Problem in star delta starter in air compressor

Question

I am a beginner in electrical engineering. I am trying to understand how motors are connected in a star and delta system.

I studied the star delta starter from this link. It describes the connection of a motor connection as in following diagram.

Above diagram shows V1 and V2 connected to the same phase through the main contactor and delta contactor.

But, this diagram does not match my real wiring. It seems to be wrong.

What is the correct wiring scheme? Is there any problem with my connection or with the diagram in the link. I didn't check the winding of the motor. I trusted the tag on the wire.

Answer 1

Above diagram shows V1 and V2 connected to same phase through the main contactor and delta contactor. But,This diagram is wrong according to my real connection.

You are correct. The diagram is wrong.

Figure 1. Here is the same crude drawing but the phase sequence is correct and somebody has coloured it up. Source: Electrical Notes.

^{simulate this circuit – Schematic created using CircuitLab}

Figure 2. Drawing of your wiring looks OK.

I didn't check the winding of the motor. I trusted the tag on the wire.

Very foolish.

The panel wiring in your photo is atrocious. It needs a major tidy up.