The GM-012 DUAL SPEED SWITCH is a low cost printed circuit board (PCB) assembly for use as a starter motor cutout sensor and over speed switch on diesel prime movers. The engine speed is determined by measuring the output frequency from a magnetic pickup mounted adjacent to the engine ring gear. With rising motor speed the starter cutout relay will operate at a set point. Should the engine go into over speed an internal self-locking relay can only be released by interrupting the supply to the PCB.
NOTE: The GM012 is one of a range of low cost PCB assemblies designed for OEMs to assemble their own control cubicles for use with automatic standby diesel generator sets and fire pumps etc.
OPTION : The over speed switch can be non latching (specify when ordering).
|Supply voltage:||12 or 24V DC (specify when ordering).|
|Signal source:||Magnetic pickup sensing ring gear rotation. May be paralleled with governor.|
|Speed settings:||Screwdriver adjusted potentiometers – factory preset if number of ring gear teeth and speed settings are defined (factory presets — 1000Hz, 3000Hz).|
|Relay contacts:||Two functions – starter cut out and over speed, each has a single C/O contact 8A resistance loading, 4A inductive.|
|Material/finish:||Fibre glass PCB, clear varnish protection.|