Peavey CS 1200X - Manual (Page 9)

per channel or 4 ohms BRIDGE mode for any application. Operation at loads of 4 ohms per
channel or 8 ohms BRIDGE mode is more desirable for sustained operation applications, be-
cause the amplifier will run much cooler at this load. Operation above 4 ohms per channel and
even open-circuit conditions can always be considered safe; however, sustained operation at
loads below 2 ohms could result in temporary amp shutdown due to operation of the thermal
limiting and/or the fault detection circuitry.
INSTALLATION AND CONNECTION
The Peavey CS 1200X Commercial Series Power Amplifier is designed for durability in com-
mercial installations and quality of performance required in studio and home applications, The
unit is a standard 19” rack-mount configuration that requires 7” rack height; it is cooled by an
automatic two-speed internal fan. The front panel contains various LED indicators for the moni-
toring of power output, DDT activation, and thermal shutdown.
and calibrated input
sensitivity controls and a heavy-duty mains power switch are also provided. All inputs, outputs,
and patch points are on the back panel,
MAINS POWER SOURCE
If possible, each amplifier should be connected to separate mains circuits capable of delivering at
least 15 amps continuously. This is most critical for sustained high-power applications into
2 ohms per channel. Never break off the ground pin on the CS 1200X. Always use a qualified
electrician to install any necessary electrical equipment. To prevent the risk of shock or fire
hazard, always check to see that the amplifiers are properly grounded.
INDUSTRIAL AND COMMERCIAL INSTALLATIONS
For commercial and other installations where sustained high-power operation is required, the
amplifiers should be mounted in a standard 19” rack. It is not necessary to leave a rack space
between each amplifier in the stack, since the fan pulls air in from the rear and exhausts the hot
air out of the front. An adequate cool air supply must be provided for the amplifiers when
mounted. The internal fan must have a source of air that is not preheated by other equipment.
The amplifier will start up in low-speed fan operation and will normally stay at low-speed opera-
tion unless sustained high-power operating levels occur. As the amplifier heat sinks heat up, the
automatic thermal-sensing circuitry will cause high-speed operation to occur. Depending upon
signal conditions and amplifier loading, high-speed fan operation may continue, or the fan may
cycle continuously between high and low. This situation is quite normal. If cooling is inadequate
due to preheated air, or a reduction of air flow occurs due to blockage of the inlet or outlet ports,
or if the amplifier is severely overloaded or short-circuited, the internal thermal-sensing system
may cause temporary shutdown of that particular channel. Depending upon the availability of
cool air, operation should be restored in that channel relatively quickly. In any case, corrective
action should be taken to determine the cause of the thermal shutdown. If the amplifier is not
severely overloaded or short-circuited, and air flow is normal in the amplifier, steps should be
taken to provide a cooler environment for all the amplifiers. As a general rule, the cooler elec-
tronic equipment is operated, the longer its useful service life will be.
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