Manual

14
BRAY Series 70 Servo Pro
Operation and Maintenance Manual
switches1,2and3.RefertothecongurationSwitch
ChartinSection2.2.
Thepotentiometercommandsignaloptionisusefulto
demonstrateanactuatorequippedwithaServoProwhen
a4-20mADCcalibrationdeviceisunavailable.
caution
Donotconnectanyhighvoltagepowertothecommand
signalinputterminalsasdamagecouldresult.
notice
Shielding
Signal/communicationlinesshouldbeshielded.Shield
mustbegroundedatoneendonly,preferablyatthe
controller. Grounding the shield at more than one
locationcanintroducenoiseinthecircuitrybyforming
groundloops.
ThecommandsignalsuppliedtotheServoPromust
beisolatedfromallotherexternalcircuits.
5.1.3 outPut signal terminals
TheServoProsuppliesanoutputsignalthatrepresents
thecurrentpositionoftheactuator.Thecustomerwires
theoutputsignaltoaninputoftheirprocesscontroller.
Theoutputsignalhaspolaritythatmustbeobserved.
Connectthepositiveconductoroftheoutputsignaltothe
OUTPUT(+)terminal.Connectthenegativeconductorof
theoutputsignaltotheOUTPUT(-)RETURNterminal.
Theoutputsignalhasfourdifferentranges selectable
throughcongurationswitches.Theavailablerangesare:
4-20mADC
0-5VDC
0-10VDC
TheoutputsignalissometimescalledtheRetransmission
signal,orpositionfeedbacksignal.
Theoutputsignaliscalibratedbythemicroprocessorat
thesametimethecommandsignaliscalibrated.
caution
Donotconnectanyhighvoltagepowertotheoutput
signalterminalsasdamagecouldresult.
The Servo Proprovides anactive (powered)output
signal.Donot apply any additionalpower source to
thiscircuit.
notice
TheoutputsignalsuppliedbytheServoProisdesigned
todriveanimpedanceofapproximately250Ω,upto
amaximumof500Ω.
The output signal should be isolated from all other
externalcircuits.
Theprocesscontrollerreceivingtheoutputsignalshould
beadjustedtoallowfora+/-2%variance.
ThereisnochangeintheoutputsignalrangeifReverse
Acting mode is selected. The output signal always
operatesinForwardActingmode.
5.1.4 HandWHeel sWitcH terminals
TheServoPromonitorsthepositionoftheactuatormanual
overridehandwheelthroughswitchesconnectedtothe
handwheelterminals.
The wiring to the handwheel terminals is connected
atthefactoryandshouldnotrequireanyadjustmentby
thecustomer.
notice
If the actuator handwheel is engaged (pulled fully
outward) the Servo Pro cannot power the actuator
motorineitherdirection.
Theactuatorhandwheelmustbedisengaged(pushed
fullyinward)fortheServoProtopowertheactuatormotor.
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