E.g. energy recuperation. A motor inverter can feed energy back to the DC bus, but not the mains supply. The energy can be consumed by another motor in a shared DC bus or must be absorbed by a breaking resistor circuit.
don't you think its because of the fact that if any one's power supply (DC Bus voltages are failed) then the other's power supply will make up the operation without any break ?
Depends on which failure mechanism you assume more likely, supply failure or failure of DC bus and inverter stage short. In the latter case, the parallel circuit will reduce reliability rather than improving it.
I don't think that higher reliablility is a premier purpose of the parallel circuit.
Depends on which failure mechanism you assume more likely, supply failure or failure of DC bus and inverter stage short. In the latter case, the parallel circuit will reduce reliability rather than improving it.
I don't think that higher reliablility is a premier purpose of the parallel circuit.
Parallel always make higher reliability. It does not just only connect wires in parallel it will have protection system (At least has a diode in serys), so if any one fail wil not effect the whole.
Parallel always make higher reliability. It does not just only connect wires in parallel it will have protection system (At least has a diode in serys), so if any one fail wil not effect the whole.
I see, that you didn't actually analyze (or at least not understand) the operation of the circuit under discussion. There's no way to protect it against bus shorts by series diodes. So a short of one bus capacitor or output stage will stop all connected drives.
That isn't a particular problem, because machine operation depends on availability of all drives. For the same reason, you would ususally generate an emergency stop if any of the supplying circuit breakers trips, presumed it's monitored by the machine PLC.