Manual

58
042-288-B0-001, Rev. A
4.0 The Engine Control Module, continued
4.2 ECM Operating Mode Summary, continued
The following conditions cause immediate engine shutdown:
1. Manual engine stop switch is activated.
2. Software engine stop switch is received.
3. Any of the following engine alarms become active:
• Low oil
• Engine over-temperature
• Low fuel
• Over-speed
• Over-crank
• Over-voltage
4. Any of the following system alarms become active:
• Gas hazard
• Pad shear
• Water intrusion
• General APU failure
4.3 LED Indicators
The ECM uses fi ve LEDs to display alarms and system status.
The red Major alarm LED indicates failure of a critical component, or some other situation
(i.e. pad shear) where the system has gone off-line or system failure/shutdown is imminent.
The engine is shuts down immediately during major alarms. Most major alarms are latched
(will not self-clear) by the ECM. A site check by service personnel is required to repair the
fault and clear the system.
The red Minor alarm LED indicates a system fault which, although not indicative of imminent
system failure, requires service attention before the condition worsens. A site check by
service personnel is recommended.
The amber Notify LED represents status information that is not signifi cant enough to be
classifi ed as an alarm. At present, only two items fi t into this category: AC Line Status and
Engine Service Required.
The green COMM (Communications) LED illuminates for two seconds after each
communications session on the Alphabus. This is standard with Alphabus communications
systems.
The green SYS (System) LED indicates that the microprocessor has power and is operating
normally. This LED normally fl ashes once a second. When the ECM is in factory test mode,
the LED fl ashes twice a second.