Becker ACU6100 series Installation And Operation Manual page 46

3.9 Built in test
3.9.1 Power-up built in test (P-BIT)
Every time the system is powered, an internal self test procedure is started.
While the test is running, the LED above the "TEST" push button illuminates. The test lasts up to 4 se-
conds. After the test, the following results are shown:
No failure detected
q
Failure detected
q
If the internal test routine detected an failure (yellow LED is blinking), the operator has 2 possibilities:
By pressing the "TEST" button, the failure can be acknowledged. In case at a perma-
q
nent problem inside the system, it will be detected by the continous self test routine
and indicated again.
Switching into the slaved or emergency mode by using the "BACK-UP" switch
q
3.9.2 Continuous built in test (C-BIT)
During normal operation of the system, a permanent background test routine is continuously running. If
an error is detected, the "TEST" LED starts to flash. If it is not a fatal error, the operator can acknowled-
ge the failure by pressing the test button.
In case of notable degradation in unit or system performance, the operator can turn to emergency ope-
ration, either in "SLAVED" or "BACK-UP" mode.
3.9.3 Initiated built in test (I-BIT)
An initiated built in test can be activated on each ACU at any time by pressing the "TEST" button (ex-
cept during transmission mode).
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ACU6100
yellow LED is off; the system is in normal mode
yellow LED blinking
DV 64440.03/.04 Issue 1 Sept./2005