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Special functions
7.2.1.1. - Speed when „On“
This menu determines the calculated and displayed speed of the pump. If e.g. 30% is
set here and the signal set in „PWM on/0-10V on“ is put out, 30% speed is displayed.
When the signal set in „PWM max/0-10V max“ is put out, 100% speed is displayed.
Everything in between is calculated accordingly.
7.3. - Speed control
7.3.1. - Speed control Modes
The following speed variants are available here:
Off: There is no speed control. The connected ventilator is only switched on or off with
full speed.
ModeV1: After the purging time the controller switches to the set max. speed. If the
temperature difference ∆T between the reference sensors (collector and sensor) 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 ventilator down to the smallest stage and
the ∆T between the reference sensors is ∆T off, the ventilator is switched off.
ModeV2: After the purging time the controller switches to the set min. speed. If the
temperature difference ∆T between the reference sensors (collector and sensor) 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 ventilator down to the smallest stage and
the ∆T between the reference sensors is T∆off, the ventilator is switched off.
Mode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.
During this time period, the ventilator is running with full speed (100 %) to ensure
trouble-free startup. After this time has passed, the ventilator is set to speed control
and is set to max. speed or min speed, depending on the speed control variant „7.2.1.
- Modes“ auf Seite 23 chosen. Purging time can not be applied with PWM or 0-10V
output.
7.3.2. - Purging time
Sweep time determines the inertia of the speed control to prevent strong uctuations
in temperature. Sweep time is the timespan for a complete change from minimum to
maximum ventilator speed.
7.3.3. - Sweep time
23


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