Honeywell ACS-8, Installation Instructions Manual

Page: 23 / 142

Installation Instructions / ACS-8 23

Current consumption of the devices in the example:
contactless / proximity reader (026390.10) 70mA
4I/2O-module (026592) 230mA
door strike 230mA
Calculation of the line cross-section with 40m cable length:
The required line cross-section can be determined from diagram 1 or 2 (page 30/31).
The maximum voltage drop of the line is 0.5V. If the ACS-8 is not equipped with a battery, a voltage drop
of 2V-3V is possible. This means that smaller cross-sections can be used if the length is kept constant or
longer lengths can be used if the cross-section is kept constant.
Module supply:
Total current consumption of the modules:
contactless / proximity reader (026390.10) 70mA
4I/2O-module (026592) 230mA
total: 300mA

Calculation of the maximum line resistance:
R
L
= Uv = 500mV = 1.67 Ω
I 300mA

Calculation of the required cross-section:
i = electrical conductivity = 56m of copper
Ω mm²
A = 2 x L = 2 x 40m = 0.855mm ²
R
L
x i 1.67 Ω * 56m
Ω mm²

Calculation of the number of wires with a wire cross-section of 0.28mm² (Ø 0.6mm):
no. of wires =
0.855mm²
=
3.05 wires
!
3 wires
0.28mm²

Calculation of the number of wires with a wire cross-section of 0.5mm² (diameter 0.8mm):
no of wires = 0.855mm² = 1.71 wires
!
2 wires
0.5mm²