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S E R I E S

4 OPERATION

4.4 Mains Protections

4.4.1 Inrush Current Limitation

Within approximately 2 seconds of the Q-POWERAmplifier being switched on, the inrush current limiter will increase mains current smoothly from nearly zero to nominal value. This value depends on program material, output level and speaker loads.

4.4.2 Mains Over Voltage Detection

Mains Over Voltage Detection is always operative. When the mains voltage ­exceeds approx. 263 V (230 V operation) or 137 V (120 V operation), the amplifier will switch off. When the mains voltage returns to nominal value a soft start occurs.

4.4.3 Mains Failure Detection

Mains Failure Detection is always operative.When the mains supply is interrupted for about 2 mains cycles, the amplifier will switch off.When the mains voltage returns to a normal value a soft start occurs.

4.4.4 Fuse Protection

The fuse protection circuit prevents amplifier shut-down (e.g. by a blown mains fuse or a triggered circuit breaker) during extremely hard use with all channels working at very high output power. Without intelligent mains current monitoring and control this could easily happen as the rated output power is several times higher than the capabilities of the standard mains supply.

In order to prevent any shutdown in extreme situations the amplitude of the input signals will be reduced which will in return also reduce the mains current draw.

4.5Main SMPS Protections 4.5.1 Over Current Protection

The main SMPS (Switched Mode Power Supply) transformer current of your Q-POWERAmplifier is continuously monitored. If over current occurs the main SMPS immediately stops working.Should there be an internal failure this feature prevents other parts from being damaged.

4.5.2 Thermal Protection

If the temperature of the main SMPS transformer exceeds 90 °C, the main SMPS is switched off (safety shut-off).

4.6 Fans

The fans mounted in your Q-POWERAmplifier operate permanently, but as long as the temperature remains below 40 °C, they run at their slowest speed and can hardly be heard. The highest detected temperature from any amplifier channel controls the speed of the fans.Above 40 °C the speed is increased until it reaches its maximum value.

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Q - P O W E R S E R I E S