Bosch APC-AMC2-4R4CF Installation Manual page 41

Access Modular Controller 2
For distances below 25 m (75 ft) use AWG18 conductors (1mm²). For longer distances, install
an additional power supply close to the AMC2 controller.
Please, calculate the voltage drop by checking the conductor specifications for characteristic
resistance values. The voltage drop shall not exceed 2 V.
Example:
Length = 100 m/328 ft
U = 12V, I = 1A, maximum U
i.e. RAWG18 (acc. specs) = 6.385
U
Drop
U
Drop
Critical condition! Install the power supply closer to the controller.
External power supplies used must be UL certified and must be located in the same room as
the connected AMC2 device. Recommended maximum distance between power supply unit
and AMC2 is 3 m (9.84 ft).
Notice!
These specifications apply to power supply, readers, relay outputs, and extension interface.
Regarding inputs, specific voltage-drop values need to be taken into account. Refer to
Connecting Analog Input Devices, page 82.
Bosch Access Systems V.B.
Drop
= 20,948 x 0.1 km x 1A = 2.1V
= 6.385 x 328 ft x 1A = 2.1V
= 2V
or 20,948
Installation manual
Installing | en 41
2020-01 | V02 |