Alcatel-Lucent 7750 SR-a4, Installation Manual, Page: 105 / 232

Installing PSUs
7750 SR-a4 and SR-a8 Installation Guide 105
Required tools and hardware
• three lengths of #8 AWG wire: one length for the ground and two lengths for the
battery cables, prepared as described in
Preparing the PSU Ground and Power Cables
on page 101
• Phillips torque screwdriver
To connect the –48 VDC power feeds:
Step 1. Ensure that all power to the router at the remote DC power source is OFF.
Step 2. Attach the ground wire, if required by the local electrical code.
i.
Run a length of ground wire from the appropriate grounding point to the router.
ii. Prepare the end of the wire at the ground point according to local safety
practices and attach it to the grounding terminal.
iii. Prepare the end of the wire at the router by attaching a ring lug, as described in
Preparing the PSU Ground and Power Cables on page 101 .
iv. Attach the ring lug on the ground wire to the DC PSU ground (Key 1 in
Figure 31 ).
v. Tighten the M4 screw. Do not over-tighten. Torque to 8-10 lbf-in.
Step 3. Remove the safety cover from the three raised guides on the terminal block (Key4
in
Figure 31 ).
Step 4. Remove the positive and negative terminal screws (Keys 2 and 3 in Figure 31 ).
Step 5. Make the battery return connections.
i.
Run the length of wire from the power source positive terminal to the terminal
block on the router.
ii. Prepare the end of the wire at the power source according to local safety
practices and attach it to the power source positive terminal.
iii. Prepare the end of the wire at the router by attaching a ring lug, as described in
Preparing the PSU Ground and Power Cables on page 101 .
iv. Attach the wire at the router end to the positive (+) battery return terminal on
the PSU.
v. Replace and tighten the terminal screw using a Phillips torque screwdriver. Do
not over-tighten. The recommended torque is 3 lbf-in (0.339 N
.
m).
Step 6. Make the battery connections to the disconnect device.
i.
Run a length of wire from the disconnect device to the router.
ii. Prepare the end of the wire at the router by attaching a ring lug, as described in
Preparing the PSU Ground and Power Cables on page 101 .
iii. Attach the battery wire at the router end to the negative (–) battery terminal on
the PSU.