Crown PIP-AMC Informations techniques télécharger pdf (Page 18)

Macro-Tech 3600VZ Power Amplifier

Page 18

3.3.6 Additional Load Protection

Because the amplifier generates enormous power, it

may be desirable to protect loudspeakers (or other

sensitive loads) from damage due to excessive power.

A common way to do this is to put a fuse in series with

the load. This may be accomplished by using a single

fuse to protect the entire system, or by fusing each

driver.

Fuses help prevent damage due to prolonged over-

load, but provide essentially no protection against

damage from large transients. To minimize this latter

problem, use high-speed instrument fuses such as the

Littlefuse 361000 series. If the loudspeaker is only sus-

ceptible to damage caused by prolonged overload

(such as overheating), use a fuse or circuit breaker

having the same slow thermal response as the loud-

speaker itself (such as a slow-blow fuse).

The nomograph in Figure 3.15 shows fuse size versus

loudspeaker peak power rating. It can be used to de-

termine the size of the required fuse.

3.3.7 AC Power Requirements

Use an isolated power receptacle whenever possible

with adequate current. North American units are

shipped with a 30 amp (10 AWG) line cord, a NEMA

TT30P plug and a NEMA TT30R receptacle. Interna-

tional units are shipped without a plug connected to

the appropriate line cord. Line voltages of 10% or more

above the specified voltage may damage the ampli-

fier.

Fig. 3.15 Loudspeaker Fuse Nomograph

1.0

1.2

1.4

1.6

2.5

1.5

.15

.08

3000

2000

1500

1000

800

600

400

300

200

150

100

1.5

LOUDSPEAKER IMPEDANCE

(ohms)

FUSE

(amps)

LOUDSPEAKER RATING

PEAK MUSIC POWER

(watts)

(Typically 4 times the continuous average power)

Answer: Fuse = 1.5 A

Example:

Impedance = 8 ohms.

Peak Power = 75 W

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Crown PIP-AMC Informations techniques Page 18

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