H3C S5100-SI series Quick Start Manual page 78

Quick Start
H3C S5100-SI/EI Series Ethernet Switches
Caution:
Make sure that the lightning arrester is well grounded before using
it for power.
After the AC power cord of the switch is plugged into the socket of
lightning arrester, when the green LED is on and the red LED does
not light, it means that the lightning arrester of power is running and
the function of lightning protection has taken effect.
If the red LED is on, make sure you correctly determine whether it
is because the ground wire of the arrester is not well grounded or
because the live and zero wires are connected in reverse direction.
Use the following checking methods. When the red LED is on, use
a multimeter to examine polarity at the power socket of the arrester.
If it is the same as that of the power socket in the equipment room,
it means that arrester is not well grounded. If it is adverse to that of
the power socket in the equipment room, it means that the power
socket of the arrester is set to the reverse polarity. In this case, you
should open the power socket of arrester to correct polarity. After
that, if the red LED still gives alarms, it means that the arrester is
not well grounded yet.
Chapter 4 Lightning Protection
4-3
of the Switch