What is an overtravel switch?
What is an overtravel switch?
What exactly is over-travel for a switch? In general, it is the distance a button/actuator can be pressed beyond the operating distance without damaging the mechanism. Typically, this terminology applies to limit switches/micro-switches.
What is overtravel limit switch?
The overtravel limit switches for power circuit switching are specifically designed to ensure the safety of hoisting equipment. They directly break the power supply to the hoist motor if the load being handled accidentally exceeds the operating limits of the equipment.
What is differential travel switch?
During the release phase of switch actuation, the differential travel is the distance the switch moves as the contact transfers from one switch state to the other (on to off, off to on, or one pole to another). Related terms: operating position, overtravel, pretravel, release position, release travel, rest position.
What is the purpose of limit switches?
In electrical engineering, a limit switch is a switch operated by the motion of a machine part or the presence of an object. A limit switch can be used for controlling machinery as part of a control system, as a safety interlock, or as a counter enumerating objects passing a point.
What is total travel position?
Final position (total travelled position) Reset point (mech.) The position of the actuator at the end of its travel. The point along the actuator’s path, as it travels back to its rest position, at which the spring-operated mechanism snaps back to its original position. Initial force Operating point (mech.)
Does limit switch have polarity?
Limit switch contacts may be NO, NC, or any combination of NO and NC contacts. To prevent arcing or welding of the contacts, they must be connected to the proper polarity. There is no arcing between the contacts when the contacts energize and de-energize the load as long as the contacts are of the same polarity.
What is movement differential?
Movement differential The difference between the operating force and The distance travelled between the operating point the reset force.
What type of switch is a proximity switch?
Proximity Switch PNP Type An electronic switch designed to sink current through its signal wire is alternatively referred to as an NPN switch due to the type of transistor used in its output.
What is the meaning of overtravel?
Definition of overtravel. : amplitude of motion of a machine part or tool beyond that necessary to complete its purpose.
What is the operating position of a switch?
Operating Position (O.P.)—Position of switch plunger or actuator at which point contacts snap from normal to operated position.Notethatinthecaseofflexibleor adjustable actuators, the operating posi- tionismeasuredfromtheendofthelever or its maximum length. Location of oper-
What is the dead break of a switch?
Dead break is expressed in distance of plunger travel during which the non-contact occurs. Manufacturing specifications for most BZ/BA basic switches allow a maximum dead break of 0.00005 in. (0,001 mm) measured at the switch plunger. Switches are evaluated
