Instrumentation limited kota

TAKEN AT

INSTRUMENTATION LIMITED ,KOTA

“INSTRUMENTATION LTD, KOTA” is a govt. of India Enterprise established in Kota (Raj.) in 1966-67

It has its plant at Kota,& Palakkad (Kerala) with over 25 years of experience and a dedicated work force.

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For assembly &testing of hi-tech electronic instrument, totally dust free air conditional hall are used with static protection.

Rajasthan electronics & Instruments ltd. (REIL) Jaipur is a subsidiary of IL and is manufacturing & supplying non conventional energy devices and electronic energy meters.

The products manufactured at IL are accredited with ISO 9000 series quality system certification.

IL has supplied over 3000 units of mini UPS ranging from 1kva to 150 kva.

It has supplied instruments on turn key basis for 2 thermal power stations in Malaysia & established a service center at Kufa complex in Iraq.

I have visited following sections during my training period that are:-

Railways Signaling Relay department Card Assembly (PCB centre) UPS (Engineering, Production, Servicing) centre

A relay is an electrical device that opens or closes several circuits in response to a current in another circuit.

By energizing / de-energizing one relay, several other relay circuits can be controlled by contacts of that relay.

When the relay coil is energized , this creates an electromagnetic field that attracts the relay armature to the coil.

Attached to this armature is a mechanism for either opening or closing the relay contacts that are electrically independent from the input voltage to the relay coil.

Most relays have two types of contacts. One set of contacts are “made” or closed when the relay is energized. These are known as “Front Contacts.” Conversely these contacts are opened or broken when the relay is de-energized.

Back contacts of the relay on the other hand are “made” (closed) when the relay is de-energized and broken (open) when the relay is energized.

LINE RELAY: - This type of relay is used for classification of line. It gives signal to lines for up and down. There are two signals Red and Green. Here, red signal indicates that the line is busy whereas the green signal indicates that line is clear.

TRACK RELAY: - This type of relay is used for changing track at railway station. As we know only two lines up and down are present & number of lines are present at railway station.

KEYLOCK RELAY: - These are automatic relay & are used for the protection of accidents when train arrives & the gate is automatically closed. These all types of relays are controlled at control room

It is a process of mounting the

components on PCB Types Of Card Assembly-

1.Through Hole 2. Surface Mount Technology

In this process components are mounted through drilled hole on the PCB.

In this wave-soldering machine is used for Soldering Through Hole components

The process consisting of 4 sub process 1. Fluxing

2. Pre heating 3. Wave soldering4. Rework &touch up

Wave soldering is a large-scale soldering process by which electronic components are soldered to a printed circuit board (PCB) to form an electronic assembly.

The name is derived from the use of waves of molten solder to attach metal components to the PCB.

The process uses a tank to hold a quantity of molten solder; the components are inserted into or placed on the PCB .

The process is much faster and can create a higher quality product than manual soldering of components.

Surface mount technology (SMT) IS AN ELECTRONICS ASSEMBLY TECHNIQUE where Electronic components are mounted to the surface of printed circuit board without holes drilled through the board for insertion of component leads

This method is a very efficient and fast technology. It saves the cost of placing the component &time

about 30% more faster than the work power.

Surface mount assembly is basically a four-step process:-

1.Print the solder paste/ glue. 2.Place the components. 3.Reflow the paste to form the solder

interconnection between the component and the land area of the board.

4.Rework

1.Screen Printer- To print the solder paste / glue on the board .The places on the pcb where we want to fix the component is made shining by putting this paste.

We develop a program showing which component

it’s size, width,etc… Here the components are picked up and placed at

appropriate location. There are different nozzles as per the component.• They create a vacuum ,pick up the component and

place them on the PCB. Components are fed through three methods reel ,

tray & tube It’s speed of placing is 20,000 components per

hour.

Pick & mount machine

Here hot air comes

and melts the solder which grips the particular component.

There is a blower which cools the PCB when it is very hot.

ANY QUERY???....

THANK YOU

Presented by:

Pushpendra Singh Gurjar