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Do you supply the PSON# signal before or after the main power comes on, or before connecting the load? Looking at the datasheets, the correct sequence is VAC power on, then  PSON# signal to ground, then DC rails come on. Your load should be connected before PSON signal is taken to ground, because this power supply doesn't support hot plugging. Before disconnecting a load, you'll need to bring PSON up again/release it from ground.