Protection against earthing faults and short circuiting. External controls available for manual pump-out and washing. The Varivac system consists basically of a Danfoss VLT5000 Frequency Converter which controls the vacuum pump electric motor speed in response to signals from a vacuum transmitter. The Danfoss VLT5000 is a logical choice as it has been factory-designed for PID control and has low electrical interference and emission. This is critical in dairy sheds where stray voltages of 1.5 Volt can seriously affect animal health and milking performance.
Cows are nearly fifteen times more sensitive to electricity than humans.