9-3
Major Functions of Genset Controller
Initialization:
Control initialization consists of
checking memory (RAM, ROM, EEPROM) and
genset configuration.
Fuel Prime:
Press and hold the control switch at
STOP (Prime)
for more than 2 seconds to cause
fuel pump E5 to prime the fuel system.
Startup:
Press and hold the control switch at
START (Preheat)
until the genset starts. The con-
troller:
1. Enables the
amber
status lamp to blink rapidly.
2. Enables some fault detection.
3. Energizes fuel lift pump E5.
4. Energizes the glow plugs during pre-heat and
cranking. The duration of pre-heat prior to
cranking is engine temperature dependent, but
does not exceed 15 seconds.
5. Enables cranking. The maximum allowed dura-
tion of cranking is engine temperature depen-
dent and varies between 20 and 60 seconds.
6. Enables field flash if no frequency pulses are
present (F1-F2).
7. Energizes governor actuator A12 (full rack).
8. Disconnects the starter (B1) at 800 rpm.
9. When operating speed is reached:
A. Enables output voltage.
B. Turns off field flash.
C. Turns off
amber
status lamp.
D. Turns on
green
run lamp.
E. Enables Switched B+ (J7).
F. Enables complete fault detection.
Stop:
Touch the control switch to
STOP (Prime)
.
The controller:
1. Disables output voltage.
2. Deenergizes the fuel lift pump and governor ac-
tuator.
3. Turns off the
green
run lamp.
4. Writes session data (number of cranks, min-
utes of operation, last fault, etc.) to non-volatile
memory (NVM).
5. Removes processor power when idle 5 min-
utes.
Note: Stop takes precedence over Start if both pres-
ent due to a faulty switch or other cause.
Voltage Control:
The controller maintains nominal
AC output voltage by varying field current as load
varies. In response to transient loads it lowers the
voltage setpoint to allow engine recovery. Field
power is supplied by the quadrature windings
(Q1-Q2).
To Adjust Voltage:
See Page 10-2.
Fuel Control:
The controller positions the fuel rack
to maintain nominal frequency as load varies by
sending a pulse-width-modulated square-wave sig-
nal (PWM) to governor actuator A12 (p. 9-7). It de-
termines frequency by sensing the frequency of the
quadrature winding output. When the actuator is not
energized, its spring-loaded plunger holds the fuel
rack in the no-fuel position.
To Change Frequency:
See Page 10-1.
Fault Monitoring, Shutdown and Diagnostics:
See
Troubleshooting
(Page 11-1).
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Summary of Contents for MDKBH Series
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