Raymarine Autohelm ST6000, Руководство по обслуживанию

Страница: 13 / 214

Autohelm
Autohelm Autohelm
Autohelm
SeaTalk Service Manual 9
Unsatisfactory Steering Performance
If the 5T7000 has been installed and set up
in accordance with the instructions in the
Installation Manual it will provide excellent
steering performance over a wide range of
conditions.
If performance drops but the autopilot is still
working correctly, the following simple
checks should find the fault:-
•
Has a magnetic influence been
introduced near the fluxgate compass? i.e.
anchor, chain, radio equipment,
loudspeaker, tools, generator etc. Check
that the autopilot compass heading still
corresponds with the steering compass.
•
Are all fuses intact, circuit breakers
engaged?
•
Are all screw connections tight and free
of corrosion.
•
If the autopilot fails to hold course check
the Rudder Gain level. Has it been changed
from the initial sea trials level (check in
Installation Manual)?
•
If the vessel wanders check that the
Rudder Reference Transducer linkage is
secure with no free play.
Hydraulic Drive Units only:-
•
Check that all unions are tight and bleed
system to remove air.
Safety
Passage making under autopilot is a
very pleasant experience which can lead
to the temptation of relaxing permanent
watch. This must always be avoided no
matter how clear the sea may appear to
be.
It is the responsibility of the skipper to
ensure the safety of his vessel at all
times by careful navigation and that all
crew members are familiar with the
procedures required to engage and
disengage the autopilot.
When searoom is restricted, a crew
member must be close to a control unit
at all times if under Autopilot control.
On Power craft permanent watch should
be maintained at the steering station
when at speed with the Autopilot
engaged.
Failure to Disengage
The mechanical drive actuators of the
ST7000 are designed to ‘Fail Safe’ — When
power is disconnected the drive unit will
disengage leaving the steering system free
for manual control.
When Standby is selected the actuator will
Disengage leaving the steering free.
It is remotely possible that a fault could
develop which could cause the actuator to
remain engaged even when Standby is
selected. If this happens:-
•
DISCONNECT THE MAIN CIRCUIT
BREAKER TO THE AUTOPILOT — THE
STEERING WILL IMMEDIATELY BE FREE.
or
•
IN AN EMERGENCY THE ACTUATOR
CLUTCH CAN NORMALLY BE
OVERRIDDEN BY TURNING THE
STEERING WHEEL HARD.
It is emphasised that this fault is extremely
unlikely and can be immediately corrected
as described.
If preferred a separate Override switch can
be fitted close to the steering position which
will break the actuator clutch drive for
Emergency Use.