Alpha Technologies AlphaGen 5.0kW Auxiliary Power Unit - Manual (Page 38)

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, continued
If AC line should fail during a test, the test will terminate normally but the
engine will continue to run until line returns. If the test fails because the DC
Bus alarm activates, the test will terminate, the self-test fail alarm will activate
but the generator will continue to run until the DC Bus alarm clears.
The Self-Test Fail alarm may be cleared via a reset command or by
successfully running a subsequent test.
The programmable, internal ECM variables listed below control automatic
self-tests.
Auto-Test Interval
This feature represents the number of days between automatic tests.
Programming this variable to 0 disables the automatic test feature (0 is
the default value).
Auto-Test Countdown
This countdown timer is monitored by the ECM to determine when the
next automatic test should be initiated. Although this timer is normally
used as a status indicator, it can be used to set the start time for the next
autotest. For example, if the user wants to start the automatic test
sequence at 12:30pm and it is presently 10:15am, they can wait until 10:30
and program Auto-Test Countdown to 2 hours. Subsequent tests will begin
at nearly the same time of day so long as the ECM doesn't lose power in the
interim. The ECM sets Auto-Test Countdown whenever the Auto-Test
Interval is changed. Thus, if the Auto-Test Interval is programmed to 10
days, the ECM will set Auto-Test Countdown to 240 hours.