Additional functions
54
Pump speed processor
A 2
–
absolute value control
: Sensor
T2
being kept constant by
pump speed. The speed increases as temperature
T2
does.
A-2
means that speed increases as temperature
T2
drops (= inverse
mode)
ew
= A 0 (switched off)
c60
– desired value for absolute value control: When “
A
” is activated,
the controller tries to keep constant the sensor „
A
“ at the value „
c
“ (e.g.
60°C).
ew
= 50
F13
–
differential control
: Keeping the temperature difference con-
stant between
T1
and
T3
.
T1
is the warmer sensor. Speed increases, if
difference between
T1
and
T3
does. Inverse
F
means inverse mode.
ew
= F 0 (switched off)
d5.8
– desired value for differential control. When “
F
” is activated, the
controller tries to maintain the difference between the two sensors un-
der ”
F
” at the value „
d
“ (e.g. 5.8K).
ew
= 10
L31
– limiter function: If the sensor
T3
increases the set limit „
b
“, the
controller tries to maintain the sensor
T1
at the maximum value „
h
“.
ew
= L 0 (switched off)
b75
– limiter value: If sensor „
L
“ (e.g.
T3
) exceeds the maximum „
b
“
(e.g. 75°C), the controller tries to maintain the second sensor (e.g.
T1
)
at the temperature „
h
“.
WE
= 60
h85
– maximum value: After occurring the event “
b
” the second sensor
(e.g.
T1
) will be kept constant at the maximum value (e.g. 85°C). “
h
”
are temperatures below 100°C, but “
H
” is more than 100°C.
ew
= H30 (=130°C)
Pr8
– proportional part (amplification of controlling): The speed is
changed by one increment for each 0.
8
K of deviation from the desired
value. A large number leads to a more stable system but also to more
deviation from the predefined temperature.
ew
= 5
In4
– integral part: For each
1
K of deviation from the desired value, the
speed changes one increment every
4
seconds. A large number pro-
vides a more stable system, but it then takes longer to reach the de-
sired value.
In0
= no integral part,
ew
= 5
di5
– Differential part: The faster a deviation occurs between the de-
sired and the current value, the greater the short-term overreaction will
be to provide the fastest compensation possible. If the desired value
deviates at a rate of 0.
5
K per second, the speed is changed by one in-
crement. Large numbers provide a more stable system, but it then
takes longer to reach the desired value. Optimal values depend on the
system and have to be checked experimentally.