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L1 Controller Error Messages
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L1 Controller Error Messages
Table 7-2 lists error messages that the L1 controller generates and displays on the L1 display. This
display is located on the front of the IRU.
Note: In Table 7-2, a voltage warning occurs when a supplied level of voltage is below or above
the nominal (normal) voltage by 10 percent. A voltage fault occurs when a supplied level is below
or above the nominal voltage by 20 percent.
Table 7-2 L1 Controller Messages
L1 System Controller Message Message Meaning and Action Needed
Internal voltage messages:
ATTN: <power VRM description> high fault limit
reached @ x.xxV
30-second power-off sequence for the IRU.
ATTN: <power VRM description> low fault limit
reached @ x.xxV
30-second power-off sequence for the IRU.
ATTN: <power VRM description> high warning
limit reached @ x.xxV
A higher than nominal voltage condition is detected.
ATTN: <power VRM description> low warning
limit reached @ x.xxV
A lower than nominal voltage condition is detected.
ATTN: <power VRM description> level stabilized
@ x.xxV
A monitored voltage level has returned to within
acceptable limits.
Fan messages:
ATTN: FAN <fan description> fault limit reached @
xx RPM
A fan has reached its maximum RPM level. The
ambient temperature may be too high. Check to see
if a fan has failed.
ATTN: FAN <fan description> warning limit
reached @ xx RPM
A fan has increased its RPM level. Check the
ambient temperature. Check to see if the fan
stabilizes.
ATTN: FAN <fan description> stabilized @ xx
RPM
An increased fan RPM level has returned to normal.