The “off” time is varied dependent of output value. Parameter
t.off
is used for
determining the min “off” time. For output of a shorter off pulse, this pulse is
suppressed, i.e. the max. effective cooling output value is calculated according to
formula
t.on
/ (
t.on
+
t.off
)
w
100%.
Parameters to be adjusted:
E.H2O
: minimum temperature for water cooling
(
PArA
/
Cntr
)
t.on
:
pulse duration water cooling
t.off
: minimum pause water cooling
4.4.3
Water cooling non-linear (
CyCl
=
2
)
With this method, the cooling power
is normally much higher than the
heating power, i.e. the effect on the
behaviour during transition from
heating to cooling may be negative.
The cooling curve ensures that the
control intervention with 0 to -70%
correcting 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
Operating manual MIR-491
41
MIR-491 cooling functions
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
-95% -67% -80% -100%
-92%
-90%
-87%
-82%
t.off
t.on
Содержание MIR-491
Страница 70: ...12 Notes Notes 70 Operating manual MIR 491...
Страница 71: ...Notes Operating manual MIR 491 71...
Страница 72: ...Notes 72 Operating manual MIR 491...
Страница 73: ...Notes Operating manual MIR 491 73...
