H3C WX5004 Installation Manual page 42

Note the following:
Make sure that the PE terminal of the arrester is well grounded before using the
1.
lightning arrester for power.
Upon plugging the AC power cable connector of the access controller into the
2.
receptacle of the lightning arrester, if the green LED is on while the red LED does not
alarm, it means that the lightning arrester of power is running and the function of
lightning protection has taken effect.
Pay attention to the red LED light. If it is on, you should correctly locate the problem,
3.
whether it is caused because the ground cable of the arrester is not well grounded
or because the live and zero wires are connected in reverse direction. You may use
a multimeter to examine the polarity at the power receptacle of the arrester:
○
With the power receptacle facing you, if the multimeter displays that the left
wire is the zero wire and the right is the live wire, it means that the PE terminal of
the arrester is not well grounded.
○
Otherwise, it means that the power receptacle of the arrester is set to the
reverse polarity. In this case, open the power receptacle of the arrester and
correct the polarity. After that, if the red LED still alarms, it means that the arrester
is not well grounded yet.
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