4.0 OPERATION
4.4.6 DC Servo
To Prevent
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
4.5 Mains Protection
4.5.1 Inrush Current Limitation
Within 2 seconds of the amplifier 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- fier 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 amplifier 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 amplifier 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.
P.19 | CAMCO USER MANUAL |
VORTEX POWER AMP SERIES |
