AXP1620 Installation and Use (6806800E23E
)
AXP1620 Shelf Installation
Connecting the Cables to the PEM
88
5.9
Connecting the Cables to the PEM
In a redundant configuration, each PEM must be connected to a separate DC power source.
Power is introduced to each PEM’s terminal block on the front of the module (power input cable
and return cable). The lugs provide secure contact for the cable and prevent the power cables
from rotating. A plastic housing covers the power feeds and returns and is attached with one
screw. Refer to
Figure 5-4 on page 87
for detail.
Procedure
Have the following tools on hand before you begin these steps: standard Phillips screwdriver,
nut driver, torque wrench, multimeter, and lug kit.
1.
Locate the target power input cable’s terminals at the branch circuit or power
distribution unit. Open the external circuit breakers that provide DC feed power to
the PEM.
2.
Lock and tagout the circuit breakers on the branch circuit or power distribution unit.
3.
Using the appropriate tool, carefully remove the plastic covering over the terminal
blocks.
4.
Confirm that there is no power to the PEM lug bolts. Using a multimeter, measure
between the two lugs and then measure between the chassis ground and each lug.
If the DC potential is 3.0VDC or less, then power is not present.
5.
Attach the DC power cables (input and return) to the dual lug bolts on each PEM.
To cable a dual breaker DC system, read all cautions and warnings, properly ground
the equipment by following the procedure in
Grounding the Shelf
on page 85
, and
follow these steps. This procedure assumes that the PEMs are preinstalled in the
shelf.
Cables may or may not be preinstalled at the branch circuit or power distribution unit.
If the DC power cables are not connected to the branch circuit or power distribution
unit, connect the power cables to the PEMs before connecting the DC power cables to
the external power source.
If the DC power cables are connected to the branch circuit or power distribution unit,
a qualified service person must confirm that the power to the cables is terminated (off)
before continuing the steps to attach the cables to the PEMs.
In either case, use a multimeter to check the PEM end of the terminals to confirm there
is no power present.
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