16
Starting the System
Section 7 (continued)
Setting the Motor Overload Switches
TheMotorOverloadSettingSwitchesadjustthelevelofmotoroverloadcurrent
protectionnecessarytoprotectthemotorincaseofanovercurrentcondition.
Bank1switches1,2and3allowadjustmentofthemotoroverloadsetting.
Theseswitchesadjustthemotoroverloadprotectionasapercentageofthefull
loadoutputcurrentratingofthecontroller.Chooseamotoroverloadsettingthat
meetsorislessthanthemotor’sSFArating.Forexample,ifthefullloadoutput
currentratingofthecontrolleris37AandthemotorSFAratingis33A,themotor
overloadsettingshouldbesetto85%(33A/37A=89%,nextlowestsettingis
85%).
Inapplicationswherethepumpandmotorarenotusedtothefullcapacitythe
systemmaynotdrawcurrentclosetothemotor’sSFArating.Inthiscasechoose
amotoroverloadsettingthatisclosetotheactualfullloadrunningcurrent.
Note

Ifsinglephaseinputpowerisusedthemotoroverloadswitchesmustbesetto50%orloweror

nuisanceinputphaselosserrorscanresult.

Thechartbelowshowsthemotoroverloadsettingforeachmodel.
Motor Overload Setting
Supply Frame Model 100% 95% 90% 85% 80% 70% 50% 40%
Voltage Size Number
1 SPD20050 17.8 16.9 16.0 15.1 14.2 12.5 8.9 7.1
  SPD20050F       
  SPD20075 26.4 25.1 23.8 22.4 21.1 18.5 13.2 10.6
2 SPD20075F       
  SPD20100 37.0 35.2 33.3 31.5 29.6 25.9 18.5 14.8
  SPD20100F       
208/230 SPD20150 47.4 45.0 42.7 40.3 37.9 33.2 23.7 19.0
3 SPD20150F       
  SPD20200 60.6 57.6 54.5 51.5 48.5 42.4 30.3 24.2
  SPD20200F       
  SPD20250 76.0 72.2 68.4 64.6 60.8 53.2 38.0 30.4
4 SPD20250F       
  SPD20300 94.0 89.3 84.6 79.9 75.2 65.8 47.0 37.6
  SPD20300F       
  SPD40050 8.9 8.5 8.0 7.6 7.1 6.2 4.5 3.6
1 SPD40050F       
  SPD40075 13.2 12.5 11.9 11.2 10.6 9.2 6.6 5.3
  SPD40075F       
460 SPD40100 18.5 17.6 16.7 15.7 14.8 13.0 9.3 7.4
  SPD40100F       
2 SPD40150 23.7 22.5 21.3 20.1 19.0 16.6 11.9 9.5
  SPD40150F       
  SPD40200 30.3 28.8 27.3 25.8 24.2 21.2 15.2 12.1
  SPD40200F       
  SPD40250 37.5 35.6 33.8 31.9 30.0 26.3 18.8 15.0
3 SPD40250F       
  SPD40300 47.0 44.7 42.3 40.0 37.6 32.9 23.5 18.8
  SPD40300F       