A SERVICE OF

logo

Open as PDF
next previous
Repair and Replacement 11-9
Replacing Parts
Figure 11-2 Removing a Line Module
Replacing a DC Power Entry Module
DC Power Entry Modules (PEMs) contain few active components so they should rarely need
replacement. Access is from the back of the node. To remove a PEM, proceed as follows:
Step 1 Check the node system voltage by using the Display Power (dsppwr) command. Note
which input has failed, A or B. Power Supply A is the unit on the right side facing the rear
of the node.
Step 2 Turn off the primary source of power to the PEM to be replaced.
Step 3 Turn off the circuit breaker on the PEM to be replaced.
Step 4 Remove the two screws holding the conduit box cover (see Figure 11-3). Or, remove the
plastic cover plate over the input terminal block.
Step 5 Remove the power input wiring at the PEM terminal block.
1
4
1
312
1
1
1
0
7
B
C
C
-A
8
B
C
C
-B
6
9
1
5
A
S
M
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
L
M
–
3
/T
3
5432
1
L
M
–
3
/T
3
L
M
–
3
/T
3
P
O
R
T
2
R
X
T
X
P
O
R
T
3
R
X
T
X
P
O
R
T
1
R
X
T
X
LM-3T3
(Typical)
Upper
extractor
Lower
extractor
Captive
screws
(2)
H8001