B-1
Appendix B Installation of Lightning Arrester for AC
Power
No lightning arrester (lightning protection grounding strip) is supplied with the access controller.
If an outdoor AC power cable should be directly led to the access controller, to prevent possible
damages to the access controller due to lightning strike, please serially connect the lightning arrester for
AC power (lightning protection grounding strip) before you plug AC power cable into the access
controller. You can use cable clips and screws to fasten the lightning arrester for AC power on the
cabinet, workbench or the wall of the equipment room. When you power on the access controller, the
AC power flows through the lightning arrester and then into the access controller.
Figure B-1
Diagram of lightning arrester
Note the following points:
1) Make sure that the PE terminal of the arrester is well grounded before using the lightning arrester
for power.
2) Upon plugging the AC power cable connector of the access controller into the 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.
3) Pay adequate attention if the red LED is on. You should correctly locate the problem, 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.
4) You may use a multimeter to examine the polarity at the power receptacle of the arrester:
