The MAX79356 ZENO can interface with a three-phase system. The system will need line drivers for each phase, and the MAX44211 is the recommended part for the task. There are different configuration methods for systems with or without neutral lines. Those methods are detailed below:
1) With Neutral Line
A three-phase system with a neutral line has three hot lines and a single neutral line common to all three. To connect this type of system to ZENO, use three line drivers in parallel. See Figure 1 below.
Figure 1: Three-Phase, Common Neutral
2) Without Neutral Line
A three-phase system without a neutral line still requires three line drivers, but the connection scheme changes. The transformers at the output of the MAX44211 line drivers must instead be connected in a delta configuration. Special consideration should be taken to make sure all components connected to the right of the line driver are capable of handling the voltage differences between phases. See Figure 2 for details.
A three-phase system without a neutral line still requires three line drivers, but the connection scheme changes. The transformers at the output of the MAX44211 line drivers must instead be connected in a delta configuration. Special consideration should be taken to make sure all components connected to the right of the line driver are capable of handling the voltage differences between phases. See Figure 2 for details.
Figure 2: Three-Phase, No Neutral, PLC Between All Phases
Another way to accomplish PLC over a three-phase system without a neutral line is by using a single line driver connected between two phases. Again, special consideration should be taken to make sure all components connected to the right of the line driver are capable of handling the voltage differences between phases. See Figure 3 for this method.
Figure 3: Three-Phase, No Neutral, PLC Between Two Phases