Dell Force10 E300 Quick Start Manual page 21

WARNING: An external disconnect shall be provided and shall be easily
accessible. Dell Force10 recommends that you use a 150A circuit breaker.
Use the following steps to install a DC PEM:
Step Task
Make sure that the remote power source (the circuit breaker panel) is in
1
the OFF position.
Make sure that the over-current protector (located on the PEM front
2
panel) is in the OFF position.
Loosen the retaining screw and remove the PEM safety cover.
3
Slide the PEM into the 0 or 1 slot:
4
Lift up and hold the PEM interlock lever and carefully push the unit
a
inward to fully seat it to the backplane. When the PEM is fully
inserted, the interlock lever will drop to hold the PEM in position.
Tighten the two locking screws with a #2 Phillips screw driver to
b
secure the PEM. Do not exceed 5 inch/lbs torque.
Connect the -48 VDC and Return cables from each PEM to the remote
5
power sources (circuit breakers A and B).
Check that the remote power sources (for example, circuit breakers)
a
are in the OFF position.
Locate the appropriate studs on the PEM front panel.
b
The two left most studs on the PEM are the -48 VDC (-) connection.
c
The cable attached to these studs is typically black. The two middle
studs are the return (+) connection. The cable attached to these studs
is typically red.
Install the -48 VDC and Return cables on the studs. The cables
d
should be of the size and color to comply with local electrical codes.
Replace the washers and nuts on the studs.
e
With a 7/16-inch box or socket wrench, tighten the nuts.
f
Route the terminated cables down and toward the rack rail.
6
Replace the safety cover and tighten the captive screw with a #2 Phillips
7
screwdriver.
NOTE: Power cables must be terminated only with a UL-listed 2-
hole lug with 1/4-inch studs with 3/4-inch spacing.
Installing the Hardware
19