Crown PIP-AMC Informations techniques télécharger pdf (Page 20)

Macro-Tech 3600VZ Power Amplifier

Page 20

Fig. 4.2 Macro-Tech Indicator States

when an input signal that is too large begins to cause

early clipping distortion at the input.

Note: the Channel

2 IOC indicator will stay on in Parallel-Mono mode.

4.3 Protection Circuits

Macro-Tech

amplifiers provide extensive protection

and diagnostics capabilities. Protection systems in-

clude

ODEP

, “standby”, and an AC circuit breaker.

These features provide protection under any condi-

tions.

ODEP

SIGNAL

IOC

OFF

There is no power to the amplifier and all indicators are off, including the Enable light.

Possible reasons: (1) The amplifier’s enable switch is off. (2) The amplifier is not plugged into the power

receptacle. (3) The AC circuit breaker has been tripped. (4) The amplifier’s low-voltage power supply

fuse has blown.

Indicator Status Amplifier Condition

ODEP

SIGNAL

IOC

OFF

Normal operation for a channel with NO audio output. Possible reasons: (1) There is no input signal.

(2) The input signal level is very low. (3) The channel’s level control is turned down.

ODEP

SIGNAL

IOC

Normal

Normal operation for a channel with audio output. The

ODEP

indicator will remain at full intensity

to show that there is reserve thermodynamic energy, and the signal/

IOC

indicator will flash with normal

intensity to show that the channel has audio output.

ODEP

SIGNAL

IOC

Bright

The channel’s output is exceeding 0.05% distortion. The input signal level is too high and

IOC

reporting an input overload or output clipping.

ODEP

SIGNAL

IOC

OFF

Bright

The amplifier channel is in standby mode. Possible reasons: (1) A

P.I.P.

module like an IQ

P.I.P.

has turned off the channel’s high-voltage power supply. (2) The amplifier has just been turned on and

is still in the four second turn-on delay. (3) The DC / low-frequency protection circuitry has been

activated. (4) The fault protection circuitry has been activated. (5) The transformer thermal protection

circuitry has been activated.

ODEP

limiting has been activated. Possible reasons: (1) The amplifier’s air filters are blocked and

need to be cleaned. (2) There is insufficient cooling because of inadequate air flow or air that is too hot.

(3) The load impedance for the channel is too low because the output is shorted or the amplifier is

driving too many loudspeakers for the selected stereo/mono mode. (4) The amplifier channel is

continuously being driven to very high output levels.

ODEP

SIGNAL

IOC

OFF

Normal

ODEP

limiting is about to begin. Possible reasons: (1) The amplifier’s air filters are blocked and need

to be cleaned. (2) There is insufficient cooling because of inadequate air flow or air that is too hot.

(3) The load impedance for the channel is too low because the output is shorted or the amplifier is

driving too many loudspeakers for the selected stereo/mono mode. (4) The amplifier channel is

continuously being driven to very high output levels.

Channel 2 only: The amplifier is in Parallel-Mono mode. The Channel 2 signal/

IOC

indicator always

turns on to full brightness whenever the amplifier’s stereo/mono switch is set to Parallel-Mono mode.

A channel’s circuit breaker has tripped. Transformer overload can cause a channel’s circuit

breaker to trip.

4.3.1 Output Device Emulation Protection

(ODEP)

Crown invented

ODEP

to solve two long standing prob-

lems in amplifier design: To prevent amplifier shutdown

during demanding operation and to increase the effi-

ciency of output circuitry.

To do this, Crown established a rigorous program to

measure the

safe operating area

(SOA) of each output

transistor before installing it in an amplifier. Crown also

designed intelligent circuitry to simulate the instanta-

neous operating conditions of those output transistors.

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