West Control Solutions N8840 - Manual (Page 53)

4.6.5 Continuous controller (inverse)
ConF / Cntr: SP.Fn = 0 set-point controller
C.Fnc = 1 continuous controller (PID)
C.Act = 0 inverse action
(e.g. heating applications)
ConF / Out.3: O.tYP = 1 / 2 Out.3 type ( 0/4 … 20mA )
Out.0 = -1999...9999 scaling analog output 0/4mA
Out.1 = -1999...9999 scaling analog output 20mA
PArA / Cntr: Pb1 = 1...9999 proportional band 1 (heating)
in units of phys. quantity (e.g. °C)
ti1 = 0,1...9999 integral time 1 (heating) in sec.
td1 = 0,1...9999 derivative time 1 (heating) in sec.
t1 = 0,4...9999 min. cycle time 1 (heating)
PArA / SEtP: SP.LO = -1999...9999 set-point limit low for Weff
SP.Hi = -1999...9999 set-point limit high for Weff
g
For direct action of the continuous controller, the controller action must be
changed ( ConF / Cntr / C.Act = 1 ).
g
To prevent control outputs Out.1 and Out.2 of the continuous controller from
switching simultaneously, the control function of outputs Out.1 and Out.2 must
be switched off ( ConF / Out.1 and Out.2 / Y.1 and Y.2 = 0 ).
Configuration level
8840 profiler 53 Configuration examples
InH.1 InL.1 SP.LO SP SP.Hi
Out.3Â
InP.1Ê
20 mA
0/4 mA
PB1