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Auto tuning of the PI controllers With auto tuning of the PI con trol lers, the drive monitors how the system reacts on corrections made by the drive – and learns from it, so that precise and stable operation is achie ved quickly.Gain factors for PI are conti nuously changed to compensate for changing characteristics of the loads. This applies to each PI controller in the 4-menu sets individually. Exact P and I settings at start-up will not be necessary – which lowers the commissioning costs. Dry Pump Protection and End of Curve Dry Pump Protection and End of Curve relate to situations where the pump runs without creating the de- sired pressure – as when a well runs dry or a pipe leaks.The drive sets off an alarm, shuts off the pump, or performs another programmed action. Sleep Mode In Sleep Mode the drive detects situa- tions with low or no fl ow. Instead of continuous operation it boosts the system pressure and then stops to save energy. The drive starts automatically when the pressure falls below the lower set point.

VLT® HVAC Drive FC 100 - 88 Dedicated pump features in VLT® HVAC Drive

The VLT® HVAC Drive off ers a vast number of pump-specifi c features developed in cooperation with OEMs, contractors and manufacturers around the world. Pump Cascade Control Option The Pump Cascade Control Option is the most sophisticated controller on the market. It distributes running hours evenly across all pumps, keeps wear and tear on individual pumps to a minimum and ensures that all pumps are in great shape. Vital water supply Vital water supply can be assured in the event of leakage or a broken pipe. For example overload is prevented by reducing speed – and supply is secur- ed at lower fl ow.
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