Select topology for your system
All the topologies include frequency converters (FC) to ensure variable speed operation. The FC provides full motor and pump controllability and protection. The switch is usually an automatic circuit breaker, though in certain cases it can be just a manual connector with fuses.
Drive train with just variable speed drive
This simple system topology can be used when it is possible to find a motor matching speed of the pump and when both, the motor and the FC, have similar voltage rating to that of the supply network (the grid).
Drive train with speed gearing
This solution can be used when for example the pump has too low rated speed to be matched by an available electric motor and the motor and the FC, have similar voltage rating to that of the supply network.
Drive train with voltage step down
In this solution the transformer is used for matching the voltage in the grid and FC's rated voltage and/or for galvanic insulation. It is possible to find a motor matching speed of the pump without any gearbox.
Drive train with voltage step-down and speed gearing
This solution can be used when the pump has too low rated speed to be matched by an electric motor, and the transformer is used for matching the voltage in the grid and FC's and/or for galvanic insulation.