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MP120
PERIPHERAL CONNECTION
The 4-lead (2 leads for data, 2 leads for 12 V- power supply) bus cable is enough only for the keypads and
inserters. As far as expansions are concerned (if they are not powered locally), two additional leads for 12 V-
auxiliary power supply shall be made to run from the control unit ter/- S (in this case, take care that also
total absorption will not exceed the current delivered by the control unit power supply).
BATTERY DIMENSIONING
EC 79-2 Standards (and IMQ as well) request that the system's endurance will be at least 24 hours in case of no
mains supply. The control unit battery as well as the batteries of the auxiliary power supply units (if any) shall
therefore be dimensioned so that the above endurance will be ensured.
Below is the formula for calculation of the battery minimum capacity:
C
b
= (
I
r
x
24
x
1.25
) + (
I
a
x
alarm duration
x
0.02
)
where:
C
b
: battery min. capacity (A)
I
r
: total absorption at rest (A)
I
a
: total absorption during the alarm (A)
alarm duration
: programmed alarm duration (min).
This calculation shall be made for every single booster battery, by referring to all the devices to be powered by the
battery (absorption shall be identified through the respective specifications).
POWER SUPPLY DIMENSIONING
Each power supply (auxiliary or control unit power supply) shall deliver enough current to power the system
devices and recharge the batteries as well (sum of all currents).
The optimum recharge current for a lead battery is equal to 1/10 of its capacity (in any case, a recharge current of
5% ÷ 25% of the battery capacity is permitted).
Moreover, EC 79-2 Standards (and IMQ as well) request that battery recharge is guaranteed to at least 80% of its
capacity during 24 hours (this equals the min. recharge current of 5% of the battery capacity).
Therefore, the minimum current that the power supply will have to deliver shall be:
I
t
= (
C
b
x
5%
) +
I
d
where:
I
t
: current to be delivered by the power supply (A)
C
b
: battery capacity (A)
I
d
: absorption of all devices (as identified through the specifications) (A).
COMPLIANCE WITH THE R&TTE 99/05 EC DIRECTIVE
PERSONAL REPORT AND DECLARATION OF NETWORK COMPATIBILITY
Governmental approval for the transmitting and receiving equipment and the terminal telecommunication
equipment has been abolished as of April 8
th
, 2000.
All the available versions of the Elkron MP120 control unit comply with the R&TTE 99/05 EC Directive.
This equipment has been designed to operate with all the PSTN (Public Switched Telephone Network)
switched public telephone networks with addressing performed through dual-tone signalling with several
DTMF frequencies. It conforms to the R&TTE 99/05 EC – ETSI TBR21 Directive in compliance with the
98/482 EC Decision of the UE Council for trans-European connection as single terminal with a PSTN analog
network.
Owing to the differences in the networks of the various countries, the approval does not guarantee itself
correct operation at all of the PSTN network terminating points.
Therefore, it is recommended that you follow the technical instructions for the product, with regard to
possible special hardware and software programming.
If you encounter troubles, and if you wish to use the equipment on other networks, contact first the product
dealer or the manufacturer.
EC compliance statement is available either at Elkron customer service or through Internet site.
