ICMA S303 - Page 19

DIGITAL CONTROL UNIT FOR THERMAL
SOLAR SYSTEMS - Art. S303
DIGITAL CONTROL UNIT FOR THERMAL
SOLAR SYSTEMS - Art. S303
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TDST24M100SE 035912 111220
collector pump speed raises gradually until it reaches the
maximum set speed only after the ‘ TIME ’ period control
has elapsed.
If the differential temperature (∆Tr) measured between
the reference sensors is lower than the set differential
temperature (∆T) for the solar regulation, so the collector
pump speed is reduced until the minimum set speed is
reached only after the ‘ TIME ’ period control has elapsed.
If the central unit lowers the collector pump speed until
it reaches the minimum value %ON or VON and the ∆Tr
(differential between the sensors) is still lower than the set
∆T, so the pump turns OFF taking itself to the level %OFF
or VOFF.
Collector pump speed control time
Data Regulation range Default
TIME 1 .. 15 minuti 4 minuti
TIME parameter detail
Sets the maximum time used to drive the pump from the
minimum to maximum speed and vice versa, in order to
prevent abrupt changes or oscillations in the system
regulation.
Fixed mode temperature control
Data Regulation range
Default
T_FT 0 °C .. 90 °C 60 °C
Note: this parameter is active only when the option
MFT is selected under ‘MODE’ parameter.
In the following are listed the parameters and relevant default values
when parameter ‘ PUMP ’ is set to ‘ REV ’
Data Regulation range
Default
Parameters for PWM (PWM1) output
%OFF %ON .. 100% 100%
%ON %MAX .. %OFF 90%
%MAX 0% .. 50% 0%
%FMN 0% .. 100% 30%
Parameters for 0..10V (R010V) output
VOFF VON .. 10,0V 9,0V
VON VMAX .. VOFF 9,0V
VMAX 0,0V .. 5,0V 0,0V
VFMN 0% .. 100% 30%
In the following are listed the parameters and relevant default
values when parameter ‘ PUMP ’ is set to ‘ NOR ’
Data Regulation range Default
Parameters for PWM (PWM2) output
%OFF 0% .. %ON 0%
%ON %OFF .. %MAX 10%
%MAX 50% .. 100% 100%
%FMN 0% .. 100% 30%
Parameters for 0..10V (N010V) output
VOFF VON .. 10,0V 9,0V
VON VMAX .. VOFF 9,0V
VMAX 0,0V .. 5,0V 0,0V
VFMN 0% .. 100% 30%