DC Controls
PWM
Pulse Width Modulated (PWM) controls are available in NEMA 1 and chassis style units for sub-fractional HP frame motors from 1/40 HP through ¼ HP. Due to their improved form factor, these PWM controls result in quieter operation, lower operating motor temperatures, longer brush life and greater motor overload capacity than for the same motor on an SCR type control.
SCR
These are General Purpose drives designed for use with Permanent Magnet or Shunt wound DC motors. NEMA 1 enclosed drives are suitable for most industrial applications. The NEMA 4X controls are best suited for washdown or outdoor installations or for extremely dusty applications.
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