KSB PumpDrive - 7.2.2.3.1 Flow rate estimation (for PumpDrive Advanced only); 7.2.2.3.2 Flow rate measurement

▪ Flow rate estimation based on power
▪ Flow rate estimation based on differential pressure
Whether the estimate is made using the power or the differential pressure as a basis
is determined – provided a differential pressure sensor is connected – in operation by
taking into account the maximum accuracy that can be achieved with either method
under the circumstances. The best method for the purpose is selected.
Flow rate estimation based on power
The flow rate should be measured without a pressure sensor being connected. The
maximum flow rate as per the pump characteristic curve (Q 100 % = Q
max
) is 24.5 m
3
/h
Table 76: Parameters for flow rate estimation based on power
Parameter Description Settings Factory setting
3-2-2-1 Setpoint unit bar %
3-2-2-2 Q unit m³/h m³/h
3-2-2-3 Pressure unit bar %
3-4-1-1 Q measurement Estimated Estimated
3-4-1-2 Q 100 % value 24,5 m³/h 0
3-8-2-11 AI 1 descriptor Process Process
3-8-3-11 AI 2 descriptor Process Process
3-12-1-1 Q measurement Measured Measured
Flow rate estimation based on differential pressure
Flow rate estimation via two pressure sensors in the discharge-side and suction-side
piping. The suction-side pressure sensor (0 - 1 bar/4 - 20 mA) must be connected to
analog input 1 and the discharge-side pressure sensor (0 - 2.5 bar/4 - 20 mA) must be
connected to analog input 2. The maximum flow rate as per the pump characteristic
curve (Q 100 % = Q
max
) is 24.5 m
3
/h.
Table 77: Parameter(s) for flow rate estimation via two pressure sensors in the discharge-side and suction-side
piping
Parameter Description Settings Factory setting
3-2-2-1 Setpoint unit bar %
3-2-2-2 Q unit m³/h m³/h
3-2-2-3 Pressure unit bar %
3-4-1-1 Q measurement Measured Measured
3-4-1-2 Q 100 % value 24,5 m³/h 0
3-8-2-1 AI 1 setting Current Voltage
3-8-2-4 AI1 Lo Current 4 4
3-8-2-5 AI1 Hi Current 20 20
3-8-2-6 AN IN 1 unit bar %
3-8-2-7 AN IN 1 Low 0 0
3-8-2-8 AN IN 1 High 1 0
3-8-2-11 AI 1 descriptor Pressure P1 Process
3-8-3-1 AI 2 setting Current Current
3-8-3-4 AI 2 low curr. 4 4
3-8-3-5 AI 2 high curr. 20 20
3-8-3-6 AN IN 2 unit bar %
3-8-3-7 AN IN 2 Low 0 0
3-8-3-8 AN IN 2 High 2,5 0
3-8-3-11 AI 2 descriptor P 2 pressure Process
3-12-1-1 Q measurement P/Q calculated Measured
Flow rate estimation via a differential pressure sensor (0 - 4 bar/4 - 20 mA) at analog
input 2. The maximum flow rate as per the pump characteristic curve (Q 100 % =
Q
max
) is 24.5 m
3
/h.
Table 78: Parameter(s) for flow rate estimation via a differential pressure sensor
Parameter Description Settings Factory setting
3-2-2-1 Setpoint unit bar %
3-2-2-2 Q unit m³/h m³/h
Example
Example 1
Example 2
7 Commissioning/shutdown
PumpDrive
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