IC697CPX928燃機(jī)卡件
如果傳感器局部接地，則：接地螺柱或穿過傳感器外殼或安裝，以避免屏幕接地回路
電纜護(hù)套只能連接在一端，即在傳感器處或在接口/中繼卡。4-20mA回路供電傳感器連接
回路供電傳感器需要雙線連接，且傳感器文檔將指示正回路連接和負(fù)回路連接，通常分別為棕色和藍(lán)色。
在現(xiàn)場電纜的系統(tǒng)57端，兩條傳感器導(dǎo)線應(yīng)：每個都連接到上的S、01或NS端子之一
連接到所需單體的現(xiàn)場接口或中繼卡頻道顯示卡。所使用的兩個端子將根據(jù)不同而不同取決于測量電阻的位置是否在回路中供應(yīng)或返回路徑。還必須在4上正確設(shè)置鏈接選項
-20mA傳感器驅(qū)動模塊（見第12.3節(jié)）。
傳感器電纜屏蔽應(yīng)連接至系統(tǒng)接地。
這可以在現(xiàn)場接口/中繼卡上使用接地端子或電纜使用金屬進(jìn)入機(jī)柜的位置或通過其它合適的方式。注：如果傳感器局部接地，則接地螺柱或通過傳感器外殼或安裝，以避免接地回路
電纜的屏蔽護(hù)套應(yīng)僅在一端連接，i、 例如在傳感器處或在接口/中繼卡處。如果傳感器局部接地，則接地螺柱或通過傳感器外殼或安裝，以避免接地回路電纜的屏蔽護(hù)套應(yīng)僅在一端連接，
i、 例如在傳感器處或在接口/中繼卡處。
4-20mA變送器連接
注意安全導(dǎo)出單通道控制卡提供的功率從直流輸入到系統(tǒng)57（18V到32V）。檢查待連接的變送器與實際電源兼容使用的電壓。來自現(xiàn)場終端的最大電流為現(xiàn)場供電的單個單通道控制卡
裝置為500mA，但是，來自所有通道不應(yīng)超過最大背板負(fù)載電流8A。
由單通道控制卡供電的變送器需要：三線或四線連接以及傳感器文檔將指示0V和+24V電源連接以及正極和
負(fù)回路連接。在現(xiàn)場電纜的系統(tǒng)57端，傳感器導(dǎo)線應(yīng)為：連接至現(xiàn)場接口上的S、01、NS、0V或24V端子或連接到所需單通道顯示器的中繼卡卡片所使用的確切終端取決于三個還是三個采用四線拓?fù)浣Y(jié)構(gòu)，對回路電流源的要求或接收器配置。還必須在4上正確設(shè)置鏈接選項-20mA傳感器驅(qū)動模塊（見第12.3節(jié)）。
傳感器電纜屏蔽應(yīng)在以下位置連接到系統(tǒng)接地：現(xiàn)場接口/繼電器卡，使用接地端子，或電纜通過金屬電纜壓蓋或其他方式進(jìn)入機(jī)柜合適的方法。
Where a sensor is earthed locally, either to
the Earth Stud or through the sensor casing
or mounting, to avoid earth loops the screen
sheath of the cable should only be connected
at one end, i.e., at the sensor or at the
Interface/Relay Card. 4 - 20mA Loop Powered Sensor Connections
Loop powered sensors require a two wire connection and the sensor
documentation will indicate the positive and negative loop connections,
usually brown and blue respectively.
At the System 57 end of the field cable the two sensor wires should
each be connected to one of either the S, 01 or NS terminals on the
Field Interface or Relay Card that is attached to the required Single
Channel Display Card. The two terminals used will vary depending
upon whether the location of the measuring resistance is in the loop
supply or return paths. Link options must also be set correctly on the 4
- 20mA Sensor Drive Module (see Section 12.3).
The sensor cable screen should be connected to the system earth.
This can be achieved at the Field Interface/Relay Card using the
GROUND terminal or where the cable enters the cabinet using a metal
cable gland, or by other suitable means.Note: Where a sensor is earthed locally, either to the Earth Stud or
through the sensor casing or mounting, to avoid earth loops the
screen sheath of the cable should only be connected at one end,
i.e., at the sensor or at the Interface/Relay Card.Where a sensor is earthed locally, either to the Earth Stud or
through the sensor casing or mounting, to avoid earth loops the
screen sheath of the cable should only be connected at one end,
i.e., at the sensor or at the Interface/Relay Card.
4 - 20mA Transmitter Connections
CAUTION
The power provided by the Single Channel Control Card is derived
from the dc input to the System 57 (18V to 32V). Check that the
transmitter to be connected is compatible with the actual supply
voltage used.
The maximum current that may be sourced from the field terminals
of an individual Single Channel Control Card to power a field
device is 500mA, however, the total current sourced from all the
channels should not exceed the maximum backplane load current
of 8A.
Transmitters powered from the Single Channel Control Card require
either three or four wire connections and the sensor documentation
will indicate the 0V and +24V power connections and the positive and
negative loop connections.
At the System 57 end of the field cable the sensor wires should be
connected to the S, 01, NS, 0V or 24V terminals on the Field Interface
or Relay Card that is attached to the required Single Channel Display
Card. The exact terminals used vary depending upon whether three or
four wire topology is used, and the requirement for loop current source
or sink configuration. Link options must also be set correctly on the 4-
20mA Sensor Drive Module (see Section 12.3).
The sensor cable screen should be connected to the system earth at
the Field Interface/Relay Card, using the GROUND terminal, or where
the cable enters the cabinet using a metal cable gland, or by other
suitable means.
