optional features increase power consumption as described below:
•
Discrete Relay PCB option; add 2 watts per PCB.
•
Analog Input PCB option; add 1/2 watt.
•
4-20mA Output PCB option; add 1 watt.
•
Catalytic Bead Sensor Input option; add 12 watts max (depends
upon sensor power).
•
TB2 terminals 10 & 12 of the standard I/O PCB provide a
maximum of 500mA fused output power for powering of auxiliary
external devices such as relays, lamps or transmitters. Power
consumed from these terminals should be considered when
calculating system power consumption.
1.2.2 150 Watt AC – 24VDC Power Supply
•
110-120 VAC @3.2A max
•
220-240VAC @ 1.6A max
•
A slide switch on the front of the power supply selects AC input
range.
The 10-0172 150 watt power supply
the HA71 and up to 16 detectors. A minimum of 5 watts per channel
is available for powering of external transmitters.
1-3
Section 3.0
(Section 3.1.9
) is for powering
Revision 3 (04/08)
).
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