Control Option Overview
MOTOVARIO – Mechanical Speed Variator. Manual Control only. Has 1:0:67 throughput reduction , so pump has to be sized with physically larger pumphead to give comparable flow rate to standard ( Fixed flow ) pump.
Typical Control range is 17-100% but some applications may call for a motor size/type which will only permit 28-100% control range.
Transmission losses typically require a larger motor (than standard) to be fitted in order to maintain same pressure performance.
MV, in most cases , is the least cost option we offer.
BETECH VFD – Electronic Speed Variator. Manual & Auto control. An ancillary electrical device used to control motor speed , not a drive-line component (unlike MV)
Motors on standard pumps are suitable for 3:1 turndown from 50Hz (or 4:1 turndown from 60Hz) i.e you can over-speed the standard pump by the 20% if required, to give 20% higher flow rates.
VAR-SPE- Hydrostatic Speed Variator. Manual control as standard , but can be offered with 4-20mA control package as option. 1:1 throughput , so no overall speed reduction (unlike MV ) so does not require a larger pump to give comparable max flow of fixed flow unit.
Typical control range is appx 3-100% , in most cases control down to 0% can be obtained but it is load dependent (variable) so we quote 3% minimum.
Transmission losses typically require a larger motor (than standard) to be fitted in order to maintain the same pressure performance.