Speed Switch

On application of power to the input, the internal relay is energized and a time interval starts. If there is motion being sensed, pulses will be present at the sensing input, and the timer will be reset on each pulse.

Should motion stop, the unit will time out and de-energize the internal relay. If the pulses restart, the relay re-energizes and the timer resets.


PS-112 Adjustable Speed Sensor

On application of power to the input terminals, the PS-112 begins sensing the repetition rate of the pulses being generated by the proximity switch.

If the pulse rate is lower than the set-point adjustment, the internal relay remains deactivated. If the pulse rate is higher than the set point, the internal relay activates.



The PS-119 Anti-Plugging Zero Speed Switch requires 115 VAC 50 or 60 HZ as a power source and works off the back EMF or generated voltage of a coasting motor as a sensing input.

As soon as the motor comes to a complete stop, the Zero Speed Switch senses the absence of back EMF and allows the motor to be started in either reverse or forward direction. Whenever the motor is rotating (regardless of applied power or momentum) the output of the MRS-1R module is de-energized and the motor ceases turning the output turns on.

The speed at which the output will turn on can be adjusted by a knob on this module. The MM11 memory module, allows you to restart instantly in the same direction of rotation if the motor is coasting, but prevents a restart in the opposite direction.

PS-127A Voltage Sensor

The PS-127A is a unique voltage-sensing device since even though the sensitivity is in millivolt range, the sensing terminals will accept up to 600 Volts over voltage.

This feature lends the PS-127A to be used as a Zero Speed Switch monitoring the Back EMF generated by a coasting motor.

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P.O. Box 427
Lawrenceburg, TN  38464
Office:  (931) 762-8773
Fax:  (931)766-0083

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