Hobbywing SkyWalker-20A User Manual
User Manual of Brushless Speed Controller HW-SM003DUL-20130709
Thanks for purchasing our Electronic Speed Controller (ESC). High power system for RC model is very dangerous, 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 or malfunctioning etc. will be denied. We assume no liability for personal injury, property
damage or 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.
Specifications ˄Note: The Skywalker-6A,12A, 12AE, 30A, 50A, 60A and 80A are only used for RTF applications˅
Model
Skywalker-6A 6A 8A Linear 5V/0.8A 3 servos 2S 5-6 cells 5.5g 32*12*4.5
Skywalker-12A 12A 15A Linear 5V/1A 3 servos 2 servos 2-3S 5-9 cells 9g 38*18*6
Skywalker-12AE 12A 15A Linear 5V/2A 5 servos 4 servos 2-3S 5-9 cells 10g 38*18*7
Skywalker-20A 20A 25A Linear 5V/2A 5 servos 4 servos 2-3S 5-9 cells 19g 42*25*8
Skywalker-30A 30A 40A Linear 5V/2A 5 servos 4 servos 2-3S 5-9 cells 37g 68*25*8
Skywalker-40A 40A 55A Linear 5V/3A 5 servos 4 servos 2-3S 5-9 cells 39g 68*25*8
Skywalker-40A-UBEC 40A 55A Switch 5V/3A 5 servos 5 servos 5 servos 2-4S 5-12 cells 43g 65*25*12
Skywalker-50A-UBEC 50A 65A Switch 5V/3A 5 servos 5 servos 5 servos 2-4S 5-12 cells 43g 65*25*12
Skywalker-60A-UBEC 60A 80A Switch 5V/5A 8 servos 8 servos 6 servos 6 servos 2-6S 5-18 cells 63g 77*35*14
Skywalker-60A-OPTO 60A 80A N/A N/A 2-6S 5-18 cells 60g 86*38*12
Skywalker-80A-UBEC 80A 100A Switch 5V/5A 8 servos 8 se rvos 6 servos 6 servos 2-6S 5-18 cells 82g 86*38*12
Skywalker-80A-OPTO 80A 100A N/A N/A 2-6S 5-18 cells 79g 86*38*12
Programmable Items (The option written in bold font is the default setting)
1. Brake Setting˖Enabled / Disabled
2. Battery Type˖Lipo / NiMH
3. Low Voltage Protection Mode(Cut-Off Mode)˖ Soft Cut-Off (Gradually reduce the output power) /Cut-Off (Immediately stop the
output power)
4. Low Voltage Protection Threshold(Cut-Off Threshold)˖Low / Medium / High
1) For lithium battery, the battery cell number is calculated automatically. Low / medium / high cutoff voltage for each cell is:
2.85V/3.15V/3.3V. For example: For a 3S Lipo, when ³MHGLXP´ FXWRII threshold is set, the cut-off voltage will be:
3.15*3=9.45V
2) For NiMH battery, low / medium / high cutoff voltages are 0%/50%/65% of the startup voltage (i.e. the initial voltage of
battery pack), and 0% means the low voltage cut-off function is disabled. For example: For a 6 cells NiMH battery, fully
5. Startup Mode˖Normal /Soft /Super-Soft (300ms / 1.5s / 3s)
6. Timing˖Low / Medium / High,( 3.75e/15e/26.25e)
Usually, low timing is suitable for most motors. To get higher speed, High timing value can be chosen.
Begin To Use Your New ESC
IMPORTANT! Because different transmitter has different throttle range, please calibrate throttle range before flying.
Throttle range setting
Switch on the
transmitter,
move throttle
stick to the
top position
Normal startup procedure
Move throttle stick
to bottom position
and then switch
on transmitter.
Protection Function
1. Start up failure protection: If the motor fails to start within 2 seconds of throttle application, the ESC will cut-off the output power. In this
2. Over-heat protection: When the temperature of the ESC is over about 110 Celsius degrees, the ESC will reduce the output power.
3. Throttle signal loss protection: The ESC will reduce the output power if throttle signal is lost for 1 second, further loss for 2 seconds
charged voltage is 1.44*6=8.64VZKHQ³Medium´FXW-off threshold is set, the cut-off voltage will be: 8.64*50%=4.32VDŽ
a) Normal mode is suitable for fixed-wing aircraft. Soft or Super-soft modes are suitable for helicopters. The initial acceleration of
the Soft and Super-Soft modes are slower, it takes 1.5 second for Soft startup or 3 seconds for Super-Soft startup from initial
throttle advance to full throttle. If the throttle is completely closed (throttle stick moved to bottom position) and opened again
(throttle stick moved to top position) within 3 seconds after the first startup, the re-startup will be temporarily changed to normal
mode to get rid of the chance of a crash caused by slow throttle response. This special design is suitable for aerobatic flight
when quick throttle response is needed.
Connect battery
pack to the
ESC, and wait
for about 2
seconds
case, the throttle stick MUST be moved to the bottom again to restart the motor. (Such a situation happens in the following cases: The
connection between ESC and motor is not reliable, the propeller or the motor is blocked, the gearbox is damaged, etc.)
will cause the output to be cut-off completely.
Cont.
Current
Burst
Current
(>10s)
BEC
Mode
BEC
Output
BEC Output Capability
2S Lipo 3S Lipo 4S Lipo 6S Lipo Lipo NiMH L*W*H
(Throttle range should be reset whenever a new transmitter is being used)
The ³Beep-Beep-´ tone
should be emitted,
means the top point of
throttle range has been
confirmed
Connect battery pack
to ESC, special tone
like ³ 123´ means
power supply is OK
Several ³beep-´ tones
should be emitted to
present the amount of
lithium battery cells
Move throttle stick to the
bottom position, several
³beep-´ tones should be
emitted to present the
amount of battery cells
When self-test is
finished, a long
³beep-----´ tone
should be emitted
Battery Cell
A long ³Beep-´ tone should
be emitted, means the
lowest point of throttle
range has been correctly
confirmed
Weight
Move throttle stick
upwards to go flying
Size
Page 2
Trouble Shooting
Trouble Possible Reason Action
After power on, motor does not work, no
sound is emitted
After power on, motor does not work,
such an alert tone is emitted:
³beep-beep-, beep-beep-,beep-beep-´
(Every ³beep-beep-´ has a time interval
of about 1 second)
After power on, motor does not work,
such an alert tone is emitted:
³beep-, beep-, beep- ´(Every ³beep-´ has
a time interval of about 2 seconds)
After power on, motor does not work,
such an alert tone is emitted:
³beep-, beep-, beep-´ (Every ³beep-´ has
a time interval of about 0.25 second)
After power on, motor does not work, a
special tone ³ ´ is emitted after 2
beep tone (beep-beep-)
The motor runs in the opposite direction The connection between ESC and
Program the ESC with your transmitter (4 Steps)
Note: Please make sure the throttle curve is set to 0 when the
throttle stick is at bottom position and 100% for the top position.
1. Enter program mode
2. Select programmable items
3. Set item¶s value (Programmable value)
4. Exit program mode
1. Enter program mode
1) Switch on transmitter, move throttle stick to top
position, connect the battery pack to ESC
2) Wait for 2 seconds, the motor should emit
special WRQHOLNH³EHHp-beep-´
3) Wait for another 5 seconds, special tone like
³ ´ should be emitted, which means
program mode is entered
The connection between battery
pack and ESC is not correct
Input voltage is abnormal, too high
or too low.
Throttle signal is irregular Check the receiver and transmitter
The throttle stick is not in the
bottom (lowest) position
Direction of the throttle channel is
reversed, so the ESC has entered
the program mode
the motor need to be changed.
2. Select programmable items
After entering program mode, you will hear 8 tones in a loop with
the following sequence. If you move the throttle stick to bottom
within 3 seconds after one kind of tones, this item will be selected.
1. ³EHHp´ brake (1 short tone)
2. ³EHHp-beep-´ battery type (2 short tone)
3. ³EHHp-beep-beep-´ cutoff mode (3 short tone)
4. ³EHHp-beep-beep-beep-´ cutoff threshold (4 short tone)
5. ³EHHp-----´ startup mode (1 long tone)
6. ³EHHp-----beep-´ timing (1 long 1 short)
7. ³EHHp-----beep-beep-´ set all to default (1 long 2 short)
8. ³EHHp-----beep-----´ exit (2 long tone)
NoteORQJ³EHHp-----´ VKRUW³EHHp-´
Check the power connection.
Replace the connector.
Check the voltage of battery pack
Check the cable of throttle channel
Move the throttle stick to bottom position
Set the direction of throttle channel correctly
Swap any two wire connections between ESC and
motor
3. Set item value (Programmable value)
You will hear several tones in loop. Set the value matching to a tone by moving throttle stick
to top when you hear the tone, then a VSHFLDOWRQH³ ´ emits, means the value is set
and saved. (Keeping the throttle stick at top, you will go back to Step 2 and you can select
other items; or moving the stick to bottom within 2 seconds will exit program mode directly)
Tones
Items
Brake
Battery type
Cutoff mode
Cutoff threshold
Start mode
Timing
³EHHp-´
1 short tone
Off On
Lipo
Soft-Cut Cut-Off
Low Medium High
Normal Soft Super soft
Low Medium High
³beep-beep-´
2 short tones
NiMH
³beep-beep-beep´
3 short tones
4. Exit program mode
There are 2 ways to exit
program mode:
1. In step 3, after special
WRQH ³ ´ please
move throttle stick to
the bottom position
within 2 seconds.
2. In step 2, after tone
³EHHp-----beep-----´(th
at is: The item #8),
move throttle stick to
bottom within 3
seconds.
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