Alpha Technologies ECM - Manual (Page 28)

28
TM 744-862-C0-003 Rev.C
Engine Control Module (ECM)
3.1 Alarms Classifications, continued
Auto Mode Disabled
Indicates the position of the ECM control select switch. When the
Run-Auto-Stop (RAS) switch is in a manual (STOP or RUN) position, the
ECM has no control over engine operation and therefore raises an alarm.
This is a hardware ‘lockout’ input and cannot be changed via status
monitoring.
Tamper
One of the doors on enclosure is open. The alarm clears when the door
is closed.
DC Bus Fault
Indicates that the power system DC bus voltage, as measured at the
ECM, is less than 1.95 volts per cell. This alarm clears automatically
when the bus voltage exceeds 2 volts above nominal (i.e., 50VDC in a
48V system).
Engine Disabled
Command to disable normal operation of the generator set. When set
to DISABLE the engine is shutdown and will remain so under all
conditions. A Minor Alarm indicator will be active if this switch is set to
DISABLE.
The engine is disabled by software after five consecutive "Low Fuel"
alarms or five consecutive "Control Fail" alarms. This alarm is cleared
by issuing a "Reset" command or when the "Manual Stop" switch is
activated.
3.2 Notifications
Additionally, the ECM will report the following "Notification" information.
Line Failure
The ECM’s determination of the state of AC line voltage. Loss of AC
utility input is one of the criteria for starting the generator.
Service Required
Indicates that routine maintenance of the engine - generator is overdue.
This alarm activates when Service Countdown reaches 0. It is cleared
by depressing the service timer reset button for five seconds. (Refer to
Section 5.2 "System Maintenance" for further information) .