Bosch AMC2 Series Installation Manual

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AMC2 ModularController Installing | en 27Bosch Access Systems GmbH 2018-09 | AMC2-4W_UL |4.5 CablingNotice!Risk of malfunctionThe cables used in the AMC2-4W access control system are notprone to electrical interference. However, you should avoidrouting cables close to heavy load switching cables andequipment. If this is unavoidable, cross the cable at right anglesevery 1 to 2 m (3 to 6 ft) to reduce interference.4.5.1 Conductor data for power to AMC2With the calculation below you can find out which cable typemust be used. If you connect the power supply and the AMC-device with the delivered cable set from the enclosure thecalculation is not necessary.For distances below 25 m (75 ft) use AWG18 conductors(1mm²). For longer distances, install an additional power supplyclose to the AMC2 controller.Please, calculate the voltage drop by checking the conductorspecifications for characteristic resistance values. The voltagedrop shall not exceed 2 V.Example:Length = 100 m/328 ftU = 12V, I = 1A, maximum UDrop = 2Vi.e. RAWG18 (acc. specs) = 6.385 or 20,948UDrop = 20,948 x 0.1 km x 1A = 2.1VUDrop = 6.385 x 328 ft x 1A = 2.1VCritical condition! Install the power supply closer to thecontroller.