Yokomo X Series User manual

1.Introduction
Thank you for trusting YOKOMO products. Purchasing RPXII Competition Brushless ESC
means that you selected the best ESC out of currently existing ones. This ESC is integrated
with Hi-Tech features, and it is the most outstanding ESC you can get in the market. It
is very dangerous when used improperly or remodeled without an approval, and this
can cause critical damages to peripheral products & devices. Please carefully read this
manual before use of this product.
2.Caution
■To avoid short circuit, please check if the wires and connections of the ESC are
protected and are not in contact with peripheral devices.
■Be well-acquainted with the user manual for power devices / chassis before use, and check with the operating ranges.
■Use a soldering iron with at least 60W for soldering all input / output wires and connections.
■Keep the operation atmosphere dry in order to protect the ESC from humidity, water, oil, and other substances.
■Allow the product to have good ventilation, and be cautious for overheat.
■The ESC must be separated from the battery after use.
3.Features
■Full aluminum case and heat sink design
■Full compatibility with modified and stock race
■The excellence of the software reduced the motor temperature by modifying commutation algorithm and upgrading
hardware, and it also increased the speed.
■New turbo / 3 Models of boost timing setting and delay time setting.
■It became possible to have various types of race and controls by setting new brake response mode and PWM / brake
frequency individually.
■It is settable by connecting ESC to a program box or WiFi module with separated program port
■Using new WiFi module, the user can set the program parameter and upgrade the firmware. Also, all the ESC & motor
data such as temperature, current, voltage, RPM and battery consumption can be stored in real time with the data
log.
■Using superlative FET and low resistance power PCB design
■Maximizing the cooling with a 30mm fan
4.Specification
Pure Brushless Competition yes
Motor Limit >3.0T
Operating voltage 3.7-7.4V
Forward / Brake / Reverse yes
Full aluminum case / heatsink yes
Typ. Voltage Drop @20A per phase 0.0048V
Rated Current per phase 2449A
USB Software Updateability yes
Plugged 30x30x10mm Fan yes
BEC Output 6V,7.4V / 6A Linear
Multi-Protection-System yes
"Boost 0“ Mode yes
Multi-frequency system yes
Power Wires 12Awg
Case Size(without fan) 32.9 x 34.6 x 19.60mm
Weight(without cable) 44g
BRUSHLESS SPEED CONTROLLER RPXII COMPETITION Instruction Manual

5.Connection
■Caution
For maximum performance, black silicon wire without any connector was used for provided 12AWG wire. For soldering
the battery and motor wires onto the solder bar, we recommend the soldering iron with at least 60W, and try to avoid
soldering more than 5 seconds. Overheat can damage the ESC. With provided tube, it is possible to prevent the short
circuit and to check the polarity after connection.
■Motor wire connection
When connecting ESC and motor, the wire A/B/C should go to where they belong. However, some cars have their
wirings in opposite way. For this case, you can switch from A-B-C to C-B-A on Motor-Wiring setting. If changed it to C-B-A,
then the C & A should be switched on the figure above, and incorrect setting and connection can cause a critical
problem. For your information, if the ESC is reset, then the C-B-A wiring setting will be back to A-B-C, so switch it to C-B-A
again and then use. Then connect the sensor wire to 6-pin sensor port.
■Power capacitor
Do not ever drive without power capacitor. This is absolutely needed to protect the ESC and improve the punch. Proper
polarity is very significant. Connect indicated red wire in the figure above to (+) of the ESC. Connect another wire to (-)
of the ESC, and the connected wire should be short. Incorrect connection and poor soldering will damage the ESC. The
warranty does not cover this part.
■Battery wire connection
Proper polarity is very significant. Make sure if (+) wire is connected to (+) of the battery, and vice versa for (-) wire. If
connection is not adequate, then it will surely damage the ESC. The warranty does not cover this part.
■Receiver wire connection
Throttle wire of the ESC should be connected to 2CH of the receiver, and the white indication of the wire is the signal.
This wire supplies 6/7.4V voltage to receiver and servo and others, therefore, there is no need of additional battery
connected to receiver. If external power is connected to the receiver, the ESC might get damaged.
Note!
If you want to use a separate battery for the receiver, not using the ESC power, the middle wire(+)
of the BEC plug should be disconnected as shown in the figure. This will prevent reverse current to
the ESC. Otherwise the ESC can be burned by overheating.
■Power switch box
To power on/off the ESC, you can use the Power Switch Box by connecting it to the connector on the side of the ESC.
Without using it, the ESC will be powered on immediately when the battery is connected.
■Fan connector
A cooling fan, screws and fan protector are provided according to the ESC
specification. The fan mount is located on top of the heat sink, and it is recommended
to use fan under the extreme situation such as modified or 4WD off-road.
You need to remove the RED connector in the center and then connect to the port 1
to use the battery power. In this case, the fan operates all the time.

6.Connection Install Guide
■Locate the ESC in a safe place where is easily accessible to connector and buttons.
■Tightly fix the ESC with provided double-sided tape.
■Make sure that there is some distance among the ESC, power wire and antenna / receiver. Try to avoid the direct
touch among such parts. If the receiver and antenna are too close to each other, then signal confusion might be
occurred. If this happens, re-install the parts with more distance.
7.T ra ns mi t te r Se t ti ng s
Before connecting the ESC to the receiver, check the transmitter settings are set as below. (Default settings)
Throttle Travel High ATV,EPA 100%
Brake Travel Low ATV,EPA,ATL 100%
Throttle Exponential EXP,EXPO Start with 0
Neutral Trim SUB Trim Center
Trigger RATE Forward-Brake F50 : B50
■Make sure that the ESC is not connected to the battery and its power is OFF.
■Remove the motor pinion, or check if the wheels rotate freely while the car is over (not touching) the surface.
8.CALIBRATION TO TRANSMITTER
■Turn the transmitter on and place the throttle on the neutral.
■Connect the ESC to the battery, and then turn the switch ON.
■After the procedure above, then the ESC becomes possible to use.
■If motor moves at neutral position, it means there is difference with saved neutral value. Re-calibrate the throttle
range.
■It is possible to check the ESC settings are correctly done with the LEDs’ condition in accordance with the throttle
movement.
GREEN LED RED LED
Neutral ON OFF
Neutral(“BOOST OFF MODE”) Blinking OFF
Max Acceleration OFF ON
Max Reverse or Brake ON ON
Hold t he S ET b utton at l east f or 3
seconds. Release the button when GREEN
LED blinks. GREEN L ED t urns on with the
motor sound. “Neutral Position Save”
RED LED turns on when throttle i s moved
forward to t he m aximum. “ Acceleration Full
Position Save”
Both G REEN a nd R ED L ED t urn on w hen
throttle i s moved backward t o the maximum.
“Brake or Reverse Full Position Save”
Green and RED LED blink by t urns w hen
throttle i s moved to “ Neutral Position” and
motor sound occurs.

9.Programmable items
■You can set detailed setting parameters and check racing information & present data using the program card or WiFi
module decide. If motor is not connected, the program card is not connected. It can be connected using the front
3pin connector, and please refer to the manuals on the program card and WiFi module decide for further details.
Programmable Items Parameter Values Default
1 Select Battery LiPo / LiFe / NiMh(NiCd) LiPo
2 Cut Off Voltage Disable / Auto / 3.0V ~ 7.5V(Step:0.1V) Auto
3 Power Curve 0 ~ 10 5
4 Boost Mode
Boost Max + TB
Off X X
ON 0 ~ 58 0 ~ 58
+TH 0 ~ 58 0 ~ 58
+ATH 0 ~ 58 0 ~ 58
Off
5 Boost-TH. Limit TH Limit
10,20,30,40,50,60,70,80,90,100 0~58 0
6 Boost Min-rpm 0~64500(Step: 500rpm) 5000rpm
7 Boost Max-rpm 500~65000(Step: 500rpm) 25000rpm
8
Turbo Delay 0.0~ 1.00s (step: 0.05s) 0.20s
9 Turbo + Slope 0.0~ 1.00s (step: 0.05s) 0.20s
10 Turbo - Slope 0.0~ 1.00s (step: 0.05s) 0.20s
11 Acceleration 0~10 5
12 Start Power 0~100(step: 1%) 0%
13 Smooth Start Rate 0~30(step: 1) 0
14 Smooth Start Range 0~75%(step: 1%) 0%
15 Voltage Limit Off, 7.4V ~ 8.7V(step: 0.1V) Off
16 Reverse Function One Way / Two Way / Two Way2 / Two Way3 Two Way
17 Reverse Delay Off / 0.2s / 0.5s / 0.8s / 1.3s / 1.8s / 2.5s 2.5s
18 M- Reverse Amount 20% ~ 100%(step: 1%) 100%
19 Neutral Width Narrow / Normal / Wide Normal
20 Motor Direction Normal / Reverse Normal
21 Brake Response 0% ~ 100%(step: 1%) 0%
22 FAN Control Auto, On Auto
23 Drag Brake 0% ~ 100%(step: 1%) 0%
24 Min Brake Amount 0% ~ 100%(step: 1%) 30%
25 Mid Brake Amount 0% ~ 100%(step: 1%) 50%
26 Mid Brake Location 0% ~ 100%(step: 1%) 50%
27 Max Brake Amount 0% ~ 100%(step: 1%) 100%
28 Soft Brake Hard / Soft Soft
29
Brake Freq 1KHz ~ 16KHz(step: 1KHz) / 32Khz 1Khz
30 Motor Freq 1KHz ~ 16KHz(step: 1KHz) / 32Khz 5Khz
31 Drag Freq 1KHz ~ 16KHz(step: 1KHz) / 32Khz 1Khz
32 Cut Off Temp 100° ~ 135°(step: 5) / Disable 135°
33 Cut Off M-Temp 100° ~ 135°(step: 5) / Disable 135°
34 B.E.C Voltage 6.0V / 7.4V 6.0V
35 Gear Ratio 2.0 : 1 ~ 15.0 : 1 2.0 : 1
36 Tire Diameter 40mm ~ 200mm 63mm
37 Motor-Wiring A-B-C / C-B-A A-B-C

Programmable Items Parameter Values Default
38 Units Metric / English Metric
39 Download All parameters inside the setup card are downloaded to the ESC. -
40 Factory Setting Change the setting of ESC to default factory status. -
41 Current Voltage XX.X -
42 Current Temp 0°~ 135° -
43 Max Temperature 0°~ 135° -
44 Motor Temp 0°~ 135° -
45 Motor Max Temp 0°~ 135° -
46 Max Current 0 A ~ 999 A -
47 Maximum Speed XXX.X km/h -
48 Maximum RPM XXX rpm -
49 Error History M,T1,T2, S, V, R -
■1 Select Battery
It is extremely important to select correct battery type.
Otherwise, it could damage the battery.
■2 Cut Off Voltage
This function is to set the cut off voltage to protect the
battery.
■3 Power Curve
The parameters of the throttle curve are relating to the
position of the throttle and it impacts the output of the
ESC. Its default is “5” and the power curve should be
changed into other shapes using the PC program or WiFi
module. For example, if +EXP value is added at initial part,
the value of the initial output value is increased, and if –
EXP value is added, smaller throttle value is outputted.
■4 Boost Max+TB
OFF: All timing is disabled, and this can be set at the
condition of “True stock racing” etc.. green LED should
blink at neutral in this mode.
ON: The speed and efficiency of the motor is depending
on boost timing setting. When boost timing is bigger,
speed should be fast, and it also impacts the output
depending on the motor RPM. Higher values would
increase the power and RPM but also cause high heating.
So, excessive setting could cause fatal problems to the
ESC and motor.
TB(Turbo): should be activated when the throttle is located
at 100%. (Boost setting + TB setting) are applied into
timing. Although the combined value of the two can be
set up to 116, its upper limit is 88. If the motor timing is set to
more than 60 from the center, it can cause heating in the
motor and ESC. It is recommended to set to 60 or lower.
This item is an ideal for long straight course.
ATH: If the Auto Throttle function is set, the Boost does not
get affected by RPM, but operates only according to the
throttle ratio. For example, if the set value for the Boost is
30 and the throttle position is 40%, the operating boost
outputs “12” which is 40% of 30.
■5 Boost-TH. Limit
At Boost Mode, +TH mode allows the setting of timing limit
with 10 steps of the throttle location. Please refer to the
graphs below.
■6 Boost Min-rpm
This is to set the required RPM that causes the Boost timing
to be activated. For example, if the boost start timing is
set as 1000, when RPM reaches the 1000, timing should be
activated. It can be set 0~64500. This value cannot be set
higher than Boost Max RPM.
■7 Boost Max-rpm
After boost value is set, then rpm is set. For example, if
boost timing is set as 20 degree and boost finish RPM is set
as 20000, When the ESC reaches over 20000, then timing
boost is activated as 20 degree that you set. It can be set
500~65000. This value cannot be set lower than the value
of Boost Min-rpm.
■8 Turbo Delay
Turbo start should be immediately activated when the
throttle is moved to “full” when it is set as “0.00”, it is
immediately applied. When it is set as other values, the
turbo is activated after a delay time that is set at full
throttle location.
■9 Turbo + Slope
This is to set the slope time when turbo is activated. When
the value of this item becomes lower, acceleration and
heating are increased. This item is about time that reaches
up to “50”
■10 Turbo – Slope
After turbo timing is activated, when the throttle is back
to the original location from turbo condition, this item is to
set its applied time. When its value is lower, brake effect
occurs and movement of the vehicle becomes worse. This
item is about time that reaches up to “50”
TH(%)
rpm
Boost “ON” MODE “+TH” MODE
Boost Boost
Throttle
L imit

■11 Acce l e ratio n
This is to adjust the TIME that reaches the max output from
the motor at pause.
■12 Start Power
This is to be used when setting the minimum start power
and set the minimum power when the motor is rotated.
■13 Smooth Start Rate
The modified motor has a large output when starting,
which hinders a car from moving gently due to the strong
power of its start. This function allows a gentle start with
the effect of applying the boost value in “-“ direction
according to the set value.
■14 Smooth Start Range
This is to set throttle stick range for smooth start. For
example, if it is set to 50%, the smooth start function works
up to 50% of the throttle stick. If one of the Smooth Start
Rate and the Smooth Start Range is set to “0”, this function
does not work.
■15 Voltage Limit
This is to help stable racing by keeping the output
constant against voltage fluctuation. Based on the set
voltage, the output will be generated small if the battery
voltage is high and the output will be generated big if the
battery voltage is low.
■16 Reverse Function
One Way: forward/brake
Two Way: Forward/brake/reverse. Reverse is activated
after reverse delay. Brake is activated during this delay
period.
Two Way2: Forward / brake / reverse. Reverse is activated
after 1second at motor pause, regardless of the reverse
delay. Direction can be changed after max 6~7 seconds.
Two Way3: Forward / brake / reverse. When the motor
is rotated forward, if the throttle stick is moved to the
reverse, brake is activated. Even if the stick stays there,
reverse function is not activated. To function the reverse,
move the throttle stick to the neutral then back again to
the reverse direction then reverse is activated.
■17 Reverse Delay
This is to set the delay before reverse. After this delay,
reverse is activated.
■18 M- Reverse Amount
This is to set the max reverse speed to 20~100% during
driving.
■19 Neutral Width
This is to set the neutral width. This neutral width is
the barometer to determine the neutral position of a
transmitter.
■20 Motor Direction
This is to set the forward / reverse rotation of the motor.
■21 Brake Response
This is to adjust the strength of the brake. You can obtain
the strongest brake at 100%.
■22 FAN Control
In the Auto mode, it works depending on the ESC
temperature and throttle position. In the On mode, it
works all the time.
■23 Drag Brake
This is to set auto brake which delivers small brake effect
at neutral position.
■24 Min Brake Amount
This is to set the first brake amount.
■25 Mid Brake Amount
This is to set the middle brake amount.
■26 Mid Brake Location
This is to set the position on the middle brake amount.
This function is deactivated when mid brake amount and
mid brake location are set as 0%.
■27 Max Brake Amount
This is to set max brake range. Please leave the brake at
“FULL BRAKE” position.
■28 Soft Brake
This is to set the brake power like “Hard” or “Soft”. It is
recommended to use “Hard” brake when using Stock
Motor.
■29 Brake Freq
This is to set the brake frequency. When the frequency is
lower, control becomes also bigger, and if the frequency
is higher, soft control is achieved.
■30 Motor Freq
This is to set the motor frequency. When the frequency
is lower, initial acceleration becomes rapidly fast. When
the frequency is higher, it becomes softer, but the ESC
generates more heating.
■31 Drag Freq
This is to set drag frequency. When the frequency is lower,
the effect of the brake control is very good. When the
frequency is higher, soft control is achieved.
■32 Cut Off Temp
This is to set the cutoff temperature of the ESC. When this
function is disabled, the ESC cannot be protected from
the temperature, thus we do not recommend that you set
this function as disable.
■33 Cut Off M-Temp
This is to set the cutoff temperature of the motor. When this
function is disabled, the motor cannot be protected from
the temperature, thus we do not recommend that you set
this function as disable.
■34 B.E.C Voltage
This is to set the voltage that is supplied to a receiver. The
ESC could get damage due to wrong voltage setting, this
please make sure to use according to the servo spec.

■35 Gear Ratio
This is to set the gear rate of the vehicle. If this setting is not
done correctly, max speed could be indicated differently.
■36 Tire Diameter
This is to set the diameter of the tire. If this setting is not
done correctly, max speed could be indicated differently.
■37 Motor-Wiring
This is to set the order of motor cable connection like
A-B-C or C-B-A. When you need to change this, make
sure to also change the motor configuration and setting
identically. Otherwise, wrong configuration and setting
could cause the damage to the ESC.
■38 Units
You can change the unit to display temperature and
speed.
■39 Download
Changed setting value is stored at the ESC.
■40 Factory Setting
Changes the ESC setting parameters to the factory
default settings.
■41 Current Voltage
You can check the present battery voltage when the
program is connected.
■42 Current Temp
You can check the present ESC’s temperature when the
program is connected.
■43 Max Temperature
You can check the max temperature that is obtained
during racing when the program is connected.
■44 Motor Temp
You can check the present motor’s temperature when the
program is connected
■45 Motor Max Temp
You can check the max temperature of the motor that is
obtained during racing when the program is connected.
■46 Max Current
You can check the max current that is obtained during
racing when the program is connected.
■47 Maximum Speed
This is to confirm the max speed that is obtained at racing
of the car.
■48 Maximum RPM
This is to confirm the max RPM of the motor that is obtained
at racing of the car.
■49 Error History
(R) signal problem of the receiver.
(V) this is to indicate the ESC stops due to low voltage.
(S) Sensor problem.
(T1) this is to indicate the ESC stops due to the temperature
issue on the ESC.
(M) Motor connection problem / motor problem / product
damage
(T2) this is to indicate the ESC stops due to the temperature
issue on the motor.
10.LED status for the error
■RED LED blinks one time repeatedly mean that there is no receiver signal. Please check the connection part of
transmitter/receiver.
■RED LED blinks two times repeatedly mean that low voltage cut is activated.
■RED LED blinks three times repeatedly mean that motor sensor has a problem. Please check the sensor cable
connection and motor status.
■RED LED blinks four times repeatedly mean that temperature protection of ESC is activated.
■RED LED blinks five times repeatedly mean that there is PWM output but the motor isn’t running for more than 2
seconds. Please check the motor status or check the car.
■RED LED blinks six times repeatedly mean that temperature protection of motor is activated.
11.Data check
You can check the maximum temperature/current/speed/rpm of ESC and MOTOR through a program box or WiFi
module.
When using the program box, the ESC should not be powered off after racing and the program box should be
connected to the connection port to check the data. Data are deleted if the ESC is powered off.
Yokomo Ltd
Address: 5-23-7 Ayase, Adachi-ku Tokyo, 120-005, Japan
Tel : [phone]
Web: http://www.teamyokomo.com