5-45
Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide
OL-17440-01
Chapter 5 Maintaining the Router
Removing and Replacing the DC Power Shelf
Step 11
Power on the source DC circuit breakers for the PEMs.
Step 12
Verify the polarity and voltage readings across the pairs of positive and negative
terminal studs:
•
All voltage readings should be –48 to –60 VDC
Caution
If any of the voltage readings are not within the specified range, do not proceed.
Check for correct polarity and DC source voltage.
Step 13
Reinstall the power cable cover (
Figure 5-33
).
Figure 5-33
Reinstalling the Source DC Power Cable Cover
Step 14
Power off the source DC circuit breakers for the PEMs.
Step 15
Install all of the DC PEMs as described in the
“Removing and Replacing a DC
PEM” procedure on page 5-31
beginning with
Step 5
.
27219
Ground
–
+
Cover standoff
Cover with slotted screw hole;
fastens to standoff in middle
of cable connection area.