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CAMCO USER MANUAL
VORTEX POWER AMP SERIES
P.19
4.4.6 DC Servo
To Prevent DC-Offset at the Speaker output the VORTEX is tted with two
DC-Servos. (Hence there are no capacitors in the signal path!)
4.4.7 Power Amp Over Current Protection
Over current is permanently controlled in the output stage. There are two
limiting 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.
4.4.8 Power Amp Thermal Protection
The microprocessor uses several sensors in the amp in order to ascertain
temperature data. If the microprocessor detects a temperature of more than
85 °C at the heat sinks, the input signal on that channel is reduced.
The power LED of the overheated channel will start a blinking-sequence
(See 6.0, Trouble Shooting)
4.5 Mains Protection
4.5.1 Inrush Current Limitation
Within 2 seconds of the amplier being switched on, the inrush current limiter
will increase mains current from nearly zero to nominal value. This value
depends on program material, output level and speaker loads.
4.5.2 Mains Over Voltage Detection
Mains over voltage detection is always operative. When the mains voltage
exceeds approx. 267 V (230 V operation) or 134 V (110 V operation), the ampli-
er will be switched off. When the mains voltage returns to nominal value, a
soft start occurs.
4.5.3 Mains Failure Detection
Mains failure detection is always operative. When the mains supply is
interrupted for about 2 mains cycles, the amplier will be switched off. When
the mains voltage returns to a normal value, a soft start occurs.
4.5.4 Fuse Protection
Depending on the load impedance and type of signal levels, the effective
mains current can, even during normal operation, reach a level several times
higher than its nominal value for short periods. Repeated peaks of this nature
will also cause the average value to increase. In such cases, the internal mains
fuse and external 16 A circuit breaker acts as a “bottleneck”, and would trip if the
average current remained too high for an extended period. In order to avoid
this unsatisfactory operation, the mains fuse is simulated inside the amplier
and provides the microprocessor with information. Prior to the point when the
circuit breaker would trip, a signal is sent to the microprocessor, which then
instantaneously reduces the signal level. After the known recovery time for the
fuse has elapsed, the signal is again adjusted to its normal level. This offers
reliable operation of a 6 kW VORTEX on 16 A Mains at 230 V and
30 A at 115 V.
4.6 Main SMPS Protections
4.6.1 Main SMPS Over Current Protection
Main SMPS (Switched Mode Power Supply) Transformer current is continuously
monitored. If over current occurs, the main SMPS immediately stops working.
Should there be an internal failure, this feature prevents other parts being
damaged.
4.0 OPERATION