Wiring and Connecting DC Power
80 7705 SAR-A Chassis Installation Guide
Required tools and hardware:
• two or four lengths of wire (two lengths per supply)
• wire cutter
• wire stripper
• torque driver for slot screws; No. 2 slotted blade width, 0.125 in (3.2 mm)
Follow these steps to wire and connect –48 VDC power feeds (see Figure 18):
Step 1. For CBN installations only, ensure that the positive terminal on the DC power
source is connected to ground.
Step 2. Make the battery return ground connection(s) (Figure 18, key item 7):
i. Run a length of wire from the power source positive terminal to the terminal 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 (see Figure 17).
iv. Attach the battery return wire to the +Batt return terminal on the router. Tighten
to a torque of 3.54 to 4.42 lbf-in (0.4 to 0.5 N
.
m) maximum.
v. For redundant power supply configurations, repeat substeps i to iv for the
other battery return wire.
Step 3. Make the battery connection(s) to the disconnect device (Figure 18, key item 3):
i. Run a length of wire from the disconnect device to the router. Prepare the router
end of the wire (see Figure 17). Prepare the wire at the disconnect device
according to local safety practices.
6 Battery wire
7 Battery return wire
8 Tightening screw
9 Wire receptacle
Table 18: Wiring the DC Power Supplies Descriptions (Continued)
Key Description
Note: The minimum AWG power conductor for the DC input connections must be based on
the application, and on the local codes, practices, and regulations applicable for the region.
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