Dear Customer,
thank you for your trust in this LRP product. By purchasing a LRP Quantum Reverse 2 digital series speed-con-
trol you have chosen a high-performance product full of new design features, such as:
WARNING NOTES
SPECIFICATION
• Affix the speed-control using the supplied doublesided adhesive tape.
• Make sure there are enough cooling slits in the body. This will increase the performance and life of all the
electronic components.
• Position the speed-control where it is protected in the event of a crash.
• Install the speed-control so that you have easy access to the plugs and the SET-button.
• Make sure there is enough clearance (about 3cm) between the speed-control, power cable and antenna
receiver. Avoid any direct contact between power components, the receiver or the antenna. This can cause
interference. If interference occurs, position the components at a different place in the model.
• The aerial should be run vertically up and away from the receiver. Avoid contact with any parts made of
carbon fibre or metal. If the aerial is too long, don’t coil up the excess length. It is better to cut it down to a
length of about 35 cm. See also the instructions supplied with your radio control system.
INSTALLATION TIPS
CONNECTIONS
POWER WIRES:
The QR2 series comes pre-wired using common „Tamiya/JST-
style“ battery and motor connectors. It‘s simply „plug & play“
when you intend using a designated motor!
The unique splitted solder-tabs allow easy and convenient re-
placement of the power wires, if you plan using a „hardwired“
wire setup with different connectors (use polarised connecting
systems only!). Nevertheless, some soldering skills are re-
quired. Talk to your local hobbyshop if you are concerned about
replacing the wires yourself.
RECEIVER CONNECTING WIRE:
This LRP speed-control is equipped with a LRP Multicon receiver
wire. As supplied, it will easily fit in all ordinary receivers.
Motors with no capacitors or not enough capacitors may interfere with the speed control. To avoid this, solder
the supplied capacitors to your motor (see picture).
INSTALLATION
• Solder the capacitors to the motor.
• Attach the speed-control to the model.
• Connect the speed-control to the receiver (position: channel 2).
• (QR2 Bullet ONLY!) > Connect the external fet lead, if you are using such a servo.
• Connect the speed-control to the motor. Yellow wire PLUS, Blue wire MINUS.
• Then check all the connections before connectiong the speed-control to a battery.
CAUTION: if a connection is incorrect, it will destroy the speed-control.
• The speed-control is now ready to be set-up (see back page).
• Ultra High Performance using SMD Mosfet‘s
• Small in size, super lightweight
• Real-Time-Braking
• Extended runtime
• Racing mode, reverse switch off
• Plug-in-and-Drive.
* Transistors rating at 25°C junction temperature. Specifications subject to change without notice
** @ 6 cells (7,2V) with single motor.
MOTOR SUPPRESSION
CAUTION: Never use schottky dio-
des in conjunction with a forward/
reverse speed-control such as the
QR2 series speed-controls.
Please read and understand these instructions completely before you use this product!
With operating this product, you accept the LRP warranty terms.
.
ORDER NO.:
84110
FORWARD + REVERSE
OVER 14 TURNS
RA00123
USER GUIDE
ORDER NO.:
84210
ORDER NO.:
84310
FORWARD + REVERSE
OVER 11 TURNS
FORWARD + REVERSE
OVER 7 TURNS
SPECIAL FEATURES
RACING MODE, switch off reverse
You have the option of switching off reverse for racing. The speed-control then uses the full reverse range as
a brake only.
REVERSE OPERATION
An additional protective function is the 8sec time limit in reverse. If you run your model for longer than 8sec,
the speed-control switches to neutral. Move the throttle stick briefly to neutral, and you can then use reverse
for a further 8sec.
Extensive testing has shown that this limit never gets reached in normal use.
REAL-TIME-BRAKING
In contrast to conventional forward/reverse speed-controls, the QR2 series has a real-time-brake. It works
fully proportional in operation until your vehicle comes to a complete stop. The unit then switches to reverse
without any annoying delays.
MULTI-PROTECTION-SYSTEM, 3-way protection
This unique monitoring software is the perfect protection for the QR2 series speed-controls against short-cir-
cuits (motor), overload and overheating. If your speed-control is ever faced with overload, the motor function
is switched off for protection and the LED will flash red/green to indicate the overload, although the steering
function is maintained. Wait a few minutes to allow the speed-control to cool down.
If the speed-control switches off frequently, either the motor used is too strong, the motor pinion is too big or
you are using full brake too often.
IMPORTANT:
The supplied heatsink improves and safeguards the performance
capacity of your QR2 speed-control when used close to it‘s spe-
cified limits.
Use only the genuine QR2 series heatsink (#81123) and attach
it using the supplied heat-transfering double-sided tape (thin/
clear). Do not use any other tape to attach the heatsink!
• IMPORTANT: Never leave your RC model unsupervised when the
battery is plugged in. If a defect occurs, it could set fire to the model
or the surroundings.
• Never wrap your speed-control in plastic film or metal foil. In fact,
make sure it gets enough fresh air.
• Avoid soldering longer then 5sec per soldering joint when replacing
the power wires to prevent possible damage to the speed-control
due to overheating of the components!
IMPORTANT: Pay close attention to the following points, as they will
destroy the speed-control and void your warranty:
• Never solder a Schottky diode to the motor when you are using a
Quantum Reverse 2 speed-control. A Schottky diode will destroy
any forward/reverse speed-control.
• Never allow the speed-control or other electronic components to
come in contact with water. Do not operate the speed-control in
the rain. If you ever have to operate in the rain, protect your speed-
control properly to avoid that water reaches the speedo.
• Never cut off the original power plug.
• If the speed-control is connected to the motor, never run the motor
directly with a separate battery or run-in device.
• Never connect the speed-control incorrectly or with reversed pola-
rity.
• All wires and connections have to be well insulated. Short-circuits
will destroy the speed-control. Pay special attention to the receiver-
and switch wires.
• Never change the polarity of the receiver connector.
• Never open the speed control and never solder on the PCB (except on
external solder-tabs).
• If you use more than 6 cells in the drive battery, the motor limit rises
by 2 turns for each additional cell.
Product
QR2 Super QR2 Pro QR2 Bullet
Order.No.
84110 84210 84310
Forward/Brake/Reverse yes yes yes
Case Size 26.0x26.0x15.7mm 26.0x26.0x15.7mm 26.0x26.0x15.7mm
Weight (excl.wires) 16.5g 17.0g 18.0g
Voltage Input 4-7 cells (4.8-8.4V) 4-7 cells (4.8-8.4V) 4-7 cells (4.8-8.4V)
Typical Voltage Drop@20A* 0.075V 0.060V 0.050V
Rated Current* 50A 65A 75A
Rec. Motor Limit** Over 14 Turns Over 11 Turns Over 7 Turns
B.E.C. 5.0V 5.0V 5.0V
PWM Frequency yes yes yes
Multi-Protection-System yes yes yes
Connectors Standard Tamiya Style Standard Tamiya Style Standard Tamiya Style
Setup Procedure Single button Single button Single button
Switching OFF • Switch speed-control Off
Reverse
• Press and hold the SET-button
• Switch speed-control On while SET-button is pressed
Switching ON • Switch speed-control Off
Reverse
• Press and hold the SET-button
• Switch speed-control On while SET-button is pressed
Receiver Lead
On/Off Switch
Motor Connectors
(yellow = plus)
(blue = minus)
Tamiya Connector
(Battery)
Fet-Servo lead
(blue), only for
QR2 Bullet
LRP electronic GmbH
Wilhelm-Enssle-Str. 132-134, 73630 Remshalden, Germany
Tel.: int+49-7181-4098-0, Fax: int+49-7181-4098-30
INFO@LRP-ELECTRONIC.DE WWW.LRP-ELECTRONIC.DE
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