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REGULUS SRS6 EP Controller - www.regulus.eu
Danger
Special functions
menu 6
6.3 - Speed control R1 / R2
menu 6.3
With activated speed control the SRS6 EP makes it possible to vary the speed of a connected standard pump
wired to R1 relay by means of special internal electronics.
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 manufacturer must also be observed.
If in doubt, the min. speed and the pump stage should generally be set too high rather than too
low.
6.3.1 - Modes of speed control
menu 6.3.1
Off:
There is no speed control. The connected pump is only switched on or off with full speed.
Mode M1
Control to the set
Δ
T, starts from max. speed:
The pump starts at max. speed. After the purging time the controller switches to the set max. speed. If the
temperature difference
Δ
T between the reference sensors (collector and storage tank) is less than the set
value, then the speed is decreased by one stage after the Sweep 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 Sweep time elapses. If the controller has adjusted the speed of the pump down to the smallest stage and
the
Δ
T between the reference sensors is less than
Δ
T off, the pump is switched off.
Mode M2
Control to the set
Δ
T, starts from min. speed:
The pump starts at min. speed. After the purging time the controller switches to the set min. speed. If the
temperature at the collector sensor (or relay R2 in variants with a heat exchanger) is greater than the Setpoint,
then the speed is increased. If the temperature at the collector sensor is less than the Setpoint, then the speed
is decreased.
Mode M3
Control to constant collector temperature, starts from min. speed:
The pump starts at min. speed. After the purging time the controller switches to the set min. speed. If the
temperature at the collector sensor is higher than the Setpoint, then the speed is increased by one stage after
the Sweep time elapses. If the temperature at the collector sensor is lower than Setpoint then the speed is
decreased by one stage after the Sweep time elapses.
Mode M4
If the storage tank of the highest priority is heated to the desired temperature, then the speed con-
trol works by mode M3. If the (secondary) storage tank of a lower priority is heated to the desired temperature,
then the speed control works by mode M2.
Settings range: M1, M2, M3,M4, off / Default setting: off
6.3.2 Purging time
menu 6.3.2
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 chosen (M1-M4, see 6.3.1).
Settings range: Purging time 5-600 sec. / Default setting: 8 sec.
6.3.3 Sweep time
menu 6.3.3
Sweep time determines the inertia of the speed control to prevent strong
fl
uctuations in speed and subse-
quently in temperature. The meaning of the parameter is described above.
Settings range: Sweep time 1-15 min. / Default setting: 4 min.
