Installation guide

Connecting Protective Earth Ground and External Power to the Shelf

Chapter 4

Connecting the Power and Return Cables

WARNING Ensure that each power domain supply circuit breaker is switched OFF while

completing the following power connection procedure. Failure to comply can result

in personal injury.

To connect external power and voltage return (VRTN) leads to the 14-Slot Shelf, complete the following steps:

Step 1. On the rear of the 14-Slot Shelf, remove the PEM A Terminal Block Cover and connect the four

PEM A independent domain power cables and four return lines as shown in Figure 4-4. The four

cables and terminals on the left are the power domain leads, and the four cables and terminals on

the right are the return lines for the PEM.

Figure 4-4 PEM Power Lead and Return (RTN) Connections

CAUTION Make certain to connect matching power supply domain 1 lead to power domain 1

terminal lug on the PEM, matching lead 2 to terminal lug 2, and so on. Also ensure

that power domain VRTN lines are matched to respective connections on each PEM.

See Figure 4-4 and Figure 4-5.

NOTE In a typical telecommunications environment, the VRTN path of the -48 VDC supply

is grounded to protective earth (PE) of the building.

Step 2. Replace and secure the PEM A terminal block cover when all power leads and VRTN lines have

been attached.

Step 3. Remove the PEM B terminal block cover (see Figure 4-5) and connect the four PEM B independent

domain power leads and VRTN lines from the redundant power supply, using the same procedure

as above, for PEM A.

Return Cable

(Black)

Power Lead

Cables