The unit has been
designed to be rugged, reliable, and include all the safety features
which I wish we had put into our previous versions.
RADIO CONTROL NOISE
The radio remote control devices we use to
perform the radio control functions uses digital encoding to
prevent random electrical noise or your neighbors similar unit
from interfering with proper operation. Despite this, most radio receivers
can be fooled and may provide an output when no valid signal is
being received. The Controller implements a time out feature which
disables the radio control inputs if no radio commands are received
for 5 minutes. This prevents radio noise from operating the motor
while you are out in the boat. The radio may be enabled again
without going to the controller by sending a special sequence of
commands from the transmitter hand unit. The timout feature does not
affect the manual inputs which are always functional even when the
radio control has been disabled.
Limit switch inputs are provided to
prevent the Controller from operating the motor when
activated. Two limit switch inputs are provided, one for each
direction (IN and OUT). When the IN limit switch input is activated
it prevents the motor from being activated in the IN direction. The
OUT limit input does the same thing for the OUT
direction. These inputs are intended to be wired to external sensors which
can prevent the dolly from being moved in the direction which may
cause equipment damage or personal injury . An example of one of
these conditions would be to prevent the dolly from coming off the
rails at either end.
When the boat is brought in for the day the controller
should be turned off to prevent any malfunction from activating the
motor. A home sensor is installed to detect when the boat is fully
inside the the boathouse. When this sensor is activated the
controller automatically turns its power off.
FAIL-SAFE SENSOR INPUT
This input is provided
to allow the connection of an external sensor to detect a
malfunction of the controller. This input is not processed by the
internal microprocessor and will turn the controller off when
activated, even if the controller is malfunctioning.
Electrically reversing motors must stop rotating before the
direction of the motor can be changed. If the controller is
requested to to reverse the motor direction before the motor
has stopped rotating the motor will continue in the original
direction. The reason for this is that the start winding is
disconnected by an internal centrifugal switch once the motor starts
to rotate. If the motor is re-energized before the centrifugal
switch reconnects the start winding its direction can not be
changed. The controller implements a time delay to allow the
motor to stop when switching directions. Due to the pull of the
dolly/boat the motor will take longer to stop when operating in the
OUT direction. Because of this the controller has a longer delay
when switching from OUT to IN.
Although the controller uses very reliable high current
relays which are rated for switching motor loads they are still
mechanical devices which can stick or fail. The controller monitors
the operation of the relays to insure they are operating properly.
If a failure is detected the controller will turn off to prevent
undesirable operation from causing damage or injury.
HEAVY DUTY COMPONENTS
and supply connectors are heavy duty reliable electrical
connectors which are properly rated for the voltage and current required.
The motor control relays are CSA and UL rated for one horsepower motor
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