Pump 1 - connected to Motor 1
Pump 2 - connected to Motor 2
Pump 3 - connected to Motor 3
Flow consumption versus pump status
Consumption Pump 1 Pump 2 Pump 3
Low VSD Off Off
Normal DOL VSD Off
Off DOL VSD
↓ VSD DOL Off
Normal DOL VSD Off
VSD Variable Speed Drive (yellow colour connecting line in the figure).
Controlled by drive, tuning the output speed according to PID control.
DOL Direct On Line (red colour connecting line in the figure). Pump is running
at fixed motor nominal speed.
Off Off-line. Pump stops.
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