Peavey X-Four owner manual Console and power supply grounding, Redundant power supplies

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power supply 8

power supply usage

console and power supply grounding

Console chassis ground is electrically connected to:the audio ground, pin- 1 of XLR connectors, the sleeves of 1/4” sockets,and to the terminal CON- SOLE GROUND at the rear of the power supply.

The AC third-wire connection in the power supply cable connects the metal chassis of the power supply to safety ground.

Rack-mounting—the power supply ground may transfer to the rack case through the front fixing screws, though this connection is not reliable.

Sound system use—the grounding requirements may call for the ground link to be disconnected.This is permissible only when an alternative ground path has been provided. If in doubt seek the advice of an experienced elec- trical engineer.

This connection should never be disturbed.

Hazardous voltages exist inside the power supply which require the case to be grounded.

a

redundant power supplies

The console power supply can be considered the single most important component in an entire sound system. If a power amplifier,a signal proces- sor or a console input goes down in the middle of a show, the show can still go on. But if the console loses its power supply, the show is over. For this reason, it is always good practice to incorporate redundant power supplies for mixing consoles used in professional sound reinforcement applications.

This should be considered a high priority even when using a very reliable power supply. In even the most carefully designed sound systems, each component runs the risk of failure at sometime or another.

Crest Audio uses two methods for attaching redundant power supplies to consoles. In both methods, the two (or more) power supplies should be kept on while the console is in use to insure a smooth transition in the event that one shuts off.

If one power supply drops in voltage or shuts off completely,the other unit takes over without any interruptions or audible glitches.As an added pre- caution,the two (or more) power supplies can be fed by separateAC lines. This will guarantee that the console does not shut off if one of theAC lines goes down.

multiple power supplies in-series

Crest Audio X-Series consoles use this method for backup. Since each power supply includes voltage switching circuitry,more than two units can be hooked up in series. A DC link cabel ties the power supplies together.

The use of redundant

+

power supplies is

probably the single biggest step that can be taken in reducing or eliminating the chance of a cancelled per- formance due to system failure.

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Contents Four mixing console Manual Table of contents Page Conventions Module Block diagram Panel Line FeaturesPhantom power-+48V PadMono input module High-pass filter-HPF GainModule EQ features 1mono input module Aux stereo 5/6 Aux send featuresAux sends Aux 1-4, 5/6 pre-fader-PREPanel Mute Bus assignment featuresLeft-center-right-LCR Pan controlMono input module Mono input module Mono input module Signal present indicator-SIG Level meter featuresPeak indicator-PK Signal level LED’sMono input module Pre-fader listen-PFL Mono assignment-MLeft / right assignment-L-R Group 1-4 assignment1mono input module Rear panel features Stereo input module Line select-Line Left and right mono-switchesStereo input module Input gain-GAIN Stereo input module Equalizer-EQ on Four-band stereo EQ featuresPanel Stereo balance 5 and 6-STEREO Aux send 1-6 controls2stereo input module Balance control 2stereo input module Left/right assignment-L/R 2stereo input module Balance on-groups-BAL on 2stereo input module Line-input left and right 1/4TRS jacks Balanced left and right line-in XLR connectorsLine-input left and right RCA connectors Group module Mid frequency-MID Output eq featuresGroup module Group equalization -per output channel-EQ to Group Group module Post-group Matrix featuresMatrix 1-2 levels-M1, M2 Panel After-fader listen-AFL Fader reverseReversing aux / group and aux / main Aux 1-6 output levelGroup module Pan Group assignment featuresMono assignment-fromgroup-MONO Left/right assignment-fromgroup-L/RGroup module Fader Group/aux level featuresSignal/peak LED’s Panel Group insert return Group outputGroup insert point Group insert sendLamp dim switch and DC in connector Group inputs Auxiliary 1-6 output XLR’sAux insert point Aux insert sendModule Block diagram High frequency-HF Master module Left,right,mono equalization-EQ to LEFT,TO RIGHT,TO Mono Module External input levels-MATRIX1-2 Left, right, and mono levels-MATRIX1-2Post-left, post-right, post-mono Panel Matrix 1-2 talkback-TALK to Matrix output featuresMaster output levels-MTX1-2 Master module Sum mono Alternate out featuresPre switch Alternate out levelMaster module Headphone level Monitor output featuresMonitor-out level Solo-offFour Block Diagram Sum left/right-SUM L/R Left master featuresSignal/peak LED-SIG/PEAK Talkback left/right-TALK toPanel Right master fader Right master featuresLeft/center/right-LCR to Master Four Block Diagram Main left/ main right-L-R to Mono Mono master featuresSolo on indicator Talkback mono-TALK to MonoPanel Talkback on-TALK on Talkback featuresTalkback level Pink noiseModule Block diagram Left, right and mono output XLR’s Left and right alternate output XLR’sLeft and right monitor output jacks Matrix 1-2 output XLR’sModule Insert points-left, right, and mono DC power-inSpecifications Model 5A power supplyGround linking Power supply usagePower requirements Supply identificationPower supply Multiple power supplies in-series Console and power supply groundingRedundant power supplies D7000011 10 /12 /99
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