IDTECK Star iCON100 Quick Installation Manual page 9

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iCON100/iCON100-SR QUICK INSTALLATION GUIDE
3) Power Ground
The most important point for grounding system is not to connect both ends of shield wires to the grounding
system; in this case there will be a current flow through the shield wire when the voltage level of both ends of
shield wire is not equal and this current flow will create noise and interfere to communications.
For the good grounding, we recommend to connecting Only one end of shield wire of communication cable to
grounding system; If you find earth ground nearby, then connect one end of shield wire to earth ground; If you
do not have earth ground nearby, then find chassis ground and connect one end of shield wire to chassis
ground; If you do not find both earth ground and chassis ground, then connect one end of shield wire to power
ground. (GND of iCON100)
Note that if the chassis ground is not properly connected to the earth and floated from the ground level, then
grounding to the chassis ground will give the worst communication; in this case we recommend to using power
ground instead of chassis ground.
Figure: Grounding System
4.2.4 Reverse Diode Connection
If you connect an inductor (Door Locks or Alarm device) to the output relays, there will be a high surge voltage
created while the inductor is turning on and off. To protect this problem, connect the reverse diode as the figure
below.
 Caution
It is strongly recommended to add a reverse diode between the inductor coils to absorb this surge voltage. If
you do not connect a reverse diode, the surge voltage will transfer and damage the electronic circuit of the
controller. 1N4004 – 1N4007 or equality efficiency diode is included in gift box.
Figure: Reverse Diode Connection
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