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Operating Instructions
Carbon Series Speed Control "20 Turns"
Item No. 2250414
Intended Use
The product is connected to the radio controlled receiver of a model vehicle and serves as a
continuous RPM control of an electric motor of model vehicles.
Contact with moisture, e.g. in bathrooms, must be avoided under all circumstances.
For safety and approval purposes, you must not rebuild and/or modify this product. If you use
the product for purposes other than those described above, the product may be damaged. In
addition, improper use can result in short circuits, fires, electric shocks or other hazards. Read
the instructions carefully and store them in a safe place. Make this product available to third
parties only together with its operating instructions.
This product complies with the statutory national and European requirements. All company
names and product names are trademarks of their respective owners. All rights reserved.
Delivery Content
• Speed control
• Operating instructions
Up-to-date Operating Instructions
Download the latest operating instructions at www.conrad.com/downloads or
scan the QR code shown. Follow the instructions on the website.
Explanation of Symbols
The symbol with the exclamation mark in the triangle is used to indicate important
information in these operating instructions. Always read this information carefully.
The arrow symbol indicates special information and advice on operation.
Safety Instructions
Read the operating instructions carefully and especially observe the safety
information. If you do not follow the safety instructions and information
on proper handling in this manual, we assume no liability for any resulting
personal injury or damage to property. Such cases will invalidate the warranty/
guarantee.
a) General Information
• The device is not a toy. Keep it out of the reach of children and pets.
• Do not leave packaging material lying around carelessly. This may become
dangerous playing material for children.
• Protect the appliance from extreme temperatures, direct sunlight, strong jolts, high
humidity, moisture, flammable gases, steam and solvents.
• Do not place the product under any mechanical stress.
• If it is no longer possible to operate the product safely, take it out of operation and
protect it from any accidental use. Safe operation can no longer be guaranteed
if the product:
- is visibly damaged,
- is no longer working properly,
- has been stored for extended periods in poor ambient conditions or
- has been subjected to any serious transport-related stresses.
• Please handle the product carefully. Jolts, impacts or a fall even from a low height
can damage the product.
• The speed control must not become damp or wet.
• Do not short-circuit the connecting cables, as this would destroy the speed control.
The same applies to overload (e.g. when using an unsuitable motor) or when the
polarity is not correct. Never connect a Schottky diode to the motor. Only use an
electric motor with interference suppression. Connect only one electric motor to
the speed control.
• Disconnect the battery from the speed control when the speed control is not
needed. The speed control can be temporarily switched off using the on/off switch.
• Always turn on the transmitter first before connecting the speed control with the
battery and switching it on!
• Before turning off the transmitter, turn off the speed control and, if necessary,
disconnect it from the battery.
• The speed control is designed for NiMH/NiCd batteries (6-7 cells).
Caution! It can also be used with 2-cell LiPo rechargeable battery packs,
however in this case there is no undervoltage safety shutdown. If a LiPo battery
pack is used with the speed control, the LiPo battery pack will be damaged if
totally discharged!
• The heat sink becomes very hot during operation, risk of burns!
All manuals and user guides at all-guides.com
Operation
a) Installation
Install the speed control with double-sided tape (or with a hook-and-loop tape strip) as far away
from the receiver as possible. The engine power cable, the battery cable and the thin control
cables must be installed as far away from the aerial cable as possible (the aerial cable should
run directly from the receiver to the aerial holder). Otherwise the model can show malfunctions
or the radio range might be reduced.
Make sure the speed control is sufficiently cooled. It must not be used without the heat sink.
The cables must not get into moving parts, secure them with cable ties. The cooling fins must
not be covered.
b) Connection
• Connect the two thick motor cables with the motor. If the motor is rotating in the wrong
• Connect the three-pole plug to your receiver. Make sure the assignment on the receiver is
• As the speed control is equipped with a BEC, no receiver battery or rechargeable battery
• Install the on-off switch of the speed control in the vehicle. Put the switch in the "OFF"
c) Operating the Vehicle
• Turn on your transmitter. (Check battery state!) Put the trim control in centre position. Put
• The switch on the speed control must be set to the "OFF" position.
• Insert the battery pack into the vehicle and connect it to the speed control.
• Let go of the throttle or put it in neutral position. Put the acceleration/brake trim control in
• Switch on the speed control (put switch in the "ON" position).
• The motor responds with a confirmation tone and the two LEDs on the speed control flash
• The speed control is now ready for operation, you can steer the vehicle using the remote
• The LED lights up green in neutral position. It flashes quickly when driving forward and
d) End of Operation
• First switch off the speed control (put switch in the "OFF" position).
• Disconnect the battery from the speed control.
• Turn off the transmitter.
• Consult an expert when in doubt about the operation, safety or connection of the
appliance.
• Maintenance, modifications and repairs must only be completed by a technician
or an authorised repair centre.
• If you have questions which remain unanswered by these operating instructions,
contact our technical support service or other technical personnel.
b) Connected Devices
• Also observe the safety and operating instructions of any other devices which are
connected to the product.
direction, swap the two motor cables or set the servo reverse function correctly on the
remote control to ensure that forward drive, brake and reverse drive will function properly.
Do not swap the cables connected to the battery - this will destroy the speed control.
Warranty/guarantee void!
correct (see operating instructions of the receiver as well as the information on the receiver).
- Yellow/white/orange cable: Control signal
- Red cable: Operating voltage
- Brown/black cable: Earth
may be used! The receiver is powered by the vehicle battery directly through the speed
control.
position.
the throttle in neutral position.
Place the model vehicle so that the drive wheels do not touch the ground or any
objects. Do not touch the drive mechanism and do not block it! Risk of injury!
centre position. Do not move the throttle.
quickly (approx. 2 seconds). Then motor plays another confirmation tone "DO-RE-MI" and
neutral position is saved. The greed LED on the speed control is lit permanently (the red
LED is off).
control.
When changing between forward and reverse drive, the throttle must be put in
neutral position for a short time.
If the throttle lever is moved directly from forward to reverse drive, the brake of the
speed control is activated (vehicle does NOT reverse!)
Should the vehicle respond exactly opposite to your input, swap the two motor
cables or set the servo reverse function correctly on the remote control.
slowly when reversing. If the LED is lit red permanently when driving forward, the end
position has been reached (full throttle).
If the transmitter signal is lost, the speed control turns off the motor for safety
reasons (the steering servo will vibrate, however, if no failsafe is installed).
If the speed control overheats, the motor will be turned off as well. In this case,
check the drive transmission or the motor type.
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