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SPEED
INVALID
SPEED
INVALID
Actual speed out-
side of valid speed
range (invalid speed
will not be used for
North speed error
correction).
When triggered
while vessel is not
moving, the set
minimum speed
(default) value is
increased by fast
currents of fairway
water
1. Check speed data
source and inter-
face.
2. Check current
speed filter
parameters in
Service Setup,
‘see “SPEED FIL-
TER” on page 8-
18
3. If required,
increase valid
speed range and/
or increase filter
time constant
POSITION
ERROR
FAILURE
POS.
Loss of position
data from ext.
source.
Check position data
source and interface.
HEADING
DIFF.
ALARM
HEAD. DIFF
ALARM
The monitored
heading sources dif-
fer by more than the
set alarm threshold.
Check heading
sources to determine
cause of the differ-
ence.
MAX ROT
EXCEEDED
MAX ROT
EXCEEDED
Max. Rate of Turn
alarm threshold
exceeded.
Alarm reminds the
operator not to
exceed preset
threshold during
turns.
Prevent vessel from
turning too fast or
increase threshold if
unwanted alarms are
given.
FAILURE
AC
SUPPLY
FAILURE
AC SUPPLY
Loss of power from
main supply.
Check AC main
power supply.
FAILURE
DC
SUPPLY
FAILURE
DC SUPPLY
Loss of power from
backup supply.
Check DC backup
power supply.
RECOM-
MENDED
ANNUAL
MAINTE-
NANCE
DUE!
(see man-
ual)
OPERA-
TION TIME
Alarm given during
operation if opera-
tion hours counter
reached maximum
level (18 months)
and at each power-
up if more than 18
months have
passed since the
last gyrosphere
maintenance.
Acknowledge alarm.
System will power-
up normally.
To ensure trouble
free operation, it is
highly recom-
mended to have
maintenance carried
out every 18 months.
NT COM
FAULT
NT COM
FAULT
Loss of input data
from compass mon-
itor NAVITWIN
Check NAVITWIN
and interface
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Содержание 4914-CA
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