<p>This has already happened to me, the problem was ESC configuration.</p>
<p>I was using a LiFe battery (3.3V/Cell) and the <code>Low Voltage Cut-Off Threshold</code> ESC configuration was about to cut the current with 3.2V/Cell. Look for the programmable settings of your ESC and check how it is.</p>

CC BY-SA 4.0
2021-05-28T13:30:18.727Z
2021-05-28T13:30:18.727Z
Arcaniaco
<p>I have a BLDC motor and a 300 amp ESC, The ESC shuts down after a few seconds at full load. The motor only draws 2 amps at full throttle, full load and the voltage only drops .5 volts. The battery is 6-s 8-p and has been tested, all cells are good My question is what is triggering the shutdown in the ESC?  I have it set at 3v per cell which would be 18v It never get's lower than 24v. Nothing gets hot, it isn't on long enough to even get warm. If it's not the LVC is there something in the ESC that tells it is drawing to much current? Could it be the back EMF is not triggering the sequence correctly?  I'm using an Arduino connected to the ESC instead of RC, Could there be anything in the code I could adjust?</p>
<pre><code>#include &lt;Servo.h&gt; //Using servo library to control ESC
Servo esc; //Creating a servo class with name as esc
void setup()
{
esc.attach(10); //Specify the esc signal pin,Here as D10
esc.writeMicroseconds(1000); //initialize the signal to 1000
Serial.begin(9600);
}
void loop()
{
int val; //Creating a variable val
val= analogRead(A0); //Read input from analog pin a0 and store in val
val= map(val, 0, 1023,1000,2000); //mapping val to minimum and maximum(Change if needed)
esc.writeMicroseconds(val); //using val as the signal to esc
</code></pre>
<ul>
<li><p><strong>Motor:</strong> SSS 56114 360KV Brushless 1/5 Motor 13.000W 56114mm for Boat, car and Surfboard Maximum Amps: 95A Max volt: 125V.</p>
</li>
<li><p><strong>ESC:</strong>  SPECS 300A BOAT ESC Flier mod. R-Snake Voltage (LiPo): 3-12S Voltage: 12V to 50V Anti-spark cable: yes Wires: 8AWG Connectors: 8mm Bullet BEC: No Size (mm): 2405735 Weight: 387g</p>
</li>
</ul>
<p>This is a custom build so there is no other info on the prop.</p>

CC BY-SA 4.0
2021-05-28T13:37:25.390Z
Some ESCs have a 'lost comms' feature which cuts the drive after a few seconds without receiving a signal. I'm not familiar with the Arduino Servo library - does the writeMicroseconds() function send the value just once, or is it repeated/continuous? In the former case, it might interpret this is a loss of signal; adding a loop might help?
Kralc
CC BY-SA 4.0
2021-05-28T17:27:26.340Z
Thank you, That sounds very possible. It runs for about 12 seconds, shuts down, but I can start it again immediately. How would I add a loop to the code?
edrummer
CC BY-SA 4.0
2021-05-29T08:00:56.947Z
A simple loop could be done with `while(true) { esc.writeMicroseconds(val); delay(100); }`.
Kralc
CC BY-SA 4.0
2021-06-28T08:04:16.493Z
@Kralc, it should loop anyway, as it's in the loop function. Adding a delay might help as servos expect a pulse every 50ms
Robin Bennett
CC BY-SA 4.0
2021-06-28T08:06:57.867Z
You could try a regular servo tester to generate the signal, to see if the problem is in the arduino or the ESC.
Robin Bennett
CC BY-SA 4.0
2021-06-28T18:46:06.410Z
Running a brushless motor unloaded at full throttle/high RPM is a bad idea as switching losses quickly build up within the ESC and can cause excessive heat. Other issues can be back-emf, timing misses (commutation loss). You wouldn't put your car in neutral and pin the throttle
Brydon Gibson
CC BY-SA 4.0
2021-11-11T07:20:12.293Z
How big are the wires between the battery and ESC? Tiny wires have large voltage losses if you measure at the ESC.
Gabriel Staples
<esc><brushless-motors>
ESC shutting down when motor loaded
edrummer
# ESC shutting down when motor loaded

(Asked by: username_0 on 2021-05-27)

I have a BLDC motor and a 300 amp ESC, The ESC shuts down after a few seconds at full load. The motor only draws 2 amps at full throttle, full load and the voltage only drops .5 volts. The battery is 6-s 8-p and has been tested, all cells are good My question is what is triggering the shutdown in the ESC?  I have it set at 3v per cell which would be 18v It never get's lower than 24v. Nothing gets hot, it isn't on long enough to even get warm. If it's not the LVC is there something in the ESC that tells it is drawing to much current? Could it be the back EMF is not triggering the sequence correctly?  I'm using an Arduino connected to the ESC instead of RC, Could there be anything in the code I could adjust?
#include  //Using servo library to control ESC
Servo esc; //Creating a servo class with name as esc
void setup()
{
esc.attach(10); //Specify the esc signal pin,Here as D10
esc.writeMicroseconds(1000); //initialize the signal to 1000
Serial.begin(9600);
}
void loop()
{
int val; //Creating a variable val
val= analogRead(A0); //Read input from analog pin a0 and store in val
val= map(val, 0, 1023,1000,2000); //mapping val to minimum and maximum(Change if needed)
esc.writeMicroseconds(val); //using val as the signal to esc


Motor: SSS 56114 360KV Brushless 1/5 Motor 13.000W 56114mm for Boat, car and Surfboard Maximum Amps: 95A Max volt: 125V.

ESC:  SPECS 300A BOAT ESC Flier mod. R-Snake Voltage (LiPo): 3-12S Voltage: 12V to 50V Anti-spark cable: yes Wires: 8AWG Connectors: 8mm Bullet BEC: No Size (mm): 2405735 Weight: 387g


This is a custom build so there is no other info on the prop.

**Tags:** esc, brushless-motors

> **Comments:**
> **username_1**: Some ESCs have a 'lost comms' feature which cuts the drive after a few seconds without receiving a signal. I'm not familiar with the Arduino Servo library - does the writeMicroseconds() function send the value just once, or is it repeated/continuous? In the former case, it might interpret this is a loss of signal; adding a loop might help?  
> **username_0**: Thank you, That sounds very possible. It runs for about 12 seconds, shuts down, but I can start it again immediately. How would I add a loop to the code?  
> **username_1**: A simple loop could be done with `while(true) { esc.writeMicroseconds(val); delay(100); }`.  
> **username_2**: @username_1, it should loop anyway, as it's in the loop function. Adding a delay might help as servos expect a pulse every 50ms  
> **username_2**: You could try a regular servo tester to generate the signal, to see if the problem is in the arduino or the ESC.  
> **username_3**: Running a brushless motor unloaded at full throttle/high RPM is a bad idea as switching losses quickly build up within the ESC and can cause excessive heat. Other issues can be back-emf, timing misses (commutation loss). You wouldn't put your car in neutral and pin the throttle  
> **username_4**: How big are the wires between the battery and ESC? Tiny wires have large voltage losses if you measure at the ESC.  

---

## 1 answers

### Answer by username_5 on 2021-05-28. Score: 1

This has already happened to me, the problem was ESC configuration.

I was using a LiFe battery (3.3V/Cell) and the `Low Voltage Cut-Off Threshold` ESC configuration was about to cut the current with 3.2V/Cell. Look for the programmable settings of your ESC and check how it is.


---

