DDC779CE102 ABB 电源模块 隔离变压器

货号:DDC779CE102

品牌:ABB

产品认证:DDC779CE102

是否跨境出口专供货源:是

DDC779CE102 3BHE027859R0102需将PLC设备系统地和控制柜内开关电源负端接在—起

电源的合理处理，抑制电网引入的干扰

对于电源引入的电网干扰可以安装一台带屏蔽层的变比为1:1的隔离变压器，以减少设备与地之间的干扰，还可以在电源输入端串接LC滤波电路。

正确选择接地点，完善接地系统。

良好的接地是保证plc可靠工作的重要条件，可以避免偶然发生的电压冲击危害。接地的目的通常有两个，其一为了安全，其二是为了抑制干扰。完善的接地系统是PLC控制系统抗电磁干扰的重要措施之一。

PLC DDC779CE102 控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均，不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。例如电缆屏蔽层必须一点接地，如果电缆屏蔽层两端A、B都接地，就存在地电位差，有电流流过屏蔽层，当发生异常状态如雷击时，地线电流将更大。

此外，屏蔽层、接地线和大地有可能构成闭合环路，在变化磁场的作用下，屏蔽层内又会出现惑应电流，通过屏蔽层与芯线之间的耦合，干扰信号回路。若系统地与其它接地处理混乱，所产生的地环流就可能在地线上产生不等电位分布，影响PLC内逻辑电路和模拟电路的正常工作。 DDC779CE102 PLC工作的逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存贮，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。

安全地或电源接地

将电源线接地端和柜体连线接地为安全接地。如电源漏电或柜体带电，可从安全接地导入地下，不会对人造成伤害。

系统接地

PLC控制器为了与所控的各个设备同电位而接地，叫系统接地。接地电阻值不得大于4Q，一般需将PLC设备系统地和控制柜内开关电源负端接在一起，作为控制系统地。

ABB 3BHEO27859R0102 DDC779CE102 处理器模块

在收料、放料或过程中不断调整离合器或制励器的扭矩，从而获得所需的张力，这就要求用户必须随时检查被控材料的张力，随时调节翰出力矩，若用气动制动器或离台器时，手动按制器可直接选用精密调压阀，可使用户节约一定的设备成本，但仅适用于一些低速的复合机、挤出机、纺织机械等张力控制要求不高的场合。

利用超声波原理等自动检出卷径，从而调整卷料张力，何例如∶东莞台灵机电有限公司ST型张力控制器，从本质上来讲是一种张力的半闭环控制，不仅可以自动觇出卷经、控制扭矩输出，同时还具有缓冲启动、防松卷和惯性补偿等功能。该方案的实施成本较低，因此在中档机械中应用广泛。

DDC779CE102 ABB 电源模块 隔离变压器

Item number :DDC779CE102

Brand :ABB

Product Certification :DDC779CE102

Whether cross-border export is a source of goods: Yes

DDC779CE102 3BHE027859R0102 The PLC device should be systematically connected to the negative end of the switching power supply in the control cabinet

Reasonable disposal of power supply to suppress the interference introduced by the power grid

For the interference of the power grid introduced by the power supply, an isolation transformer with a shielding layer of 1:1 can be installed to reduce the interference between the equipment and the ground, and the LC filter circuit can be connected in series at the power input end.

Select the ground point correctly and perfect the grounding system

Good grounding is an important condition to ensure the reliable operation of plc, which can avoid the harm of accidental voltage shock. The purpose of grounding is usually two, one is for safety, and the other is to suppress interference. Perfect grounding system is one of the important measures for PLC control system to resist electromagnetic interference.

The ground wire of PLC DDC779CE102 control system includes system ground, shielding ground, alternating ground and protection ground. The disturbance of the grounding system to the PLC system is mainly the uneven distribution of potential at each ground point, and the ground potential difference between different ground points, which causes the ground loop current and affects the normal operation of the system. For example, the cable shield layer must be grounded at one point. If A and B at both ends of the cable shield layer are grounded, there is a ground potential difference and a current flows through the shield layer. When an abnormal state occurs, such as lightning strikes, the ground current will be larger.

In addition, the shielding layer, the ground wire and the earth may form a closed loop, and under the action of changing magnetic fields, there will be inductive current in the shielding layer, which will interfere with the signal loop through the coupling between the shielding layer and the core wire. If the system is confused with other grounding, the resulting ground circulation may produce unequal potential distribution on the ground wire, affecting the normal operation of the logic circuit and analog circuit in the PLC. The logic voltage interference tolerance of DDC779CE102 PLC is low, and the distribution interference of the logic ground potential is easy to affect the logic operation and data storage of PLC, resulting in data confusion, program flying or crash. The distribution of simulated ground potential will lead to the decrease of measurement accuracy, and cause serious distortion and misoperation of signal measurement and control.

Secure or power ground

Use the grounding terminal of the power cable and the cabinet grounding as safety grounding. If the power leaks or the cabinet is live, it can be led into the ground from the safety ground, without causing harm to people.

System grounding

The PLC controller is grounded to the same potential with each device controlled, which is called system grounding. The grounding resistance value shall not be greater than 4Q, and it is generally necessary to systematically connect the PLC device to the negative end of the switching power supply in the control cabinet as a control system.

ABB 3BHEO27859R0102 DDC779CE102 processor module

Constantly adjust the torque of the clutch or exciter in the receiving, discharging or process, so as to obtain the required tension, which requires the user to check the tension of the controlled material at any time, adjust the torque at any time, if the pneumatic brake or off-platform device is used, the manual press can directly select the precision pressure regulator, which can save users a certain equipment cost. However, it is only suitable for some low-speed composite machines, extruders, textile machinery and other occasions where the tension control requirements are not high.

The ultrasonic principle is used to automatically detect the diameter of the coil, so as to adjust the tension of the coil, such as: Dongguan Tai Ling Machinery Co., Ltd. ST tension controller, essentially speaking, is a tension semi-closed loop control, not only can automatically target the winding, control torque output, but also has the buffer start, anti-loose coil and inertia compensation functions. The implementation cost of this scheme is low, so it is widely used in mid-range machinery.