User's Manual

InfoProx Entry InfoProx Hardware Installation
Power Connections
Power is supplied to the board by a J3 connector. In Figure 2, the diagram
identifies the location of the terminal and power connections:
Figure 2:Terminal and Power Connections
The total cable length between the power supply and the reader depends upon the
cable used and whether or not an exit reader is connected. See the following
instructions regarding voltage:
1. For long cable runs, use Table 1, Voltage Table, to figure the voltage drop of
the cable between the power supply and the reader.
2. Subtract the result from the power supply’s output voltage.
3. If the result is greater than 7.0 volts, the wiring is adequate. If not, use heavier
(lower gauge) wire or a power supply with a higher voltage output.
Example: If you use a 22AWG wire with a 12-volt power supply 300 feet
away from the readers, the voltage drops to 7.2 volts at the
reader. Using Table 1, Voltage Table to calculate the voltage,
multiply 3 (300 ft) times the 1.6V drop = -4.8 drop for the 300
ft. span. Subtracting 4.8 from the 12V supply = 7.2. A voltage
of 7.2 at the readers is sufficient power to operate the readers
above the 7V minimum required. In this example, the total
distance from the power source and the exit cannot be more
than 300 ft.
Software House 15