Compare the two circuits below. What is the major difference between them? Circu

Question

Compare the two circuits below. What is the major difference between them?

Circuit 1:

Circuit 2:

slip Ring and Brush Phase Winding OL. Note: Rae winding includes Windings motor windingto OL Slip Ring and Brusb Fuse Fuse variable DC Power TD Circuit connected to the secondary of the transformer (lower portion) is for control purpose. Explanation of the symbols TD: On Delay Timer. After a preset time delay the TD contacts supply power to the DC rotating magnet. Auxiliary Contacts, One Normally open and One Normally Closed Motor MI Starter Coil Overload Heaters Leads Three from Leads to Power Motor Supply Auxiliary Overload. Contact The function of each of the parts is as follows 1) Power is supplied to the M coil through the A1, A2 terminals. 2) All of the M contacts change state, the three main contacts close, and the two smaller auxiliary contacts change. The Normally open (NO) contact closes, and the Normally closed (NC) contact opens. 3) If there is power at the LI, 12, 13 terminals the TI, T2, T3 terminals become energized through the main M contacts. 4) If there is a motor connected to the T terminals, current flows to the motor and causes it to develop torque and start turning 5) The current will cause the Overload Heaters to get warm. 6) If too much current flows to the motor for too long ofa time, the now hot overload heaters will cause the overload Contact to open.

Explanation / Answer

Star-Delta starter This circuit is used to decrease the starting current by one-third of the original current It is costly circuit This circuit first connect any motor in star at the time of starting then at the time of running it connect in the delta connection This circuit is used for operation between 5 Hp to 20Hp Auto-trsnsformers starter This circuit decrease the starting current as per the requirement It is more costly than the star-delta starter It connect any motor from the tapping taken out from the auto-transformers This circuit works above 20 Hp applications

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