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6.2.2 Type of pump
This menu is used to set the type of pump and the relative speed control.
Standard: speed control for standard pumps;
0-10V: speed control using 0-10V signal;
PWM: speed control using PWM signal
6.2.3 Pump menu
6.2.3.1 Pump
This menu allows the selection of preconfigured profiles for different pumps. In practice, the single settings remain acces-
sible even when a profile has been selected.
6.2.3.2 Output signal
This menu determines the type of pump in use: Solar pumps operate at their highest speed when the signal likewise is
at maximum strength, whereas conversely, heating pumps operate at their highest speed when the signal is at minimum
strength. Solar = normal, heating = inverted.
Settings range: Normal, Inverted / Default: see table.
6.2.3.3 0-10V Off
This voltage is delivered when the pump is off (pumps capable of detecting a cable break require a minimum voltage).
Settings range:
(Solar:) 0.0 to 5.0 V / Default: see table.
(Heating:) 5.0 to 0.0 V / Default: see table.
6.2.3.4 0-10V On
This voltage is needed to switch on the pump at minimum speed. Settings range: (Solar:) 0.0 to 5.0 V / Default: see table.
6.2.3.5 0-10V Max
This determines the output voltage for operation of the pump at maximum speed, used for example when purging the
system or in manual mode.
Settings range: (Solar:) 5.0 to 10.0 V / Default: see table.
6.2.3.6 Speed when On
This menu determines the speed of the pump as calculated and displayed on screen. For example, if the speed setting
selected here is 30% and the signal set to “PWM On/0-10V On”, the display will show “speed 30%”. When the signal is
“PWM max/0-10V On”, the display will show “speed 100%”. Everything in between is calculated accordingly.
Settings range: 10% to 90% / Default: see table.
6.2.4 Purge time
During this period, the pump will turn at full speed (100%) to ensure a troublefree start. Once the purge time has elapsed,
the pump is set to maximum or minimum speed, depending on the type of speed control selected under “6.2.1 - Modes”.
The purge time function cannot be applied with PWM or 0-10V output.
Settings range: 5 to 600 seconds / Default: see table.
6.2.5 Sweep time
This determines the inertia of the speed controI, in order to prevent significant fluctuations in temperature. The sweep time
is the time taken for the speed of the pump to progress from minimum to maximum rpm.
Settings range: 1 to 15 minutes / Default: see table.
6.2.6 Maximum speed
This is where the maximum speed of the pump is set. During the setting procedure, the pump runs at the selected speed
so that the flow rate can be determined.
Settings range: 70% to 100% / Default: see table.
b
The percentages indicated are guideline only, and could be higher or lower depending on the particular system.
6.2.7 Minimum speed
This is where the minimum speed of the pump at relay R1 is set. During the setting procedure, the pump runs at the se-
lected speed so that the flow rate can be determined.
Settings range: from “J.14.6 – Speed when On” to maximum speed minus 5% / Default: see table.
6.2.8 Setpoint
This value is the control setpoint. If the temperature at the collector drops below this threshold, pump speed is reduced.
If it rises above the threshold, pump speed increases.
Settings range: 0 °C to 99 °C / Default: see table.
6.3 Speed control R2
With the speed control provided by the XTDC, the rpm of pumps connected to the unit can be selectively varied.
b
The speed control function should be activated only by an expert service technician. Depending on the pump and
the pump stage used, the minimum speed should not be set too low, otherwise the pump or the system could be
damaged. Always follow the instructions provided by the manufacturer! If in doubt, it is preferable that the minimum
speed and the pump stage should be set conservatively high rather than too low.
Summary of Contents for SC SUN 300
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