KSB PumpDrive 2 - Closed Piping System; Based on Flow Rate

8 Commissioning/Shutdown
99 of 212
PumpDrive 2
Closed piping system
Q
p
Q
p
Q
∆p
1
2
3
Fig.68: Differential pressure control with dynamic pressure compensation in closed
system
1 Pump set with diagram of flow rate-dependent setpoint
2 Piping with diagram of pressure losses
3 Consumer with differential pressure diagram
The differential pressure of the pump (1) can be used in closed systems to achieve an
almost constant differential pressure at the consumer (3).
Two dynamic pressure compensation methods are available: "Dynamic pressure
compensation based on flow rate" and "Dynamic pressure compensation based on
speed".
NOTE
The parameter values and value ranges/units entered are mutually dependent. This
is why the first step in parameterising the frequency inverter is always to specify the
applicable value range and units (refer to parameter 3-11). If the value range or
unit is subsequently changed, all dependent parameters must be checked for
correctness again.
Based on flow rate
Dynamic pressure compensation is best realised based on the measured or estimated
flow rate. To this end, the Dynamic Pressure Compensation Method parameter
(3-9-3-1) is set to Flow Rate. The following diagram shows the setpoint compensation
curve (solid line) as a function of the flow rate and relevant parameters.