RIY
14
The Interface Solution Experts
Figure 6.
Differential Input Ranging Setup
5. To capture zero input value,
press (slowly) the Up
and
Down ZERO push buttons
simultaneously, twice.
NOTE
If the input value being captured
exceeds the upper or lower programmed
table limits for a particular input (refer to
table 2), the LCD will flash -HI- or -LO-,
respectively. The input value must be
within programmed table limits to be
displayed or captured.
6. Verify that voltmeter reading is 5 Vdc (equivalent
to 20 mA). This indicates that zero input value
was captured successfully. If voltmeter reads 1
Vdc (4 mA), repeat steps 4 and 5 until 5 Vdc
reading is obtained.
7. Set decade resistance box #1 to full-scale differ-
ential value as determined earlier. Do not change
resistance box #1 setting. (Refer to examples
prior to this procedure.)
8. To capture full-scale input
value, press (slowly) the Up
and
Down SPAN push
buttons simultaneously, twice.
Differential Input Ranging Procedure
1. Set range and other configuration switches for the
required RTD or ohms input range as determined
by the combined minimum and maximum values
of the intended application (refer to figure 2 and
table 2; choose from ranges R9, R10, or R11).
NOTE
Switch SW301-5 to the ‘off’ position to
perform the following procedure, and set
SW301-6 to the ‘off’ position for units
with this switch functional for keyboard
enable.
2. Connect RIY as shown in figure 6. Apply power.
3. To enter zero calibrate
mode, press the Up
and
Down ZERO push buttons
simultaneously.
4. Set both decade resistance boxes (#1 and #2) to
required zero-percent differential input to RIY.
(Refer to examples prior to this procedure.)
DECADE
RESISTANCE
BOX #2
RIY
1
2
3
4
+PS
–PS
250 ohm
+
–
DC VOLTMETER
12-42 VDC
POWER
SOURCE
+
–
DECADE
RESISTANCE
BOX #1
NOTES:
1. Notice that terminal 2 on the RIY is not used for this hookup.
2. The specifications of both decade resistance boxes must
meet or exceed those given in table 3.
ZERO
ZERO
SPAN
Содержание RIY
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