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If the two phases are 180o out of phase (split phase system), then yes. The resulting voltage will be around 240VAC, so it can be used with power supplies that has input range of 200VAC-240VAC.
If the two phases are 120o out of phase, the resulting RMS voltage will be 208VAC, so it should work, but derating might be needed on some models.
For a single-phase operation, you should check the input range of the power supply in its datasheet (derating might be necessary at low input voltage).
For a 3 phase PSU, the input port L1 L2 L3 and FG should be connected to AC phase R, S, T and PE respectively. In some cases, neutral might be needed and can be configured as below:
The same configuration can also be used if one want to use multiple single phase power supply for three phase connection.
For specific power supplies i.e., 3 phase power supplies with a lower power, a dual phase operation is possible by directly connecting the 2 phases to two of the three input ports of the power supply.
DC input can also be used by applying the positive wire to any of the input ports, and the negative one to another. In both cases, derating may be needed. (e.g., TDR series)
