© LRP electronic GmbH 2008
Order No.:
auto hill brake
No Reverse delay
Dear Customer,
thank you for your trust in this LRP product. By purchasing a LRP Crawler Reverse speed-control, you have chosen one of the most advanced speed-controls of today. This speed-control with all of its high-tech features and
specially selected electronic components is one of the best speed-controls currently available on the market.
• Special Crawler Software
• Super-strong 6.0V / 5.0A BEC
• AutoCell System
• Multi-Protection System
• No Reverse Delay
user manual
• Adjustable Auto-/Hill-Brake (10 steps)
• 4 unique Crawler throttle profiles
• Sensored Design
• Tamiya Style Connectors
• Small and lightweight design
Please read the following instructions carefully before you start using your LRP Crawler Reverse speed control. This
user guide contains important notes for the safety, the use and the maintenance of this product. Thus protecting
yourself and avoid damages of the product.
Proceed according to the user guide in order to understand your LRP Crawler Reverse speed control better. Please
take your time as you will have much more joy with your product if you know it exactly.
This user manual shall be kept in a safe place. If another customer is using this product, this manual has to be handed
out together with it.
LRP electronic GmbH
Wilhelm-Enssle-Str. 132-134
73630 Remshalden
1. Installation
3. specifications
• Connect the speed-control to the receiver (position: Channel 2)
The LRP Crawler Reverse comes pre-wired using common JST motor connectors. It‘s simply „plug &
play“ when you intend using a designated LRP Brushless motor, see picture below! You can of course
also use optional 2.6mm² power wires for a „hardwired“ setup without connectors.
Speedo MOT.A to motor „A“
• Blue power-wire
• Yellow power-wire
Speedo MOT.B to motor „B“
• Orange power-wire
Speedo MOT.C to motor „C“
• Connect the hall sensor cable to the speed-control and the motor.
Brushless + Brushed
Brushless + Brushed Adaption
Case Size
Weight (excl. wires)
Voltage Input
Voltage Drop Brushless @20A*
Rated Current Brushless*
Compatible winding styles
0.026V / phase
200A / phase
Voltage Drop Brushed @20A*
Rated Current Brushed*
Rec. Motor Limit Brushed
Optional Push Brake
Motor Rotation Selection
High Frequency
Sensored Brushless System
over 13 turns
Rec. Motor Limit Brushless
over 7.5 turns
Tamiya Style Connectors
* Transistors rating at 25°C junction temperature
** measured at 7.2V
4 adj Modes (NiMH/LiPo, Drive- & Motor Rotation-Selection, Throttle Profiles, Auto-/Hill-Brake) yes
Specifications subject to change without notice.
4. installation tips
• Position the speed-control and capacitor where they are protected in the event of a crash and gives you easy
access to the connectors and buttons.
• Make sure there is enough clearance between the speed-control, power-wires, antenna and receiver. Avoid
any direct contact between power components, the receiver or the antenna as this can cause interference.
If interference occurs, position the components at a different place in the model.
Hall Sensor Wire
• MOT.A (blue) and MOT.B (yellow) will be the combined „minus“ on the brushed motor.
• MOT.C (orange) wire will be „plus“ on the brushed motor.
• Mount the speedo and capacitor using the supplied thick/black doubled-sided tape.
• ONLY FOR BRUSHED MOTORS! Motors with no capacitors or not enough capacitors may interfere with the
speed-control. To avoid this, solder the supplied capacitors to your motor.
5. radio / speed-control set-up
In setup mode the LRP Crawler Reverse stores every step when you press the SET button. All the settings will be
stored in the speed-controls memory even if the speed-control will be disconnected from the battery.
Setup the following basic functions on your transmitter (if available):
Together to minus
Throttle Travel
Brake Travel
Throttle Exponential
Neutral Trim
Servo Reverse
other names in radio
SUB Trim
Throttle Reverse
Required Setting
start with 0
any setting, don‘t change after set-up procedure!
MOT.A (Blue)
On/Off - Switch
BAT - (Black)
2. connections
• Ensure that the speed-control is not connected to the drive battery and is switched off.
• Remove motor pinion or ensure that the wheels of the model are free to rotate.
• Switch the transmitter on and set the transmitter throttle stick to neutral.
MOT.B (Yellow)
If your transmitter doesn‘t offer any of above functions, it‘s already in „basic setup“ mode.
BAT + (Red)
• Doublecheck all connections before connecting the speed-control to a battery.
CAUTION: If battery is connected with reversed polarity it will destroy your speed-control!
• Red power-wire
 Speedo BAT+ to battery „Plus“
• Black power-wire
 Speedo BAT- to battery „Minus“
• The speed-control is now ready to be set-up (see section 5).
MOT.C (Orange)
• 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. See also the instructions supplied
with your radio control system.
Unique Crawler profiles
brushless + brushed
• Connect the speed-control to the battery and switch the unit on.
• Hold the SET button pressed for at least 3sec.
 You entered setup mode and the SET LED flashes red (it will flash until the setup is completed).
• Leave transmitter in neutral position and press the SET button once.
 Neutral setting is stored , MODE LED flashes green and the motor beeps.
Power Capacitor
• Hold full throttle on transmitter and press the SET button once.
 Full-throttle setting is stored, MODE LED flashes red.
This LRP speed-control is equipped with an LRP Multicon
receiver wire. As supplied, it will easily fit in all ordinary
• Hold full brake on transmitter and press the SET button once.
 Brake setting is stored, LED‘s glow red (MODE) and red (SET).
Hall Sensor Connector
This bi-directional multipole wire connects the speed-control and the motor. Do not alter or modify this cable!
There are replaceable/optional hall sensor wires available: • #81910 (20cm) • #81920 (10cm)
The LRP Crawler Reverse comes pre-wired using common Tamiya/JST battery connector and JST motor connectors. It‘s simply „plug & play“ when you intend using a designated LRP Brushless motor! There are optional
2.6mm² power wire sets available (#82505), which allow you to use a „hardwired“ wire setup. The unique
splitted solder-tabs allow easy and convenient replacement of the power wires. Nevertheless some soldering
skills are required. Talk to your local hobbyshop if you are concerned about replacing the wires yourself.
CAUTION: Be very careful with the correct wire sequence since an incorrect connection may damage the
speed-control! Avoid creating solder bridges on the solder-tabs and isolate all connections carefully. Avoid
soldering longer then 5sec per soldering joint.
• This completes the setup procedure and your LRP Crawler Reverse is ready to use.
• If you make a mistake during the setup procedure, don‘t worry: Disconnect the battery for about 10sec and
start again from the first step.
• At the end of each run switch of the car, and then switch off the transmitter.
• At the start of each run switch on the transmitter first, then switch on the car.
• For storage of the car, disconnect the drive battery at any time!
Check the LED‘s when moving your throttle stick and you will see if everything is setup correctly.
Neutral (Auto-/Hill Brake disabled)
Neutral (Auto-/Hill Brake enabled)
--partial throttle
full throttle
partial brake
full brake
8. special Features
6. mode programming
All modes are available for brushless and brushed motors (speedo adapts automatically). The LRP Crawler
Reverse features 4 modes which enable you to adjust it to YOUR special requirements. The factory settings
are shown in grey colour.
• How to get into „programming the modes“
 Press MODE button for 3 or more seconds.
• How to check the stored values  Count the number of flashes of the red SET-LED
(* = value 1 | ** = value 2 | etc.).
• How to change the value
 Press SET button to increase value by one step.
• How to get to the next Mode
 Press MODE button once.
• How to leave the programming mode
 If you are in MODE.4, press the MODE button
one more time, which will also store the settings!
• Table of settings, values and modes: see below (grey-shaded values show „works default settings“).
MODE.1 (AutoCell System):
Fwd/Rvs (no Brake)
Fwd/Rvs (no Brake)
CW Motor Rotation
CW Motor Rotation
MODE.3 (Throttle Profiles): allows you to perfectly adjust the LRP Crawler Reverse to your likes. All
profiles apply for forward and reverse direction.
Expo Curve
Super Smooth Ramp
Expo Curve
Smooth Ramp
Expo Curve
No ramp
Throttle Profiles: finest throttle control at low rpm was the aim and the LRP engineering team definitely
succeded! The LRP Crawler Reverse allows fine adjustments of the the throttle curve with it‘s four individual
„Crawler Special“ maps to your special requirement.
Going from lowest to highest automatic brake setting
(value 1 = minimum / value 10 = maximum)
Manual Brake: as a first for Crawler speedos, the LRP Crawler Reverse includes a mode with optional manual
brake, which can be used in addition to the Auto-/Hill-Brake and gives you more tuning options to adjust your
vehicle to the special crawler circumstances.
The brake is applied evenly in both directions, no matter if you come from „forward to reverse“ or from „reverse to forward“ direction for maximum control on steep ramps. „Double Action“ on throttle is required to
change from „brake to reverse“ mode, e.g. you have to return to neutral briefly to change function from brake
to reverse.
Note: this brake function is available in Mode.2 profiles #2 and #4. When selecting #1 or #3 you will have no
manual brake. This special „manual brake“ function will require slightly different driving style and you should
practice with this function to fully benefit from it and to see if you like it or not.
5A BEC: the LRP Crawler Reverse‘s super-strong 6.0V/5.0A BEC will power all your strong digital servos or
even multi-servo vehicles with pleasure!
MODE.4 (Auto-/Hill-Brake): allows you to set the amount of braking action which is applied in the neu-
to all crawler-applications and -models.
You can choose from from two different drive modes (with or without manual brake) and also reverse motor
rotation direction for vehicles with counter-rotating gearboxes or opposed transmission.
tral range of the throttle position.
(same time)
Drive Selection & Motor Rotation: this versatile function allows you to adjust your LRP Crawler Reverse
perfectly to your application or crawler terrain. Higher settings mean higher amount of braking, up to „wheel
locking“ brake action demanded by many crawler specialists!
MODE.2 (Drive Selection & Motor Rotation): the LRP Crawler Reverse allows you to select from two
different drive modes (with or without manual brake) in both motor rotation directions.
toCell System ensures that LiPo batteries can be used safely without accidentially deep-discharging of the
cells. The motor function will be shut-off and the SET LED will flash if the system recognises very low battery
Auto-/Hill-Brake: the LRP Crawler Reverse‘s high brake levels allow you to adjust the „drag“ of your vehicle
4-6cells NiMH
(LiPo Cut-Off disabled)
AutoCell System: Ready for the next battery technology – LiPo batteries! LRP’s exclusive and smart Au-
Automatic Brushless / Brushed Adaption: detects the connected motor type during turn-on/initialisation and adjusts the correct brushless or brushed operation automatically. No adjustments required by yourself,
apart from the correct connection of each motor type (don‘t forget the hall-sensor-wire for brushless!).
Caution: Keep in mind, when swopping between brushless and brushed motors, that the chosen mode values
will be identical!
Power Capacitor: Never disconnect the installed power-capacitor! It must be used with brushless and
brushed motors. If the capacitor becomes damaged (dented, domed or swollen), speed-control failure may
occur and therefore immediately replace a damaged capacitor.
Caution: longer wires to power-capacitor will decrease performance!
9. troubleshooting guide
EXPLANATION: If no remark, cause can be either with brushless or brushed motor. If „BM“ is indicated, cause
only relating to brushed motor.
Servo is working, no motor function.
Speed-control plugged in incorrectly
Plug speed-control in Ch 2
Wiring problem
Check wires and plugs
Sensor Wire missing/defective
Install/replace sensor wire
Motor defective
Replace motor
BM - Motor brushes stuck
Check that brushes are moving freely
Overload protection activated
Allow speed-control to cool down
Speed-control defective
Send in product for repair
Speedo connected to receiver with wrong polarity
Connect speedo with correct polarity
Battery defective
Replace with different battery pack
Crystal defective
Replace components one by one.
No servo and no motor function.
Changing Mode settings without the transmitter: At most events you usually do not have access
to your transmitter, but never mind since you can simply disconnect the receiver lead from the receiver and
change the MODE settings as described in section 6 „Mode Programming“.
Works-Default-Settings: All LRP speed-controls come factory-adjusted (defaults are grey-shaded above).
If you loose track of the modes, you can restore the works default settings. With the transmitter switched on,
hold the SET button pressed while you switch on the speed-control. This returns the unit to the LRP works
default settings.
Sensored Brushless Technology: Advanced Digital allows the perfect knowledge of the brushless
motor’s magnet position. This results in perfect motor control at high and low RPM‘s, as well as perfect brake
Multi-Protection System, 3-way protection: The perfect protection against short-circuits (motor),
overload and overheating. If your speed-control faces overload, the motor function will be shut-off for protection and the SET LED will flash, although the steering function is maintained. Let the speed-control cool down
for a few minutes. If you experience frequent shutdowns, check functions with troubleshooting guide.
Receiver defective
Transmitter defective
Speed-control defective
Send in product for repair
Sensor Wire defective
Replace Sensor Wire
Motor or Sensor Board in motor defective
Replace sensor board or motor
Power Capacitor damaged
replace Power Capacitor
Speed-control defective
Send in product for repair
Motor runs in reverse when accelerating forward on the transmitter.
Vehicle has reversed gearbox
Change motor rotating direction in Mode.2
BM - Motor connected incorrectly
Connect motor correctly
Insufficient performance.
E.g. poor brake power, topspeed or
Motor pinion too big or gear ratio too long.
Use smaller motor pinion/shorter gear ratio
Transmitter settings changed after set-up
Repeat set-up procedure
Power Capacitor damaged
Replace Power Capacitor
BM - Motor worn out
Maintain motor
Motor defective
Replace motor
Speed-control defective.
Send in product for repair
Motor stronger than motorlimit or input voltage
too high
Use only motors and batteries which are within
the specifications of the speed-control
Motor pinion too big or gear ratio too long.
Use smaller motor pinion/shorter gear ratio
Drive train or bearing problems.
Check or replace components.
Model used too often without cool-down periods
Let speed-control cool down after every run
Transmitter settings changed after set-up
Repeat set-up procedure
Humidity/water in speed-control
Immediately unplug and dry speed-control
Motor or Sensor Board in motor defective
Replace sensor board or motor
BM - Motor suppressors not sufficient
Solder capacitors to motor
Receiver or antenna too close to power wires,
motor, battery or speed-control.
Receiver aerial too short or coiled up
See „Installation Tips“ and „Installation“
Receiver defective, too sensitive;
Transmitter defective, transmitter output power
too low, servo problem
Replace components one by one
Only use original manufacturers crystals
Poor battery connection
Check plugs and connecting wires
Transmitter batteries empty
Replace / recharge transmitter batteries
Transmitter antenna too short
Pull out antenna to full length
Motor stutters while accelerating
Speed-control overheats or
switches off frequently.
Motor never stops, runs at constant
slow speed
Radio interference
repair procedures / limited warranty
All products from LRP electronic GmbH (hereinafter called “LRP”) are manufactured according to the highest
quality standards. LRP guarantees this product to be free from defects in materials or workmanship for 90
days (non-european countris only) from the original date of purchase verified by sales receipt. This limited
warranty doesn’t cover defects, which are a result of misuse, improper maintenance, outside interference or
mechanical damage.
„This applies among other things on:
• Cut off original power plug or not using reverse polarity protected plugs
• Receiver wire and/or switch wire damaged
• Mechanical damage of the case
• Humidity/Water inside the speed control
• Mechanical damage of electronical components/PCB
• Soldered on the PCB (except on external solder-tabs)
• Connected speed-control with reversed polarity“
To eliminate all other possibilities or improper handling, first check all other components in your model and the
trouble shooting guide, if available, before you send in this product for repair. If products are sent in for repair,
which do operate perfectly, we have to charge a service fee according to our pricelist.
With sending in this product, the customer has to advise LRP if the product should be repaired in either case. If
there is neither a warranty nor guarantee claim, the inspection of the product and the repairs, if necessary, in
either case will be charged with a fee at the customers expense according to our price list. A proof of purchase
including date of purchase needs to be included. Otherwise, no warranty can be granted. For quick repair- and
return service, add your address and detailed description of the malfunction.
If LRP no longer manufactures a returned defective product and we are unable to service it, we shall provide you
with a product that has at least the same value from one of the successor series.
The specifications like weight, size and others should be seen as guide values. Due to ongoing technical improvements, which are done in the interest of the product, LRP does not take any responsibility for the accuracy
of these specs.
The crossed-out wheeled bin means that within the European Union the product must be
taken to seperate collection at the product end-of-life. Do not dispose of these products as
unsorted municipal waste.
Package your product carefully and include sales receipt and detailed description of malfunction.
Send parcel to your national LRP distributor.
Distributor repairs or exchanges the product.
Shipment back to you usually by COD (cash on delivery), but this is subject to your national LRP distributor‘s
general policy.
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