11
d:series amplifiers
manual
startup
protection circuitries
2.5 - protection circuitries
Soft-startup
To ensure that the main fuse does not trip if one or more power amplifiers are switched on simultaneously,
the amplifier is equipped with a low inrush circuitry for soft-startup of the system.
To avoid damage of system components such as speakers and the amplifiers electrical components, the
d:series amplifier has got safeguard mechanisms for DC error, overcurrent and over voltage at the
speaker outputs.
Overcurrent protection
To avoid the damage of the amplifier due to short circuit, the output current is limited to 15A per amplifier
channel.
Per-Channel-Error protection
In case of a DC error at the amplifier outputs, the power supply of the affected amplifier channels is being
shut down immediately for security reasons.
In case of defects of an amplifier module, two fine wire fuses will cut the power supply for the affected
module to protect the loudspeakers.
The fuses have to be replaced by sonible. Please contact us for further information.
Overtemperature protection
The d:series amplifier is equipped with three temperature sensors to protect the electrical components
in case of overtemperature. One sensor is located at the end of the cooling tunnel and the other two are
located at the power supplies. If the overall temperature is reaching 90°C for any reason, the protection
shuts down the power supply. The amp modules operated by the affected power supply will be shut down
as well. When the normal operating temperature is reached, the power supply will be activated again.
To avoid thermal shut down, ensure enough airflow and ventilation as described in the previous section
(see chapter 2.4 ‘air flow and thermal management’, page 10).
