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Thank you for purchasing the ONYX electronic speed controller 
(ESC). Operating RC models can be very dangerous, so please 
read this manual carefully.

Please read and understand all warnings before installation 
and operation!

 

OPERATIONAL WARNINGS!

   

ALWAYS 

disconnect the battery from the ESC immediately if 

the ESC or battery becomes hot!! Allow the ESC or battery to 
cool down before reconnecting.

  

NEVER

 use more than the specifi ed voltage on the ESC’s 

input.

  

ALWAYS

 mount the ESC in a position where free air can fl ow 

through the heat sink during operation.

  

ALWAYS

 turn on the transmitter before connecting the battery 

to the ESC.

 

 ALWAYS

 disconnect the battery from the ESC when not in use.

  

ALWAYS

 remove the pinion gear when making programming 

changes. This will prevent the model from taking off accidentally.

  

DO NOT

 use with brushed motors.

  

ALWAYS

 activate the LVC when using a LiPo Battery. We 

recommend a minimum of 3.2V per cell.

  

ALWAYS

 use heat-shrink tubing to insulate any bare wires to 

prevent a short circuit.

   

ALWAYS 

allow the ESC to cool before touching. It is normal for 

ESCs to get warm during operation.

  

ALWAYS

 unplug the cooling fan if you are using the ESC in wet 

conditions.

  

DO NOT

 allow metal/conductive materials to accidentally 

make contact across any or all motor/battery posts.

  

NEVER

 power up the ESC before plugging it into the receiver 

(Rx) and switching on the transmitter (Tx).

   

ALWAYS 

keep out of reach of children.

  

ONYX is not responsible for incidental damage or personal 
injury as a result of misuse of this product.

 

LITHIUM BATTERY CAUTIONS!

This product may use a lithium polymer (LiPo) battery. 
Improper handling could result in FIRE! A lithium battery 
fi re has the potential to ignite surrounding areas and 
may cause property damage or cause personal injury.

  

ALWAYS

 set the LVC to a minimum of 

3.2V

 per cell to prevent 

over discharging.

  

NEVER

 leave a LiPo battery unattended while charging or 

during operation.

  

NEVER

 operate a vehicle with a LiPo battery inside a building.

 

 IMPORTANT!

 Always unplug the LiPo battery immediately 

after you’ve fi nished operating your vehicle.

  

ALWAYS

 charge and store LiPo batteries in a fi reproof location. 

Never

 store LiPo batteries inside the model.

  

If you ever see a LiPo battery puff or smoke during operation, 
immediately disconnect the battery and move the entire model, 
with the battery installed, to a fi reproof location (outside if possible).

  

Consult the battery and charger instruction manuals for 
additional safety and handling precautions.

FEATURES

  

Designed for sensorless brushless motors.

  

Includes Forward with Brake mode and Forward with Brake/
Reverse mode.

  

Water and dustproof. The ESC is resistant to splashes and brief 
underwater use. 

(Note: If the cooling fan is equipped, please 

remove it if running near water. After running, please clean 
and dry the ESC to prevent corrosion).

  

Smooth acceleration and linear feel.

  

Adjustable drag and maximum brake force.

  

Adjustable “punch” setting from soft to aggressive.

  

Safety features: Low voltage cut-off protection for LiPo or 
NiMH batteries, Thermal protection, Signal loss protection, 
Motor overload protection.

  

Easily to program using the “SET” button on the ESC.

  

Auto-select cell count.

150A /950A

Continuous / Burst

0.00035 ohm

Resistance

1/8 SCT, Buggy, Monster Truck

Scale

≤ 3000 Kv m otor

≤ 2400 Kv m otor

4S LiPo/
8 cell NIMH

6S LiPo/
18 cell NIMH

Included 5V (BEC-powered)

Cooling Fan

Motor Limit 

8-14 cell NiMH or 4-6S LiPo

Battery

SPECIFICATIONS

ONXM1250

ESC SETUP AND OPERATION

1. CONNECT THE ESC.

A.  Connect the ESC to the motor in any order. If the motor 

rotates the wrong direction, swap any two of the three wires.

B.  Connect the ESC’s Rx lead to the throttle channel of the 

receiver (typically CH2)

C.  Connect the “

+

” and “

” wires of the ESC to the battery pack.

2. THROTTLE CALIBRATION

In order to match the ESC to your transmitter, you must calibrate 
it to match the trigger throw. To do this, there are 3 points that 
need to be set: neutral, full throttle and full brake.

150A ESC

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