Seiwa SW AP01 - Manual (Page 46)

If a fluxgate is being used, the heading signals from the fluxgate are above or below
the preset limits. The fault must last more than 12 seconds before this alarm becomes
active.
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This prevents a false alarm from being triggered, for example by the fields in a rolling
steel vessel. If the system was in PILOT, it remains there with the alarm sounding. The
alarm can only be cleared if the fault is corrected.
Causes.
If the error comes up on all headings and cannot be cancelled, the possible causes are
a defective connection or cable to the fluxgate, a fault in the compass electronics in the
Junction Box, or a defective fluxgate unit. If the message comes up only on some
headings, the probable cause is the magnetic environment of the compass - either an
excessive horizontal field or vertical field due to local magnetic material. In this case,
consult the guidelines in Chap 3.
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 wiring. 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.
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 which were 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.
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