Pulsafeeder MPC Vector - Manual (Page 52)

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Motor Selection and Requirements
General Specifications
All motors used with the MPC VECTOR controller must meet these minimum specifications:
• 230 VAC, 50 or 60 Hz 3-phase input power AC induction motor
• 1800 rpm (60 Hz) or 1500 rpm (50 Hz) synchronous speed
• Service Factor 1.05 or greater
• Class F Insulation (minimum)
• Refer to your equipment specifications and documentation for the correct frame size
• Motors may or may not need feet and/or a C-face mount depending on equipment
Turndown Requirements
Motor turndown ratings are dependent on the application and intended use of the pump. Users should understand and
take into account the following factors when considering motor selection:
• Application required turndown ratio
• Viscosity of pumped liquid
• Length of wiring between the MPC VECTOR controller and the pump (motor)
Application Required Turndown Range
Liquid Viscosity 4:1 10:1 20:1
Low, below 50 CPS 3:1 or 4:1 N/A (see note below) Consult factory
High, above 50 CPS 3:1 or 4:1 10:1 Consult factory
NOTE: when pumping liquids with low viscosity, pump performance is greatly diminished at slow rotational speeds due
to internal slip. Therefore, high speed turndown ratios are not expected in this type of application.
Cable Length Minimum Required Motor Turndown Rating
MPC VECTOR to motor less than 25
feet (7.6 meters)
Use ratings guidelines in chart above
4:1 or 10:1 turndown 20:1 turndown
MPC VECTOR to motor greater
than 25 feet (7.6 meters) Must use 10:1 inverter duty
rated motor
Consult factory
NOTE: the maximum pump to controller distance is 100 feet (30.5 meters). If longer distances are required, please
contact the factory. Line and load reactors can be utilized to allow operation over longer distances.