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Step
Task (continued)
Secure the chassis ground connection first:
5
Remove one outer nut and one washer from each of the six studs. One nut should remain, tighten on the stud to
a
20 in/lbs. If the inner nut is loose, re-tighten it to 25 in/lbs.
Locate the chassis ground connector studs on the PEM front panel (see
b
are the ground connection.
Install the grounding cable onto the ground studs. The grounding cable must comply with your local electrical
c
codes in size and color (typically the color is green or green with yellow stripe).
NOTE:
spacing (see
Replace the two washers and nuts on the studs.
d
With a 7/16-inch box or socket wrench, tighten the nuts (torque should not exceed 25inch/lbs).
e
Connect the opposite end of the grounding cable to the nearest appropriate facility grounding post.
f
Figure 8-4. Cable Connector Required for E1200 PEM
High-s trand-count
conductor
Connect the -48 VDC and Return cables from each PEM to the remote power sources (circuit breakers A and B).
6
Check that the remote power sources (for example, circuit breakers) are in the OFF position.
a
Locate the appropriate studs on the PEM front panel
b
The two leftmost studs on the PEM are the -48 VDC (-) connection. The cable attached to these studs is
c
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 should be of the size and color to comply with
d
local electrical codes.
NOTE: Power cables must be terminated only with a UL-listed 2-hole lug with 1/4-inch studs with 3/4-inch
spacing
(Figure
Replace the washers and nuts on the studs.
e
With a 7/16-inch box or socket wrench, tighten the nuts.
f
38
|
Installing DC Power Supplies
Grounding cables must be terminated only with a UL-listed 2-hole lug with 1/4-inch holes on 3/4-inch
Figure
8-4).
All meas urements s hown in inches .
8-6).
0.267
diameter
2 Holes
0.750"
(Figure
8-3).
Figure
8-3). The two rightmost studs
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