foward reverse starter

MAKMAL ELEKTRONIK  Jabatan Pendidikan Kejuruteraan Fakulti Pendidikan Teknikal Experiment 2 : Foward Reverse Starter 1. AIM AIM -

To provide knowledge in Forward-Reverse Starter.

2. OBJECTIV OBJECTIVES ES

-

To familia familiarize rize the studen studentt with: with: 2.1

Control circuit and main circuit for Forward-Reverse Starter.

2.2

Operation in starting AC Motor with Forward-Reverse Starter.

2.3

Control equipment for Electrical Motor Control.

3. EQUIPMEN EQUIPMENT T LIST

3.1 3 Phase Contactor

2 units

3.2 Thermal Overload Relay (TOR)

1 unit

3.3 Push Button Start

2 units

3.4 Push Button Stop

1 unit

3.5 Miniature Circuit Breaker(MCB)

2 units

3.6 Mold Molded ed Case Case Circu ircuit it Brea Breake ker( r(MC MCCB CB))

1 unit nit

3.7 Pilot Lamp

3 units

3.8 3 Phase AC motor (3/4 ~ 3 hp)

1 unit

3.9 Cable

necessary

4. TH THEO EORY RY

This starter concept is same as Direct On Line Starter but Differ in terms of  motor rotation.

MAKMAL ELEKTRONIK  Jabatan Pendidikan Kejuruteraan Fakulti Pendidikan Teknikal Experiment 2 : Foward Reverse Starter 5. EXPERIMENT PROCEDURE 5.1 EXERCISE 1 : CONTROL CIRCUIT 5.1.1

Control circuit was connected as show in Figure 1(a) or 1(b).

5.1.2

This circuit become to single phase. The incoming voltage from 1 of 3 line was took (R or Y or B) for single phase.

5.1.3 Connect this line back to the neutral (N) by using black cable. 5.1.4 The circuit was tested with power supply to make operation of controlling circuit. 5.1.5 The operation of this control circuit was viewed.

MAKMAL ELEKTRONIK  Jabatan Pendidikan Kejuruteraan Fakulti Pendidikan Teknikal Experiment 2 : Foward Reverse Starter 5.2EXERCISE 2 : MAIN CIRCUIT 5.2.1 5.2.2

Connect the main circuit as shown in Figure 2. Incoming supply for this circuit is from 3 phase line 415 V(R,Y,B and

N) 5.2.3

Earth(E) was connected to the 3 phase motor ground by using green cable.

5.2.4

This circuit was tested with 3 phase supply to make full operation of  main circuit and controlling circuit to AC Motor.

5.2.5

The operation of this Forward-Reverse Starter were seen.

MAKMAL ELEKTRONIK  Jabatan Pendidikan Kejuruteraan Fakulti Pendidikan Teknikal Experiment 2 : Foward Reverse Starter 6. DISCUSSION 6.1The

experiment was succeed. This Forward-Reverse Starter can start the

machine in two ways, clockwise and anti-clockwise. When we push the stop button, it may stop working. 6.2

As the name suggests this motor starter is used where the motor needs to rotate

in both sides (Clockwise and Anti-Clockwise). Its operated with use of buttons. This starter provides complete protection from Overloading. It consists of two major components other than the enclosure. The components are called as Contactors and Overload Relay. We use very high quality alloys as contacts so that the precise and chatter-free operation is achieved. The Solenoid coils inside the contactors are machine-wound with use high-precision winding machine s. According to the experiment, it shows that the circuit was made in 3 phase. To make it reverse and forward situation, we have to connect only 2 connector in between forward’s and reverse’s TOR. It may happened between life reverseearth

MAKMAL ELEKTRONIK  Jabatan Pendidikan Kejuruteraan Fakulti Pendidikan Teknikal Experiment 2 : Foward Reverse Starter

6.3 Function of equipment list: