Basic control functions
Basic control functions are available depending on the application.
Select control functions using the settings assistant:
- Differential pressure ∆p-c
- Differential pressure ∆p-v
- Index circuit ∆p-c
- Dynamic Adapt plus (factory setting at the time of delivery)
- Volume flow constant (Q-const)
- Multi-Flow Adaptation
- Temperature constant (T-const)
- Differential temperature (∆T-const)
- Speed constant (n-const)
- PID control
Constant speed (n-const / constant speed)
The speed of the pump is kept at a set constant speed.
Differential pressure ∆p-c
The control keeps the differential pressure created by the pump constant above the permitted flow rate at the selected differential pressure setpoint Hsetpoint up to the maximum characteristic curve.
Index circuit ∆p-c
“Index circuit ∆p-c” function is used to control a distant measuring point with an external differential pressure sensor. In this process, so-called ∆p-c control is applied.
This function is suitable to ensure a differential pressure at a distant point in the system.
Differential pressure ∆p-v
This control mode triggers a linear change in the differential pressure setpoint the pump must ensure between reduced differential pressure H and Hsetpoint.
Consequently, controlled pressure H increases or decreases with the flow rate.
The slope of ∆p-v characteristic curve can be adjusted to the respective application by setting the percentage of Hset (slope ∆p-v characteristic curve).
Options “Nominal duty point Q” and “Slope of ∆p-v characteristic curve” are available in the context menu [•••] of the setpoint editor “∆p-v differential pressure setpoint”.
- Nominal duty point Q:
The optionally configurable nominal duty point significantly simplifies adjustment by adding the required volume flow at the design point.
The additional input of the required volume flow in the design point ensures that the ∆p-v characteristic curve runs through the design point.
The pitch of the ∆p-v characteristic curve is then optimised.
- Gradient of the ∆p-v characteristic curve:
A reduction factor can be set at the pump to improve adjustment of the ∆p-v characteristic curve.
The reduction factor reduces the ∆p-v delivery head for 0-volume flow. A reduction factor of 50 % (H/2) is normal.
Some applications involving the classic ∆p-v characteristic curve may be affected by excessive/insufficient supply if the total volume flow demand has been reduced. The excessive or inadequate supply can be compensated by adjusting this factor:
• In case of inadequate supply in partial load range, the value must be increased.
• In case of excessive supply in partial load range, the value must be reduced. More energy can be saved and flow noises are reduced.
Dynamic Adapt plus (factory setting)
The control mode Dynamic Adapt plus autonomously adjusts the pump output to the requirements of the system. A setpoint adjustment is not required.
The pump continuously adjusts its delivery rate to the requirements of the consumer and status of the open and closed valves and thus significantly reduces the set pump energy.
Temperature constant (T-const)
The pump constantly adjusts to a set temperature Tsetpoint.
The actual temperature to be regulated is captured by
- the internal temperature sensor or
- an external temperature sensor which is connected
- to the pump.
Differential temperature constant (∆T-const)
The pump controls to a set differential temperature ∆Tsetpoint (e.g. difference from feed and return temperature).
Actual temperature through:
- the internal temperature sensor and an external temperature sensor.
- two external temperature sensors.
Volume flow constant (Q-const)
The pump controls a set volume flow Qsetpoint in its characteristic curve.
Multi-Flow Adaptation
A primary pump collects the volume flow requirements of the connected secondary pumps (e.g. to a distributor) with “Multi-Flow Adaptation” through a Wilo Net connection.
The primary pump supplies the total volume flow of the secondary pumps into the distributor.
Set an amplification factor (80 – 120 %) and a fixed volume flow rate to adapt supply to local circumstances. The fixed volume flow percentage is always calculated for the calculated volume flow.
User-defined PID control
The pump controls based on a user-defined control function. PID control parameters can be manually specified.
For further information about setting the control modes and the associated parameters, see the “Pre-defined applications in the settings assistant” section.