EPS 2011-04

2-5

Introducing the HP 610 Redundant and External Power Supplies

EPS Port Operation

Power Connector

The HP 610 EPS does not have a power switch; it is powered on when

connected to an active AC power source. The HP 610 EPS automatically

adjusts to any voltage between 110--240 volts and either 50 or 60 Hz. There are

no voltage range settings required.

In addition, the HP 610 EPS may be powered on when receiving power

through a backup power port even when not connected to an active AC power

source.

Caution For safe operation of the HP 610 EPS, use only the AC power cord that is

supplied with it.

EPS Port Operation

The HP 610 EPS supports four EPS ports that can provide PoE power to HP

PoE switches through EPS cables. Each external power supply unit can

provide PoE power to a switch as a primary source or as a backup to a switch

that has its own internal PoE power supply.

The EPS ports operate as a pair. The HP 610 EPS has two pairs of EPS ports,

each of which can provide up to 408 W of PoE power at -50 VDC. There are

four possible power allocations for each EPS port pair:

■ Maximum power allocated to the first port and none to the second

■ Maximum power allocated to the second port and none to the first

■ Each port in the pair are allocated half of the maximum power

■ No power allocated to either port in the pair

For example, the HP 610 EPS can allocate all 408 W of power to port A1 (in

pair A) and none to port A2, or each port can be allocated 204 W.

If power is shared between the two EPS ports, current limits are set to prevent

an over-current condition. An over-current condition causes the port power

to be shut down. Also, EPS power may not be delivered if a connected switch

has not successfully requested EPS power. Lastly, if the internal EPS power

supply in the HP 610 EPS fails, EPS power will be lost unless backup power

is provided from another HP 610 EPS in a backup power group. See “Recom-

mended Connection Topologies” on page 5-26.