23 Analog input module XN-322-10AI-TEKT
23.2 Wiring
XN300 slice modules
06/16 MN050002 EN
www.eaton.com
169
Table 7:
Status LED table
23.2 Wiring
Two analog inputs can be wired to each of the five X1 to X5 connectors.
▶
Remove the KTY sensor included as standard from the bottom of the
device.
▶
Insert the thermocouple's positive pin into one of the + pins, e.g., "1+".
▶
Insert the thermocouple's negative pin into one of the - pins, e.g., "1-".
▶
Wire the KTY sensor to the cold-junction compensation reference junc-
tion. You can define a total of two reference points,
ϑ
Ref1
and
ϑ
Ref2
. Ref-
erence point
ϑ
Ref
can be defined directly on the device. In this case, the
KTY sensor should be wired directly to the device's K+ and K- pins. If
you use input wiring for the thermocouple and reference junction
ϑ
Ref
is
not directly on the connector, the KTY sensor should be wired to the
transition point between the thermocouple and the input wiring.
23.2.1 Temperature measurements using thermocouples
Measuring temperatures with thermocouples takes advantage of the ability
of cables made of different alloys to produce a voltage at their point of con-
tact (junction) as a result of their electrochemical properties. The magnitude
of this voltage will be small, non-linear, and extremely dependent on temper-
ature, making this method ideal for measuring temperatures across a wide
temperature range. The module will adjust for the corresponding non-linear-
ity, representing values in °C/10 (with one decimal place).
The term "cold-junction compensation" refers to the action of correcting the
value measured with the thermocouple by removing the error resulting from
the corresponding pin. The reason this is necessary is that when a thermo-
couple's individual lead is connected to the module connector's copper, this
will create a "parasitic" thermocouple, resulting in measuring errors and
requiring additional correction on behalf of the module. Within this context,
the KTY1 and KTY2 inputs are used to measure the temperature at precisely
the aforementioned junction (not the ambient temperature).
Module status
green
ON
System OK
OFF
No power
FLASHES (5 Hz)
No communication
User
yellow
ON
The user can set the LED signals as necessary.
(For example, the visualization interface can be used to set
the module's LED to flash so that it is easier to find the
module inside the control panel.)
OFF
FLASH
(200 ms ON,
1000 ms OFF)
FLASH
(1000 ms ON,
200 ms OFF)
Содержание XN300
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