Alpha Technologies ECM - Manual (Page 42)

42
TM 744-862-C0-003 Rev.C
Engine Control Module (ECM)
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 auto-test. 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.
Auto-Test Duration
The length of each Auto-test is measured in minutes. The default test
duration is 10 minutes. The test duration may be set between 10 and
120 minutes.
Manually enabling the Autotest feature
Switch SW5-8 is used to enable the autotest feature with a 14-day test
interval. The first autotest will begin 14 days from the time the ECM is
powered up with the configuration switch changed from 0 to 1 (OFF to
ON). To disable the autotest sequence, place switch SW5-8 in the OFF
position and restart the ECM. It is important to understand that upon
power up, the ECM looks for a change in the switch position before it
changes the test control parameters. (Please refer to Fig. 4-2)
5.1 Self-Test, continued