Power Supply - Fermax EXP8-IO Manual De Instrucciones

Cod. 970092 V12_20
1. D
ESCRIPTION
EXP8-IO is I/O expander dedicated to AC-MAX system. This device enable to increase the number of inputs
and outputs in the system. Such I/Os are used for connection of door locks, door contacts, exit buttons,
signalling devices, etc.
The expanders are connected to access controller through RS485 interface.
Characteristics
•
AC-MAX system I/O expander
•
8 inputs (EXP8-IO)
•
8 relay outputs (EXP8-IO)
•
RS485 interface
•
Screw terminals

Power supply

The expander requires power supply voltage in range of 11-15VDC. It can be supplied from EXP2D/EXP4D
expander of AC-MAX CU-KIT, from access unit controller (e.g. AUX output) or from dedicated power supply
unit. The supply wire diameter must be selected in such way that the voltage drop between supply output and
the device would be lower than 1V. The proper wire diameter is especially critical when device is located in
long distance from the supply source. In such a case the use of dedicated power supply unit located close to
the device should be considered. When separate power supply unit is used then its minus should be
connected to controller's GND by means of signal wire with any diameter. It is recommended to use UTP
cable for connection of device to controller. The table below shows maximal UTP cable lengths in relation to
the number of wires used for power supply.
Table 1. Power supply cabling
Number of UTP wire pairs for power supply
1
2
3
4
Maximal length of power supply cable
150m
300m
450m
600m
10/40