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Bosch Security Systems | 2011-02
Praesideo 3.5 | Installation and User Instructions | 4 | Amplifiers en | 196
12.6 Technical data loudspeaker
supervision board
12.6.1 Physical characteristics
12.6.2 Climate conditions
12.6.3 EMC and Safety
12.6.4 Mean time between failure
12.6.5 Loudspeaker line characteristics
Dimensions (H x W x D):
78 x 60 x 22 mm
Weight:
70 g
Connection:
Screwable connector
Temp era tur e:
-5 to 55 °C (operating, guaranteed)
-15 to 55 °C (operating, sample tested)
-20 to 70 °C (non-operating)
Relative humidity:
15 to 90%, non-condensing (operating)
5 to 95%, non-condensing (non-operating)
Air pressure:
600 to 1100 hPa
Electromagnetic compatibility:
E N55103-1/ FCC -47 part 15B
E N55103-2
EN50121-4
EN50130-4
Electrical safety:
IEC60065 (CB-scheme)
EN60065
Approvals:
CE marking
EN60849, EN54-16 and ISO7240-16
IEC60945
MTBF:
50,000 hours at +55 °C
(The MTBF doubles for every 10 °C decrease in
temperature.)
Preferred cable:
Single twisted pair, 0.75 mm
2
to 1.5 mm
2
. The use of
multiwire cables is not recommended. Cross talk of
communication signals affects the supervision
performance.
Maximum cable length:
1 km (max. 300 m adjacent to other supervised
loudspeaker cables)
Maximum cable loop resistance:
38 ohm
Maximum cable inductance:
750 μH
Minimum total loudspeaker impedance:
50 ohm @ 70 kHz (independent of amplifier power)
Maximum cable capacity:
300 nF. However, if the maximum load capacity for the
power amplifier output is less than this value, the
maximum load capacity of the power amplifier is
leading (see section 8.8).
Maximum number of supervision boards
(LBB4441/00 and LBB4443/00) per amplifier
channel:
80 for a 500 W amplifier channel
40 for a 250 W amplifier channel
20 for a 125 W amplifier channel
10 for a 60 W amplifier channel (PRS-8B060 only)
Loudspeaker voltage:
70 V, 100 V
Note
The load of the loudspeakers in relation to the
line impedance should be such that the 20 kHz
pilot tone level is not less than 9 Vrms at the
position of the supervision boards.