Cisco Systems Cisco 12008 manual Adding, Removing, or Replacing a DC-Input Power Supply

Adding, Removing, or Replacing a DC-Input Power Supply

Step 10 As an added safety precaution, it is recommended that you add a length of shrink tubing to the crimp area on each power cable lug (see Figure 7-5) before connecting the leads to the power supply.

The shrink tubing acts as an insulator to prevent the crimp area on the source DC power cable lugs from coming in contact with the faceplate of the DC-input power supply.

Step 11 Connect the source DC power leads to the terminals on the power supply faceplate. In so doing, strictly observe the following order in connecting the leads to the power supply:

(a)Ground

(b)+ (positive)

(c)– (negative)

Step 12 Using the lock washers and nuts removed from the terminals in Step 9, connect each power supply cable to the appropriate terminals on the power supply faceplate.

Observe the order shown in Figure 7-8 in connecting the source DC power cables to the terminals on the power supply.

Step 13 After installing each cable, securely tighten the associated lock washers and nuts on the power supply terminals using a 10 mm nutdriver (or a 1/4-inch socket wrench with a 10 mm deep-well socket).

Caution Do not overtighten the nuts on the power supply terminals.

Step 14 If you intend to attach an external alarm monitoring facility to the alarm terminal block on the power supply, connect the leads from the external monitoring facility to the circuit breaker alarm terminal block. Figure 7-9 shows an example of how these leads can be connected.

Maintaining the Cisco 12008 7-25