Bedienungsanleitung Cambridge Audio AZUR 851E (Seite 14 von 16) (Englisch)

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Trigger In

In the System settings menu, press the Power input select button to

enter the submenu. Press the Trig In input select button to enable the

function.

Volume

Trig In

Power

Auto PwD

Mode

Press the Mode button to exit the submenu.

Auto Power Down (APD)

In the System settings menu, press the Power input select button to

enter the submenu. Pressing the Auto PwD input select button will scroll

through the options of 2 hours, 1 hour, 30 mins, 15 mins, 10 mins, 5

mins and Auto PwD (disabled).

Volume

Trig In

Power

Auto PwD

Mode

Press the Mode button to exit the submenu.

CAP5: Five-way protection system

Note: When the 851E is paired with other Cambridge Audio Power

Amplier (such as the 851W and 651W), the 851E can detect errors

from the power amplier and an error notication will ash briey on the

851E LCD display.

Cambridge Audio has developed a proprietary protection system to

ensure reliability and long life of its ampliers.

To achieve this, connect the 'Control Bus Out' from the 851W to the

'Control Bus In' on the 851E.

851E

851W

This protection system comprises ve main protection methods:

1. W DC Offset – DC detection

Indicator – Unit has switched off during operation.

Description – CAP5 offers loudspeaker protection if the output of the

amplier goes to a high constant voltage (DC). This is a rare fault,

although detecting it could just save those expensive loudspeakers.

Remedy – Due to the necessary sensitivity of the DC protection circuit,

hard clipping of the amplier may cause DC protection to be triggered.

If this fault occurs please switch the unit off, power up again and check

operation with a reduced volume level. If the DC fault occurs again

please contact your dealer for service.

2. W Overtemp – Over temperature detection

Indicator – Unit has switched off during operation.

Description – CAP5 includes temperature detection which constantly

monitors the heat generated by the output transistors. If the monitored

temperature reaches a high level (suitably within the limits of the output

devices) the amplier will automatically switch into a fault mode. If the

loudspeaker impedance is low, the temperature of the amplier may rise

faster as the amplier is working harder. If the amplier is mounted in

a cabinet or the ventilation slots are obstructed, the over-temperature

detection may activate/reactivate after a short listening time.

Remedy – The unit is not damaged, although it should be left for 15

minutes to cool down before being switched out of Standby.

3. W Overload – Overvoltage/overcurrent detection

Indicator – Unit has switched off during operation.

Description – CAP5 offers V/I protection by constantly monitoring the

output transistors to keep them working inside their Safe Operating

Area (SOA). The SOA is a set of limits given by the output transistor

manufacturer to ensure reliability. V/I also protects the amplier against

short-circuits on the speaker terminals during use.

Remedy – The amplier is being used outside its performance envelope.

Reduce the volume. Also check to see if there is a short- or partial short-

circuit between the loudspeaker terminals.

Note: If the indication remains the same and multiple loudspeakers are

being used on each loudspeaker output, then please remove a pair and

retry. If too many loudspeakers are connected to any amplier, causing

the load resistance to drop too low, the amplier will be overdriven. CAP5

will detect this situation. If the indication remains the same with only one

set of loudspeakers connected, there may be a fault with one or both of

the loudspeakers.

4. W Skp shrt – Short-circuit detection

Indicator – As the unit attempts to come out of Standby mode.

Description – During power up from Standby, CAP5 performs a check

on the loudspeaker terminals to see if a short across the terminals has

been accidentally introduced. If the resistance measured across the

loudspeaker terminals is too low, the unit will remain in Standby mode

until the fault has been removed and power up is re-attempted.

Remedy – User-related fault. There may be a short-circuit between

the loudspeaker terminals. Check all loudspeaker connections before

attempting to switch the unit out of Standby.

5. W Clipping – Intelligent clipping detection

Indicator – Audio output is at/above the clipping level.

Description – CAP5 has the ability to detect when the amplifier starts

to clip or overdrive at its output, which can damage loudspeakers and

degrade the sound. Clipping distortion is caused at high volume levels

when the output signal briefly goes outside the maximum voltage that

the amplifier can provide, causing the tops of the signal to flatten off.

Clipping

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Cambridge Audio AZUR 851E Seite 14

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