tailieunhanh - Ebook Industrial control wiring guide (2nd edition): Part 2

(BQ) Part 2 book "Industrial control wiring guide" has contents: Connections and routing, hardware, components (active), components (passive), switches and lamps, earthing and screening, PLC wiring. | 6. CONNECTIONS AND ROUTING . General These are some general points that should be taken into account when wiring the control panel. ᭹ ᭹ Stud Lock nut Star washers Earth connector 62 Connections should be secured against accidental loosening. Correctly tighten terminal screws and where a connecting plug is fitted, use the clamps or screws provided to secure it to its mating socket. Particular attention in this respect should be taken with the protective bonding circuit, for example by using star washers and a lock nut where necessary. 6. CONNECTIONS AND ROUTING ᭹ ᭹ 1 1 2 1 2 Two or more conductors may only be connected to a terminal that is designed for the purpose. The majority of connecting blocks will only take one or two conductors. Don’t force in any more. Add an additional terminal and connect it to the other by a link laid in the cable trucking to gain an extra connection point. ᭹ Soldered connections should be made only to terminals suitable for that purpose. Transformers may be fitted with turret tags suitable for soldering and printed circuit board assemblies may have solder pins. 3 3 Solder tags Use nuts and star washers Fixing screw 63 6. CONNECTIONS AND ROUTING ᭹ ᭹ Pigtail 64 A means of retaining conductor strands should be provided where terminals are not equipped with this facility, for example by crimping on bootlace ferrules. Do not use solder. ᭹ Sleeving Ensure that identification tags and cable markers are legible, marked with a permanent ink and suitable for the environment where the panel is to be used. They should also correspond with those shown in the machine drawings and instruction or service documentation. ᭹ Bootlace ferrule Terminals and terminal blocks should be clearly marked and identified to correspond to the markings in the drawings. The terminations of shielded or screened conductors should be terminated so that the screen cannot fray. If the screen is to be connected then make it off in the .