ii
The Minarik Variable Frequency Drive (VFD) Series are
solid-state, variable-frequency AC motor drives. The VFD
utilizes a 115 or 230 VAC, 50/60 Hz, single-phase input,
and is factory calibrated for an output of 0 to 60 Hz. They
will operate any 1 HP or smaller, 115 or 208/230-volt, three-
phase-AC-induction, single-phase permanent split capacitor
motor (see page v) and can be user calibrated for 0 through
120 Hz output.
Although VFD inverters can operate over their full speed
range, most motors will operate with constant torque over a
10:1 speed range, 6 Hz to 60 Hz, and constant horsepower
above 60 Hz. (Inverter-duty motors may operate
satisfactorily over a 20:1 speed range.) Some motors can
be satisfactorily operated at speeds as low as 50 rpm
(speed range 50:1). Below 50 rpm, some motors may
show signs of “stepping” or “cogging”, and may run warmer.
*Although the VFD will allow a minimum of 0 Hz, the actual minimum
frequency is dependent on motor type and load. The motor may need to be
derated for low-frequency (30 Hz and lower) operation. Please consult the
motor manufacturer.
General Information
