HewTech Electronics LLC has developed a LOW-COST, low component count RPM  / FREQUENCY limiter switch.  

rev-limit1.JPG (37125 bytes)The Model RLS -10  has 2 individual / adjustable RPM / Frequency set-points.  Relay remains in a de-energized condition until the calibrated threshold is exceeded.  Once exceeded, the over-speed LED illuminates, the relay is energized and changes state.  Relay de-energizes once the RPM or Frequency has reduced below the calibrated set-point.  Relay is 10A SPDT and can be connected to motor control relays, kill-switches, alarms etc.  

Rotation pulses are monitored through any industry standard inductive proximity switch (NPN-type), however almost any "current sinking" configuration is compatible.   Typical upper RPM range is 7000 RPM's ~  50,000 RPM's, with 1 pulse per rotation.  Additional pulses per rotation, such as spokes or gear-tooth will allow much lower RPM's.  Minor changes to circuit configuration will allow unlimited range possibility.  

Typical uses include over-speed governor control on motors, fans, mixers, conveyors, grinders, blowers, generators, engines and other critical speed-sensitive devices and applications.

Power is 12 volts DC @ 2-watts.  Board dimensions are 2" x 3", with (4) #6 mounting hole positions.

Contact us for more information.

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HewTech Electronics LLC
Last Updated: August 10, 2006

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