DCS电源触发板SDCS-PIN-3B工业模块
长度超过3m的数字信号电缆和模拟信号电缆必须屏蔽。每个屏幕必须
两端用金属夹连接（见图5.2-4），或直接在干净的金属表面上进行比较，如果两者
接地点属于同一接地线。否则，电容器的一端必须接地。在变流器柜内
这种连接必须直接在金属板上进行
靠近端子（见27），如果电缆来自外部也在PE杆上（见25和26）。在电缆的另一端屏幕必须与信号外壳良好
发射器或接收器。如果电缆过长，则必须使用带屏幕的电缆易受EMC环境条件影响的距离（>20m）。电缆可以具有例如优选由铜或铝制成的编织或螺旋屏蔽。转移电力电缆的阻抗ZT必须小于0.1Ω/我在频率范围高达100 MHz，以确保有效减少发射并显著提高抗扰度。这个必须使用导电良好的金属夹直接按压屏幕
紧靠变频器柜的安装板或PE条（见24）。另一个连接选项是通过EMC套管。那里接触面应清洁并尽可能大。体育电线可与PE杆上的普通电缆插座连接。
至电枢和励磁绕组的屏蔽电缆
导致最低噪声水平。如果不需要屏幕（见13），则电枢电流电缆
必须是四线电缆，因为需要两根导线作为从电机到射频滤波器的寄生射频电流的导体
在隔间里。如图5.2所示，非屏蔽励磁电流电缆F必须直接沿电枢电缆A安装-5.2线电缆就足够了。
图5.2-5励磁电流布置横截面图
电缆F和电枢电缆A
根据26所述的布置已经用20 m长的电机电缆，从而满足传导发射要求。
如果到电枢的连接由单线电缆制成，然后，n+1根PE电缆必须与它们一起布置在电缆轨道上，如图5.2-6所示，其中n=4。
The cables for digital signals, which are longer than 3 m and all cables for analogue signals, must be screened. Each screen must be
connected at both ends by metal clamps (see figure 5.2-4) or
comparable means directly on clean metal surfaces, if both
earthing points belong to the same earth line. Otherwise a capacitor must be connected to earth on one end. In the converter cubicle
this kind of connection must be made directly on the sheet metal
close to the terminals (see 27) and if the cable comes from outside
also on the PE bar (see 25 and 26). At the other end of the cable
the screen must be well connected with the housing of the signal
emitter or receiver.Power cables with screens are necessary, if they run over long
distances (>20 m) where they are susceptible to EMC environmental conditions. The cable may have e.g. either a braided or spiral screen made preferably of copper or aluminium. The transfer
impedance ZT of the power cable must be less than 0.1 Ω/m in the
frequency range up to 100 MHz, in order to ensure an effective reduction of emission and a significant increase of immunity. The
screen must be pressed by a well conducting metal clamp directly
against the mounting plate or the PE bar of the converter cubicle
(see 24). Another connection option is via EMC sleeve. There the
contact surface shall be clean and as large as possible. The PE
wire can be connected with a normal cable socket at the PE bar.
Screened cables to the armature and to the excitation winding
cause the lowest noise level.If a screen is not necessary (see 13) the armature current cable
must be a four-wire cable because two wires are needed as conductors for the parasitic RF currents from the motor to the RF filter
in the cubicle. The unscreened field current cable F must be installed directly along the armature cable A as shown in figure 5.2-
5. A 2-wire cable is sufficient.
Figure 5.2 - 5 Cross-sectional view of arrangement of field current
cable F and armature cable A
The arrangement according to 26 has been tested with a 20 m long
motor cable with the result that the conducted emission requirements are fulfilled.
If the connections to the armature are made from single-wire cables, especially if n parallel wires are necessary for higher currents,
then n+1 PE cables must be arranged together with them on a cable rail as shown in principle by the figure 5.2-6 with n=4.
