INTRODUCTION
The GM-150 S.C.O. SPEED SWITCH is a panel mounted printed circuit board (PCB) assembly intended primarily for use as a sensor of starter motor cut out speed nominally 500 rpm on engines. The engine speed is determined by measuring the output frequency from a magnetic pickup mounted adjacent to the engine ring gear. When the engine rises above cranking speed an internal relay in the speed switch is energised. The operating point may be altered over a range by a screw driver adjusted potentiometer.
NOTE The GM-150 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 pump control systems etc…
SPECIFICATION
| Supply Voltage: | 12 or 24V DC (specify when ordering) |
| Signal Source: | Magnetic pickup sensing ring gear or other suitable frequency source – may be paralleled with a govenor. |
| Speed settings: | Screwdriver adjusted potentiometer (factory preset – 1000Hz) |
| Repeatability: | +/- 2% |
| On/off ratio: | 1 to 1 |
| Relay Contacts: | Single changeover, 8A resistive loading, 4A inductive. Diode suppression of transients is recommended. This contact should interupt pilot solenoid only. |
| Ambient Temp: | 0 – 60 degrees Celcius |
| Weight: | |
| Dimensions: | 86mm x 80mm |
| Material / finish: | Fibreglass PCB with solder mask and silkscreen overlay. |
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