By Bhattacharya S. K., Singh B.

Keep an eye on of Machines is among the most crucial sensible components for electric and mechanical engineers operating in undefined. during this period of automation and keep watch over, each engineer has to acquaint himself at the layout set up, and upkeep of keep watch over structures. This topic needs to locate its position as a mandatory utilized engineering topic in measure and degree curriculum. a few revolutionary states and independent associations have already brought this topic of their curriculum. during this ebook, static keep watch over and programmable controllers were incorporated conserving in view the most recent advancements in glossy undefined. Relay and static keep watch over were handled in information. many of the regulate circuits integrated during this ebook were taken from Indian undefined. A bankruptcy has been dedicated to safeguard of vehicles and troubleshooting up to the mark circuits. The bankruptcy on PLC has been made very difficult to house all features of common sense controllers. overview questions were incorporated on the finish of every bankruptcy. the reasons of circuits and layout method of keep watch over circuits were made extremely simple to aid scholars comprehend simply. scholars, academics and store flooring and layout workplace engineers will locate this e-book a truly precious significant other.

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Closing of contact L1 energises motor contactor C. When power fails relay does not drop and contact L1 remains closed. Therefore when power is restored, contactor C gets energised automatically and there is no need to push the ON-push button. Whenever it is desired to stop the motor the OFF-push button is pressed which energises the unlatch coil and thus contact L1 opens. 7 OVERLOAD RELAYS The function of overload relay is to protect a motor against overloading. When a motor is mechnically overloaded it will draw more current than its rated value.

3 Lock-out Type Contactor This type of contactor was primarily designed for the starting circuit of dc motors. Lock out contactors are used for cutting the resistance of the armature circuit of a motor in steps. The contactor is so designed that its contacts normally remain open. They also remain open during the inrush current on starting of motors. , a closing coil and a lock-out coil. The lock-out coil prevents the contactor from closing during the inrush current of the motor. The magnetic circuit of closing coil (A) is made of such magnetic material which gets saturated easily.

In a mechanical latched relay, when armature is pulled by the operating coil (latch coil) a mechanical latch engages the armature and holds it in place even when the coil voltage is removed. The relay can be brought back to the de-energised position when the mechanical latch is opened by energising the unlatch coil. In permanent magnet type latch relay the magnetic circuit material gets permanently magnetised when current flows through the operating coil (latch coil). Both the latch coil and the unlatch coil are mounted on the same magnetic core.

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