MP500/4N-8-16 Installation
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4.1.2 Calculation of the total absorption of the system
Before proceeding with the installation, it is necessary to know the total absorption of the system in order to be able to proceed with the
control for the sizing of the power supplies and batteries.
The calculation procedure is as follows:
list all the necessary devices, with their quantity and maximum absorption per unit in stand-by (which is all available from the
technical specifications), multiplying then the quantity and the absorption to obtain the partial total for each type of device;
sum all the partial totals to obtain the subtotal;
add 10% to the subtotal for potential future upgrades;
calculate the total.
The table below illustrates an example of how to calculate the total absorption:
Device
Quantity
Max absorption:
Total
Control panel
1
X
85 mA
= 85 mA
Keypads ….
…
X
… mA
=
… mA
Readers
…
X
… mA
=
… mA
Expansion modules
…
X
… mA
=
… mA
Supplementary power supply unit
(Expansion)
…
x
55 mA
=
… mA
IR detectors
…
x
… mA
=
… mA
SUBTOTAL
… mA
+ 10% for future upgrades
… mA
TOTAL
… mA
Note
:
▪
Magnetic contacts do not absorb electricity.
▪
The self-powered siren, when it sounds, draws electricity from its own battery.
IMPORTANT!
To not overload the control panel battery, when the mains power supply is absent, plan to use the self-powered
sirens and optical signals (equipped with their own battery).
IMPORTANT!
Make sure the total does not exceed the values shown in Table 4, in order to ensure the required autonomy.
4.1.3 Using supplementary power supply units
If ever the electricity necessary to power the system should be more than what can be supplied by the control panel (see
), it is
necessary to split the system by using one or more AS500/RPT supplementary power supply units.
IMPORTANT
! The AS500/RPT supplementary power supply unit can be used only with the MP500/8 and MP500/16 systems.
IMPORTANT!
In any case, each AS500/RPT supplementary power supply unit impacts the control panel absorption when it
comes to its expansion section (55 mA max). Considering the potential detectors and actuators powered by its oV1
and +V2.
For more information on the supplementary power supply units, see paragraph
5.11 Installation of the AS500/RPT Supplementary
Power Supply.
4.2
CABLE SIZING
The formulas for sizing the connection, audio, and power cables are illustrated below. There are also the criteria to follow when
creating busses and in connecting power supplies/repeaters.
4.2.1 Cables to be used, connections of the shields and installation
For the wiring, use a shielded multipolar cable with 4 or more conductors for anti-intrusion. The conductors that connect the inputs and
the data Bus signals
+D
and
D
must have a minimum gauge of 0.22 mm
2
.
The shieldings can be connected together at the negative pole of the control panel power supply.
If AS500/RPT supplementary power supplies are used, the secondary bus shields can be connected together at the negative pole of
the power unit of the AS500/RPT supplementary power supply unit.
IMPORTANT!
Never connect the cable shields to the earth.
For the audio bus, use a normal telephone wire (twisted pair).
IMPORTANT!
When installing the cables, keep the anti-intrusion system cables separate from the electrical system of the
apartment or office (separate ducts).
