Seiwa SW AP03 User Manual
Page 36
Note that the tables are for a helm swing between 20 degree limits and are not the
lock-to-lock ratings. The response times will vary according to the stiffness of the
steering. The drive motor and chain linkage must be mounted in a dry area of the hull.
Table 3.1 Driven sprocket sizes for a 12V system.
Hull length
Up to 11 m
11 to 13 m
Above 13 m
Response time
-20 to +20 deg
8 sec
10 sec
12 sec
Shaft
revolutions for
-20 to +20 deg
Driven Sprocket Size (teeth)
1
48
60
80
2
25
30
38
3
20
25
25
4
13
15
20
5
13
13
15
Table 3.2. Driven sprocket sizes for a 24V system.
Hull length
Up to 11 m
11 to 13 m
Above 13 m
Response time
-20 to +20 deg
8 sec
10 sec
12 sec
Shaft
revolutions for
-20 to +20 deg
Driven Sprocket Size (teeth)
1
70
85
105
2
38
38
48
3
25
30
38
4
15
20
25
5
15
15
20
Mount the drive unit so that its shaft is parallel to the driven shaft and the two
sprockets are in line. After fitting the chain and adjusting its tension, there should be
12mm of deflection for each metre length of chain. (1/2" for each 3 ft.) Lay the four-
core motor/clutch cable back to the Junction Box and terminate it according to Fig 3.11.
Note that the CLUTCH NEG terminal is internally connected to the negative power
supply terminal.
Figure 3.11. Connections to a mechanical steering drive motor.
34
CLUTCH +
MOTOR +
GREEN
BROWN
MOTOR
MOTOR -
CLUTCH -
CABLE
BLUE
BLACK