SELECTION:
The horsepower range of the PHASE-A-MATIC static
converter is determined by the minimum and maximum
starting current applied to it at any one time. The largest
motor on your machine, or the idler motor, if used, must fall
within the minimum and maximum horsepower range marked
on the PHASE-A-MATIC static converter. However, after
the first motor (or “idler motor”) has started, motors below
the minimum range may then be started and can usually be
left running as the main motor is stopped and started. Do not
add the horsepower of the power feed, coolant pump, etc.
These rely on the generator effect of the main motor. The
only time you would add the horsepower of two or more
motors together would be if they always start at exactly the
same time. Do not install a larger size or Heavy Duty series
PHASE-A-MATIC static converter thinking it will give you
more horsepower. A static converter that is too large will not
work properly and may cause damage.
Two-speed motors are dual horsepower. Select the
PHASE-A-MATIC static phase converter with minimum and
maximum horsepower ratings, which fall within or very close
to the minimum and maximum horsepower of the motor. For
example: A 1.5 HP 3450 RPM motor is ¾ HP at 1725 RPM.
Some European soft-start motors draw less starting current
than normal and therefore require a smaller than normal
converter. Most Taiwanese and Chinese motors draw greater
amperage to start than normal. Therefore, for these motors
we recommend model PAM-600HD for a 3 HP motor; model
PAM-900HD for a 5 HP motor; model PAM-1200HD for a 7.5
HP motor, etc.