I have a square D quick connect transformer in a control box system connect to the vacuum pump. The input supply for the primary side of the transformer is 220V. The output side is 110V. When i place the multimeter probe on the input side terminals, i get a voltage reading of 210V. When i do the same thing on the output side, i get 110V. This would suggest that the transformer is working alright. However, when i do the multimeter reading with respect to ground, the whole thing changes. I get a reading of 120V for the input terminals with respect to the ground and i get 0V for the output terminal with respect to ground. Do you think this is normal? Then, i used a electric tester with the input supply on and the output terminals disconnected and open. In this case. i had light ON in both the input terminals. In the case of output terminals, the light was ON only on one of the terminal and not in the second one. What do you think would be going wrong?
I have attached the picture of the circuit which consist of a relay, transformer and contactor (starter). It is a control box of a vacuum pump. There is a remote start/stop button outside which is used to start the pump. The problem is pump does not start after pressing the start button. However, if i manually push the contactor, it goes in and the pump starts. This indicates there is a problem in the control circuit which consist of transformer and relay. Any guides on how should i troubleshoot the problem? I do not have a wiring diagram for this circuit.