Case Study: Pastoral Spray Irrigation As dairy conversions spread across the New Zealand countryside, the irrigation of pasture is increasing. Robindale Dairy Farm in Canterbury is one of many sites using AuCom soft starters to ensure optimal operation of their irrigation system. Robindale operates two giant centre pivot irrigators, each covering a 1.1 mile circle of prime pasture and taking 32 hours to complete one circuit. The irrigation system is fed by two bores which draw water from 525 feet underground, using 230 kW submersible pumps. When an irrigator is started, a soft starter activates the first 230 kW pump and water starts to fill the mainline and pivot. After 5 minutes the second pump, 3280 feet away, also starts, helping to fill the mainline and build system pressure. Both pump

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