West Control Solutions Pro-4 - Manual (Page 45)

4.4.3 Switching attitude non-linear ( CyCl= 2 )
With this method, the cooling power is nor-
mally much higher than the heating power,
i.e. the effect on the behaviour during transi-
tion from heating to cooling may be negati-
ve. The cooling curve ensures that the
control intervention with 0 to -70% correc-
ting variable is very weak. Moreover, the
correcting variable increases very quickly to max. possible cooling. Parameter F.H2O can
be used for changing the characteristic curve. The standard method (see section 4.4.1) is
also used for heating. Cooling is also enabled dependent of process temperature .
Parameters to be adjusted: F.H2O: adaptation of (non-linear) characteristic
( PArA / Cntr) Water cooling
t.on: Pulse duration water cooling
t.off: min. pause water cooling
E.H2O: min. temperature for water cooling
Configuration level
KS 90-1 / KS 92-1 45 Switching behaviuor
-95% -67% -80% -100% -92% -90% -87% -82%
t.off t.on
0
10
20
30
40
50
60
70
-100 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 -5
Controller output [%]
Water cooling non-linear, =1 F.H2O
Water cooling non-linear, =2 F.H2O
Water cooling non-linear, =0,5 F.H2O
Water cooling linear
Parameter:
t.on = 0.4 sec
t.off = 0.2 sec
E
ff
ective
controller
output