Crown COMTECH DRIVECORE CT 4150 Manuel d'instructions télécharger pdf (Page 13)

page 13

CT Power Ampliﬁers

Operation Manual

13 Advanced Features

13.1 Protection Systems

Your Crown ampliﬁer provides extensive protection

and diagnostic capabilities, including thermal level

control, fault indicators, high-pass ﬁltering, DC

protect, AC under/over voltage protection, inrush

limiting, and a convection-cooled chassis.

13.1.1 Thermal Indicator

If the ampliﬁer becomes too hot for safe operation, the

channel that is generating too much heat will be shut

down until the temperature is reduced.

13.1.2 Fault

The ampliﬁer will enter a Fault state if the ampliﬁer

senses an unsafe condition. This protection is for both

internal and external faults. It is critical to check all

wiring to and from the ampliﬁer to ensure the fault is

not caused by external conditions. Once wiring has

been veriﬁed to be correct, and the fault condition

persists, see Section 17 Service for Servicing

information.

13.1.3 High-Pass Filters

HPF’s are traditionally used in Hi-Z applications. The

Com-Tech DriveCore is a low Z ampliﬁer but can be

used in conjunction with the XFMR 4/8 transformer

box for Hi-Z applications. If the ampliﬁer is to be used

in a Hi-Z application, then it is very important to use

the HPF to prevent transformer saturation.

13.1.4 AC Under/Over Voltage

Protection

If the AC line voltage drops below 25% or rises above

15% of the nominal operating voltage of the ampliﬁer,

the ampliﬁer’s power supply turns off and the blue

Power LED ﬂashes. The ampli ﬁer will turn back on

when the AC line voltage returns to safe operating

levels (within ±10%).

13.1.5 Circuit Breaker

A circuit breaker located near the IEC power inlet

protects the ampliﬁer from excessive AC current draw.

13.1.6 Convection-cooled Chassis

The DriveCore ampliﬁers require no fans for cooling,

providing quiet operation and optimum efﬁciency.

13.1.7 Auto-Standby

If ampliﬁer does not see input signals for a period of 30

minutes, the ampliﬁer will go into standby mode. The

ampliﬁer will come out of standby mode once an input

signal is present. This feature is activated via DIP switch

#2 on the back of the ampliﬁer. The ampliﬁer will be

conﬁgured with Auto-Standby turn-on from the factory.

When the ampliﬁer is in Standby, the Ready Indicator on

the front panel Display will ﬂash.

13.2 Features

13.2.1 Switching Power Supply

Crown’s Switching Power Supply minimizes the

ampliﬁer’s weight. Typical non-switching power

supplies require large, heavy transformers in order to

produce the required power at the output stage. These

transformers must be large to operate at 50 to 60 Hz

(standard AC supplied by the power company).

By contrast, switching power supplies can operate with a

much smaller (and lighter) transformer because they ﬁrst

convert the AC up to a much higher frequency, thereby

reducing waste. The power supply is voltage-speciﬁc,

allowing use in regions using 100V or 240V.

13.2.2 Power Mode

Deep sleep and green mode allow the ampliﬁer to operate

at all times with the lowest possible power level.

13.2.3 Adaptive Rail Technology (ART)

Crown has developed a voltage rail technology that

delivers power on demand. ART is at the center of CT

DriveCore’s Green mode that provides up to an additional

10% of efﬁciency. Through ART, the CT DriveCore is

always operating at maximum efﬁciency.

13.2.4 DriveCore Power Stage

Crown has worked with Texas Instruments to develop an

audio ampliﬁer on a micro-chip. The result is DriveCore

chipset that introduces audiophile quality for an

installation amp:

-Greater than 90% Efﬁciency

-118dB Signal to Noise

-THD less than .05% in midband

frequencies

14 Accessories

14.1 XFMR 4/8

The ComTech DriveCore ampliﬁer is only capable of

low Z applications. It is necessary to use an outboard

transformer for Hi-Z applications. Crown highly

recommends the use of the XFMR 4/8 transformer box.

This transformer box is designed to mate with the top

of the ComTech DriveCore Ampliﬁers. See XFMR data

sheet for wiring diagram.

14.2 Rack Support Ears

The ComTech DriveCore ampliﬁer requires front and

back rack support for proper mounting. These have

been provided with the ampliﬁer.

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Crown COMTECH DRIVECORE CT 4150 Manuel d'instructions Page 13

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