Flow Calculation - ABB ACQ80-04 Firmware Manual

Program features 35
Use of PID output as MTTP speed limit
In normal MPPT operation, the maximum pump speed defined in the parameter
79.52 Pump maximum speed is used as the maximum speed limit for MPPT
operation. When PID is enabled, the PID output generated by the PID set 1 (40.96) is
used as the speed limit instead of the defined maximum pump speed (79.52).
PID enabled
PID output in %, pump
maximum speed
(40.96)
MPPT speed limit
Pump maximum speed
(79.52)
Settings
Parameter group 79 Start stop control (page 155) and 40 Process PID set 1 (page
130).
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Flow calculation

The flow calculation function provides calculation of the flow without the installation of
a separate flow meter. The flow is calculated on the basis of parameter data such as
pump inlet and outlet diameters, pressure at pump inlet and outlet, height difference
of pressure sensors, and pump characteristics.
There are two types of flow calculation:
1. DI based flow calculation
The DI based flow calculation is used when the pump has sensors that provides
pulse count for each flow of one liter water. The drive performs the flow calculation
based on the inputs from the sensors.
2. PQ (power/flow) curve based flow calculation
In the PQ curve based flow calculation, the user can define a PQ (power/flow)
performance curve that is used as the basis for the calculation or a differential