Azbil DCP31 - Page 171

7-61
Chapter 7. PARAMETER SETUP
•Whensetto113,squarerootextractionisusedfortheMV.
•Whensetto114,theratetime(d,dd)andresettime(I,dI)settings
areinunitsof0.1s,andsquarerootextractionisusedfortheMV.
•Whensetto115,theratetime(d,dd)andresettime(I,dI)settings
areinunitsof0.01s,andsquarerootextractionisusedfortheMV.
•Whentheinput1rangetype(
C 0 3
)isanRTDinsetup241,Zener
barrieradjustment(
C 9 1
)isdisplayed.

C 9 1
(Input 1 Zener barrier adjustment)
ThefollowingadjustmentmustbemadewhenusingaZenerbarrier:
(1)TurntheDCP31OFF.Whenyouhavefinishedmountingand
wiringtheDCP31,short-circuitacrossAandBontheterminals
oftheRTD.
(2)TurntheDCP31ONagain,andsetsetupdata
C 9 0
setting to
241.Fordetailsonhowtochangesettings,see7-1Parameter
Setup(page7-1).
(3)Displaythesetupdata
C 9 1
setting.
(4)Press
ENT
todisplaythedifference(A—B)betweentheresistanc-
esoftheZenerbarrierconnectedtoleadsAandBonthelower
display.
(5) Press
ENT
tomemorizethedifference(A—B)betweentheresis-
tancestothecontroller.
(6) Press
DISP
tosettheDCP31tothebasicdisplaystate.
(7)TurnthepowerOFF,andremovetheshortacrossAandB.
Handling Precautions
• TheresistanceerroroftheZenerbarrierconnectedtoleadsA
andBcannotbeadjustedunlessitis20Ωorless.
• ThisadjustmentisnotrequiredwhenaZenerbarrierandan
inputotherthananRTDarenotused.
• OncetheZenerbarrierhasbeenadjusted,compensationiscar-
riedoutontheZenerbarrier.WhenusingonanRTDwithouta
Zenerbarrier,re-adjustwithouttheZenerbarrier.
• UsezenerbarriersrecommendedbyAzbil.
Recommendedzenerbarriers(forRTD)
ProductNo.8907/22-02/120(AzbilCorporation)
ProductNo.NZB3-1R75(NakamuraElectricMfg.Co.,Ltd.)
32
33
34
C
B
A
Zener barrier
Zener barrier
Zener barrier
DCP31
Short-circuit