What is motor connection diagram 302 in Nameplate details

What is motor connection diagram 302 in Nameplate details.

There are some standard motor terminal connections are there. The motor or generator manufacturer delivers the motor to their client with some standard terminal connection (CONNECTION DIAGRAM). It can be modified as per our requirement. Let see the type of motor connection are used. See the available terminal of the motor. Normally motor contains 6 terminal (1U,2U,1V,2V,1W,2W). One coil has two terminals


  1. Squirrel cage induction motor connection:

Connection diagram: 201

Star wound switching direct on to main terminal block with straight through connectors. In this, the terminal connection cannot be modified. We have to run a motor with the star connection only. One side of the three coil terminal fully brazed in motor itself (standard star connection). Star delta starter cannot be used. DOL, Auto transformer starter and VFD uses to start the motor. This type of connection is mainly used in less than 1 HP motor. Ex: small oil circulation pump, small chemical dosing pump etc.

Connection diagram 202:

Mesh (Delta) wound switching direct on to main terminal block with straight through connectors. The standard delta connection will be made within the motor itself. Terminal connection cannot be modified. Star delta starter cannot be used. DOL, Auto transformer starter and VFD uses to start the motor.

Connection diagram 301:

Star wound switching direct on to main auto transformer. In this type of connection, manufacturer brings All six terminal connection to the terminal block. The standard connection comes as shown in the figure. The connection can be modified as per our requirement. All kind of starter can be employed. This is very rarely used connection diagram. While using star delta starter and VFD bypass starter for this, you must remove the star link which given in the terminal block. You have to connect the power cable with terminal block phase bolt.

Connection diagram 302:

Delta wound switching direct on to main auto transformer. This is the best connection method of all. It can be modified as per our wish. All starter can be used. While using star delta starter and VFD bypass starter for this, you must remove the delta link which given in the terminal block.


Connection diagram 304:

This type of connection uses larger capacity of the motor and Frame size is more than 280. Most efficient type of connection, less maintained and hassle free connection. While using star delta starter the terminal must be identified carefully.

  1. Slip ring induction motor

Connection diagram 3MS:

This type of connection mainly used for slip ring induction motor. The motor stator wound with standard delta connection. The resistance will be in star connection.

All drawing:

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