ITech IT7900P Series User Manual page 27

The yellow-green wire is grounding wire, which is connected to the PE terminal
of power input on the rear panel; the others are live wires, which are
correspondingly connected to the L1, L2 and L3 terminals of power input on the
rear panel of the instrument.
AC Power Input Level
The AC input of this series is a three-phase AC power (three-phase four-wire)
by default, and the model of 3kVA and 5kVA power supply can support single
phase AC power input. The detailed specifications refer to Technical
Specifications.
Please pay attention to the AC input voltage level:
Connecting the Power Cord
⚫
please take care for balanced current distribution on three phases. For single
unit, it supports single phase input, and it requires single phase or three phases
of AC distribution box (the rated AC current on L3 is 0, so, it can be connected
or not). In case multiple units are connected to the same main AC distribution
box. It is recommended to follow the suggestion connection diagram as below.
Single phase input connecting:
Multiple power supplies connect to three phase input:
NOTE
IT7930P-350-180 is standard equipped with two power cords.
NOTE
When the AC input voltage of 5kVA and 12kVA or above are in the range
of 190V-240V, the power setting value is derated to 60%, and when the
output exceeds the present rating, the instrument enters AC Input
Overcurrent protection and the output is turned off. If a full power output
is required, the AC input level Voltage must be greater than 240V.
When connecting the instrument which rated power is 5kVA
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Installation
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