Curtis Instruments 1234 - APPENDIX A: THEORY OF OPERATION; THEORY OF OPERATION

#URTIS-ANUAL/3 

3%4?).4%2,/#+
4HISFUNCTIONISUSEDTOENGAGETHESYSTEMINTERLOCKUSING6#,4HE)NTERLOCK
4YPEPARAMETERMUSTBESETTOINORDERFORTHE3ET?)NTERLOCKFUNCTIONTOOPERATE
)FTHESYSTEMINTERLOCKISSET)NTERLOCK?3TATEBITVARIABLE/NTHETHROTTLEINPUT
SIGNALISALLOWEDTOPASSALONGTHETHROTTLECHAINSEE&IGURE!DDITIONALLYIFTHE
MAINCONTACTORISUSED-AIN%NABLEPARAMETER/NSETTINGTHEINTERLOCK
WILLREQUESTTHEMAINCLOSEDSTATEFROMTHEMAINCONTACTORSTATEMACHINE4OVIEW
THECURRENTINTERLOCKSTATESEETHEMENU-ONITOR
w)NPUTS)NTERLOCK4OVIEWTHE
CURRENTMAINCONTACTORSTATESEETHEMENU-ONITORw#ONTROLLER-AIN3TATE
 7HENTHE)NTERLOCK?4YPEISSETTOANDNEITHERTHE3ET?)NTERLOCKNORTHE
#LEAR?)NTERLOCKFUNCTIONHASBEENCALLEDTHESTATEFORTHEINTERLOCKIS/FF)NTER
LOCK?3TATEBITVARIABLE/FF
3YNTAX 4FU@*OUFSMPDL
0ARAMETERS .ONE
2ETURNS
 n)NTERLOCKNOTSET
 n)NTERLOCKSUCCESSFULLYSET
%RROR#ODES .ONE
%XAMPLE 4FU@*OUFSMPDL
4HISWILLENGAGETHESYSTEMINTERLOCK
#,%!2?).4%2,/#+
4HISFUNCTIONISUSEDTODISENGAGETHESYSTEMINTERLOCKUSING6#,4HE)N
TERLOCK4YPEPARAMETERMUSTBESETTOINORDERFORTHE3ET?)NTERLOCKFUNCTION
TOOPERATE)FTHESYSTEMINTERLOCKISCLEARED)NTERLOCK?3TATEBITVARIABLE/FFTHE
THROTTLEINPUTSIGNALISNOTALLOWEDTOPASSALONGTHETHROTTLECHAINSEE&IGURE
!DDITIONALLY IF THE MAIN CONTACTOR ISUSED  -AIN %NABLEPARAMETER/N
CLEARINGTHEINTERLOCKWILLREQUESTTHEMAINOPENSTATEFROMTHEMAINCONTACTORSTATE
MACHINE4OVIEWTHECURRENTINTERLOCKSTATESEETHEMENU-ONITOR
w)NPUTS
)NTERLOCK4HE VIEWTHE CURRENT MAIN CONTACTOR STATE SEE THE  MENU -ONI
TORw#ONTROLLER-AIN3TATE
 7HEN THE )NTERLOCK?4YPE IS SET TO   AND NEITHER THE 3ET?)NTERLOCK NOR
#LEAR?)NTERLOCKFUNCTIONHASBEENCALLEDTHEDEFAULTSTATEFORTHEINTERLOCKIS/FF
)NTERLOCK?3TATEBITVARIABLE/FF
3YNTAX $MFBS@*OUFSMPDL
0ARAMETERS .ONE
2ETURNS
 n)NTERLOCKNOTCLEARED
 n)NTERLOCKSUCCESSFULLYCLEARED
%RROR#ODES .ONE
%XAMPLE $MFBS@*OUFSMPDL
4HISWILLDISENGAGETHESYSTEMINTERLOCK
6#,