S-073N 3BHB009884R5211 | ABB Power control frame

Description

DCS systems typically use several controllers (processing stations) to control multiple control points in the production process, each of which is connected via a network and can exchange data. The operation adopts computer operation station, which is connected with the controller through the network to collect production data and transmit operation instructions. Structurally,DCS includes process level, operation level and management level. The process level is mainly composed of process control station, I/O unit and field instrument, which is the main executive part of the system control function. Operation levels include: operation station, engineering station, complete system operation and configuration. In the field grounding, you must strictly comply with the grounding specifications of the DCS manufacturer, otherwise the reliability of the DCS system will be affected. When placing a developing country system in the field, the following points should be noted: (1) The power supply of the I/O cabinet and the power supply of the UPS must be connected to the same power supply to ensure the same potential. (2) The grounding cable must meet the requirements of the DCS manufacturer and be connected with the special grounding screw in the cabinet. (3) The system grounding and shielding grounding cannot be combined in the cabinet and must be connected separately from the grounding power grid. (4) The grounding of the box can not be replaced by the parallel bolts of the box, and must be strictly connected with the grounding wire. (5) The grounding should be solid and reliable, and the bus connecting plate should be coated with anti-corrosion paint. (6) The grounding resistance meets the requirements of the DCS system and must be strictly measured.

From the hierarchical structure of the DCS control system, it can be divided into three main parts: the controller with I/O components, the communication network and the human machine interface (HIS). Controller I/O components are directly connected to the production process and receive signals from field equipment; Man-machine interface is a device for exchanging information between operator and DCS. The communication network connects the controller and the man-machine interface, forming an organic whole. Communication networks in early developing country systems were dedicated, with several layers of networks to complete communication between different modules. From the current situation,DCS has four largest network levels, that is, I/O bus, fieldbus, control bus and DCS network. I/O bus, which sends various I/O signals to the controller, and the controller reads the I/O signals. This is my car. I/O boards do not exchange data with each other. The speed of the bus is not high. From ten kilobytes to several megabytes. It has something to do with the development of computer technology. In the early 1980s it was 20k, in the mid-1980s it was 40k, in the late 1980s it was 80k, and in the 1990s it was megabytes. For speed, it is best to use a parallel bus. With parallel buses, the I/O module must be adjacent to the control module. In the case of using a serial bus, the distance between the I/O board and the controller should also be relatively close. It is advisable to install the control module and I/O module in one or adjacent cabinets. Remote I/O should use fieldbuses. Such as Eneng, Changgong, Hart bus, etc. The field bus system was developed in the early 1990s.

In terms of hardware, there should be input and output boards in the I/O board, which can receive signals from the fieldbus. From a software point of view, there should be functional blocks in the controller for reading and writing fieldbus signals. In DCS systems, remote I/O uses one of the more common Hater buses. For example, for a field transmitter that is relatively far from the control cabinet, the signals from 16 transmitters will be combined and sent to the controller using the HART bus. The controller reads signals from 16 transmitters simultaneously. The distance between the controller and the transmitter can exceed 1 km. Almost all DCS systems imported from the United States and Europe have a Hart protocol board. In practical applications, remote signals are common. For example, in a cement factory, the distance between the kiln head and the kiln tail of the rotary kiln is several hundred meters. If you set up two nodes on the network, you need two sets of interface modules, and the cost of interface modules is relatively high. If a node is set up, remote I/O is required, regardless of whether the node is located at the head of the kiln or at the geographical location at the tail of the kiln.

Features and applications of ABB power module Abb power modules use advanced integrated circuit technology to integrate power devices and logic control circuits in a highly integrated, fully sealed integrated block with power function. Power module has the advantages of convenient use and reliable performance, which represents the development direction of power technology. Switching power supply has the advantages of high efficiency, small size, suitable for integration; However, due to the low efficiency of linear regulated power supply, which is generally about 50%, it is difficult to realize the integration of high power (over 100W). The power module introduced by Jimi Technology refers to the switching power module, mainly for DC/DC converters. Today's switching power modules can reach hundreds of watts or even kilowatts. Power module products mainly include DC/DC converter module, power factor correction module, AC input module, etc. Its main characteristics are: ◆ ABB power module has a high working frequency, generally 300KHz~1MHz. ◆ ABB power module is small, ultra-thin, thickness is generally less than 20mm, light weight is generally less than 200g. ◆ ABB power modules have high power density, ranging from 5 to 10W/ cc. ◆ ABB power module is easy to use, with few external components, parallel expansion, logic control and remote control. ◆ ABB power module is suitable for the wide range of power grid voltage changes. When the AC voltage fluctuates from 150V to 280V, the output voltage can remain stable. ◆ ABB power module has a wide temperature range, from -55℃ to +100℃. Generally, the high temperature substrate temperature is +85℃, and the low temperature is 0℃, -20℃, -40℃, -55℃ and so on. ◆ ABB power module is fully sealed, with three protection functions, waterproof, dustproof, anti-impact. ◆ ABB power modules generally adopt zero voltage switch or zero current switch technology, with good electromagnetic compatibility. ◆ ABB power module has a high standard structure and is easy to install.

The company focuses on DCS, PLC, robot, large servo four systems

The main products are various modules/cards, controllers, touch screens, servo drivers Company advantage: Supply imported original products, professional production of spare parts One year warranty, fast delivery time, complete supply !！！ ① 24 hours email response (12 hours); ② For shipment outside Asia, please contact the seller.

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