Allied Telesis IE048-480, Installation Manual

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Chapter 1: Overview
24
TRM Screw for Adjusting the Output DC Voltage
The DC output connectors on the power supply have a power range of
45.0V to 55.2V. The default is 48V. You can adjust the output voltage with
the TRM screw on the front panel. Here are the guidelines:

A voltmeter is required to adjust the DC output power.

You should verify and adjust output power before connecting
powered devices to the power supply.

The TRM screw configures the voltages on both sets of DC output
connectors together. You cannot set the connectors separately.

Refer to the powered device’s installation guide for input power
requirements.