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Idiomas disponibles
Idiomas disponibles
V7779
Function
Current drivers
Driver A input
Driver A output
Driver B input
Driver B output
A±B/2 section
A + B
output
(A + B)/2
output
A - B
output
(A - B)/2
output
Selected
output X
selected
output Y
Potentiometer
Span and zero potentiometer are connected to
the edge connector, so that they can be replaced
by ones off board.
Channel A & B zero
clockwise
Channel A & B zero
counterclockwise
Channel A
zero
wiper
Channel B
zero
wiper
Channel A & B span
clockwise
Channel A
span
counterclockwise
Channel A
span
wiper
Channel B
span
counterclockwise
Channel B
span
wiper
Wiring up
This section details how to connect the card to power supplies,
transducers and read outs.
Figure 2
Power supply
32a & c
32a & c
28a & c
Transducers
The CAH card can be used with three different types of transducers;
LVDT, full bridge or half bridge (either inductive or resistive).
Note: On the dual channel card the two transducers are given in
parallel, but their outputs go to separate demodulators.
Note: Colours of wires may vary with different manufactures. The
Colours quoted are standard for RS transducers. In all cases
the transducer lead screen may be connected to Pins 24a & c.
Figure 3
Transducer wiring
22a & c
Red
LVDT
20a & c
Blue
22a & c
Red
Full
Bridge
20a & c
Blue or Black
22a & c
Red
Half
Bridge
20a & c
18a & c Blue
Wire link
2
DIN 41612 pins
25a
27a
29a
31a
7a
9a
11a
13a
15a
15c
8a & c
10a & c
12a & c
5a
2a & c
4a & c
6a & c
1a
3a
+ 15V
Power
0V
supply
unit
-15V
Channel A Channel B
16a & c
19a
White
14a & c
Green
16a & c
19a
Yellow
14a & c
17a
Green
19a
16a & c
Yellow
14a & c
17a
Output voltages
The d.c. output voltage from the card can be read by putting a voltmeter
(either digital or analogue) between the output and 0V (Pin 30).
Figure 4
Output voltage wiring
Channel A
26
Channel B
23
Similarly, when the (A ± B)/2 facility is used, the four outputs (A + B, A
- B, (A + B)/2, (A - B)/2) can be read by connecting the voltmeter
between the appropriate output pin and 0V. All outputs can be read at
once.
To enable the use of one meter, a six way selector switch can be used:
Figure 5
(A±B)/2 wiring using single voltmeter
26 A
23 B
7 A + B
9(A + B)/2
11 A - B
13(A - B)/2
In some cases it may be desired to mount this switch on a front panel
attached to card, with the selected output from the switch wiper being
fed to a remote meter via the edge connector. For this purpose there
are two outputs pins assigned to be 'selected outputs', and the wiper of
the switch should be wired to one of these. To enable this to be done,
the appropriate pins (26, 23, 7, 9, 11 & 13) on the edge connector are
wired to pads near the edge connector so wires to the switch can be
attached.
Figure 6
15a
Voltmeter
30
Current outputs
These are provided by two current dividers, wired separately to the rest
of the card electronics. They can be looked upon as voltage to current
converters and can be operated with any of the six output voltages
mentioned above.
Figure 7
Current outputs
25a or 29a
Voltage
output
e.g.: Pin 26 a&c
The current drivers provide 2mA of output per volt input, so that ±5V on
the voltage output causes ±10mA output.
+
-
Voltmeter
30 a&c
+
-
Voltmeter
30 a&c
Voltmeter
30 a&c
CAH card
seven wires to card
Front panel
with switch
30 a&c
Current
(0 volts)
driver
27a or 31a
Current
meter
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