31
Differential control
= keeps the temperature constant between two sensors.
Keeping the temperature difference constant between S1 and S2, for instance, allow for
“shifting” operation of the collector. If S1 drops due to lower irradiation, the difference be-
tween S1 and S2 thus drops. The control unit then lowers the speed, which increases the
dwell time of the medium in the collector and hence the difference between S1 and S2.
DC N12 Differential control in normal operation between sensors S1 and S2
(ex works = --).
Setting range: DC N12 to DC N32, DC I12 to DC I32)
DC -- = differential control is disabled.
DVD 7.5 The desired value for differential control is 7.5K. In the example, the tempera-
ture difference between S1 and S2 is maintained at 7.5K.
Warning: DVD always has to be greater than the switch-off difference of the
basic function. If the DVD is lower, the basic function of pump release blocks
before the speed control has reached the desired value. (ex works = 10K)
Setting range: 0.0 to 9.9K in increments of 0.1K
10 to 99K in increments of 1K
If the absolute value control (maintaining a sensor) and the differential control (maintaining
the difference between two sensors) are both active, the slower of the two speeds “wins out”.
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