Allied Telesis IE048-480, Installation Manual

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IE048-480 Power Supply Installation Guide
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
Try replacing the powered device. If the new device works, than
the problem is with the first device.
Problem 4: A PoE switch powered by the IE048-480 Power Supply is not
supporting all its PoE devices. Possible causes are listed here:

The switch has a technical problem.

The PoE devices have a total power requirement that exceeds the
switch’s maximum power budget.

The power supply has reached its maximum output of 480W.

The power output on the DC output connectors needs to be
increased. Refer to “Adjusting the Voltage on the DC Output
Connectors” on page 54.

High ambient temperature caused the power supply to reduce
power on the DC Output connectors. Refer to “Derating Graph -
Operating Properties and Ambient Temperature” on page 70.
Solutions: Try the following:

Refer to the switch’s installation guide or product data sheet for its
maximum power budget for PoE devices. Calculate the total power
requirements of all the powered devices connected to the device
by referring to their installation guides. The switch cannot support
all the devices if its power budget is less than their total power
requirements. If this is the case, remove some powered devices
from the switch.

Refer to the switch’s installation guide or product data sheet for its
input voltage requirements. If it is greater than 48V, increase the
voltage on the DC output connectors on the power supply. Refer to
“Adjusting the Voltage on the DC Output Connectors” on page 54.

Calculate the maximum power consumption values of the powered
devices connected to the IE048-480 Power Supply. The value
should not exceed 480W.

Measure the ambient temperature of the site. Refer to “Derating
Graph - Operating Properties and Ambient Temperature” on
page 70.

Refer to the switch’s installation guide for more troubleshooting
suggestions for PoE devices.
Problem 5: A PoE switch suddenly stopped supplying power to one or
more powered devices. Possible causes of this state are listed here:

The DC power output has dropped on the DC output connectors on
the power supply.

The switch or powered device has a technical problem.