NORTHROP GRUMMAN NAVIGAT X MK 1, Operation, Installation And Service Manual

Page: 39 / 110

NAVIGAT X MK 1 056343/C
Error messages 3-3
3.3 Error messages
The following table lists the error messages which may appear on the
display and in the error list when a system alarm is active.
Table 3-1:
error messages
Message on
Display Message in
Error List Cause Corrective
Action
GYRO N
FAILURE
(N = own gyro
ID)
FAILURE GYRO
N
The system can-
not provide
gyro heading.
Possible causes
are defects of
the gyrosphere,
the follow-up
system or the
shaft encoder,
or a defect of
the hard- or
software on the
master PCB. If failed gyro is
active hdg.
source, activate
another source,
if available.
Restart the
gyrocompass
system. If the
error persists,
call an author-
ized Sperry
Marine service
station.
GYRO N
FAILURE
(N = ext. gyro ID)
FAILURE GYRO
N
Loss of data
from ext. gyro
heading source. If failed gyro is
active hdg.
source, activate
another source,
if available.
Check ext. gyro
heading source
and interface.
MAGN.
COMPASS
ERROR FAILURE
MAGN. Loss of mag-
netic heading
data from ext.
source. Check mag-
netic heading
source and
interface.
MAGN.VAR.
INVALID MAGN.VAR.
INVALID Loss of magn.
variation data
(if automatic
input active) Check magnetic
variation source
and interface.
SPEED
ERROR FAILURE SPEED Loss of speed
data from ext.
source.
Check speed
data source and
interface.
SPEED INVALID SPEED INVALID Actual speed
outside of valid
speed range;
invalid speed
will not be used
for North speed
error correction Check speed
data source and
interface.
Check current
speed filter
parameters in
Service Setup.
If required,
increase valid
speed range
and/or increase
filter time con-
stant.