tailieunhanh - Industrial Control Wiring Guide 2E Episode 5

Tham khảo tài liệu 'industrial control wiring guide 2e episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 4. SOLDERING AND TERMINATION . Crimped joints The majority of wire terminations used in control panel assembly are made with crimp connectors. The main reason for this is that they are easy and quick to produce. Crimping simply means that the conductor is placed into a special crimp connector which is then compressed around it with the use of a crimping tool. See Section . . Crimp connectors The crimp fitting end of the connector has a wire barrel of a suitable diameter to take the conductor. It is this part that is compressed by the crimp tool. The wire barrel may be open. Or closed. It may be insulated. The conductor should be a snug fit in the barrel. 34 4. SOLDERING AND TERMINATION The actual connector can have any one of a wide variety of shapes determined by the requirements of the job. Here are some commonly used single wire crimp connectors. All are insulated in these examples. . Crimping tools The purpose of the crimp tool is to correctly apply pressure to the wire barrel to trap the conductor tightly so that it cannot be pulled out under normal circumstances. At the same time it must not be so tight as to cause strands or the connector to break. Crimping tools may be operated in various ways dependent not only on the size of the conductor but sometimes on the total number of crimps that will be needed. However they are all similar in operation. Hand-operated. Used for light duty work -smaller conductors and small quantities. These are described here in detail. Power-operated. These can be powered by compressed air electric or hydraulics. Generally they are bench-mounted but there are hand-held types. Manufacturer s instructions should be followed carefully. SAFETY Take care when using power crimpers. Guards should be fitted. 35 4. SOLDERING AND TERMINATION . Hand tools There are basically two parts to the crimping tool. The jaws which are special to the type of connector and which are often changeable. The handles which are usually