Hobbywing JUSTOCK SPEC Race ESC User Manual

USER MANUAL OF JUSTOCK CLUB SPEC ESC HW-SM501ENG-20120702 Page 1 of 3

Model

JUSTOCK CLUB SPEC

Cont./ Burst Current

45A/260A

Suitable Car

1/10, 1/12 on-road & off-road

CLUB competition and normal training

Suitable Motor

Sensored and sensorless brushless motors

Motor
Turns

4-6cells NiMH or 2S Lipo

≥8.5T (1/10 on-road), ≥11.5T (1/10 off-road)

8-9cells NiMH or 3S Lipo

≥13.5T (1/10 on-road), ≥17.5T (1/10 off-road)

Resistance

0.0006 ohm

Battery

4-9 cells NiMH or 2-3 cells Lipo

BEC Output

6V@2A, Built-in BEC (Switching mode DC-DC regulator)

Dimension

33mm(L) * 28mm(W) * 31.5mm(H) (Cooling fan included)

Weight

59g (Cooling fan NOT included)

Cooling Fan Working Voltage

5V@0.16A (The fan gets its power supply from the built-in BEC)

A) Switch off the ESC, turn on the

transmitter, set the direction of throttle
channel to ”REV”, set the throttle trim to
“0”, set the “EPA/ATV” value of throttle
channel to “100%”, and disable the ABS
function of your transmitter.

B) Use a pen or screw driver to hold the

“SET” key and then switch on the ESC,
and release the “SET” key as soon as
possible when the red LED begins to
flash.

(Refer to the picture on the right side)

C) Set the 3 points

according to the
pictures on the right
side.

► The neutral point
► The end point of

forward direction
► The end point of
backward direction

D) When the process of

calibration is finished,
the motor can be
started after 3
seconds.

【DECLARATION】
Thanks for purchasing our Electronic Speed Controller (ESC). High power system for RC model can be very
dangerous, so please read this manual carefully. In that we have no control over the correct use, installation,
application, or maintenance of our products, no liability shall be assumed nor accepted for any damages, losses
or costs resulting from the use of the product. Any claims arising from the operating, failure of malfunctioning
etc. will be denied. We assume no liability for personal injury, consequential damages resulting from our
product or our workmanship. As far as is legally permitted, the obligation to compensation is limited to the
invoice amount of the affected product.

wires freely (without any order). If the motor runs in the opposite direction, please swap any two wire connections.

Note: For SENSORLESS motor, you can also set the throttle channel of your transmitter to the “Reverse”
direction, and then the motor will run oppositely. And please calibrate the throttle range again after changing
the direction of throttle channel. Please keep in mind that this method is ONLY available for SENSORLESS
motor.

2. Throttle Range Setting (Throttle Range Calibration )

In order to make the ESC fit the throttle range, you must calibrate it when you begin to use a new ESC, or a new
transmitter, or change the settings such as the neutral position of the throttle stick, ATV or EPA parameters, etc.

【FEATURES】

 Smart and small.
 Drivers sensored and sensorless motors.
 The most advanced competition firmware with perfect control feeling.
 Timing is permanently set to zero degree (unchangeable). With the identical racing motor, each driver has the same

power system to have a real just stock racing.

 User programmable.

 3 running modes (Forward mode, Forward/Reverse mode, Rock Crawler mode)
 4 steps of maximum reverse force adjustment.
 Proportional ABS brake function with 4 steps of maximum brake force adjustment, 8 steps of drag-brake force

adjustment and 4 steps of initial brake force adjustment.

 9 start modes (Also called “Punch”) from “very soft (Level 1)” to “very aggressive (Level 9)”.
 Multiple protection features: Low voltage cut-off protection / Over-heat protection / Throttle signal loss protection /

Otherwise the ESC cannot work properly.
There are 3 points need to be set, they are the “Top point of forward”, the “Top point of backward” and the “Neutral point”.
The following pictures show how to set the throttle range with a FutabaTM transmitter.

Motor blocked protection.

 Firmware updatable, but always with zero timing.
 Budget friendly. The cheap price makes a CLUB racing more popular and easier.

【SPECIFICATIONS】

【BEGIN TO USE THE NEW ESC】

1. Connect the ESC, motor, receiver, battery
and servo correctly.

a) Sensored brushless motor wiring

When using brushless motor with Hall
Sensor， it is necessary to connect the
sensor cable to the “SENSOR” socket on
the ESC, and ESC can automatically identify
the motor type (sensored or sensorless) by
detecting the signal coming from the
SENSOR socket.

WARNING! For sensored brushless
motor, the #A, #B, #C wires of the ESC
MUST be connected with the motor wire
#A, #B, #C respectively. Do not change
the wires sequence optionally!

b) Sensorless brushless motor wiring

When using brushless motor without Hall Sensor, the #A, #B, #C wires of the ESC can be connected with the motor

3. The LED Status In Normal Running

► Normally, if the throttle stick is in the neutral range, neither the red LED nor the green LED lights.
► The red LED lights when the car is running forward or backward and it will flash quickly when the car is braking.
► The green LED lights when the throttle stick is moved to the top point of the forward zone.

【ALERT TONES】

1. Input voltage abnormal alert tone: The ESC begins to check the input voltage when power on, if the voltage is out of
the normal range, such an alert tone will be heard: “beep-beep-, beep-beep-, beep-beep-” (There is 1 second interval
between every “beep-beep-” tone).

2. Throttle signal abnormal alert tone: When the ESC can’t detect the normal throttle signal, such an alert tone will be
heard: “beep-, beep-, beep-” (There is 2 seconds interval between every “beep-” tone).

USER MANUAL OF JUSTOCK CLUB SPEC ESC HW-SM501ENG-20120702 Page 2 of 3

Trouble Possible Reason Solution

The connections of battery pack
are not correct

Check the power connections, replace the
connectors or switch

The switch is damaged

After power on, the red LED lights, but
motor cannot run

Throttle signal is abnormal

Check the transmitter and the receiver, and
check the signal wire connection of your ESC

1) The wire connections between
the ESC and the motor need to be
changed

2) The chassis is not suitable for
this ESC

The red LED flashes means Low voltage
protection, please replace the battery pack

The green LED flashes means Over-heat
protection, please wait for some minutes to
cool the ESC

1) The battery has a bad discharge
performance

1) Use a better battery

2) The gear rate is too aggressive
so the motor load is too heavy

2) Use lower KV motor or change the gear
rate or set the "Start Mode" more softly

1) Check the connection of Hall sensor cable
to make it firmly connecting the motor with
the ESC

2) The Hall sensors in the motor are
damaged, please change the motor

The motor trembles but cannot start
smoothly

1) The connctions are not A-A, B-B
and C-C

2) The ESC is damaged

1) Check the connections

2)Contact the dealer for after-sales service

After power on, motor doesn’t work, no
sound is emitted

After power on, motor can’ t work, but
emits “ beep-beep-, beep-beep-” alert
tone. (Every “ beep-beep-” has a time
interval of 1 second )

Input voltage is abnormal, too high
or too low

When the throttle stick locates in the
neutral range, the red LED and the
green LED flashes synchronously

The motor is a sensored motor, but
the ESC detects abnormal signal
from the sensor, so it changes to
sensorless mode automatically

Check the voltage of the battery pack

The motor runs in the opposite
direction

1) Swap any two wire connections between
the ESC and the motor. (Note: This method is
ONLY available for SENSORLESS motor )

2) Please don't use the ESC for this special
chassis

When accelerating quickly, the motor
stops or trembles

The motor stops running while in
working state

The ESC has entered the “ Low
voltage protection mode ” or the “

Over-heat protection mode”

1 2 3 4 5 6 7 8 9

1. Running Mode

Forward

with Brake

Forward/Reverse

with Brake

Foward/Reverse

(For Rock Crawler)

2.Drag Brake Force 0% 5% 10% 20% 40% 60% 80% 100%

3.Low Voltage
Cut-Off Threshold

Non-Protection 2.6V/Cell 2.8V/Cell

3.0V
/Cell

3.2V

/Cell

3.4V
/Cell

4.Start Mode(Punch) Level1 Level2 Level3 Level4 Level5 Level6 Level7 Level8 Level9

5.Max Brake Force 25% 50% 75% 100%

6.Max Reverse Force 25% 50% 75% 100%

7.Initial Brake Force

= Drag Brake

Force

0% 20% 40%

8.Neutral Range 6% (Narrow) 9% (Normal) 12% (Wide)

9.Timing

10.Over-heat Protection Enable Disable

Permanently set to 0 degree, unchangeable

Programmable

Items

Programmable Value

Basic Items

Advanced Items

【TROUBLE SHOOTING】

mode is suitable for competition; “Forward/Reverse with Brake” mode provides backward function, which is
suitable for daily training.
Note: “Forward/Reverse with Brake” mode uses “Double-click” method to make the car go backward.
When you move the throttle stick from forward zone to backward zone for the first time (The 1st “click”), the ESC
begins to brake the motor, the motor speeds down but it is still running, not completely stopped, so the backward
action is NOT happened immediately. When the throttle stick is moved to the backward zone again (The 2nd “click”),
if the motor speed is slowed down to zero (i.e. stopped), the backward action will happen. The “Double-Click”
method can prevent mistakenly reversing action when the brake function is frequently used in steering.
By the way, in the process of braking or reversing, if the throttle stick is moved to forward zone, the motor will run
forward at once.
“Forward/Reverse” mode uses “Single-click” method to make the car go backward. When you move the
throttle stick from forward zone to backward zone, the car will go backward immediately. This mode is usually used
for the Rock Crawler.

2.2. Drag Brake Force: Set the amount of drag brake applied at neutral throttle to simulate the slight braking effect of a
neutral brushed motor while coasting.

2.3. Low Voltage Cut-Off: The function mainly prevents the lithium battery pack from over discharging. The ESC
detects the battery’s voltage at any time, if the voltage is lower than the threshold for 2 seconds, the output power
will be reduced 70%, after 10 seconds the output power will be completely shut off and the red LED flashes in such
a way: “☆-☆-, ☆-☆-, ☆-☆-”. Please stop your car at the track side as soon as possible to avoid obstructing other
racing cars. For STOCK motors, the 3.4V/Cell cut-off threshold is suggested.
Please note that the cutoff threshold is basically calculated for each LITHIUM (Lipo) battery cell, so for NiMH
battery packs, if the voltage of the whole NiMH battery pack is higher than 9.0V, it will be considered as a 3 cells
lithium battery pack; If it is lower than 9.0V, it will be considered as a 2 cells lithium battery pack. For example, a
NiMH battery pack is 8.0V, and the threshold is set to 2.6V/Cell, so it will be considered as a 2 cells lithium battery
pack, and the low-voltage cut-off threshold for this NiMH battery pack is 2.6*2=5.2V.
There are 6 preset options for this programmable item. You can customize the cutoff threshold by using an
advanced LCD Program Box (Optional equipment) to trim it with a step of 0.1V, so it will be suitable for all kinds of
batteries (NiMH, NiCd, Li-ion, Lipo, LFP, etc).

【PROGRAM THE ESC】

1. Programmable Items List (The italics texts in the form are the default settings)

2.4. Start Mode (Also called “Punch”): Select from “Level1” to “Level9” as your like, Level1 has a very soft start
effect, while level9 has a very aggressive start effect. From Level1 to Level9, the start force is increasing. If you
choose “Level7” to “Level9”, you must use good quality battery with powerful discharge ability, otherwise you
cannot get the burst start effect as you want. If the motor cannot run smoothly (the motor is trembling), it may
caused by the weak discharge ability of the battery pack, please choose a better battery or increase the gear rate.

2.5. Maximum Brake Force: The ESC provides proportional brake function. The brake force is related to the position
of the throttle stick. Maximum brake force refers to the force when the throttle stick is located at the top point of the
backward zone. A very large brake force can shorten the brake time, but it may damage the gears.

2.6. Maximum Reverse Force: Sets how much power will be applied in the reverse direction. Different value makes
different reverse speed.

2.7. Initial Brake Force: It is also called “minimum brake force”, and it refers to the force when the throttle stick is
located at the initial position of the backward zone. The default value is equal to the drag brake force, so the brake
effect can be very smoothly.

2.8. Throttle Neutral Range:
Please refer to the following
picture to adjust the neutral
range as your like.

2.9. Timing: The “timing” item is
disabled for JUSTOCK
CLUB SPEC ESC. It is
permanently set to 0
degree.

2. Explanation For Each Programmable Item

2.1. Running Mode: With “Forward with Brake” mode, the car can go forward and brake, but cannot go backward, this

2.10. Over-Heat Protection: If
the function is activated, the
output power will be cut-off
when the temperature of the ESC or the internal temperature of the sensored brushless motor is up to a
factory-preset value for 5 seconds. When the protection happens, the Green LED will flash.

When the ESC is over-heat: The Green LED flashes as “☆-, ☆-, ☆-” (Single flash).
When the motor is over-heat: The Green LED flashes as “☆-☆-, ☆-☆-, ☆-☆-” (Double flash).

Note: The motor over-heat protection function is only available for the sensored brushless motor made by the
same manufacturer of the ESC. For motors made by other manufacturers, this function maybe not available or the