Alpha Technologies AlphaGen PN-6x-T 7.5kW 48VDC - Technical Manual - Manual (Page 59)

042-288-B0-001, Rev. A 59
4.0 The Engine Control Module, continued
4.4 Control Functions
The Run-Auto-Stop (RAS) switch controls the Auxiliary Power Unit (APU). Typically the RAS
switch is in the AUTO position so the ECM has control of the generator. When the RAS is
not in the AUTO position a minor alarm is displayed. The STOP position is used to stop or
prevent APU operation during maintenance. Placing the RAS switch in the STOP position
for three (3) seconds, then switching back to AUTO will clear any latched alarms and
start the generator (if the cause of the alarm has been corrected). The RUN position will
start and run the engine until the switch is released to AUTO. The engine may not shut down
immediately after the switch is returned to the AUTO position because shutdown criteria must
fi rst be met. Placing the RAS switch in the AUTO position from the STOP position will start
and run the APU for one minute, after a short delay.
The Service Reset switch resets the engine service timer and displays all active alarms.
The ECM’s programmable service interval defaults to 100 hours. When 100 hours of engine
runtime elapses, a Service Required notifi cation is sent and the notifi cation LED illuminates.
After the engine has been serviced, pressing and holding the service reset switch for
fi ve seconds resets the 100-hour service counter. All of the LEDs fl ash while the switch
is depressed. The LEDs then remain on solid until the switch is released. This provides
feedback to the technician, indicating the effective resetting of the engine service counter.
The Service Reset button also displays alarm information. To retrieve details about an active
alarm, press and release the Service Reset button. Active alarms (major and minor) are
indicated by the LED display (See Fig. 4-3). Press the button again to display the next active
alarm. Pressing the button when there are no more active alarms will reset the LEDs to their
normal state. Several quick fl ashes of all fi ve LEDs indicates the end of the alarm list. If the
Service Reset button is not depressed again after an alarm is indicated, the LEDs return to
their normal display after 30 seconds. Resetting alarms using status monitoring or the manual
stop switch also clears the alarm pattern indicated by the LEDs.
Major Alarm LED (Red)
Minor Alarm LED (Red)
Notify LED (Amber)
COMM LED (Green)
SYS LED (Green)
RAS Switch
Service Reset Switch
Fig. 4-3, LED Indicators and Control Functions
Depressing the Service Reset button for fi ve seconds causes the service timer to clear, possibly disrupting the
preventive maintenance schedule.
NOTE: