Very high inflow
The start level of pump 2 is low and the start level of pump 3 is high. If the inflow is very
high, then pump 2 starts and increases the speed to the maximum frequency. Pump 1
starts to pump and increases the total outflow, when pump 2 reaches its maximum
frequency. Pump 1 increases the speed to maximum frequency, shortly thereafter pump 3
starts to pump. Pump 3 increases the speed to maximum frequency when the level is just
over start level that is set in P1-15:Start level parameter. Over the start level all three
pumps runs at maximum frequency in an effort to reduce the water level to the stop level.
As the level decreases , the pumps will drop to their respective energy frequency as they
reach their individual start levels.
1. Pump 3, start level high
2. Pump 1, start level
3. Pump 2, start level low
4. Stop level
5. Energy frequency
6. Maximum frequency
Energy minimizer
The drive calculates the optimal speed using this function.
The function calculates the optimal speed for the specific system. The value for optimal
speed changes with 1 Hz per pump cycle when the pump is active. Depending on the
system and the number of pump cycles the calculation can take hours before the optimal
speed is found.
System Setup and Operation
SRC 311 - SmartRun
™
Installation, Operation, and Maintenance Manual 37
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