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PROTECTION DEVICES

THERMAL PROTECTION

When the ampliﬁer becomes overheated (temperature >90°C), this protection device puts the

audio signal in mute status until normal operating conditions have been restored.

This intervention is signalled by the simultaneous lighting of the LEDs (red PEAK / LIMITER -

yellow MUTE / PROT) located on the front of the ampliﬁer that give the TEMP indication.

There is also a thermal protection for the toroidal transformer, which guarantees safety even

under extremely harsh operating conditions. This protection is inserted when the ampliﬁer works

over its capabilities.

As soon as the normal operating temperature return, all the functions are restored. The restore

may take a quite long time, especially when thermal protection concerns the transformer, because

its nucleus needs a long time to dissipate the accumulated heat.

DC / RFI PROTECTION

Ampliﬁers are equipped with relays on the audio outputs that protect the loudspeakers in the

event of direct voltage, radio disturbance or subsonic frequencies and have an anti-bump function

during initial ampliﬁer switch-on. Tripping is signalled by the lighting of the yellow MUTE / PROT

LED on the front panel of the ampliﬁer. Normal operation is restored automatically as soon as the

disturbance is eliminated.

SHORT CIRCUIT PROTECTION

Ampliﬁers are equipped with a device for protection against short circuits on outputs. This

protection puts the input signal into mute status and is signalled by the yellow MUTE / PROT

LED, which remains lit. During mute status, attempts are made to restore the signal (about every

3-4 seconds), indicated by the yellow MUTE / PROT LED going off. Normal ampliﬁer operation

is restored as soon as the short circuit condition is eliminated. This protection is also activated

when the equipment is delivering too much current (load impedance too low).

LIMITER

Ampliﬁers incorporate two limiter circuits that ensure the control of the input signal level

(up to +10 dB from the correct sensitivity value), optimise the ampliﬁer working and protect

loudspeakers against potentially damaging distorted signals.

RCF ED600 User Manual

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