Additional Load Protection; Ac Power Requirements - Crown Macro-Tech 3600VZ Reference Manual

Macro-Tech 3600VZ Power Amplifier

3.3.6 Additional Load Protection

Because the amplifier generates enormous power, it
may be desirable to protect loudspeakers (or other sen-
sitive 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 overload,
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 susceptible to
damage caused by prolonged overload (such as over-
heating), use a fuse or circuit breaker having the same
slow thermal response as the loudspeaker itself (such
as a slow-blow fuse).
Fig. 3.15 Loudspeaker Fuse Nomograph
Reference Manual
The nomograph in Figure 3.15 shows fuse size versus
loudspeaker peak power rating. It can be used to deter-
mine 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 amplifier.
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