Ecler NPA2500T User Manual

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Ecler NPA2500T User Manual Manual pdf 7 page image

74. OPERATION AND USAGE4.1. Start upIf the POWER (17) switch is operated on the rear panel, the amplifier receives mains power and can beturned on locally or remotely (see Control panel section).In a complete audio installation, it is important to start up the equipment in the following sequence: soundsources, mixer, equalizers, active filters and finally power amplifiers. To turn them off the sequence should followan inverse pattern.4.2. Front panel LED indicatorsNPA amplifiers have a simple and effective indicators system:• THERMAL protection indicator (2):It indicates that the cooling tunnel temperature has exceeded the minimal risk threshold for the equipment.The amplifier automatically restarts once the temperature drops enough.NPA amplifiers have a thermal protection per channel. This means each protection operates independently. Itcan be activated for one channel only while the other is running smoothly.• PROTECT indicator (3):It indicates the absence of signal at the speaker output. It can light up for the following reasons:o At start-up and during the STANDBY time necessary to settle the amplifier internal voltages.o Because of equipment fault preventing the normal booting (the LCD shows “PERSISTENTPROTECT”).o When the amplifier is delivering a very low frequency signal that could damage the speakers.o When more than 4 short-circuits have been detected at the amplifier output over a period of 40seconds (the LCD shows “REPETITIVE PROTECT”).o When an internal fault occurred and the amplifier needs to be fixed (the LCD shows “FAULTYAMPLIFIER”).In any case, permanent lighting of these indicators is a symptom of faulty operation and the cause that ledto this activation should be investigated.• CLIP indicator (4):It lights up when the signal delivered to the speakers is near clipping. The CLIP system considers possiblevoltage fluctuations of power supply, always giving a real indication even if they exist. It is normal for CLIPindicators to be lit at the bass frequencies rhythm for high operating levels, as these frequencies have the higherenergy content. You must take care that these indicators do not permanently light up during normal operation ofthe equipment.• SIGNAL presence indicator (5):It indicates a signal presence at the amplifier inputs. These indicators light up when the input signalexceeds -40 dB.• DATA transfer indicator (11):It blinks to indicate data transfer activity between the amplifier and a remote control PC running EclerNetManager.