Installation Guide

2. Plug the DC cable connector into the DC power supply socket on the rear of the EPS-150DC unit.
The pins must align properly for the cable to completely connect. Do not force the cable into the
socket until the keyway is aligned properly. Refer to Figure 296 on page 368 for the DC wiring
harness connector and to Figure 297 for the DC power socket location on the rear of the EPS-150DC
unit.
Figure 297: Connecting the Input Cable to the EPS-150DC Unit
3. Tighten the retainer nut on the connector until it is finger tight.
Connecting the EPS-150DC to a Switch
If you are connecting the EPS-150DC unit to a Summit X450a-48tDC switch, you must ground the
switch before connecting power. For instructions on grounding the switch, see Grounding a Summit
X250e or X450a DC-Powered Switch on page 329.
Warning
Always be sure that the DC circuit is de-energized before connecting the EPS-150DC to the
switch.
One end of the EPS-150DC cord has a keyed connector to ensure correct alignment of the connector.
The key is a plastic tab on the connector housing that fits into the EPS-150DC unit.
Figure 298: EPS-150DC Redundant Power Cord with Connector Key
To connect the EPS-150DC to a switch:
1. Verify that the DC power is turned o at the source.
2. Identify the keyed end of the redundant power cable.
3. Holding the keyed connector so that the side labeled “Top” is facing up, connect the EPS-150DC
redundant power cable to the power supply unit (see Figure 299 on page 370).
4. Align and tighten the connector retaining screws to secure the cable connector to the power supply
unit.
5. Connect the other end of the redundant power cord to the Extreme switch.
The connector fits the slot in only one direction.
Installing External Power Supplies
Installing the EPS-150DC Power Supply
Summit Family Hardware Installation Guide 369