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The OnBoard appliance comes with either one or two power supplies. When the OnBoard appliance has two power supplies, connect each power supply to a separate power source for redundancy in case one power source fails. The power sources must be independent of each other and must be controlled by separate circuit breakers.
2. Plug the power cord(s) into the OnBoard appliance and plug the other end(s) into an appropriate grounded power source(s).
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.
c. Loosen the hex screw labeled with the ground symbol, attach a green grounded wire to the screw and tighten the screw again.