VXI VT1422A - Manual (Page 174)

172 Advanced Programming with the VT1529B Chapter 5
Field Wiring of the
VT1586A
The field wiring for the VT1586A, when used with the VT1529B, is
different from the wiring of the VT1586A when used stand-alone. In
particular, with the VT1529B option 002 VT1529B-to-VT1586A cable, the
G (Guard) terminals of the VT1586A are redefined to be the excitation
source and excitation sense terminals for the reference thermistor(s).
Figure 5-4 shows the VT1586A front panel connections. Note that the
Sense + and - terminals for the channels are the same using the VT1586A.
When using the VT1586A with the VT1529B to measure temperature,
instead of using a current source to excite the isothermal reference
thermistor, use a voltage source and a resistor divider network. The
excitation voltage supply that the VT1529B is connected to is routed
through the VT1529A-to-VT1586A cable and is made available on the four
Excitation + and - terminals on the VT1586A for use with the divider. The
recommended thermistor divider circuit is shown in Figure 5-5 and the
recommended field wiring for the divider in shown in Figure 5-6. Note that
the excitation voltage is not being connected to a measurement channel.
Instead, the same dedicated excitation measurement channel on the
VT1529B can be used that was use for strain.
Note
The Excitation Sense + and - channels shown in Figure 5-4 are normally
not used. They can be used to “wrap around” the excitation voltage outputs
on the VT1586A to the corresponding measurement channel on the
VT1529B, if necessary.
Figure 5-4. VT1586A Terminal Panel Connections
Ch16
Sense + Ch17
Sense + Ch18
Sense + Ch19
Sense +
Ch16
Sense - Ch17
Sense - Ch18
Sense - Ch19
Sense -
Ch20
Sense + Ch21
Sense +
Ch22
Sense + Ch23
Sense +
Ch20
Sense - Ch21
Sense -
Ch22
Sense - Ch23
Sense -
Ch20
Ex.Sense + Ch20
Ex.Sense -
Ch22
Ex.Sense + Ch22
Ex.Sense -
Ch16
Excitation + Ch16
Excitation - Ch18
Ex.Sense + Ch18
Ex.Sense -
Ch24
Sense + Ch25
Sense + Ch26
Sense + Ch27
Sense +
Ch24
Sense - Ch25
Sense - Ch26
Sense - Ch27
Sense -
Ch28
Sense + Ch29
Sense + Ch30
Sense + Ch31
Sense +
Ch28
Sense - Ch29
Sense - Ch30
Sense - Ch31
Sense -
Ch28
Ex.Sense + Ch28
Ex.Sense -
Ch30
Ex.Sense + Ch30
Ex.Sense -
Ch24
Excitation + Ch24
Excitation - Ch26
Ex.Sense + Ch26
Ex.Sense -
Thermistor Center Sense + Thermistor Center Sense - Thermistor Right Sense + Thermistor Right Sense - Ground Trigger
Ch0
Sense + Ch1
Sense + Ch2
Sense + Ch3
Sense +
Ch0
Sense - Ch1
Sense - Ch2
Sense - Ch3
Sense -
Ch4
Sense + Ch5
Sense + Ch6
Sense + Ch7
Sense +
Ch4
Sense - Ch5
Sense - Ch6
Sense - Ch7
Sense -
Ch4
Ex.Sense + Ch4
Ex.Sense - Ch6
Ex.Sense + Ch6
Ex.Sense -
Ch0
Excitation +
Ch0
Excitation - Ch2
Ex.Sense + Ch2
Ex.Sense -
Ch8
Sense + Ch9
Sense + Ch10
Sense + Ch11
Sense +
Ch8
Sense - Ch9
Sense - Ch10
Sense - Ch11
Sense -
Ch12
Sense + Ch13
Sense + Ch14
Sense + Ch15
Sense +
Ch12
Sense - Ch13
Sense - Ch14
Sense - Ch15
Sense -
Ch12
Ex.Sense + Ch12
Ex.Sense - Ch14
Ex.Sense + Ch14
Ex.Sense -
Ch8
Excitation + Ch8
Excitation - Ch10
Ex.Sense + Ch10
Ex.Sense -
Current Out + Current Out - Current In + Current In - Thermistor Thermistor Sense - Sense +
NOT USED
NOT
USED NOT USED
Left Side
Right Side