Chamberlain Sentex INFINITY Installation Instructions Manual page 3

The Infinity systems are powerful and flexible access control
systems. These systems can be damaged by incorrect
installation. In particular, it is critical that Infinity systems be
grounded properly. Each system contains static sensitive
components that can be destroyed by static discharge if not
grounded thoroughly.
The sections that follow contain detailed procedures for each step
required to install an Infinity system. In addition, the following
installation tips will help ensure your installation is done correctly
and efficiently.
GROUND THE UNIT
The Infinity contains parts which may be damaged by static
discharge. A proper earth ground connected to the upper left
grounding screw shown in Figure 1 will significantly reduce the
chances of damage or improper operation. The shielding in the
cables for all remote keypads or card readers should be
connected to the earth ground at the controller end of the cable
only. To be effective, the ground connection must be made by
running 12 AWG copper wire to a good ground point (e.g., an
electrical panel, a metallic cold water pipe that runs into the earth,
or a grounding rod at least 10 feet in length that is driven into the
earth) within 12 feet of the unit. Even if you have a good earth
ground, you should try to discharge any static before handling
the circuit boards.
Figure 1
I M P O R T A N T N O T I C E S
I N S T A L L A T I O N T I P S
NOTE: Keep ground wire as
straight as possible.
12 AWG Minimum
12 ft Maximum
Earth Ground Rod
3
Incorrect installation invalidates the warranty. Please take the
time to read these instructions carefully BEFORE
attempting installation.
Damage caused by static discharge is NOT covered by
warranty.
DO NOT connect the two large heat sinks on the main circuit
board together as doing so can damage the power supply.
Ground
Wire
Other Ground Sources
within 12 ft of Unit
Ground to
Metallic Cold
Water Pipe
Ground to
Existing
Electrical
System