Seiwa SW AP03 - Manual (Page 44)

DRIVE OVERLOAD
The system is in PILOT or one of the power steer modes and the motor drive current has
exceeded 20A for 1 second. The response to a drive short-circuit is immediate.
The system is forced into STANDBY and the message can only be cleared by pressing the
STANDBY key after the overcurrent condition is removed.
Causes.
The fault can occur if the mechanical drive or hydraulic pump motor has stalled or jammed.
Otherwise, look for a short-circuit in the drive-motor w iring. The fault can also indicate
damage to the vessel's steering gear.
DRIVE STALLED
The drive is on, but the helm has not moved over a 2.5 second period. The causes for this
can be similar to Drive Overload, but it can also be caused by a linkage failure at the rudder
transducer.
HELM ALERT
This is only a warning. If the alarm is selected, a timer is started in the system when in
autopilot, w hich brings up this message and an alarm tone every 5, 10 or 15 minutes. The
condition does no affect autopilot operation and is cancelled by the PILOT or STANDBY
keys.
OFF COURSE
The system is in autopilot and the vessel has been more than 8 deg. off course for 30
seconds. This alarm does not affect the normal operation of the pilot. It cancels itself when
the vessel returns to course or may be reset by the PILOT key or switching the system out of
PILOT.
RUDDER FAULT
The rudder transducer output is above or below the allowed range. This alarm forces the
system into STANDBY and may only be cancelled by pressing the STANDBY key after the
condition has been removed.
Causes.
This alarm comes up if the rudder angle exceeds the limits w hich w ere set during the
System Setup operation. If this has not occurred, the causes are probably in the rudder
transducer cable, connections, mechanical linkage or in the transducer itself.
Conditions w hich can cause the alarm to appear are if the transducer is off-centre by more
than 10 deg. or the autopilot rudder limit has been set beyond the mechanical limit.
4.3 OTHER FAULTS
The Junction Boxes contain over-voltage protection circuits. If there are large voltage spikes
on the power supply, the system may shut down and re-start without an error message
appearing. If this happens frequently, consult your dealer about measures to filter the
supply.
If the system will not switch on, check the main fuse and second fuse, if fitted. Using a
voltmeter, check that the correct voltage is applied to the two power terminals and that the
polarity is not reversed. A voltage of about 6V should also appear on the blue Controller lead
when the system is off.
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