External-To-Internal Psu Transfer; Disconnecting The Eps-C/Eps-600Ls - Extreme Networks Summit X150 Series Hardware Installation Manual

Summit Power Supplies
Two or Three EPS-600LS Modules.
EPS-C is connected and providing stable power from two or three EPS-600LS power modules, the PoE
power budget is automatically recalculated to enable 740 W of PoE power. The internal PSU is disabled
to prevent damage from excessive current demands beyond the capabilities of the internal PSU.

External-to-Internal PSU Transfer

This section describes what happens if power from an external power module either fails or is
disconnected.
Active Internal PSU with Single 600-LS Module Failure.
module is connected to the Summit X450e-48p or X250e-48p switch and the EPS-600LS fails or is
disconnected, power is drawn from the internal PSU without power interruption to the PoE-connected
devices.
Inactive Internal PSU with a Dual EPS-600LS Configuration and Module Failure.
chassis with two EPS-600-LS power modules, It is possible for one external power module to fail while
the second power module continues to function. If one EPS-600LS fails, the PoE power budget is
automatically reduced to 370 W for the Summit X450e-48p or X250e-48p switch. PoE port power
management occurs as described in the Power over Ethernet section of the ExtremeXOS Concepts Guide.
With only a single operating power module, the remaining EPS-600LS behaves as a redundant power
module. The internal PSU is returned to an active state to provide redundant capability.
If both external power modules fail or are disconnected, PoE power is interrupted while transferring
PoE power back to the internal PSU. The internal PSU is then limited to 370 W of PoE power. The PoE
power budget is automatically adjusted accordingly. Power management will occur as described in the
Power over Ethernet section of the ExtremeXOS Concepts Guide.

Disconnecting the EPS-C/EPS-600LS

To manually disconnect an EPS-C or to remove the EPS-600LS modules, the recommended practice is to
disconnect the EPS-600LS modules one at a time, pausing two seconds after each EPS-600LS disconnect.
This enables a graceful power transition from the external PSUs to the internal PSU.
Example: Two active EPS-600LS modules in an EPS-C
a Unplug one EPS-600LS unit from its power source.
PoE power is automatically reduced to 370 watts and the internal switch PSU is enabled,
providing redundant 370 watt PoE power.
b Wait at least two seconds before disconnecting the remaining EPS-600LS unit.
c Unplug the second EPS-600LS unit from its power source.
The internal PSU is already enabled and provides uninterrupted 370 watts of PoE power.
NOTE
After an EPS-600LS unit is disconnected from its power source, it may be removed from the EPS-C.
See "Removing an EPS-600LS Power Module" on page 255
d Disconnect the EPS-C from the switch.
98
When the Summit X450e-48p or X250e-48p switch detects that an
When an EPS-C with a single EPS-600LS
Summit Family Switches Hardware Installation Guide
In an EPS-c
for disconnection and removal instructions.