ITech IT6512D User Manual page 14

Inspection and Installation
Take the IT6522D model as an example, the power supply AC input
connecting as follows.
In the above illustration, one end of the AC power cord is connected to the
AC input terminal in the rear board of the power supply. Connect the fire
wire, zero line and ground to the corresponding terminal of the device.
Before inserting, please loosen the screw, lock the screw when it is
inserted.
Connect the three terminals red to line ( L), black to neutral ( N), and yellow
to ground ( G) on the other end of the power cord to your AC distribution
panel.

IT6532D-IT6537D Series power supply reserves an AC input interface for
single power supply unit. The user needs to insert it to the 380V
three-phase power supply. When it is inserted to the three-phase
distribution box, all AC power supply lines of the single unit should be
averagely connected to one phase of the three phases to meet the
220V±10% voltage input of each unit.
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