36 Program features
pressure based flow feedback. The figure below shows the PQ performance curve of
the pump for the flow calculation function.
Notes:
• The flow calculation function cannot be used for invoicing purposes.
• The flow calculation function cannot be used outside the normal operating range
of the pump.
• Power points in PQ curve are expected to be in ascending order (P1 < P2 < P3 <
P4 < P5).
• Flow points in PQ curve are expected to be in ascending order (Q1 < Q2 <Q3 <
•Q4 < Q5).
Settings
Parameter group 80 Flow calculation (page 159).
Pump cleaning
The pump cleaning function is mainly used in wastewater applications to prevent
solid particles obstructions on the pump impellers or in the piping. This function
consists of a programmable sequence of forward and reverse rotations of the pump
and helps to remove any residue or rags on the impeller or piping.
Note: Pump cleaning function works only in remote mode.
The main features of pump cleaning function are:
• prevents blockages and decreases the need of manual cleaning
• increases the lifetime of the pump, pipes and impellers, and
• improves energy efficiency of the system.
Pump cleaning sequence
The drive starts cleaning with a pulse in the opposite direction of the running
direction. The speed step size is same for both positive and negative directions.
P [kW] or P
Q [m
3
/h] or Q
2
4
5
3
1
ACQ80 FW.book Page 36 Thursday, February 14, 2019 11:33 AM
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