Alpha Technologies AlphaGen PN-6x-T 7.5kW 48VDC - Installation and Operation Manual - Manual (Page 44)

44 745-020-B0-003, Rev. C
4.0 The Engine Control Module, continued
4.5 Alarm Classifi cations, continued
Minor Alarms:
Minor alarms indicate a system fault which, though not indicative of imminent system failure
or shutdown, requires service attention before the condition worsens. A site check by service
personnel is recommended.
• Control Fail (Latching – after fi ve activations): Indicates a control failure between the
ECM and the generator set. Typically this means the engine did not start or stop when
commanded to do so. The alarm is cleared when the Reset command is issued or the
manual stop switch is activated.
• Alternator Off (Non-latching): This alarm is active if the generator controller has
disabled the alternator output. A generator controller may disable the alternator output if
the output voltage cannot be held above some threshold.
• Self-test Fail (Latching): Activates when the most recent generator self-test fails. The
alarm is cleared when the Reset command is issued, the manual stop switch is activated
or another Self-Test command is issued.
• Low Ignition Battery: Indicates the generator’s ignition battery voltage has fallen below
11.5VDC. Alarm is cleared when battery voltage rises above 12VDC indicating battery
recovery has begun. Note that low ignition battery voltage does not trigger an alarm
during engine cranking.
• 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 enclosure doors is open. The alarm clears when the door is closed
(disabled).
• DC Bus Fault: Indicates the power system DC bus voltage, as measured at the ECM,
is less than the DC bus voltage (programmable - default = 49V). This alarm clears
automatically when the bus voltage exceeds 2V 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 fi ve consecutive “Low Fuel” alarms or fi ve consecutive “Control Fail”
alarms. This alarm is cleared by issuing a “Reset” command or when the “Manual Stop”
switch is activated.
• Output Circuit Breaker OFF or Disabled: No ECM indication. Verify circuit breaker
position visually.
Notifi cations:
Notifi cations represent important information not urgent enough to be considered an alarm.
There are currently two notifi cations.
• 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 routine maintenance of the engine/generator is due. This
alarm activates when the Service Countdown reaches 0. It is cleared by depressing the
service timer reset button for fi ve seconds (Refer to Section 7.0, System Maintenance, for
further information).