Seiwa SW AP01 - Manual (Page 26)

HELM
DAMPING
The Helm Damping control compensates for inertia or
overshoot in the steering drive, which may be present in most
hydraulic or electrical systems. To check the suitability of the
preset value of 2, turn the helm manually to about 20 deg. rudder
angle and press PILOT to centre the helm. Observe the rudder
movement. If the rudder stops short and then "inches" into the
centre position, reduce the damping factor. If it overshoots and
"inches" back, increase the damping factor.
The deadband acts as a filter which prevents the steering drive
from pulsing on and off in response to very small error signals. If it
is set too high, the steering will be slow to respond to small
corrections. The best setting is one just above the value which
produces continuous pulsing of the steering gear.
AUTOTRIM The autotrim continuously adjusts the helm centre by averaging the
course errors over time. It may be switched off (0) or on (1).
STEER DRIVE This may be used to run the steering drive continuously for bleeding
purposes. Note that if the rudder transducer is not coupled, there is
a risk of driving the steering gear against the stops. Press the left
or right arrows to start and stop the drive.
ALARM GROUP
As a safety feature, a HELM ALERT alarm is activated at regular
intervals when the system is in the PILOT mode. The time interval
may be set to 5, 10 or 15 minutes or the alert may be switched off.
STALL ALARM ON The Drive Stall alarm is activated after a Cold Start, but this
option may be used to disable it, if necessary. We
recommend that it not be disabled for normal use. 25
OTHER FUNCTIONS
25