Alcatel-Lucent 7750 SR-a4, Руководство по установке, Страница: 183 / 232

Appendix C: Field-Replaceable Units
7750 SR-a4 and SR-a8 Installation Guide 183
Step 4. Slide the unit into the slot. Firmly press the PSU module all the way into the slot.
The latch (Key 3) clicks into place to secure the PSU when the unit is fully inserted.
Step 5. Attach the ground wire to the DC PSU ground if required by the local electrical
code. Do not over-tighten. Torque to 8-10 lbf-in (Key 1 in
Figure 65 ).
Figure 65: –48 VDC Ground and Power Connection
Step 6. Remove the safety cover from the three raised guides on the terminal block (Key 4
in
Figure 65 ).
Step 7. Remove the positive and negative terminal screws.
Step 8. Make the battery return ground connections.
i.
Attach the wire at the router end to the positive (+) battery return terminal on
the PSU (Key 2 in
Figure 65 ).
ii. Tighten the screw with a Phillips torque screwdriver. Do not over-tighten. The
recommended torque is 3 lbf-in (0.339 N
.
m).
Step 9. Make the connections to the disconnect device.
i.
Attach the battery wire at the router end to the negative (–) battery terminal on
the PSU (Key 3 in
Figure 65 ).
Table 93: –48 VDC Ground and Power Connection Descriptions
Key Description
1 DC power grounding terminal with M4 screw
2 Positive (+) terminal with M4 screw
3 Negative (–) terminal with M4 screw
4 Clear plastic sliding safety cover for the terminal block. The cover rests on
three raised guides to provide clearance for the cable connectors. During
installation, the cover can be removed temporarily to access the terminal
screws.
Pwr
S tat
+ -
24556
4
1
3 2