VIPA HB130E SM, Manual

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Manual VIPA System 300V
Chapter 6 Analog Input Modules
HB130E - SM - Rev. 07/44 6-21
Thermocouples with compensation slot
ADU
M+
M+
M-
M-
Lo-
gic
Bus
COMP+
COMP-
L+
Comp
slot
Copper cables When connecting thermocouples with one
compensation slot, you have to regard that the
thermocouples have the same type.
The compensation slot is to be connected at
COMP+ and COMP- and is to be supplied
external.
The installation of resistance thermometers/resistors needs 4wires. Via the
connections I
C+
and I
C-
the resistance thermometer/resistor gets a constant
current. The voltage occurring at the resistor thermometer/resistor is
measured via the connections M+ and M-.
ADU
Lo-
gic
Bus
M+
I
M-
I
C-
C+
M+
I
M-
I
C-
C+
4wire
connection 3wire
connection 2wire
connection
M+
M-
I
C+
I
C-
M+: measuring line (positive)
M-: measuring line (negative)
I
C+
: constant current line (positive)
I
C-
: constant current line (negative)
By appropriate bridges on the module between M+ and I
C+
respectively M-
and I
C-
you can attach also resistance thermometers in 2- and 3wire
technique. Due to the not considered conduit length you have to count on
losses of accuracy with the result of the measurement.
At "resistance thermometers-/resistors measuring" the whole channel
group (both channels) are used. The measured value can be found at the
area of the 1
st
channel of the group. The 2
nd
channel of the group is
predefined with the overflow value "7FFFh".
Installation of
resistance
thermometers and
resistors
Channel allocation