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Chapter 5
Installing and Removing FRUs
Blank faceplates and cover panels serve three important functions: they prevent exposure to
Warning
hazardous voltages and currents inside the chassis; they contain electromagnetic interference
(EMI) that might disrupt other equipment; and they direct the flow of cooling air through the
chassis. Do not operate the system unless all cards, faceplates, front covers, and rear covers are
in place. Statement 1029
Installing a DC PEM
This section describes how to install a DC PEM.
Before performing any of the following procedures, ensure that power is removed from the
Warning
DC circuit. Statement 1003
A readily accessible two-poled disconnect device must be incorporated in the fixed wiring.
Warning
Statement 1022
This product requires short-circuit (overcurrent) protection, to be provided as part of the
Warning
building installation. Install only in accordance with national and local wiring regulations.
Statement 1045
Warning
Use copper conductors only. Statement 1025
Warning
When stranded wiring is required, use approved wiring terminations, such as closed-loop or
spade-type with upturned lugs. These terminations should be the appropriate size for the wires
and should clamp both the insulation and conductor. Statement 1002
To install a DC PEM, connect it to a power source, and verify its operation, do the following:
Before proceeding, read the following instructions:
•
•
OL-16264-04
The color coding of the DC-input power supply leads depends on the color coding of the DC power
source at your site. Typically, green or green/yellow is used for ground (GND), black for –48V on
negative (–) terminal and red for RTN on the positive (+) terminal. Ensure that the lead color coding
you choose for the DC-input power supply matches the lead color coding used at the DC power
source.
For DC-input power cables, select the appropriate wire gauge based on the National Electrical Code
(NEC) and local codes for 60-amp service at nominal DC-input voltage (–48 VDC). Two pairs of
cable leads - source DC (–) and source DC return (+), are required for each Power Distribution Unit
(PDU). These cables are available from any commercial cable vendor. All input power cables for the
chassis must have the same wire gauge and the cable lengths must match (with a 10 percent
deviation). Each DC-input power cable is terminated at the PDU by a cable lug (included in the
accessory kit). The cable lugs must be dual-hole, and have a 90 degree tongue (reference Panduit
LCD4-14AF-L). They must fit over M6 terminal studs at 0.625-inch (15.88-mm) centers.
Installation and Removal of the DC PEM
Cisco RF Gateway 10 Hardware Installation Guide
5-3
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