NI SCXI-1302模拟硬件模块,SCXI-1302产品尺寸
安装接线盒PFXC 141
PFXC 141通常用于连接Pressductor®称重传感器，其中距离称重传感器和张力电子装置之间的距离很长。固定在称重传感器上的电缆和连接至控制单元的电缆应连接至接线盒。
接线盒PFXC 141应安装在称重传感器附近，并位于易于维修的受保护位置。
接线盒的尺寸如图2-11所示。未使用的孔必须堵住。
NI SCXI-1302模拟硬件模块电路图见附录A.5.3接线盒PFXC 141。绝缘放大器PXUB 201（仅适用于IP 20版本）
当输入和输出之间存在电流绝缘时，使用绝缘放大器PXUB 201，或电源和输入/输出之间需要。参见第A.5.1节绝缘放大器PXUB 201。
绝缘放大器PXUB 201拟安装在DIN导轨上。PXUB 201是通过螺钉端子连接。
PXUB 201通常由提供张力的相同+24 V DC电源供电如果PXUB 201安装在端子组附近，则不需要在要屏蔽的张力电子设备和PXUB 201。电源装置SD83x如果没有24 V可用电压，电源装置SD 831、SD 832和SD 833可以用作IP 20版本的电源。电源装置拟安装在DIN导轨上。
所有三个电源装置的主电源电压为：
•115 V AC（90-132 V），100 V-10%至120 V+10%
•230 V AC（180-264 V），200 V-10%至240 V+10%
PFXC 141 are normally used for connection of Pressductor® load cells where the distance
between load cells and tension electronics is long. The cables fixed to the load cells and the
cable to the control unit are to be connected to the junction box.
The junction box PFXC 141 shall be mounted adjacent to the load cells and located in a
protected position easily accessible for service.
The dimensions of the junction box are shown in Figure 2-11.
Holes not used must be plugged.
For circuit diagram see Appendix A.5.3 Junction Box PFXC 141. Insulation Amplifier PXUB 201 (only for the IP 20-version)
Insulation amplifier PXUB 201 is used when galvanic insulation between input and output, or
between power supply and input/output, is required. See Section A.5.1 Insulation Amplifier
PXUB 201.
Insulation amplifier PXUB 201 is intended to be installed on a DIN-rail. The PXUB 201 is
connected by screw terminals.
PXUB 201 is normally supplied from the same +24 V DC supply that supplies the tension
electronics.
If PXUB 201 is mounted close to the terminal group, it is not necessary for the cable between
the tension electronics and PXUB 201 to be screened. Power Supply Unit SD83x
If no 24 V is available, the power supply units SD 831, SD 832 and SD 833 can be used as
power supply for the IP 20-versions.
The power supply unit is intended to be installed on a DIN-rail.
The main supply voltage for all the three power supply units are:
• 115 V AC (90 - 132 V), 100 V -10% to 120 V + 10%
• 230 V AC (180 - 264 V), 200 V -10% to 240 V + 10%
