Analog Value Processing
S5-115F Manual
Example:
Measuring the temperature of the busbar of a galvanic bath with a nonisolated
thermocouple. The potential of the busbar compared with the reference potential of
the module is 24 V DC (max.). A 460 analog module with floating input is used
(permissible V
CM
60 V AC / 75 V DC).
Figure 6-2.
Connecting Sensors to the 460 Analog Input Module
-
-
+
+
+
-
M -
M+
M -
M+
Equipo-
tential
bonding
conductor
V
CM
V
CM
V
I
V
I
Module
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Module
Reference bus
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Range card for four inputs
(For adapting to different input
voltages/currents
Sensor
floating
Sensor
floating
V
I
= Input voltage
M+ = Measuring input+
M-
= Measuring input-
Connecting thermocouples with compensating box
The influence of temperature on a reference junction (e.g. in a terminal box) can be offset with a
compensating box. To do this, bring the compensating box into thermal contact with the ter-
minals. For the analog input modules, a group signal line is brought out to pins 23 and 25 as input
for the compensation voltage. Use the function selection switch to set the module for compen-
sating box operation. When connecting the compensating box, please note the following:
•
The box must have a floating supply.
•
The power supply for the compensating box must have a grounded shielding winding.
Each module must have its own compensating box with its own power supply unit.
Note
If you connect a measuring point with compensating box to a reference junction, you
can use the measured input voltage to correct other measuring points through
software.
6-4
EWA 4NEB 811 6148-02
