Constant period 40, Configuration level – West Control Solutions Pro-8 User Manual
Page 40
very weak. Moreover, the correcting variable increases very quickly to max. possi-
ble 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:
E.H2O: min. temperature for water cooling
(
PArA / Cntr)
t.on:
Pulse duration water cooling
t.off: min. pause water cooling
F.H2O: adaptation of (non-linear) characteristic
Water cooling
4.4.4
Heating and cooling with constant period (
CyCl= 3 )
The adjusted cycle times
t1 and t2
are met in the overall output range .
To prevent unreasonably short pulses,
parameter
tp is used for adjusting
the shortest pulse duration. With small
correcting values which require a pul-
se shorter than the value adjusted in
tp, this pulse is suppressed. Howe-
ver, the controller stores the pulse and
totalizes further pulses, until a pulse
of duration
tp can be output.
Parameters to be adjusted:
t1 : Min. cycle time 1 (heating) [s]
(
PArA/ Cntr)
t2 : min. cycle time 2 (cooling) [s]
tp:
min. pulse length [s]
Configuration level
Cooling functions
40
Pro-8
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
Effective
controller
output
50%
50%
t1 t2
/
tp
tp
30%
70%
20%
80%
10%
90%
t1 t2
/