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).

Specifications:

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).
Repeatability:	2%
Relay contacts:	Two functions - starter cut out and over speed, each has a single C/O contact 8A resistance loading, 4A inductive.
Ambient temp:	0-60C
Weight: -
Dimensions: -
Material/finish:	Fibre glass PCB, clear varnish protection.