National Crane 600H, Руководство по обслуживанию

Страница: 64 / 232

ELECTRIC SYSTEM 600H
3-10
08-19-2022 Control # 092-13
b. “M” (Start) circuit energized to power start relay at
truck engine.
c. “N” (Throttle Advance) circuit energized to power
the throttle advance relay at truck engine (if
equipped).
4. Function Switch (Turn, Telescope, Hoist, Boom, etc.)
thrown (Momentary).
a. Energizes the selected circuit to power one of the
solenoid valve coils at the crane frame.
b. At the same time, energizes “N” (throttle advance)
circuit to power the throttle advance relay at the
truck engine (if equipped). Throttle stays activated
for five seconds after function switch is deactivated.
5. Trigger
a. Attached directly to potentiometer shaft.
b. Controls the speed that a crane function will
operate. The more it is moved, the faster the
function will operate.
Emergency Stop Function
This unit is equipped with an Emergency Stop. The
transmitter has a momentary push button switch near the
antenna. When initially using the radio remote control
system, turn the receiver power on first. This allows power to
the microprocessor and awaits for a special code from the
transmitter to activate a relay to make power available to the
output driver circuit.
When the transmitter is turned on, it will transmit a special
code for 10 seconds to instruct the receiver to initialize. This
will happen only if the transmitter is Not transmitting a
function such as switch being activated. During this initial 10
seconds a function may be activated once the receiver has
been Initialized. The initialization is instantaneous so you will
not have any delay in operation. If the transmitter is “out of
range” or a function is activated when the transmitter is
turned on, the receiver will not be initialized. Once the
receiver has been initialized, the unit will be allowed to
operate. Should an emergency situation occur, the receiver
may be “shut down” by pressing the Emergency Stop Switch
on the transmitter. This must be pressed while transmitter
power is in the ON position. This special code will be
transmitted for a period of 10 seconds.
When the receiver receives this special code, the power to
the output driver circuit will be de-activated. To resume
operation, the transmitter must again send the special code
to re-activate the receiver. To achieve this, turn transmitter
power off and back on.
The transmitter will again go through its routine to initialize
the receiver.
Please instruct your operators how to use
this “Emergency Stop” and insist that they operate this
feature to become familiar with the characteristics
involved.
Frequently Asked Questions
Question Answer
What kind of range can be expected? Advertised at 400 feet. Very likely to be much greater. The environ-
ment, terrain, antenna placement, and transmitter’s position can play
an important role in achieving maximum range.
What method of transmission is being utilized? The radio uses Radio Frequency (RF) at 49 Megahertz (49 MHz).
Why 49 MHz? The Federal Communications Commission (FCC) dictates the fre-
quency spectrum for the purpose of radio control devices. There are
several bands that can be used. A lower band was chosen to reduce
the “line-of-sight” characteristic. Lower frequencies tend to follow the
curvature of the Earth, which will allow control in areas that are not
“line-of-sight” such as ravines, embankments, cliffs, and even build-
ings.
Do you use amplitude modulation (AM) or fre-
quency modulation (FM)? FM is utilized. FM is a must in electrically noisy environments. These
environments include areas with welders, power lines, industrial
machinery, etc. A good analogy is a standard automobile radio. In the
above mentioned areas, the radio will have static on AM stations. Your
FM stations assure definite clarity and a common extended range.
REFERENCE ONLY