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Installation and Removal of the DC PEM
Note
The DC-input power cables must be connected to the PDU terminal studs in the proper positive (+) and
negative (–) polarity. In some cases, the DC cable leads are labeled, which is a safe indication of the
polarity. However, you must verify the polarity by measuring the voltage between the DC cable leads.
While measuring, the positive (+) lead and the negative (–) lead must always match the (+) and (–) labels
on the PDU.
•
An earth ground cable is required for each DC PDU. We recommend that you use at least 4-AWG
multi-strand copper wire. This wire is not available from Cisco; it is available from any commercial
cable vendor.
The ground wire cable lug (provided in the accessory kit) should be dual-hole, 90 degree tongue
(reference Panduit LCD4-14AF-L), and fit over M6 terminal studs at 0.625 inch (15.88mm) centers.
When you install the unit, the ground connection must always be made first and disconnected
Warning
last. Statement 1046
Caution
Before installing the DC cable lugs, ensure proper insulation of the entire 90 degree portion of the lugs
where the wire is crimped to avoid hazardous conditions and where the DC input power is accessible
through the terminal cover of the DC PEM with shrink tubing.
Caution
Failure to follow this procedure in the right sequence could pose a safety risk and cause damage to the
unit.
Note
To avoid hazardous conditions, all components in the area where DC input power is accessible must be
properly insulated. Therefore, before installing the DC cable lugs, be sure to insulate the lugs according
to the manufacturer's instructions.
Step 1
Ensure that the facility that feeds the DC -48V power supply to the chassis is turned off.
Step 2
Ensure that the breaker on the PEM power supply is turned off.
Step 3
Make sure that the chassis grounding is connected before you begin installing the DC power supply.
Step 4
Grasp the power supply handle with one hand. Place your other hand underneath it as you slowly insert
the power supply into the bay. Do not fully install the DC power supply to the midplane connector, leave
the power supply disconnected from the chassis by 1 inch.
Step 5
Locate the stud on the DC power supply for the GND connection, which must be connected first and
follow these steps:
a.
Using the provided grounding lug in the accessory kit, replace the washers and Kepnut screw in the
following order:
–
–
–
b.
Tighten the Kepnut screws on the power supply studs to the recommended torque of 18 in-lbs
minimum to 22 in-lbs maximum.
Cisco RF Gateway 10 Hardware Installation Guide
5-4
Washer
Grounding cable lug
Kepnut screw
Chapter 5
Installing and Removing FRUs
OL-16264-04
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