18
Note 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 relatively safe indication of the polarity. However, you must
verify the polarity by measuring the voltage between the DC cable leads. When making the measurement, the positive
(+) lead and the negative (–) lead must always match the (+) and (–) labels on the power distribution unit.
•An earth ground cable is required for each DC PDU. We recommend that you use at least 6-AWG multistrand copper wire.
This wire is not available from Cisco Systems; it is available from any commercial cable vendor. The ground wire cable lug
should be dual-hole and able to fit over M6 terminal studs at 0.625 inch (15.88mm) centers. Recommended lug terminal
wire size Panduit part number:
–
LCD8-14A-L for 8AWG wire size
–
LCD6-14A-L for 6AWG wire size
Figure12 Cisco ASR 1006 Router DC Input Power Cable Lug
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.
Caution Before you connect DC-input power, you must install the DC power ground leads to the DC power supply.
Obtain these necessary tools and equipment:
•Number 2 Phillips screwdriver
•A 3/16-inch flat-blade screwdriver
Installing the Cisco ASR 1006 Router DC Ground Lugs
To install the grounding lugs on the DC power supply, follow these instructions. Figure11 (item #6) shows the location of the
DC power supply grounding stud.
Step1 Make certain that the chassis ground is connected before you begin installing the DC power supply.
Step2 Locate the stud on the DC power supply for the GND connection which must be connected first and follow these steps:
a. Using the grounding lug, replace the washers and Kepnut screw in the following order.
- Flat washer
- Grounding cable lug
- Kepnut screw
b. Tighten the Kepnut screws on the power supply studs.
Step3 Tighten the Kepnut screw (use the screwdriver to tighten the ground screw in the terminal block to a torque of
20+/–2 in-lbs / 2 per.) to complete the installation. Figure13 shows th e installed DC power supply ground stud.
Crimp area
25527
2.24
0.48
0.08
0.25 0.370.63
End View
Ø 0.267
2 holes
All measurements in inches