26 | Installing Power Modules
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6 Secure the chassis ground connection:
WARNING: You must complete the ground connection before proceeding with the PEM installation.
Locate the chassis ground connector studs on the PEM front panel (see
Figure 5-4
). The two studs on the upper left
are the ground connection.
Remove all nuts and washers from the two ground studs.
Apply a coat of anti-oxidant paste to the connector studs.
Install the grounding cable. This cable is typically green or green and yellow.
NOTE: Termination points require UL-listed 2-hole lug with 1/4-inch holes on 3/4-inch spacing.
Replace the two washers and nuts on the studs.
Secure the nuts with a nut driver or torque wrench (not to exceed 4 ft/lbs).
Connect the opposite end of the grounding cable to the appropriate nearest grounding.
7 Remove the outer nut and washer from each of the remaining studs.
8 Connect the -48 VDC and Return cables from each PEM to the remote power sources.
Verify that the remote power source is in the OFF position.
Locate the appropriate studs on the PEM front panel. The two top studs are the return (+) connection. The cable
attached to these studs is typically red. The two bottom studs on the PEM are the -48 VDC (-) connection. The
cable attached to these studs is typically black.
NOTE: Power cables must be terminated only with a UL-listed 2-hole lug to accommodate 1/4-inch studs
with 3/4-inch spacing.
Apply a coat of anti-oxidant paste to the connector studs.
Replace the washers and nuts on the studs.
Route the terminated cables out toward the rack rail (
Figure 5-4
).
Secure the nuts with a nut driver or torque wrench (not to exceed 4 ft/lbs).
Figure 5-4. DC PEM with Cables Installed
9 Replace the safety cover and tighten the captive screw with a #2 Phillips screwdriver.
10 Turn the Over Current Protector to the ON position (
Figure 5-4
).
11 Turn the remote power source (the circuit breaker panel) to the ON position.
Step Task (continued)
MAKE GROUND CONNECTION FIRST
CAUTION -
Use copper
conductors only
(-) -48V cable, typically black
Ground cable, typically green or
green with yellow stripes
() Return cable, typically red
Over-current protector switch
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