H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 32)

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Figure 18 Appearance of DC power cables
1: OT terminal-OT (6mm2-M4-tinned-OT terminal-12~10AWG)
2: Heat-shrinking tube
3: Label 1 (+)
4: Electronic power cable (600V-UL10455-5.3 mm2-10AWG-black-45A)
5: Main label
6: Heat-shrinking tube
7: Electronic power cable (600V-UL10455-5.3 mm2-10AWG-blue-45A)
8: Label 2 (–)
9: Common terminal – cold-pressed terminal (6 mm2-0.02m-30A-insertion depth 12mm-black)
The format for calculating the sectional area of DC power cables is S=2 × I × L/(57 × ΔU).
Where:
• I is the load current, in units of A.
• L is the cable length, in units of m.
• ΔU is the voltage drop between the power distribution frame (PDF) and the access controller, which
is typically 3.2 V.
• S is the sectional area of the cables, in units of mm 2 .
Follow these steps to connect the AC power cables for a DC PSU:
Step1 Set the power switch on all the DC PSUs to the OFF position.
Step2 Remove the terminal protection cover from the DC PSU, and loosen the screws from the terminals using
a Phillips screwdriver.
Step3 Plug the end labeled (–) of the supplied blue DC power cable into the terminal marked (–) on the PSU
and fasten the screw.
Step4 Plug the end labeled (+) of the supplied black DC power cable into the terminal marked (+) on the PSU
and fasten the screw.
Step5 Put on the terminal protection cover.
Step6 Connect the other end of the DC power cables to the wiring terminals of the DC power source for the
access controller.
Step7 Set the power switch on the PSU to the ON position.
Step8 Check the power LED on the front panel of the access controller. LED green indicates that the PSU is
operational; LED red indicates that the PSU is faulty.