5-2
Major Functions of Controller A1
Figure 5-2 is a block diagram of controller functions.
Initialization: Control initialization consists of
checking memory (RAM, ROM, EEPROM) and
genset configuration.
Fuel Prime (Gasoline Gensets): Press and hold
the stop switch for more than 3 seconds to cause the
fuel pump to prime the fuel system.
Startup: Press and hold the start switch until the
genset starts. The controller:
1. Enables cranking.
2. Energizes the fuel pump E2 (gasoline models
only).
3. Depending on model:
A. Enables fuel injection
B. Energizes the gasoline carburetor fuel cut-
off solenoid E3 and choke heater
C. Energizes LPG fuel cutoff solenoid E3.
4. Flashes the field (F1-F2).
5. Flashes the status indicator light during crank-
ing.
6. Disconnects the starter when engine speed is
greater than 1300 rpm and turns the status indi-
cator light on solid.
7. Turns on Switched B+ (remote pin J8-F).
8. Enables output voltage two seconds after oper-
ating speed is reached.
9. Turns off field flash.
Stop: Press the stop switch momentarily. The con-
troller:
1. Disables output voltage.
2. Deenergizes the fuel pump and fuel cutoff sole-
noid or fuel injectors.
3. Enables ignition kill.
4. Turns off the status indicator light.
5. Writes session data (number of cranks, min-
utes of operation, last fault, etc.) to non-volatile
memory (NVM).
6. Removes processor power when idle 5 min-
utes (15 minutes, HGJAA & HGJAD).
Note: Stop takes precedence over Start if both pres-
ent due to a faulty switch or other cause.
Fuel Control: See GASOLINE FUEL SYSTEM—
SERIES HGJAA & HGJAD, Page 8-1.
Voltage Control: The controller maintains nominal
AC output voltage during steady state operation by
varying field current as load varies. In response to
transient loads it lowers the voltage setpoint to allow
engine recovery. Field power (DC) is supplied by the
quadrature windings (AC) through the controller.
For output voltage specifications see Table 8-1
(Page 8-1) for Series HGJAA & HGJAD and
Table 8-3 (Page 8-19) for all other models.
Fault Monitoring, Shutdown and Diagnostics:
See Section 11. Troubleshooting.
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