Praesideo 3.5 Installation and User Instructions 4 Amplifiers

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8.8.12 Derating

The graph shows the available continuous power used for emergency tones, speech, etc. as function of the ambient temperature.

 

 

55

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

Power

Power)

45

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

Output

Output

 

 

 

 

 

 

 

35

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Continuous

(% of Rated

30

 

 

 

 

 

 

 

25

 

 

 

 

 

 

 

20

30

35

40

45

50

55

60

 

 

25

 

 

 

 

 

T (°C)

 

 

 

 

figure 8.20: Output power derating

If the amplifier is loaded with loudspeakers up to its rated output power (see section 8.8.12), you can still play music and speech for an indefinite long period of time at an ambient temperature of 55 °C, because of the crest factor (or peak-to-average ratio) of the audio signals. The crest factor of music and speech is typically 6 to 8 dB, which makes the required continuous power 25% or less of the rated output power. Alarm tones are set to -3 dB maximum by Praesideo, resulting in a required continuous power of 50% of the rated output power. This can be delivered for at least 30 minutes at 55 °C ambient or continuously at 30 °C ambient.

8.8.13 Control inputs

Connector (rear side):

16pole header (type Phoenix MC1,5/16-G-3,81) for removable screw connector (MC1,5/16-SWT-3,81)

Total cable resistance:

<1 kohm (with line supervision)

<5 kohm (without line supervision)

Resistance detection (supervision enabled): Cable short circuit

< 2.5 kohm Contact closed

7.5kohm to12 kohm Contact open

17.5kohm to 22 kohm Cable broken

> 27 kohm

Resistance detection (supervision disabled): Contact closed

< 12 kohm Contact open

>17.5 kohm External contacts:

Voltage-free closing or breaking contacts (relay contacts, mechanical switches, mercury contacts etc.)

Bosch Security Systems 2011-02

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Bosch Appliances 3.5 manual Derating, Output power derating

3.5 specifications

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