Description

The SS300 Series are single set point speed switches with SPDT relay dry con- tact output. The trip point is set by a potentiometer. An LED indicates when the signal source is present. A second LED turns on when the trip point is reached. An optional time delay is on board to delay operation of the relay for 2-6 seconds after the set point has been reached.

The SS300 Series speed switch is intended for installation within a weather- proof enclosure to protect it from rain, dust, etc.

Application

Overspeed shutdown: Shuts down the engine if RPM exceeds the pre-set limit.

Speed sensitive pull-in/drop-out: Engage or disengage PTO’s, 4-wheel drives, other switch points, etc. according to speed of engine being monitored.

Engine and transmission alarms/shutdowns: Oil pressure in some engines and transmissions varies widely between running and idle speeds. The SS300 Series can select between two pressure switch set points according to speed of the engine or transmission and thus give maximum protection to the equipment while at operating RPM and eliminate nuisance alarms when at idle.

Adjustable differential model: The (“AD”) can be adjusted to change the speed range over which the pull-in and drop-out differential of the relay will operate. A typical application is to insure that engine speed is above a minimum RPM before applying a load but allows a drop in speed of several hundred RPM with- out disconnecting the load.