Calculation Of The Maximum Cable Length With Given Line Cross-Section - Honeywell ACS-8 Installation Instructions Manual

Installation Instructions / ACS-8
6.6.2 Example 2:

Calculation of the maximum cable length with given line cross-section.

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Calculation of the cable length for door 3:
For handling reasons, the max. line cross-section of 0.84mm² corresponding to three wires when using
J-Y(St)Y Ø0.6mm must not be exceeded.
The maximum cable length can be calculated or easily determined by means of 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 permissible. This results in smaller cross-sections if the same length is used or in longer lengths
if the same cross-section is used.
A terminating resistor must be located on the devices indicated to terminate the bus
(marked with XX in the drawing).
The power supply for the module electronics is carried on one wire of the bus. The users
connected to the other wire have their own power supply or their own external power
supply.
A separate line must be used to power the door strike.
Current consumption of the devices in this example:
contactless / proximity reader (026390.10)
4I/2O-module (026592)
door strike
display module (027555)
keypad module (027570)
2 x 70mA 140mA
230mA
230mA
150mA
50mA
25