TMQ Bosun-AP9, Operation And Installation Manual

Page: 35 / 63

TMQ Bosun - AP9 Rev1 (935) Page 35 16/06/2003
Due to wide variation of mechanical steering systems and the turning speed
of vessels, this ratio has proved the most effective in regard to helm speed
and the required torque. If steering problems are encountered with the
TMQ mechanical units, different sprockets can be fitted on the motor drive
shaft; the variations normally available from the factory are 10 or 24 tooth.
Position
The motor should be mounted in a
dry position on a flat base and fasteners
with sufficient strength to withstand in excess of 150kg pull. The output
shaft should always be parallel with the shaft to be driven although the
motor can hang down or be mounted on the side.
When a sprocket is fitted on the back of a hydraulic helm pump, please
ensure that the helm pump does not twist under full load.
Wiring
Connect the motor unit to the [MOT] and [MOT] terminal strip locations.
If a clutch is required, connect this to the [CLU+] and [CLU-] terminal
strip locations. The maximum voltage drop allowed in the motor cable on
full load of 10 amps is 0.5 volts. This must be considered when selecting
the extension cable. If the motor runs in the wrong direction when the
autopilot is turned on, switch off and reverse the MOT and MOT
connections.
Warning
Time taken for rudder to travel lock to lock should not be less than 12
seconds. This will occur if steering shaft total turns are less than 2. In this
type of installation a large sprocket will be required on the steering shaft.
Refer to supplier for the correct sprocket size.