Friday, June 24, 2011

The Use of Control Relays in Modern Electronic Equipments





What is Control Relays?
Control relays are applied in electric as well as electronic equipments. Motors, transistors, uninterrupted power supply system, power plants, and power meters are a few of the equipments that control relays are applied. Control relay is a device that closes or opens an electrical switch in accordance with the electric current flow by a conducting coil. It's an electromagnetic device and the switches don't arrive in direct contact on the conducting coil. In many cases, control relays controls the major power flow in an electric circuit.

How Control Relays Functions?
Control relays functions in two ways. As electric current runs through the electromagnetic coil, the current draws a magnetic matter which closes down the switch and the other way around once there's no current run through the coil. An outflow will help in the closing as well as the opening of the electrical switch. The relay won't get into an intermediate level between off and on. Electronic circuits could be joined to the relays in order to make them function automatically. Logical controller or programmable micro controller are used in electronic and also in complex control relays.

Control relays functions essentially by the rule of magnetization as well as de-magnetization. As current runs by the coil it produces magnetic poles within the coil, known as the South Pole and North Pole. These magnetic poles pull in an armature which would be joined to a spring. So long as the current is sufficient in the coil, the armature stays attracted to the coil and the switch will stay in the on condition. As the current value drops, the attractive pull of the coil is sweep over by the electric potential energy of the spring, therefore the spring draws back the armature as well as the electrical switch continues to the off position. Control relays efficiency is calculated by considering how fast the control relays may switch between the levels.

A lot of elements are looked at while projecting control relays. The magnetic and conducting properties from the coil, and also the nature of the coil's material are significant elements. In addition to that, the magnitude electric current flow ought to also be brought into consideration. Whenever the current passes the electrical capacity of the coil and so the relay and all the equipments attached to it can get tarnished. Temperature ought to be maintained below a level which the control relays can endure. Control relays ought to be functioned in optimum temperature circumstances as it impacts the life span of the device.



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