User Manual

Rev5 MN890570 19of30
WIRING StepEight
Switching Inductive Loads:The use of suppressors (snubbers) is strongly recommended when switching
inductiveloadstopreventdisruptingthemicroprocessor’soperation.Thesuppressorsalsoprolongthelife of
therelaycontacts.SuppressioncanbeobtainedwithacatchdiodeforDCcircuitsandaresistor‐capacitor(RC)
forACcircuits.
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CatchDiode
 Alwaysusestepperrelaysbetweenthesensorandexternalloads.
ForDCcircuitsuseacatchdiodesuchas1N4148,shownonleft.
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RefertothefollowingcircuitsforRCnetworkassemblyandinstallation:
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ChooseRandCasfollows:
 R:0.5to1Ohmsforeachvoltacrossthecontacts
 C:0.5to1μFforeachampthroughclosedcontacts
Notes:
1. Usecapacitorsratedfor250VAC.
2. RCnetworksmayaffectloadreleasetimeofsolenoidloads.Check
toconfirmproperoperation.
3. InstalltheRCnetworkatthemetersrelayscrewterminals.AnRC
networkmayalsobeinstalledacrosstheload.Experimentforbest
results.
VoltageOutput:SeriesULScanbeusedasa0to5or0to10VDCoutputdevice.Aresistorwillneedtobe
addedtothecircuittoenableavoltageoutput(refertothewiringdiagrambelow).
 0‐5VDCoutput
o Adda250Ohmresistor
o Actualoutputwillbe0.8to5VDC
 0‐10VDCoutput
o Adda500Ohmresistor
o Actualoutputwillbe2to10VDC
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WhenusingULSX‐CAL,underNumber
ofPumps,select4‐20mATransmitterOnlytosimplifytheconfiguration
inULSX‐CAL.
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