Maintaining the Cisco12008 7-25
Adding, Removing, or Replacing a DC-Input Power Supply
Step10 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 Figure7-5) 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.
Step11 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)
Step12 Using the lock washers and nuts removed from the terminals in Step9, connect
each power supply cable to the appropriate terminals on the power supply
faceplate.
Observe the order shown in Figure7-8 in connecting the source DC power
cables to the terminals on the power supply.
Step13 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.
Step14 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.