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3.
Plug the other end of the cable into a power source on separate circuits to protect against failure.
The power supplies power up as soon as they are plugged in.
NOTE
Power is supplied to the device as soon as the first power supply is connected and powered
on.
Connecting a power cord to a 500W DC power supply
Use the following steps to connect DC power cords to 500W DC power supplies.
1.
Remove the DC wiring assembly from the front of each DC power supply by loosening the two assembly screws.
FIGURE 62 DC wiring assembly and power source wires
1.
Wire tightening screws
2.
Loosen the wire tightening screws and insert wires from the DC power source into the wiring assembly. Connect the -48V
source cable to the negative terminal and the 0V cable to the positive terminal as marked on the harness assembly.
3.
Tighten the wire tightening screws and reinstall the wiring assembly onto the power supply.
4.
Tighten the assembly screws on the wiring assembly to secure it to the power supply.
5.
Connect the wires from the power supply wiring assembly to your DC power source.
NOTE
The equipment installation must meet NEC/CEC code requirements. Consult local authorities for regulations.
6.
Ground the chassis by attaching the ground wire from building ground to an appropriate crimp connector and attaching the
connector to a ground lug attaching screw located on the leftmost side of the nonport side of the device.
CAUTION
For a DC system, use a grounding wire of at least 12 American Wire Gauge (AWG). The 12 AWG wire should be
attached to an agency-approved crimp connector crimped with the proper tool.
NOTE
To ensure adequate bonding when attaching the ground lug, a minimum of 20 in-lb (2.76 Nm) of torque is required to
be applied to the mounting hardware used to attach the ground lug.
ExtremeSwitching VDX 6740 Hardware Installation Guide
9036108-00
2.
Assembly screws
Providing power to the device
87
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