MY HOME GUIDE 2 WIRE SOUND SYSTEM
29
GENERAL RULES FOR INSTALLATION
GENERAL RULES FOR INSTALLATION
Calculation of the current absorption
The system absorption is always calculated whenever the diagrams in the
guide are not followed.
When calculating the current absorbed by the components, remember that
the maximum current which can be supplied by the power supply must not
be exceeded.
To calculate the current absorbed by the sources, consider the source with
greatest absorption in “ON” and all the others in “stand-by”.
While for the flush-mounting amplifiers L4562 consider the ON absorption
relative to the type of load connected (loudspeaker impedance and number
of outputs connected to the loudspeakers).
There must be at most 100 SCS devices.
There must be at most 8 L4562 amplifiers.
There must be at most 40 F502 amplifiers
(maximum 10 for output of node F441).
The maximum current of each individual Node audio/video output F441
must be less than 600mA continuous. This limit translates as a maximum of
2 flush-mounting amplifiers L4562 with 8 ohm loudspeakers or 4 flush-
mounting amplifiers L4562 with 16 ohm loudspeakers.
Table of absorptions
Description Item Stand-By ON
Power supply: 346000 1200mA (max. suppliable current)
346001 1000mA (max. suppliable current)
Audio Video Node: F441 - 20mA
RCA input source: HC/HS/L/N/NT4560 12mA 30mA
Radio Tuner: F500 12mA 50mA
Stereo control source: L4561 12mA 40mA
Flush-mounted stereo amplifier: L4562 6mA 250mA with 8ohm loudspeakers on the 2 L-R outputs.
H4562 130mA with a 8ohm loudspeaker on 1 L-R output.
130mA with 16ohm loudspeakers on the 2 L-R outputs.
90mA with a 16ohm loudspeaker on 1 L-R output.
40mA (MUTE)
Service sector amplifier: F502 - 5mA (from BUS)
Special control: H/L4651/2 - 7.5mA
TOUCH SCREEN: H4684
L/N/NT4683 - 20mA
Scenario module: F420 - 20mA
SCS/SCS interface (on OUT): F422 - 3mA
SFERA B/W 2 wire camera 342510 12mA 250mA
Sfera 2 wire speaker module 342170 25mA 75mA
PIVOT B/W 2 wire video handset 344102 5mA 505mA
A calculation example considering the diagram called Small house is
proposed below.
Material list Quantity Absorption (mA)
F500 Tuner 1 1 x 50
L4561 Stereo control 1 1 x 12
L4562 Flush-mounted amplifiers 8 (loaded with 2 loudspeakers, 16ohm each) 8 x 130
F441 A/V Node 1 1 x 20
TOTAL 1122
EXAMPLE 1
A calculation example considering the diagram called House with integrated
2 wire Video door entry is proposed below. To calculate the current absorbed
Material list Quantity Absorption with Absorption in video door
sound system entry conversation
F441 A/V Node 1 1 x 20mA 1 x 20mA
F500 Tuner 1 1 x 50mA 1 x 50mA
L4561 Stereo Control 1 1 x 12mA 1 x 12mA
L/N/NT4560 RCA input 1 1 x 12mA 1 x 12mA
L4562 Flush-mounted amplifiers 6 (with 2 16 ohm loudspeakers) 6 x 130mA 6 x 40mA
L/N/NT4683 TOUCH-SCREEN 1 1 x 20mA 1 x 20mA
32510 SFERA B/W 2 wire camera 1 1 x 2mA 1 x 250mA
342170 SFERA 2 wire Speaker Module 1 1 x 25mA 1 x 75mA
344102 PIVOT B/W video handset 2 2 x 5mA 1 x 505mA
TOTAL 941mA 1184mA
EXAMPLE 2
during the video door entry call, consider the MUTE absorption of the flush-
mounting amplifiers.
To calculate the current margin consider the higher absorption, thus 1200 - 1184 = 16mA
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