KSB PumpDrive 2 - Page 101

8 Commissioning/Shutdown
101 of 212
PumpDrive 2
3-9-3-4
3-9-3-3
n
P
1
2
3
Fig.71: Setpoint compensation curve for dynamic pressure compensation based on
speed
1 Flow rate independent setpoint 2 Setpoint compensation
3 Compensated setpoint
The compensated setpoint (3) is the sum of the flow rate independent setpoint (1)
and setpoint compensation (2). The flow rate independent setpoint (1) is configured
as described in (ðSection8.6,Page70) . Setpoint compensation starts at speed n = 0
and reaches the value defined under Setpoint Compensation (3-9-3-4) at the Dyn
Press Setpoint Comp n Data Point (3-9-3-3) speed. Setpoint compensation continues
along the parabola shown. The Minimum Setpoint Compensation parameter (3-9-3-5)
can be used to define a minimum setpoint compensation value for opening swing
check valves.
Table72: Pressure/differential pressure control parameters with dynamic pressure compensation
Parameter Description Possible settings Factory setting
3-9-3-1 Dynamic Pressure Compensation Method
Selecting the dynamic differential pressure
compensation method (DFS). Dynamic
pressure compensation based on speed
can only be used for systems without a
geodetic head (e.g. in closed systems).
▪ OFF
▪ Speed
▪ Flow Rate
-
3-9-3-2 Dyn Press Comp Q Data Point
The setpoint compensation value is
reached at this point. Beyond that, the
setpoint is further increased with respect to
the specified value.
Minimum to maximum flow rate Dependent on the unit
set
3-9-3-3 Dyn Press Comp n Data Point
The setpoint compensation value is
reached at this point. Beyond that, the
setpoint is further increased with respect to
the specified value. Data is entered in % in
reference to Maximum Motor Speed
(3-2-2-2).
Referring to parameter 3-2-2-2
Maximum Motor Speed
0 %
3-9-3-4 Setpoint Compensation
Configurable setpoint compensation at
data point 3-9-3-2 or 3-9-3-3
Minimum to maximum limit of
measuring range
Dependent on the unit
set
3-9-3-5 Minimum Setpoint Compensation
Minimum setpoint compensation for
opening the swing check valve in the case
of low pump flow rates.
Minimum to maximum limit of
measuring range
Dependent on the unit
set