
SimradMS70
AboutthePowerSupplyUnit
TheSimradMS70comprisesthreePowerSupplyUnits.EachunitprovidesACandDC
powertooneofthethreetransceiverracksinthetransceiver.Externalanaloguepower
supplieshavebeenchosentoensureminimumelectricnoise.
InordertoreducethevoltagedropinthepowercablesbetweeneachPowerSupplyUnit
andtheTransceiverUnit,thesecablesmustbekeptasshortaspossible.Thecablesmust
alsoberuninsteelconduitstominimizeelectricnoise.
ThemainactivecomponentsineachPowerSupplyUnitare:
•OneInternetPowerSwitch
•Onepowersupply,6Vdc
•Onepowersupply,12Vdc
•Onepowersupply,75Vdc
PowerSupplyUnitpreparations
BeforethePowerSupplyUnitsaremounted,observethefollowingprocedure.
Figure17PowersupplyUnit
ventilation;airow
Installationmethods
•Eachcabinetcanbeinstalled
“stand-alone”,sidebysideorontopof
eachother.Makesurethatenoughspace
isprovidedbetweenthecabinetsto
allowforventilation,maintenanceand
partsreplacements.
•Thethreecabinetscanbeinstalled
togetheronadedicatedframe.Thisisan
option,andtheframemustbeordered
separately.Theframeismounted
verticallyonthebulkheadbymeansof
shockabsorbers.
Procedure
1Observetheoutlinedimensions
drawingandthedetailsregardingthePowerSupplyUnit’sfootprint.
→PowerSupplyUnitoutline(311237)onpage181
→PowerSupplyUnitmountingframe(308337)onpage183
2Decidewhichofthetwoinstallationmethodsthatwillbeused.
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331549/B
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