The meaning of your question is not obvious, but at no time would/should the phases be connected together. As amps is a measure of current, there would be nothing to measure between the phases.
A 3-phase motor will not run on single-phase power or if one of the three phases is disconnected. If the motor is not running, there is no back-EMF generated in the coils, and they draw excessive current, thus overheating.
Measure the current on the incoming side of the starter.
It is a measure of how many rpm the motor gains in one second while running up after being switched on.
Yes but it will not start. Usually if you lose one phase the current will go higher on the other phases and the motor overload protection will disconnect the motor from the supply voltage.
A three phase motor will not operate on single phase. The motor will run on two phases but will not start. Motors running on just two phases is called single phasing. The line current of the two legs will go high and it is this factor that the motor controller uses to trip the contactor to open the circuit and isolate the motor from the power source.
120 degrees
This question doesn't really make any sense - any of the two phase? A three phase induction motor requires 3 phases to start - if a single phase is lost while the motor is already running then yes the motor will continue to run. A three phase motor will not start if it is missing a phase.
If a three phase motor in running in reverse, then one of the phases is reversed, plain and simple. If the wiring is correct at the motor, perhaps the phase reversal occurred someplace else.
The capacitor is used to create a second phase from the single phase power source and it is the interaction between these two phases that causes the motor to turn.
230/400 V These motors can be connected in star to a mains of 400 V between the phases (see figure 1). figure 1 Star connection 400/695 V These motors should be connected in delta to a mains of 400 V between the phases (see figure 2).
in a delta configuration the current is split between the phases, as opposed to a wye configuration where the current will be equal on all phases. and vice versa for voltage.
The currents between legs of a three phase circuit should be within about 10% of each other.