Electrical & Electronic
2-2002 It's so simple
Problem: No matter how modular a manufacturer claims its components are, there are
often steps further down the line which can offset any gains contributed by clever design.
In the world of electrical components, this offset is often provided by over complicated
or time-consuming wiring. Wiring can also provide an avenue for failure, as, if it is not
done correctly, the good work put in by the component manufacturer will be wasted.
Many components also require a certain amount of disassembly to get to the all-important terminals to which the wires must be attached. This also adds a weak link in that should the component be reassembled incorrectly, foreign object ingress can cause all manner of problems.
Solution: By incorporating Insulation Displacement Terminals (IDT), Honeywell
Sensing & Control has removed many of the wiring vagaries from its latest range of
limit switches. The company claims that wiring times can be cut by up to 50%.
Due to the incorporation of IDT technology, the EVN2000 series offers a fully enclosed casing and no removable external parts. It eliminates the requirement to access the housing, removing the need for screws and gaskets as well as automatically providing cable sealing and strain relief.
All the user has to do is remove the outer jacket from the wire. The inner cores are then fed into a plastic insert which separates and aligns them with the internal switch circuit. The user then pushes the insert into the housing and tightens a single nut. This act of closure ensures electrical connection, sealing and strain relief for the cable.
Applications: The limit switch is designed for OEMs in a variety of industries
including elevators, moving stairs, scissor/platform lifts, materials handling, and food
and beverage manufacture.
The series offers a snap-action 1 NC/1 NO operation, with a 4mm air gap and a choice of four actuator types. It is designed to meet the switch requirements of EN 81-1:1998 and is CE marked according to EN60947-5-1:1998. It also conforms to EN50047 making it interchangeable with many existing products. MF