
Chapter 2: Basic Installation Procedures 11
To connect DC power terminal blocks to a DC power source and power up:
1. Make sure the SP manager’s power switch(es) are off.
2. Perform the following steps twice to wire both terminal blocks to independent power sources.
a. Loosen the hex screw labeled RTN, attach the red wire (positive) from the DC power
supply to the screw and tighten the screw again.
b. Loosen the hex screw labeled
-48VDC, attach the black wire (return) from the DC power
supply to the screw and tighten the screw again.
Figure 2.3 illustrates the red wire connected between the positive connector and the RTN
screw and the black wire connected between the negative connector and the
-48VDC screw.
Figure 2.3: Wiring the DC Power Terminal to Positive and Negative DC Power Connectors
c. Loosen the hex screw labeled with the ground symbol, attach a green grounded wire to the
screw and tighten the screw again.
DC Power Source
RTN
-48vdc
-48vdc
+25%
- 36%
6a
Black Wire
- Negative
+ Positive
Red Wire
-48VDC Screw
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