ITech IT-M3900D Series User Manual page 34

AC Power Input Level
This series 1U models support single-phase or three-phase AC input, and 2U
models support three-phase AC input. Please refer to the corresponding specifi-
cation for the voltage level range and frequency. In addition, the Output DC
power will be derated when the instrument is AC input at a low-grade voltage.
The derating formula is as follows.
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Connecting the Power Cord
Wiring Diagram:
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Single-phase utility, the Output DC power limit is, P = phase voltage * maxi-
mum input current * efficiency.
Three-phase utility, the Output DC power limit is, P = line voltage * maximum
input current * efficiency * 1.732.
When the 1U and 2U models are connected to three-phase power, the wir-
ing diagram is shown below.
When the 1U model is connected to single-phase power (L/N), the wiring di-
agram is shown below.
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Inspection and Installation
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