Woodward 5437-283模块备件

Woodward 5437-283

2.7外部电气连接——图2.3
外部电气连接应在用户体内找到
接线盒，可选串行接口除外
其直接连接到微处理器单元中。这个
电缆穿过右侧的电缆密封套
与内部电气系统相邻的接线盒
终端。
小心制造前，完全松开端子螺钉
连接。
连接如下：
a） 电源输入115V（110至120V）或230V（220至240V）。这个
电源电压通过电压选择器选择–
见图2.3。
b） 电流输出1和2–两个独立的电流输出，用于：
外部记录或控制。一个输出被提供为
标准配置，第二个作为可选额外配置提供–请参阅
有关电流输出范围的详细信息，请参见图2.4。
信息由于电流输出是隔离的
如果出现以下情况，负子必须接地：
连接到另一设备的隔离输入。
c） 继电器1和2–两个浓度警报。
d） 继电器3–校准模式指示。这表明当
仪器在校准期间离线。
e） 继电器4–仪表“停止使用”指示。这
表示监视器读数可疑且处于正常状态
需要注意。
f） 继电器5–“样本不足”–样本丢失指示。
g） 可选串行接口–连接到微处理器单元。有关详细信息，请参阅补充说明手册
详情2.8继电器触点保护和干扰
抑制–图2.5
如果继电器用于接通或断开继电器触点上的负载
可能由于电弧而被腐蚀。电弧还产生无线电
频率干扰（r.f.i.），可能导致仪器故障
故障和错误读数。为了大限度地减少噪声的影响
r、 f.i.需要消弧部件；这些是
用于交流应用的电阻器/电容器网络或用于直流应用的二极管。
应用。这些组件可以通过以下方式连接：
负载或直接穿过继电器触点。
对于交流应用，电阻器/电容器网络的值
取决于切换的负载电流和电感。
初始安装100R/0.022μF RC抑制器装置（零件号B9303）
如图2.5A所示。如果仪器发生故障，则
RC网络对于抑制来说太低，并且是一种替代方案
必须使用值。如果不能使用正确的RC抑制器单元
获得后，请联系开关设备的制造商以获取更多信息
所需RC单元的详细信息。
对于直流应用，安装二极管，如图2.5B所示。对于
一般应用使用替代的IN5406型（600V峰值
3A处的反向电压–零件号B7363）。
笔记为了可靠切换，小电压必须为：
大于12V且小电流大于
100mA

Woodward 5437-283

Woodward 5437-283

2.7 External Electrical Connections – Fig. 2.3
The external electrical connections are to be found in the User
Junction Box with the exception of the optional serial interface
which is connected directly into the Microprocessor Unit. The
cables are passed through the cable glands on the right hand side
of the junction box which are adjacent to the internal electrical
terminals.
Caution. Slacken the terminal screws fully before making
connections.
The connections are as follows:
a) Mains input 115V (110 to 120V) or 230V (220 to 240V). The
mains voltage is selected by means of the voltage selector –
see Fig. 2.3.
b) Current outputs 1 and 2 – two independent current outputs for
external recording or control. One output is supplied as
standard, the second is supplied as an optional extra – see
Fig. 2.4 for details regarding current output range.
Information. Because the current output is isolated, the
negative terminal must be connected to earth (ground) if
connecting to the isolated input of another device.
c) Relay 1 and 2 – two concentration alarms.
d) Relay 3 – calibration mode indication. This indicates when the
instrument is off line during a calibration.
e) Relay 4 – instrument 'OUT OF SERVICE' indication. This
indicates that the monitor readings are suspect and it is in
need of attention.
f) Relay 5 – 'OUT OF SAMPLE' – indication of loss of sample.
g) Optional serial interface – connected into the Microprocessor Unit. See supplementary instruction manual for
details2.8 Relay Contact Protection and Interference
Suppression – Fig. 2.5
If the relays are used to switch loads on or off the relay contacts
can become eroded due to arcing. Arcing also produces radio
frequency interference (r.f.i.) which can cause instrument
malfunctions and incorrect readings. To minimize the effects of
r.f.i., arc suppression components are required; these are
resistor/capacitor networks for a.c. applications, or diodes for d.c.
applications. These components can be connected either across
the load or directly across the relay contacts.
For a.c. applications the value of the resistor/capacitor network
depends on the load current and inductance that is switched.
Initially fit a 100R/0.022μF RC suppressor unit (part no. B9303)
as shown in Fig. 2.5A. If the instrument malfunctions the value of
the RC network is too low for suppression and an alternative
value must be used. If the correct RC suppressor unit cannot be
obtained, contact the manufacturer of the switched device for
details of the RC unit required.
For d.c. applications fit a diode as shown in Fig. 2.5B. For
general applications use an alternative IN5406 type (600V peak
inverse voltage at 3A – part no. B7363).
Note. For reliable switching the minimum voltage must be
greater than 12V and the minimum current greater than
100mA