Owners manual

Introduction:
CT2-40A Motor Controllers are designed to connect a ComNav Autopilot to a steering system
using a permanent magnet, shunt field, or compound reversing D.C. Motor.
CT2-40A Motor Controllers feature dynamic braking, current limiting and thermal protection of the
MOSFET driving transistors while allowing full power acceleration and drive when needed. CT2
Motor Controllers can be used with
12, 24 and 32 VDC battery systems.
CT2 Motor Controllers also feature automatic field control for use with Shunt Field and Compound
Reversing D.C. Motors. The field of the motor is energised any time the Autopilot is turned on.
Installation:
WARNING
To ensure that the CT2 Motor Controller case will stay watertight, it is very important
that you use round cables in all three watertight cable fittings. The two large cable
fittings will require a cable with an outer diameter ranging from 5/32"(4.0mm) to
13/32"(10.0mm). The smaller cable fitting will require a cable with an outer diameter
ran
g
in
g
from 3/32"
(
2.5mm
)
to 1/4"
(
6.5mm
)
.
For mounting, a #10 size hole is provided in each foot of the 2T Motor Controller box.
The Autopilot and the CT2 Motor Controller must be run from the same source of power,
although they do not need to be powered from the same breaker. In fact, for installations that use
two drive units, it is preferable to power the Autopilot and each CT2 Motor Controller from a
separate breaker. This way either or both drive units may be selected to operate independently
from the Autopilot.
To provide power to the CT2 Motor Controller, use #12 AWG wire if the combined run from the
breaker to the box and from the box to the motor, is 25 feet or less. If the combined run is greater
than 25 feet use #10 AWG wire. Run the power lead from a 50 Amp breaker to the CT2 Motor
Controller.
If the Autopilot is powered from the same breaker as the CT2 Motor Controller, run a
separate wire from the breaker to the Autopilot as shown in the diagram. DO NOT run the power
lead to the Autopilot from the CT2 Motor Controller. Before providing power to the Autopilot, refer
to the Autopilot Installation and Operation Manual for the appropriate wire gauge.
21/09/2007 Page 1 of 10 29010024V3.3(2T Drive Box).doc