Farmers irrigate their fields during periods of dry weather to ensure normal growth. As the irrigators are driven by the water flow, constant pressure is essential for even water distribution over the fields.
The irrigation system contains a frequency converter and eight parallel submersible pumps. The submersible pumps feed water to the irrigators, which are mounted on lightweight carriages. The carriages are first pulled across a field, then slowly dragged back by the water supply hoses rewinding onto large reels. As the reels are powered by flowing water, the pressure has to be constant to ensure an even water distribution.
Irrigation system
The speed of one pump motor is controlled by an AC drive, which also switches on the fixed-speed pumps as required. Another fixed-speed pump is started and the speed of the frequency converter driven pump is correspondingly reduced when the pressure in the pipeline falls below a preset limit. Conversely, the pumps are stopped sequentally when the pressure exceeds an upper limit.
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