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6.3 SPEED CONTROL R1 / R2
With speed control the LTDC makes it possible to vary the speed of connected pumps.
CAUTION
This function should only be activated by a specialist. Depending on the pump and pump stage used, the minimum speed should
not be set too low, because otherwise the pump or the system may be damaged. The information provided by the relevant manu-
facturer must also be observed! If in doubt, the min. speed and the pump stage should generally be set to high rather than too
low.
6.3.1 Modes
The following speed modes are available here:
Off:
There is no speed control. The connected pump is only switched on or off with full speed.
Mode M1:
After the purging time the controller switches to the set max. speed. If the temperature difference ΔT between the reference sensors
(collector and storage tank) is less than the set value, then the speed is decreased by one stage after the control time elapses. If the temperature
difference between the reference sensors is greater than the set value, then the speed is increased by one stage after the control time elapses.
If the controller has adjusted the speed of the pump down to the smallest stage and the ΔT between the reference sensors is ΔT off, the pump is
switched off.
Mode M2:
After the purging time the controller switches to the set min. speed. If the temperature difference ΔT between the reference sensors
(collector and storage tank) is greater than the set value, then the speed is increased by one stage after the control time elapses. If the temperature
difference ΔT between the reference sensors is below the set value, then the speed is decreased by one stage after the control time elapses. If the
controller has adjusted the speed of the pump down to the smallest stage and the ΔT between the reference sensors is TΔoff, the pump is switched
off.
Mode M3:
After the purging time the controller switches to the set min. speed. If the temperature at the reference sensor (collector) is greater than
the setpoint to be set subsequently, then the speed is increased by one stage after the control time expires. If the temperature at the reference sen-
sor (collector) is less than the setpoint to be set subsequently, then the speed is decreased by one stage after the control time expires.
Mode M4:
When the primary storage is loaded, speed control works as in M3.
When the secondary storage is loaded, speed control works as in M2.
Settings range: M1,M2,M3, M4, Off / Default: Off
6.3.2 Purging Time
During this time period, the pump is running with full speed (100%) to ensure trouble-free startup. After this time has passed, the pump is set to
speed control and is set to max. speed or min speed, depending on the speed control variant „6.3.1. - Modes“ on page 31 chosen. Purging time can
not be applied with PWM or 0-10V output.
Settings range: 5 to 600 seconds / Default setting: 8 seconds
6.3.3 Sweep Time
Sweep time determines the inertia of the speed control to prevent strong fluctuations in temperature. Sweep time is the timespan for a complete
change from minimum to maximum pump speed.
Settings range: 1 to 15 minutes / Default setting: 4 minutes
