Troubleshooting Power Supply Installation Alarms On Ex4200 Switches; The Switch Displays The "Unsupported Psu" Alarm - Juniper EX4200 Hardware Manual

Troubleshooting Power Supply Installation Alarms on EX4200 Switches

This topic provides troubleshooting information for problems related to power supply installation on
EX4200 switches.

The Switch Displays the "Unsupported PSU" Alarm | 248

The Switch Displays the "Unsupported PSU" Alarm
Problem
Description: The "Unsupported PSU" alarm appears on the EX4200-24PX or the EX4200-48PX switch.
Symptoms:
A 930 W AC power supply is installed in the switch, but no power is detected on PoE+ ports.
The Alarm (ALM) LED lights red and when you check the alarm status using the show chassis alarms
command, the "Unsupported PSU" alarm is displayed as shown below:
user@switch> show chassis alarms
1 alarm currently active
Alarm time
2011-02-14 08:34:39 UTC
Cause
The power supply you have installed is not compatible with the switch.
EX4200-24PX and EX4200-48PX switches do not support the 930 W (EX-PWR-930-AC) or the 600 W
(EX-PWR-600-AC) AC power supplies that are used in the EX4200-48P and the EX4200-24P switch
models. EX4200-24PX and EX4200-48PX switches work only with the power supplies labeled
EX-PWR2-930-AC or EX-PWR3-930-AC. All EX4200 switches support EX-PWR2-930-AC and
EX-PWR3-930-AC power supplies.
Solution
Check the label of the power supply you have installed in the switch. You can find the label on the top of
the power supply (see "Removing a Power Supply from an EX4200 Switch" on page
incompatible power supply, remove it and install the correct power supply.
Class Description
Unsupported PSU
195). If it is an
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