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_ arcs are the most difficult to extinguish on a set of contacts. _ power line(s) must be broken when using a contactor to control a 3Φ load.
#THE MAIN FUNCTION OF THE LADDER LOGIC PROGRAM IS TO CONTROL OUTPUTS BASED ON ______ CONDITIONS MANUAL#
Manual motor starters are used in application such as air compressors, conveyor systems, and _?Ī _ overload measures the strength of the magnetic field around the wire instead of converting the current into heat. NEMA Type _ enclosures are intended for indoor use primarily to provide a degree of protection against human contact with the enclosed equipment in locations where unusual service conditions do not exist. _ contacts are contacts that break the electrical circuit in two places. _ temperature is the temperature of the air surrounding a motor.Ī _ alloy is a metal that has a fixed temperature at which it changes directly from a solid to a liquid state.Ī starter may be reset after an _ is removed.Įnclosures provide _ and electrical protection for the operator and the starter.Ī _ is a control device that uses pushbuttons to energize or de-energize the load connected to it. Overload protection devices are required by the _? The main device in an overload relay is the _?Ī manual starter is a _ with an added overload protection device. Manual contactors are normally used with _ circuits and resistance loads.
![the main function of the ladder logic program is to control outputs based on ______ conditions the main function of the ladder logic program is to control outputs based on ______ conditions](http://engineeronadisk.com/V2/book_integration/engineeronadisk-61.gif)
The three stages that a motor must go through in normal operation are resting, starting, and _?įuses or _ are used to protect a motor against very high currents, short circuits, or a ground fault.Ī 120 V, 1Φ power source has one hot wire and _ neutral wire(s).Ī 230 V, 1Φ power source has two hot wires and _ neutral wire(s).Ī 3Φ power source has _ hot wires and zero neutral wires.Ī _ is a device that is used only periodically to remove electrical circuits from their supply source. Manual starters are selected based on phasing, number of poles, voltage, starter size, and _?Ī _ is a condition that occurs when a motor is loaded so heavily that the motor shaft cannot turn. _ interlocked contactors are two contactors that are connected in such a way that both sets of contacts cannot be closed at the same time. Has a higher contact rating in a smaller space.Ĭopper contacts have been replaced with _ alloy contacts because of the problems of using copper with knife switches.Ī _ diagram shows the connection and placement of an installation or its component devices or parts. One of the advantages of using a double-break contact instead of a single-break contact is that a double-break contact _? These operator interfaces can be simple displays, with a text-readout and keypad, or large touchscreen panels more similar to consumer electronics, but either way, they enable users to review and input information to the PLC in real time.When motors were first introduced, they were started and stopped by _?
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