EnerSys Alpha Cordex CXC HP - Calibrate Shunts, Current Transducers, and Temperature Probes

Cordex®CXCHPControllerSoftwareManual|21-Maintainingmodules
21.1.4. Calibrate shunts, current transducers, and temperature probes
Thissectioncoversthecalibrationofshunts,currenttransducers,andtemperatureprobesthatare
connectedtoADIOmoduleinputs.
21.1.4.1. Shunt calibration
Notice: Calibration is considered an expert user task.
Tocalibrateashuntcorrectly,youneedhardwaretogenerateandmeasuretheinputsignalaccurately.
ThistopiccovershowtodoaSingle-Point Calibration.IfyouneedtodoaSlope/Offset Calibration or
aTwo-Point Calibration,afactorycalibrationdocumentshouldbewrittenshowing,step-by-step,how
boththehardwareandthesoftwareneedtobeusedtoperformanaccuratecalibration.
AshuntCurrent readingiscalculatedasfollows:
Current
(
A
)
=
ADIO
Current
Input
Reading (
mV )
Range
in
Millivolts
(
mV
)
×
Range
in
Amps
(
A
)
+
Offset
(
A
)
To perform a single-point calibration on a shunt:
1. GotoSystems > DC System > Inventory > Shunts andselecttheGO TO buttontoselectoneof
theavailableshunts.
2. SettheOffset tozero.
3. Measuretheactualcurrentflowinginamps.Itmaybeeasiesttodothismeasurementat0.0amps.
4. Recordthemeasuredvalue:____________A.
5. Subtractthedisplayedvalue:____________A,fromthewebinterface.
6. Calculatethenewoffset:_____________A.Offset=MeasuredValue-DisplayedValue.
7. SelecttheEDIT buttonoftheOffset field.EnterthenewoffsetinampsandselectSave.
8. VerifythattheOffset fieldwasupdated,andthatthenewdisplayedvaluematchesthemeasured
value.
21.1.4.2. Current transducer calibration
Notice: Calibration is considered an expert user task.
Tocalibrateacurrenttransducercorrectly,youneedhardwaretogenerateandmeasuretheinputsignal
accurately.
ThistopiccovershowtodoaSingle-Point Calibration.IfyouneedtodoaSlope/Offset Calibration or
aTwo-Point Calibration,afactorycalibrationdocumentshouldbewrittenshowing,step-by-step,how
boththehardwareandthesoftwareneedtobeusedtoperformanaccuratecalibration.
AcurrenttransducerCurrent readingiscalculatedasfollows:
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