Alpha Technologies AlphaGen 5.0kW Auxiliary Power Unit - Manual (Page 37)

3. Maintenance
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031-132-B0-001 Rev. A TM ©2000
3.2 Scheduled Maintenance, continued
3.2.3 ECM Self-Test Features
Generator testing can be initiated in four ways:
1. The ECM can be programmed to periodically run an automatic test
(Default OFF). Refer to Section 3.2.3 for additional information.
2. A Self-Test can be commanded via status communications.
3. Momentary activation of the Engine Run command will cause the
ECM to effectively run a test. Note that this method is the least
desirable because the Self-Test Fail alarm will not be set if an alarm
condition arises.
4. A one-minute automatic test is performed when the manual control
switch is returned to Auto from Stop.
Generator testing consists of starting and running the generator for a
programmable period of time (the default test duration is 10 minutes). The
ECM monitors all engine-related signals and will declare a self-test as failed if
any of the following alarms activate during the test:
• Low Oil Pressure • Alternator Overvoltage
• Engine Over-temperature • ECM Control Failure
• Engine Over-speed • Alternator Not On
• Engine Over-crank • Low Ignition Battery
• Low Fuel • Low DC Bus Voltage
The ECM will not start a self-test if the engine is disabled, the stop switch is
asserted, or the engine is already running.