Draw the Schematic Diagram of Dol Starter

Directly Online Starter[DOL Starter]

In this post, we are going to know the details of each role of DOL Starter Diagram. All parts of the DOL starter Power Circuit Diagram and Control Circuit Diagram are explained. Direct Online Starter or DOL Starter is very useful and unremarkably used AC Starter. DOL starters are mainly used with up to 5 H.P motors.

If you read the full article, so yous will understand the DOL Starter Working Principle.  I take explained the Working Principle of the DOL starter indirectly.

We know that electric Motors should not be continued to the supply direct for many important reasons which are already explained in our old article. We utilise unlike types of AC Starter for staring purpose of AC Motors.

The concept of a simple DOL Starter:

Within a DOL Starter

A simple DOL Starter has mainly two parts, one is Contactor and another is Thermal Overload Relay. The Contactor is used to switching purpose and the thermal overload relay is used to prevent overcurrent fault. The DOL starter cannot reduce the voltage or current during starting of the motor like other starters.

When we close the Contactor, the motor will get the ability supply and information technology will start. When the motor draws overcurrent, the thermal overcurrent relay will trip the circuit and the motor disconnect from the supply.

Really, the DOL Starter which is used with motor required additional circuits and equipment for its functioning. In the above paragraph, only the bones concept explained. Now we are going to know actually how the DOL starter is operated.

DOL Starter Circuit:

The whole DOL starter circuit is divided into two parts,

The connection or circuit to drive the motor is called Power Excursion and the connectedness or circuit to operate the DOL starter is chosen Control Circuit or Pilot Circuit.

Diagram of the DOL Starter Ability Circuit:

click on the epitome to enlarge

Power Circuit

As you see in the above figure the DOL starter has two parts,

In the power excursion, iii devices or equipment are continued. First the Main switch. We mainly use MCB as the Primary switch. Side by side, the Contactor is continued. The Overload Relay is connected afterwards the Contactor. The output of the Relay is connected to the Motor.

When we purchase any DOL Starter from the market, it has Contactor and Overload Relay within it. So we need extra MCB or Master switch which should be continued before the Starter. The DOL Starter including Control circuit also available in the marketplace.

In the power circuit, we tin can only operate the Chief switch or MCB and rest of all operations are done in the Command excursion.

Recollect that the power circuit contains the total voltage similar 230V for single phase and 440V for three phase supply but the control circuit always contains up to 230V single phase supply.

DOL Starter Command Circuit Diagram:

The all principal operations are done in the control circuit. The control circuit is connected to the Contactor Scroll. When the coil of the Contactor is energized then the Contactor closes the power circuit and the Motor gets the power supply. Then our main focus is to energize the coil of the Contactor. If y'all see the power excursion and the control circuit advisedly then you will empathize the performance of the DOL Starter.

click on the prototype to enlarge

As you lot see in the above diagram later on turning ON the MCB when nosotros push the Start push button switch the Contactor coil will be energized and the motor will first to run. Subsequently starting every bit the Contactor scroll is energized the Concord on contact will exist closed and information technology keeps ON the control circuit even after removing pressure on the Start Button switch.

You can meet the Overload Relay operated switch is connected in series with the circuit which is Usually Airtight. So when the motor draws overcurrent,  the relay operated switch becomes open and the Contactor also asunder the Motor from the supply.

The Overload indicator lamp is continued through an overload relay operated a switch which is Normally Open up so when the overload occurs then the Switch become closed and the Lamp will be glow.

We can stop the Motor someday by pressing the Finish push button switch which is Usually Closed.

Equally you see in the above figure the Power Circuit operating at 440V 3 phase supply and the control circuit is operating 230V single-phase supply.

Thank you for visiting the website. keep visiting for more updates.

Direct Online Starter[DOL Starter] Diagram Full Explained Reviewed by manoranjan das on two/16/2019 Rating: 5

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Source: https://www.etechnog.com/2019/02/dol-starter-diagram-and-working-explained.html

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