When you press red buttons it resets a contact which has opened.
I think you have found the problem with "Motor alarm led".The motor has tripped for some reason.It may reset,it may not.
Now press red buttons.
You can see red buttons in your post No5,bottom left picture.These are contactors in the picture and the bit with the button is an overload.Overload is a protection contact which senses the current going to the motor.If the current is excessive in one or more phases it opens a normally closed (NC) contact which opens the contactor (big power relay thing)
Are you connected to mains electricity?