Section 5

ENGINE DC CONTROL SYSTEM

CIRCUIT CONDITION- CRANKING:

When the START-STOP-SWITCH (SW1)or REMOTE PANEL START SWITCH is held at “START” position, Wire 17 from the Engine controller circuit board is con- nected to frame Ground. Circuit board action will then deliver battery voltage to a STARTER CONTACTOR RELAY (SCR) via wire 56, and to a automatic CHOKE SOLENOID (CS) via Wire 90.

When battery voltage energizes the STARTER CON- TACTOR RELAY (SCR), Its contacts close and battery output is delivered to the STARTER CONTACTOR (SC) via Wire 16. The STARTER CONTACTOR (SC) ener- gizes and its contacts close, battery output is delivered to the STARTER MOTOR (SM) via Wire 16.The STARTER MOTOR energizes and the engine cranks.

When the STARTER CONTACTOR RELAY (SCR) closes, Battery voltage is also delivered to the circuit board pin location J1-13 via Wire 16. This voltage is reduced and used for field boost and is outputted from pin location J1-9.

While cranking, the CHOKE SOLENOID (CS) is ener- gized cyclically by circuit board action (two seconds on, two seconds off).

Also while cranking, circuit board action energizes CIRCUIT BOARD TERMINAL J2 and delivers battery voltage to the Wire 14/14A circuit. This energizes the FUEL PUMP (FP) ,FUEL SOLENOID (FS) and CHOKE HEATER (CH) and optional light or hourmeter in remote panel.

Circuit board action holds open Wire 18A to common ground. The Magneto will induce a spark during cranking.

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Generac Power Systems 75, 55, 65 manual Circuit CONDITION- Cranking

65, 75, 55 specifications

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