Motor starter for conveyor

[formach]

hello guys...

im now doing motor starter for conveyor..so i decide to use 4 magnetic contactor connected with overload relay each..1 contactor for main supply and i make some looping for other 3 contactor each contactor connected to one conveyor... it is 3 phase and 2 poles overload relay..im having some problem on the on/off switch button..right now if I am using push button..so everytime i want to on the conveyor i have to hold it to make sure its keep running..my problem is my boss want me to use different on/off button which mean 1 button on and 1 button off...so i can't figure out how the connection...plus i add one master switch...how can i make it happen?? i try to google the solution but still can't find any solution...so anyone reading this hope can help me..thank you

 

[Carl Pugh]

This is the circuit to use.
If 120 volt is removed and then reapplied, the conveyor doesn't start running.

 

[formach]

the motor using wye connection...from what i learned wye connection have neutral wire...so i have to use neutral wire too? because without the wire the conveyor still moving..