
52
PA8506-V
|
VES Compact System
PA8500-VES | Voice Evacuation System
System Manual | 2014
UK
8.7.1
IMP. ACQUISITION
Line impedance acquisition
Panel. for. acquiring. and. storing. the. impedance. levels. of. the. speaker. unit.
lines..This.information.is.necessary.for.system.initialisation.and.diagnostics.
• Loudspeaker line impedance acquisition
Foreword
Before.acquiring.the.impedance.values,.make.sure.that.the.following.steps.
have.been.completed:
•. Preliminary.check.of.the.impedance.of.the.lines.using.a.suitable.instrument.
(IMPEDANCE-METER).and.of.the.loading.conditions.as.prescribed.in.the.
SIZING.Section.
•. Connection.of.the.speaker.unit.lines.as.indicated.in.the.CONNECTIONS.
Section.
The.new.impedance.values.acquired.will.be.stored.automatically.in.the.system.and.shown.on.the.labels.of.each.zone..They.are.in.Ohms.and.refer.
to.both.lines,.A.and.B,.connected.to.the.output.of.each.zone..The.impedance.values.residing.in.the.memory.will.be.compared.by.the.monitoring.
system.with.the.values.measured.subsequently.during.the.diagnostics.routine.
Note:
To.measure.the.impedance.of.the.speaker.unit.lines,.the.monitoring.system.provided.in.the.PA8506-V.uses.an.inaudible.20.kHz.tone..Due.to.the.
inductance.of.the.loudspeaker.coils,.the.impedance.at.20.kHz.may.be.considerably.different.from.that.measured.with.an.impedance.meter,.which.usually.
uses.a.1.kHz.measuring.tone..The.value.acquired.by.the.PA8506-V.is.therefore.usually.indicative.only.as.a.comparative.value.for.diagnostic.purposes..
For.this.reason,.when.calculating.the.power.absorbed.by.the.speaker.unit.lines.for.the.purpose.of.sizing.the.system.it.is.recommended.to.use.the.value.
measured.with.an.impedance.meter.
Press.ESC.to.return.to.the.CONFIGURATION.menu.
Upon.completing.the.procedure,.carry.out.a.MANUAL.RESET.of.the.FAILURE.SIGNALLING,.as.described.under.point.8.6.5.1.
Note:
For.a.12-zone.system,.repeat.the.procedure.on.both.PA8506-V.units.
8.7.2
SET TOLErANCE
Setting the line tolerance
Panel.for.setting.the.tolerance.for.checking.the.line.impedance..
If. the. diagnostic. system. detects. a. difference. between. the. impedance.
measured. in. real. time. and. the. value. stored. in. the. system. greater. than.
the.tolerance.that.was.set:.an.“Impedance.Low”.or.“Impedance.Hi”.“Fault.
Warning.Condition”.will.be.activated..For.details.about.signalling.of.failures,.
see.the.“LOUDSPK..LINE.FAULT”.panel.(point.8.5.1.3).
•.
Setting the tolerance for measuring the lines
Foreword
The.measurement.tolerance.must.be.set.after.completing.acquisition.of.the.
line.impedance.(see.point.8.7.1):
After.selecting.“Acquire>.IMPEDANCE”.from.the.CONFIGURATION.menu,.the.“IMP..ACQUISITION”.panel.will.show.the.impedance.values.
stored.at.the.time.of.the.previous.acquisition:
....
.
•.
press the OK key
•. Setting.of.music.to.“OFF”.in.the.output.zones.and.no.service.announcements.being.sent.out.by.any.PA.sources..For.details,.consult.the.MUSIC.
Menu.(see.point.8.3.4).
•.Hold.the.numerical.key.corresponding.to.the.zone.(1-6).down.
.
•.Turn.the.+/-.knob.to.choose.the.required.value.
>
Values from 5% to 100%
:.tolerance.above.or.below.the.stored.value.
>
Test disabled
:.Impedance.check.disabled..Testing.for.short.circuits.and.GND.faults.will.in.any.case.be.carried.out.
Press.ESC.to.return.to.the.CONFIGURATION.menu.
Upon.completion.of.the.procedure,.if.appropriate.carry.out.a.MANUAL.RESET.OF.THE.FAILURE.SIGNALLING.as.described.under.point.
8.5.6.1.
Note:
For.a.12-zone.system,.repeat.the.procedure.on.both.PA8506-V.units.
After.selecting.the.“Set>.IMP..TOLERANCE”.option.from.the.CONFIGURATION.menu,.the.“SET.TOLERANCE”.panel.will.show.the.current.
tolerance.settings.for.each.output.zone.
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