Collector alarm
If this temperature at the collector sensor is exceeded when the solar pump is turned on, a warning or error notification is
triggered. There is a corresponding warning in the display.
Pressure Monitoring
In this menu, the system pressure monitoring can be activated through a direct sensor. Once the set pressure conditions are
exceeded, a message is generated and the LED flashes red.
6. Special Functions
Used to set basic items and expanded functions.
The settings in this menu should only be changed by a specialist.
Program selection
Here the hydraulic variation fitting to the respective use case is selected and set.
The program selection normally occurs only once during the first entry into service by a specialist. An incorrect pro-
gram selection may lead to unpredictable errors.
Pump settings
Settings from the 0-10V or the PWM pump can be made in this menu.
When this menu is selected, you may receive a request to save the speed settings.
Signal type
The type of device to be controlled is set here.
0-10V: Controlled by a 0-10V signal.
PWM: Control by means of a PWM signal.
Pump
In this menu, the preset profiles for the pump can be selected or under “manual” all settings can be done personally. The settings
can still be changed after a profile has been selected.
Speed control
If the speed control is activated, itLTDC offers the possibility through a special internal electronic system to change the speed of
pumps depending on the process. The relay R1, R2 and the Pwm and 0-10V outputs can work with the speed controlled.
This function should only be activated by a technician. Depending on the pump being used and the pump level, the
minimum speed may not be set too small, because the pump or the system may be damaged. The specifications from
the affected manufacturer must be observed for this! When in doubt, the min. speed and the pump level should be set
too high instead of too low.
Variant
The following speed variants are available here:
Off: There is no speed regulation. The connected pump is only turned on or off with full speed.
Mode M1: The controller changes to the set max. speed after the purging time. If the temperature difference ∆T between the ref-
erence sensors is below the set switch on temperature difference ∆T R1, the speed will be reduced. If the temperature difference
between the reference sensors is above the set switch on temperature difference ∆T R1, the speed will be increased. If the con-
troller has decreased the speed of the pump to the smallest level and the ∆T between the reference sensors is still only ∆Toff, the
pump will be turned off.
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