My friend and myself has a circuit on board which controls 3 phase 220V motor suitable for my need. My need was to start the motor manually. If the tank is full, the motor shouldn't start; otherwise the motor should run till the tank is full. I have attached circuit drawing. The left part in it is the circuit and right part is the circuit of a standard three phase motor.My friend had earlier connected the motor so that the need was met. Recently some fault was developed in the circuit and we have to do redo the wiring. I put in new demand on the circuit that if the circuit fails I should be able to switch on the motor. I have obtained three poles, double throw switch for this purpose on my friend's recommendation.
I feel that if the controlling circuit controls the starter's circuit as shown in the figure,it shouldn't need the switch. If the manual switch for the circuit is not operated, then starter controlling relay would be in "NO" position, and the starter would receive the power through the circuit,enabling operating starter manually.If the manual switch is pressed, the starter controlling relay would be either NO or NC positions, controlling starter.
WE DIFFER!
Have I given all information for any one to opine who is correct?
My friend has about 40 years of practical experience and I have none!
sureshparanjape