Camco D-Power 4 - Manual (Page 20)

4 OPER
ATION
USER MANUAL
D - P O W E R S E R I E S P. 9
D - P O W E R
S E R I E S
4.3 Power Amp Protection Systems
4.3. Clip Limiter
If the power amp is overdriven, the clip detection triggers the Attack-Release-
Circuit (ARC). The ARC delivers the control voltage for the gain reduction. Two
different attack modes (fast and slow) can be selected with the Clip Limiter
switch (see 4.1.4 Limiter Switch).
4.3.2 SOA Protection
Whenever the power transistors leave their Safe Operation Area (SOA), the
SOA-protection in stereo mode switches back the current rail of the respective
channel. In mono modes the rails of both channels are switched back.
4.3.3 DC Protection
Each output of the power amp is constantly monitored for persistent DC voltage
levels. If the 3 V thresholds are exceeded at any of the outputs, the corresponding
channel will be muted. If DC was only detected for a short moment, the ampli-
fier will release mute and work as normal. If DC is detected for longer periods or
repeatedly if this happens,the amplifier will switch to standby mode.
Switch off the amplifier, wait until the power LED stops flashing and switch the
amplifier on again.
4.3.4 Over Current Protection
Over current is permanently controlled in the output stage. There are two limit-
ing levels of over current depending on output voltage. These limits will be set
automatically. This improves reliability without degrading sound quality when
driving complex loads.
4.3.5 Thermal Protection
There are several sensors inside the amplifier in order to ascertain temperature
data. If a temperature of more than 85 °C is detected at the heat sinks, the input
signal on that channel is reduced. If the temperature exceeds 00 °C, the main
SMPS will be switched off.