1) Q: ESC not calibrating
A: First, check to see if you have proper battery voltage inputting into ESC. Second, check to see
if signal and ground are connected to flight controller.
*If customer does not resolve issue by now, check question #6 and #7.
2) Q: After a few flights, ESC will not arm or give audible tone?
A1: Please check for over-heating as ESCs require open-air ventilation to dissipate heat.
Over-heated ESCs can cause MOSFETs solder to melt and cause shorts in the PCB. A2: Please contact
your sales rep and create a ticket on our websites to resolve under warranty case-by-case scenario
(https://emax-usa.com/pages/warranty-support). **ESCs that have obvious signs of crash damage or abuse aside
from manufacturing defect may not be considered under warranty.
3) Q: ESC tones not syncing at the same time?
A: Re-calibrate ESCs using flight controller GUI or BLHeli Suite. You can also manually set pwm
values in µs units.
4) Q: ESC causing motor to twitch?
A1: Please check to see if there are any loose electrical conductive debris shorting components.
A2: Please check input voltage for proper levels.
A3: Motor-timing in BLHeli firmware settings is not correct. Please adjust to lower timing for
bigger/slower KV motors, and higher timing for smaller/faster KV motors. Not all motors will behave
using same settings so be mindful when adjusting motor-timing.
5) Q: My ESCs are causing my motors to desync.
A: Desyncs can be caused by number of factors. Main ones being “flight controller firmware,” “esc
hardware or software,” “bad motor.”
A1: “Flight controller firmware” - please check flight controller firmware if it is updated to
latest version. Some firmware may not have desync protection built into the code.
A2: “ESC Hardware or software” - ESC hardware may not be compatible or software may not be
compatible with flight controller firmware. Please change to appropriate firmware respectively.
A3: “Bad motor” - A defect in motor build (stator slipping on base mount) or motor winding (a short
in the coil) can cause irregular performance during flight. This can cause excessive heat to build
up in both ESC and motor. Please replace motor.
6) Q: How do I achieve proper cooling?
A: If installing factory heatsink, do not cover ESCs with excessive amount of wrap, tape, or foam.
The bullet series ESCs have built-in aluminum heatsinks to dissipate heat.
Mounting them exposed to open air is recommended.
7) Q: How do I know the MOSFETs are over-heating?
A1: After closer inspection, one can check if any blobs of melted solder is slipping out from
underneath. If this is the case, please replace ESC.
A2: “Temperature protection” is on by default in BLHeli settings. In the event of
high-temp detection, “Temperature protection” shuts off the motor to prevent pushing the ESC past
its thermal limits. We recommend leaving this ON to prevent MOSFETs from melting.
8) Q: How do I prevent ESCs from shorting on the frame?
A: Most FPV frames in the market are made of carbon fiber plates. Carbon fiber plates are
electrically conductive and may cause unwanted shorts if power leads or
open-circuits are touching bare carbon. To prevent ESCs from shorting, use electrically insulated
mounting tape or use factory supplied heat shrink to cover bare circuits.
9) Q: How do I eliminate electrical noise coming from the battery?
A: The LiPo provides huge amounts of current at once. The possibility for electrical noise is high
and can be dampened or eliminated by using .47µF capacitor.
10) Q: Where can I find a copy of Multishot firmware for: A: EMAX Lightning:
https://github.com/cleanflight/blheli-multishot/releases/tag/Multishot_14.85 EMAX Lightning_S:
https://github.com/cleanflight/blheli-multishot/releases/tag/Blheli_S_16.65
EMAX Bullet: https://github.com/cleanflight/blheli-multishot/releases/tag/Blheli_S_16.65
11) Q: Where can I find a copy of DSHOT firmware for: A: EMAX Bullet:
https://github.com/bitdump/BLHeli/tree/master/BLHeli_S%20SiLabs/Hex%20files
12) Q: Where can I find a copy of BLheli/BHeli_S Suite:
A: https://github.com/4712/BLHeliSuite/releases