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12.9 Speed control
menu 7.9
If the speed control is activated, the TDC3 makes it possible to vary the speed
of standard pumps at relay R1 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.
Special functions
menu 7
12
12
The following speed variants are available here:
Off:
There is no speed control. The connected pump is only switched on or off
with full speed.
Variant V1:
After the purging time the controller switches to the set max. speed.
If the temperature difference
∆
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 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
∆
T between the reference
sensors is still only 1/3 of the set value, then the pump is switched off.
Variant V2:
After the purging time the controller switches to the set min. speed.
If the temperature difference
∆
T 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
∆
T 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
∆
T between the reference sensors
is still only 1/3 of the set value, then the pump is switched off.
Variant V3:
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 sensor (collector) is less than
the setpoint to be set subsequently, then the speed is decreased by one stage
after the control time expires.
Setting range: V1,V2,V3, off/default setting: off
12.9.1 Variant
menu 7.9.1
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 to high
rather than too low.
Caution