Dynacord H 2500 Manuel d'utilisateur télécharger pdf (Page 31)

PowerH SERIES

Owner’s Manual 31

IRIS-Net

The IRIS-Net-LED lights blue if an IRIS-Net™-compatible remote control module has been installed in the

power amp’s extension slot and successful data communication has been established. All LEDs blink

slowly whenever the “Find” function in IRIS-Net™ is being used to locate a power amplifier in the rack.

Deactivate „Find“ function via IRIS-Net™ or press any key at the amplifier front.

3.4 Fan Cooling

The power amplifier has two fans on the front and one on the rear. The fans are switched in five

performance-optimized levels, i.e. they are not running permanently but the running speed of each fan is

individually controlled depending on the ambient temperature. That in return ensures very silent running

during idle state. The temperatures of the power amp’s two channels and of the power supply unit are

registered and monitored separately. The intelligent and processor-controlled fan-control activates a fan to

run exactly at the level that is needed to cool down the corresponding components. This concept

effectively prevents the needless "rev up" of the fans when in idling state as well as the occurrence of a

thermally balanced condition, which causes permanent noise-intensive running of the fans. In other words,

the fans are activated only when it is really necessary because of thermal conditions. During power-on of

the amplifier, all fans run for a short period of time to verify the correct functioning.

3.5 Protections

In case one of the power amp’s internal protections responds during operation, a corresponding message

appears on the LC display (or the PROTECT-LED lights) and an entry containing date, time, and protection

type is created in the event log.

True RMS Mains Voltage and Current Measurement

PowerH SERIES amplifiers are consistently informed about the state of the mains network that they are

connected to. The CPU of the power amplifier continually computes the current RMS (Root Mean Square,

effective value) of the mains voltage and the mains current consumption. This genuine RMS measurement

has substantial advantages over the commonly used peak value measurement:

• Mains voltage measurement functions reliably even with non-sinusoidal mains networks, which, for

example, can be found with a generator-powered amplifier or when the mains voltage situation beco-

mes unstable.

• Mains voltage measurement is insusceptible to transient mains interference, as can occur when swit-

ching inductive loads such as large electric motors.

• True mains current RMS measurement allows the precise matching of the power consumption to the

characteristics of a mains circuit breaker. Detailed information about the adjustable Mains Circuit Brea-

ker Protection function is provided in the following paragraph.

RMS measurement permanently protects the power amplifier against mains over or undervoltage. At the

occurrence of extreme mains overvoltage, the power amp switches off to prevent severe damage.

Switching on the power amp is not possible whenever mains overvoltage has been detected. The mains

voltage monitoring protection switches the power amplifier off at the occurrence of extreme mains

undervoltage (less than 70 V AC). In both cases, the blinking POWER-LED indicates the fault condition. In

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Dynacord H 2500 Manuel d'utilisateur Page 31