HE693ADC410A燃機(jī)電氣模塊
傳感器連接13.1概述
警告?zhèn)鞲衅鲗?dǎo)線連接不正確可能會(huì)導(dǎo)致以下部件損壞：傳感器和系統(tǒng)57兩者。
注意安全傳感器必須始終與系統(tǒng)連接57機(jī)組處于無(wú)動(dòng)力狀態(tài)。在其處隔離電源建立連接前的源代碼。
確保所有外部直流備用電池電源也殘廢重要的
為了確保系統(tǒng)的正確運(yùn)行，以及滿(mǎn)足歐洲RFI和EMC標(biāo)準(zhǔn)，所有傳感器領(lǐng)域電纜必須屏蔽。每個(gè)傳感器的電纜屏蔽應(yīng)連接至機(jī)柜保護(hù)接地。根據(jù)傳感器的操作，將電纜連接到傳感器并將現(xiàn)場(chǎng)電纜敷設(shè)回System 57裝置。這個(gè)傳感器電纜應(yīng)遠(yuǎn)離干擾源如交流電力電纜、電機(jī)、機(jī)械等。
使用隨裝置提供的配置表上的信息以決定將哪個(gè)傳感器連接到每個(gè)通道。以下章節(jié)描述了催化和4-20mA的傳感器連接輸入單通道控制卡。
13.2催化傳感器連接
催化傳感器需要三線連接和傳感器文件將顯示三個(gè)連接S、01和NS，它們是通常分別為棕色、白色和藍(lán)色。此外，SensePoint可燃ppm版本還具有屏幕連接。
在現(xiàn)場(chǎng)電纜的系統(tǒng)57端，三根傳感器導(dǎo)線應(yīng)每個(gè)都連接到相應(yīng)的匹配S、01或NS端子連接到所需單體的現(xiàn)場(chǎng)接口或中繼卡
頻道顯示卡傳感器電纜屏蔽或鋼絲鎧裝（或編織物），
應(yīng)連接到系統(tǒng)（保護(hù)）接地。這可能是通過(guò)使用金屬電纜，在電纜進(jìn)入機(jī)柜的位置實(shí)現(xiàn)
壓蓋，或通過(guò)其他合適的方式，并避免任何篩網(wǎng)“尾部”在機(jī)柜內(nèi)。
其中電纜由單獨(dú)的屏蔽、護(hù)套和電線組成鎧裝（或編織），鎧裝應(yīng)在機(jī)柜處連接
應(yīng)連接到保護(hù)接地和屏蔽護(hù)套的入口至現(xiàn)場(chǎng)接口/繼電器卡的接地端子或至適用于儀器接地點(diǎn)。
可燃物傳感器、接線盒和接線盒連接
注：如果傳感器局部接地，則接地螺柱或通過(guò)傳感器外殼接地或安裝，為避免接地回路，電纜的屏蔽護(hù)套應(yīng)僅為連接在一端，即在傳感器處或在接口/中繼卡處。
SENSOR CONNECTIONS
13.1 General
WARNING
Incorrect connection of the sensor wires may cause damage to
both the sensor and System 57.
CAUTION
The sensors connections must always be made with the System
57 unit in an unpowered state. Isolate power supplies at their
source before making connections.
Ensure that any external dc backup battery supply is also
disabled.
IMPORTANT
In order to ensure the correct operation of the system and to
meet European Standards for RFI and EMC, all sensor field
cables must be screened. The cable screen of each sensor
should be connected to the cabinet protective earth.
Connect the cabling to sensors in accordance with the Sensor Operating
Instructions and run the field cables back to the System 57 unit. The
sensor cables should be routed away from sources of interference
such as ac power cables, motors, machinery etc.
Use the information on the configuration sheet provided with the unit
to decide which sensor to connect to each channel. The following
sections describe the sensor connections for the Catalytic and 4 - 20mA
input Single Channel Control Cards.
13.2 Catalytic Sensor Connections
Catalytic sensors require a three wire connection and the sensor
documentation will indicate three connections S, 01 and NS, which are
usually brown, white and blue respectively. In addition, the SensePoint
combustible ppm version also has a screen connection.
At the System 57 end of the field cable, the three sensor wires should
each be connected to the respective matching S, 01 or NS terminal on
the Field Interface or Relay Card that is attached to the required Single
Channel Display Card
The sensor cable screen or steel wire armour (or braid), as appropriate,
should be connected to the system (protective) earth. This can be
achieved where the cable enters the cabinet by using a metal cable
gland, or by other suitable means, and avoiding any screen 'tails'
within the cabinet.
Where the cable consists of a separate screen sheath and wire
armour (or braid), the armour should be connected, at the cabinet
entry, to the protective earth and the screen sheath should be connected
to the GROUND terminal of the Field Interface/Relay Card or to a
suitable instrument earth point.
Combustible Sensor, Junction Box and Terminal Block Connections
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.
