Field Wiring Of The Vt1586A - VXI VT1422A User Manual

Field Wiring of the
VT1586A
Ch0 Ch1 Ch2
Sense + Sense + Sense +
Ch0 Ch1 Ch2
Sense -
Sense - Sense -
Ch0 Ch0 Ch2
Excitation -
Excitation + Ex.Sense +
Ch4 Ch4 Ch6
Ex.Sense + Ex.Sense - Ex.Sense +
Ch4 Ch5 Ch6
Sense - Sense - Sense -
Ch4 Ch5 Ch6
Sense + Sense + Sense +
Ch16 Ch17 Ch18
Sense + Sense + Sense +
Ch16 Ch17 Ch18
Sense - Sense - Sense -
Ch16 Ch16 Ch18
Excitation + Excitation - Ex.Sense +
Ch20 Ch20 Ch22
Ex.Sense + Ex.Sense - Ex.Sense +
Ch20 Ch21 Ch22
Sense - Sense - Sense -
Ch20 Ch21 Ch22
Sense + Sense + Sense +
172 Advanced Programming with the VT1529B
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.
Ch3
Sense +
Ch3
Sense -
Ch2
Ex.Sense -
Ch6
Ex.Sense -
Ch7
Sense -
Ch7
Sense +
Ch19
Sense +
Ch19
Sense -
Ch18
Ex.Sense -
Ch22
Ex.Sense -
Ch23
Sense -
Right Side
Ch23
Sense +
Figure 5-4. VT1586A Terminal Panel Connections
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.
NOT USED
Ch8
Sense +
Ch8
Sense -
Ch8
Excitation +
Ch12
Ex.Sense +
Ch12
Sense -
Ch12
Left Side
Sense +
NOT
NOT USED USED
Ch24
Sense +
Ch24
Sense -
Ch24
Excitation +
Ch28
Ex.Sense +
Ch28
Sense -
Ch28
Sense +
Ch9 Ch10 Ch11
Sense + Sense +
Sense +
Ch10 Ch11
Ch9
Sense - Sense - Sense -
Ch10 Ch10
Ch8
Ex.Sense + Ex.Sense -
Excitation -
Ch12 Ch14 Ch14
Ex.Sense - Ex.Sense + Ex.Sense -
Ch14 Ch15
Ch13
Sense - Sense - Sense -
Ch13 Ch14 Ch15
Sense + Sense + Sense +
Ch25 Ch26 Ch27
Sense + Sense + Sense +
Ch25 Ch26 Ch27
Sense - Sense - Sense -
Ch24 Ch26 Ch26
Excitation - Ex.Sense + Ex.Sense -
Ch28 Ch30 Ch30
Ex.Sense - Ex.Sense + Ex.Sense -
Ch29 Ch30 Ch31
Sense - Sense - Sense -
Ch30 Ch31
Ch29
Sense + Sense + Sense +
Chapter 5