P0914SV輸入輸出卡件
4-20mA變送器
4-20mA變送器電纜的最大線路電阻由系統(tǒng)57供電，隨電壓和電流變化
變送器的要求。它還受到最低要求的限制系統(tǒng)57提供的電源電壓。
最大線路回路電阻計算如下：虛擬現(xiàn)實
-VsRL=s
式中：RL=總線路電阻（歐姆）
Vr=系統(tǒng)57的最小直流電源（V）
Vs=傳感器電壓（V）
s=傳感器電流（A）
使用Vr進(jìn)行上述計算18V將容納最壞的情況是低直流電源情況。
每個鐵芯的最大電阻可通過上述公式計算得出：
配置如下
RL核心的最大電阻=歐姆控制卡傳感器驅(qū)動模塊配置
12.1概述安裝在單通道控制卡上的傳感器驅(qū)動模塊具有影響傳感器操作的配置鏈接。這個
以下各節(jié)確定了允許配置的鏈接：檢查。
12.2單通道控制卡，催化輸入鏈路設(shè)置
注意安全
傳感器驅(qū)動模塊的設(shè)置不正確，催化電流量程鏈接可能會對傳感器造成永久性損壞。
催化式傳感器驅(qū)動模塊有三個焊點位置（LK1至LK3），其允許設(shè)置電橋電流范圍。以下
范圍可用：量程電流LK1、LK2、LK3
1 219mA至283mA S/C S/C
2 66mA至230mA S/C S/C O/C
3 118mA至182mA O/C S/C O/C
4 70mA至134mA O/C O/C
S/C-短路，O/C-斷路
上述信息僅用于配置
傳感器驅(qū)動模塊，待檢查催化。當(dāng)前范圍為：出廠設(shè)置，未參考
系統(tǒng)57技術(shù)手冊。
12.3單通道控制卡，4-20mA輸入鏈路設(shè)置
注意安全
傳感器驅(qū)動模塊設(shè)置不正確，4-20mA
配置鏈接可能會對控件造成永久性損壞
卡、傳感器驅(qū)動模塊或傳感器。傳感器驅(qū)動模塊4-20mA配有13個跨接鏈路
（LK1至LK13），其允許容納多種不同的傳感器配置。通過安裝所提供的跳線來閉合連桿，以便：
連桿的兩個銷連接。未使用的鏈接應(yīng)具有
完全或小心地從傳感器驅(qū)動模塊上拆下跳線安裝在未使用連桿的單個銷上，如下所示：傳感器驅(qū)動模塊打開、關(guān)閉和備用鏈路安排
4-20mA Transmitters
The maximum line resistance of cabling for a 4 - 20mA transmitter
powered from the System 57 varies with the voltage and current
requirements of the transmitter. It is also subject to the minimum
supply voltage available from the System 57.
Maximum line loop resistance is calculated as follows:
Vr
- Vs
RL =
I
s
Where: RL = Total Line Resistance (ohms)
Vr = Minimum DC Supply to System 57 (V)
Vs = Sensor Voltage (V)
I
s = Sensor Current (A)
Making the above calculation using a Vr
of 18V will accommodate the
worst case low dc supply situation.
The maximum resistance per core can be calculated from the above
configurations as follows:
RL
Maximum Resistance of Core = ohms CONTROL CARD SENSOR DRIVE MODULE
CONFIGURATION
12.1 General
The sensor drive modules fitted to the Single Channel Control Cards
have configuration links that effect the operation of the sensor. The
following sections identify the links to allow the configuration to be
inspected.
12.2 Single Channel Control Card, Catalytic Input Link Settings
CAUTION
Incorrect setting of the Sensor Drive Module, Catalytic current
range links may cause permanent damage to the sensor.
The Sensor Drive Module, Catalytic has three solder link positions (LK1
to LK3) which allow setting of the bridge current range. The following
ranges are available:
Range Current LK1 LK2 LK3
1 219mA to 283mA S/C S/C S/C
2 66mA to 230mA S/C S/C O/C
3 118mA to 182mA O/C S/C O/C
4 70mA to 134mA O/C O/C O/C
S/C - Short Circuit, O/C - Open Circuit
The above information is only provided to allow the configuration of the
Sensor Drive Module, Catalytic to be checked. The current range is
factory set and should not be altered without reference to the
SYSTEM 57 Technical Manual.
12.3 Single Channel Control Card, 4 - 20mA Input Link Settings
CAUTION
Incorrect setting of the Sensor Drive Module, 4 - 20mA
configuration links may cause permanent damage to the Control
Card, Sensor Drive Module or Sensor.
The Sensor Drive Module, 4 - 20mA is fitted with thirteen jumper links
(LK1 to LK13) which allow numerous different sensor configurations to be accommodated. A link is closed by fitting the jumper provided so that
the two pins of the link are connected. Unused links should have their
jumper removed from the Sensor Drive Module altogether or carefully
fitted over a single pin of an unused link as follows:
Sensor Drive Module Open, Closed and Spare Link
Arrangements
