Guardian Technologies 4270 manual Section ENGINE DC CONTROL SYSTEM, Circuit Condition- Cranking

Section 5

ENGINE DC CONTROL SYSTEM

CIRCUIT CONDITION- CRANKING:

When the START-STOP-SWITCH (SW1) or REMOTE PANEL START-STOP-SWITCH is held at "START" position, Wire 17 from the Engine Control circuit board is connected to Ground. Engine control circuit board action will then deliver battery voltage to a STARTER CONTACTOR (SC) via Terminal 7 Wire 56.

The STARTER CONTACTOR (SC) energizes and its contacts close, battery output is delivered to the STARTER MOTOR (SM) via Wire 16.The STARTER MOTOR energizes and the engine cranks.

Also, while cranking, engine control circuit board action energizes Terminals 9, 10, and 11 which deliv- ers battery voltage to the Wire 14 circuit. This ener- gizes the FUEL PUMP (FP), FUEL SOLENOID (FS), HOURMETER (HM), and optional light or hourmeter in remote panel.

Wire 14 is also connected to RESISTOR (R2) and DIODE (D2). After passing through R2 and D2 reduced voltage is applied to Wire 4. The reduced voltage, approximately 3-5VDC, is sent to the ROTOR via The BRUSHES and SLIP RINGS. This voltage is used for Field Boost.

Also while cranking, engine control circuit board action energizes Terminal 12 which delivers battery voltage to Wire 85. "Refer to Circuit Condition-Fault Shutdown for operation".

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