EPS 2011-04

5-19

Installing and Connecting the HP Redundant / External Power Supplies

Installation Procedures

3. If you are connecting up to five units, attach backup power cables in the

same way between the other units to complete the backup power group.

4. (Optional) To form a closed loop or “ring,” connect a backup power cable

from the backup power “In” port on the last unit to the backup power

“Out” port on the first unit. See “EPS Backup Power” on page 5-31 for more

information on the ring topology.

When power is on for each of the HP 610 EPS units in the group, the EPS

Backup Power Port Status LEDs should go on to confirm that these ports are

functioning properly, and backup power is available to other units in the group.

If an EPS Backup Power Port Status LED does not go on when the backup

power cable is connected to the port, see Diagnosing with the LEDs in chapter

6, “Troubleshooting.”

To disconnect:

Unscrew the thumb screws on the plug and pull the plug out of the port.

Refer to “EPS Backup Power Port Operation” on page 2-6 for detailed infor-

mation and on backup power, and to “EPS Backup Power” on page 5-31 for

information on maximum available backup power.