Pump 1 is connected to Motor 1
Pump 2 is connected to Motor 2
Pump 3 is connected to Motor 3
Flow consumption versus pump status
Consumption Pump 1 Pump 2 Pump 3
Low VSD Off Off
↓ DOL VSD Off
High DOL DOL DOL
↓ DOL Off VSD
Low Off Off Off
↓ VSD Off DOL
High DOL VSD DOL
↓ DOL VSD Off
Low Off VSD Off
↓ VSD DOL Off
High DOL DOL VSD
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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