DC Power Connections
7705 SAR-8 Installation Guide Page 93
Required tools and hardware:
• one or two DC power wiring harnesses (two harnesses are required for redundant
power configurations)
• torque driver for slot screws
For -48 VDC installations
Follow these steps to wire and connect –48 VDC power feeds (see Figure 23):
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 23, key item 5).
Attach the black lead (+VDC) on the power harness to the positive terminal on the
power source.
Step 3. Make the battery connection(s) to the disconnect device (Figure 23, key item 1).
Attach the blue lead (-VDC) on the power harness to the disconnect device.
Attach the other side of the disconnect device to the negative terminal of the power
source.
Step 4. For redundant supply configurations, repeat Steps 1 and 2 for the other power
harness.
Step 5. Check that the DC supply wiring is correct.
Step 6. Attach the connector on the power harness to the D-Sub 2W2 connector on the
7705 SAR-8.
Step 7. Install the other 7705 SAR-8 components. See Installing the Components.
Table 20: Wiring the DC Power Supplies Descriptions
Key Description
1 Disconnect device
2 DC source A
3 DC source B
4 Battery wire
5 Battery return wire
Note: Ensure that the leads on the DC power harness are prepared according to local safety
practices.
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