Before using your MC800C Ver.2, please read
this manual thoroughly and use the MC800C
Ver.2 properly and safely. After reading this
manual, store it in a safe place.
• No part of this manual may be reproduced in any form
without prior permission.
• The contents of this manual are subject to change without
prior notice.
• This manual has been carefully written. Please write to
Futaba if you feel that any corrections or clarifications
should be made.
Thank you for purchasing an MC800C Ver.2. The MC800C Ver.2 is a high-frequency drive
FET speed control developed for model electric cars. It is compact and light weight
competition speed control, and uses a simple digital setting system.
MC800C Ver.2
I
NSTRUCTION
M
ANUAL
Applicable motors
(Number of turns is criteria.)
Use the MC800C Ver.2 with a motor with 5 turns or
more.
*If a motor with a number of turns smaller than the above
is used, the heat protector and overcurrent protection
circuit may operate. The number of turns of the motor is
a criteria only. Depending on the running conditions, the
protection circuit may operate even if the condition
above is satisfied.
Power supply
Nicd, NiMH battery 4~7 cells
(4.8~8.4V)
DESCRIPTION OF FEATURES
• SMD MOSFETs with smallest internal resistance for minimal losses and
maximum power
• Digital variable modes “Power Control 2”, “Hyper Brake” and “Neutral Brake”
MC800C Ver.2 features three different modes which enable you to adjust motor power and
the driving “feel” to match your special requirements precisely.
Power Control 2 is a revolutionary digital motor management system, which enables you to
set the rate of acceleration to meet your specific preference. This system replaces simple
technologies such as current limiting and variable frequencies.
Hyper brake allows you to set a certain level of “hand-brake effect” in an emergency, i.e. you
can vary the minimum brake effect when you apply the brake.
Neutral brake allows you to set a slight braking action which is applied in the neutral range.
This enables you to hold the throttle on longer when entering a turn. Your car also has greater
front axle grip with this setting.
• External solder points with 12 AWG silicone flex wire
• Start Acceleration function
The start of a race is often crucial to the result. You can exploit the Start Acceleration system
to give you the crucial advantage at start time, as the system shortens the speed control’s
response time at this critical moment, with the result that you have more acceleration
available.
• 4-cell operation possible without receiver battery
Blue-negative (-M) motor
Black-negative (-B) battery
Receiver connector
Connects to the receiver throttle
channel.
MC800C Ver.2
Power switch
MODE LED
SET LED
Red-positive (+B) battery
Red-positive (+M) motor
MODE
Pushbutton
switch
SET
Pushbutton
switch
CONNECTION
Accessories:
• Miniature screwdriver
(Use to press the pushbutton switch.)
• Schottky diode (for motor)
• Capacitors (for motor)
• Double sided tape
• Others
Install the receiver and receiver antenna
away from the amp, motor cord, power
cord, Nicd battery, and other parts that
carry a high current.
Metal and carbon chassis and other
conductive parts transfer switching
noise. When mounting the receiver to
such a chassis, use thick double-sided
tape to mount the receiver as far away
from the chassis as possible.
Always install a motor noise suppresser
capacitor. Also, do not forget to service
the brushes, and other parts.
If noise causes the receiver to operate
erroneously, control may be lost and an
extremely dangerous situation may occur.
Insert the connectors firmly.
If vibrations while running cause the
connectors to work loose, control may be lost
and an extremely dangerous situation may
occur.
Do not wrap your MC800C Ver.2 in foil.
It is important to provide a free flow of
cooling air over it.
MOUNTING PRECAUTIONS
Never reverse the battery polarity.
Reverse connection will immediately destroy
the amp.
Mount the MC800C Ver.2 so that conductive
parts do not directly touch the solder parts
of the input/output cord.
A short circuit may occur.
Do not remove the case of MC800C Ver.2.
The MC800C Ver.2 may not be repairable.
OPERATING PRECAUTIONS
INSTALLATION TIPS
•Mount the speed control in the model using the double-sided foam tape supplied.
•Provide plenty of cooling openings in the bodywork; this increases the performance and
extends the life of all electronic components.
•Install the speed control in a location where it is protected from crash damage.
•The speed control should be installed in such a way that you have easy access to all
connectors and the set-up button.
•For extreme applications, use a special heat-sink sold separately. Note: not strictly essential.
Naturally, MC800C Ver.2 also works perfectly without the heat-sink.
Important:
•Ensure that there is an adequate distance (approx. 3 cm) between the speed control and
power cables and the receiver or receiver antenna. Avoid direct contact between all power
system components and the receiver or antenna, as this can cause interference. If you
encounter interference problems, re-position the components in the model.
•The antenna should be run vertically up and away from the receiver. Avoid contact with any
parts made of carbon fibre or metal. See also the instructions supplied with your radio
control system.
INSTALLATION
•Solder the suppressor capacitors and the Schottky diode to the motor.
Motors with no suppressor capacitors, or
inadequate suppression, may cause the
MC800C Ver.2 to malfunction. Always solder the
capacitors supplied to your motor.
The schottky diode improves the efficiency of
the speed control / motor combination and
provides extra protection to the brake FETs. The
white ring must always face the positive side.
•Remove the motor pinion, or ensure in some other way that the wheels of the model
can rotate freely.
•Install the MC800C Ver.2 in the model.
•Connect the MC800C Ver.2 to the receiver (throttle channel).
•Connect the MC800C Ver.2 to the motor: red wire to positive (+), blue wire to
negative (-).
•Check all the wiring and connections before you connect the MC800C Ver.2 to a
drive battery.
Caution: incorrect polarity will wreck your MC800C Ver.2.
The MC800C Ver.2 is now ready to be set-up (see back page).
[MC800C Ver.2 Technical Data]
• Operating system: Forward and brake
• Power requirement: Nicd, NiMH battery 4~7 cells
(4.8~8.4V)
• PWM frequency: 3.1kHz (Especially Power
Control level 4 is performed by load adaptive.)
• Setting: One-touch input by pushbutton switch.
• Current capacity (Momentary load): 235A (FET
rating)
(Specifications are subject to change without prior notice.)
• Case size: 28.3x25.4x14.4mm
(excluding protruding parts)
• Silicon cord gauge size: AWG12 equivalent
• Weight: 17.5g
(excluding connector, cords and switch)
• BEC voltage: 5.8V
(excluding at 4 cells)
1M23N14302
1
2
3
Schottky diode
Terminal cover
Always turn the power switches on and
off in the following order:
ON: Transmitter -> receiver (amp switch)
OFF: Receiver (amp switch) -> transmitter
If the power switches are operated in the
opposite order, the vehicle may run
unexpectedly and an extremely dangerous
situation may occur.
If a peddle or other foreign object gets
caught in the gears or the vehicle hits
an obstruction, do not try to forcefully
run vehicle.
Forcefully running the vehicle will cause trouble.
Do not touch the motor or MC800C
Ver.2 immediately after running.
Touching the motor or amp immediately after
running may result in serious burns.
When going to and returning from the
circuit, and when storing the model,
always remove the Nicd battery.
If the switch is turned on erroneously, control
may be lost or a fire may start.
Turn the power switches on in the state
where the vehicle is floated.
When turnning on, depending on the
receiver used, a motor may rotate for a
moment. Be careful not to injure a finger etc.
by rotation of the wheels.
Always perform a check of operation before running.
When making adjustments, remove the motor, or place
the vehicle on a stand, so that it cannot run.
When not set up correctly, the vehicle may run unexpectedly
and an extremely dangerous situation may occur.
Do not run the vehicle in the rain or through
puddles or on muddy or snowy roads.
If moisture enters the amp, erroneous
operation may cause loss of control and an
extremely dangerous situation may occur. It
may also cause amp trouble. Should
moisture enter and cause erroneous
operation, send the MC800C Ver.2 out for
repair and inspection.
If the motor is connected to the speed
control, you must not run the motor by
connecting a separate battery.
This will wreck the unit.
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