SATEL Installer Manual 9
3.1 INSTALLATION PLAN
Installation must be preceded by preparation of a plan of the security alarm system. It is
advisable that you draw up a sketch of the premises, showing all the devices to be included
in the system, i.e. the control panel, keypads, detectors, sirens, expansion modules, etc.
The control panel and other security system components should be installed within the
boundaries of the protected area.
3.2 ESTIMATION OF SYSTEM CURRENT CONSUMPTION
At the stage of planning the security system, you should sum up the currents consumed by
all devices included in the system (control panel mainboard, keypads, additional modules,
detectors, sirens, etc.). The calculation should also take into account the battery charging
current. If the sum of currents exceeds the control panel capacity, i.e. 2 A, expanders with
power supply or an extra power supply unit must be used in the system.
The sum of currents consumed by the devices connected to the power supply unit (expander
with power supply) must not exceed the power supply output current.
When planning connection of devices to particular power outputs (control panel, expander
with power supply, etc.), remember that the sum of currents consumed by these devices
must not exceed the maximum current-carrying capacity of those outputs.
3.3 CABLING
It is recommended that straight unscreened cable be used for making electric connections
between devices included in the system (using the twisted pair type of cable, e.g. UTP, STP,
FTP is not advisable).
Cross-section of the power supply wires should be selected so that the supply voltage drop
between the power supply and the supplied device should not exceed 1 V as against the
output voltage.
In order to guarantee correct functioning of the system components it is important to ensure
that resistance and capacitance of the signal wires are as low as possible. When the distance
between the devices is more substantial, several wires connected in parallel may have to be
used for each signal, in order to reduce conductor resistance. This, however, may lead to an
increase of conductor capacitance. Too high resistance or capacitance of the cables
connecting the control panel to keypads or expansion modules can prevent the devices from
working correctly (e.g. the control panel will be unable to identify devices, absence of devices
will be reported, etc.). When selecting the length of cables, follow recommendations set out in
sections on connection of particular types of devices.
The signal wires of keypad bus (DTM, CKM, COM) must be run in one cable (they must not
be run in separate cables). Also the signal wires of expander bus (DT, CK, COM) must be
run in one cable.
When you make the cabling, remember that there must be sufficient distance between the
low-current wires and the 230 V AC power supply wires. Avoid running the signal cables in
parallel of the 230 V AC supply cables in close vicinity of them.
The cables should not run in immediate vicinity of antennas, because it could adversely affect
radio communication.
3.4 INSTALLATION OF CONTROL PANEL MAINBOARD
The control panel mainboard contains electronic components sensitive to
electric charges.
Before connecting the mainboard to power supply source (battery, alternating
voltage from transformer), you must have finished all the installation work with