Camco VERTOX Series User Manual

Contents

Camco VERTOX Series User Manual Manual pdf 23 page image

4 OPERATIONUSER MANUALVORTEX 3 QUADROP.24.2.2 Signal LEDsThe green signal LED is illuminated when the voltage level at the output reachesapprox. 4 V; this corresponds to a power of approx. 4 W at an impedance of4 Ohms.4.2.3 Clip LEDs (multifunctional)The clip LEDs are bi-coloured: green/red. Each colour indicates a different status.The intensity of the green light is defined by the current passing through theoutput stage of each channel (lowest brightness is proportional to approxi-mately A, the maximum brightness reflects the maximum output current). Thered colour indicates the amount of signal clipping in each respective channel. Ifthe green LED (current indicator) and red LED (clipping indicator) light up simul-taneously, the Clip LED is yellow.If the amplifier is overdriven for prolonged periods, the Clip LED will appear redto alert the user more effectively (the green component of the LED is switchedoff ).Monitoring the output current and clip via the LEDs can aid the detection ofincorrectly wired components and faults in the loudspeakers at an early stage.(See 6 Troubleshooting)4.3 Power Amp Protection Systems4.3. Clip LimiterIf the power amp is overdriven, the clip detection circuit triggers the micro-processor. The processor reduces input signal level by controlling the DCA.The strategy is implemented in software. For sinusoidal input signals the micro-processor limits the input signal in such a way that non-linear distortions of thesignal never exceed %.The clip limiter can work on each channel independently (except in mono-operation). To disable the Clip Limiter, see 4.1.3 Limiter Switch.4.3.2 Under Impedance LimiterAs a result of incorrectly connected or defective loads, under impedance or evenshort circuits may be presented to the power amp channels.In order to detect an under impedance, the microprocessor calculates the result-ant impedance. If an impedance of less than 2,66 ohms/channel is detected, themicroprocessor limits the signal to the power amp until a subsequent measure-ment indicates that impedance has risen to a safe level. Whenever the under