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∆T control
The controller works as a standard differential controller. If the temperature reach-
es or exceeds the switch-on temperature difference, the pump switches on. When
the temperature difference reaches or falls below the adjusted switch-off tempera-
ture difference, the respective relay switches off.
Note
The switch-on temperature difference must be 0.5 K higher than the
switch-off temperature difference. The set temperature difference must be
at least 0.5 K higher than the switch-on temperature difference.
Note
In systems with 2 stores or store loading in layers, 2 separate menus
(LOAD and LOAD 2) will be displayed.
Speed control
If the temperature difference reaches or exceeds the switch-on temperature differ-
ence, the pump switches on at 100 % speed for 10 s. Then, the speed is reduced to
the minimum pump speed value.
If the temperature difference reaches the adjusted nominal value, the pump speed
increases by one step (10 %). The response of the controller can be adapted via the
parameter Rise. Each time the difference increases by the adjustable rise value, the
pump speed increases by 10 % until the maximum pump speed of 100% is reached.
If the temperature difference decreases by the adjustable rise value, pump speed
will be decreased by one step.
Note
To enable speed control, the corresponding relay has to be set to AUTO,
MIN, MAX or ADAP (MAN channel) and relay control to PULS,
PSOL or PHEA (adjustment channel REL).
Store set temperature
The store set temperature can be adjusted in the S(2)SET channel.
Note
For more information about relay control, see page 42.
LOAD (2) 3/4
PUSH
DT(2) O
Switch-on temperature diff.
Adjustment range: 1.0 … 50.0 K
in steps of 0.5 K
Factory setting: 6.0 K
DT(2) F
Switch-off temperature diff.
Adjustment range:
0.5 … 49.5 K in steps of 0.5 K
Factory setting: 4.0 K
DT(2)S
Set temperature difference
Adjustment range:
1.5 … 50.0 K in steps of 0.5 K
Factory setting: 10.0 K
S(2)SET
Store set temperature
Adjustment range: 4 … 95 °C
Factory setting: 45 °C
a cb