Skyartec ESC User Manual

Page 2

Manual of Sensorless Brushless Motor Speed Controller

- 2 -

Receiver

Red

Black

Power -

Power +

Connect with balance

charge connector on

battery pack

brushless

motor

Wiring Diagram:

ESC

TTE

GUARD-25A

Electronic Speed Controller

BRUSHLESS MOTOR

Lithium Battery Balance Discharge Monitoring and Protection (BDMP) Adapter For the “Guard” Series ESC:

We provide 2 kinds of Lithium Battery Balance Discharge Monitoring and Protection (BDMP) Adapters for user to choose.
Adapter #1 Adapter #2

VERY IMPORTANT! You MUST connect the BDMP adapter with the balance charge connector on battery pack BEFORE
connecting the main power lead to ESC. And if you use banana-shape connectors on main power wires (Input wires), please
connect the black wire (negative polarity) BEFORE red wire (positive polarity). So the right sequence is:
BDMP Adapter → BLACK wire of main power → RED wire of main power

Feature Explanation:

Brake Settings：Enabled / Disabled, default is Disabled

Battery Type：Li-xx(Li-ion or Li-Poly) / Ni-xx(NiMH or NiCd)，default is Li-xx.

Low Voltage Protection Mode(Cut-Off Mode)： Soft Cut-Off (Gradually reduces the output power) or Cut-Off (Immediately stops
output power). Default is Soft Cut-Off.

Low Voltage Protection Threshold(Cut-Off Threshold)：Low / Medium / High, default is Medium.

When NOT using balance discharge monitoring and protection function (i.e. Not plugging the balance charge connector
into the BDMP socket on the Guard series ESC, the ESC only monitors the voltage of the whole battery pack )

For lithium batteries, the number of battery cells is calculated automatically. Low / medium / high cutoff voltage for each
cell is: 2.6V/2.85V/3.1V. For example: For a 3 cell lithium pack, when medium cutoff voltage is set, the cut-off voltage will
be: 2.85*3=8.55V.

For nickel batteries, low / medium / high cutoff voltages are 0%/45%/60% of the startup voltage (i.e. the initial voltage of
battery pack), and 0% means low voltage cut-off function is disabled. For example: For a 10 cell NiMH battery, fully
charged voltage is 1.44*10=14.4V, when “medium” cut-off voltage is set, the cut-off voltage will be:14.4*45%=6.5V。

When using balance discharge monitoring and protection function (i.e. Plugging the balance charge connector on battery
pack into the BDMP socket on the Guard series ESC, the ESC monitors not only the voltage of the whole battery pack but also
the voltage of each cell). For lithium battery，low / medium / high cut off voltage for each cell is: 2.6V/2.85V/3.1V. When the
voltage of any cell in battery pack is lower than the cut-off threshold, the protection function is activated.

Startup Mode：Normal /Soft /Super-Soft, default is Normal.

Normal is preferred for fixed-wing aircraft. Soft or Super-soft are preferred for helicopters. The initial acceleration of the Soft and
Super-Soft modes are slower in comparison, usually taking 1 second for Soft startup or 2 seconds for Super-Soft startup from initial
throttle advance to full throttle. If the throttle is closed (throttle stick moved to bottom) and opened again (throttle stick moved to top)
within 3 seconds of the initial startup, the restart-up will be temporarily changed to normal mode to get rid of the chances of a crash
caused by slow throttle response in aerobatic flight.

Timing：Low / Medium / High, default is Low.

Usually, low timing can be used for most motors. But for high efficiency, we recommend the Low timing for 2 poles motor and Medium
timing for 6 poles and above. For higher speed, High timing can be chosen.

Important! After changing the timing setting, please test your RC model on ground prior to flight!

Special Note

Some high KV out-runner motors have very special construction, the space between each magnet is very large, and many ESCs can’t
drive these motors. After much testing, our ESCs have proven to work very well with these types of motors. Some RC enthusiasts still have
several questions about the programming value for these special motors. Therefore, we have provided some suggestions as follows:

Programmable Value Suggestion

Motor

Timing Startup

Mode

Generic in-runner motor

Low

Generic out-runner motor

Low or Medium

Align 420LF (Made in TAIWAN, out-runner)

High (MUST)

Usually, aircraft use “normal” startup mode
and helicopter use “super-soft” startup mode

450TH (Made in TAIWAN, out-runner)

Low

Soft (MUST)

Begin To Use Your New ESC
Please start the ESC in the following sequences:
1.

Move the throttle stick to the bottom position and then switch on the transmitter.

Connect the battery pack to the ESC, the ESC begins the self-test process, a special tone “ 123” is emitted, which means the

voltage of the battery pack is in normal range, and then N “beep” tones will be emitted, means the number of lithium battery cells.
Finally a long “beep------” tone will be emitted, which means self-test is OK, the aircraft/helicopter is ready to go flying.

If nothing is happened, please check the battery pack and all the connections;