User Manual

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BLHeli_S 4-in-1 ESC User Manual

1. Product Features:

--Adopted EFM8BB21F16 chip, 50MHz performance frequency

-Designed for superior performance in multirotors, and uses hardware generated motor pwm for

smooth throttle response and silent operation.

-Smaller size, lighter weight, more convenient to install

-The code supports regular 1-2ms pulse width input, as well as Oneshot125 (125-250us),

Oneshot42 (41.7-83.3us) and Multshot (5-25us). The input signal is automatically detected by the

ESC upon power up.

-All codes use damped light mode. Damped light does regenerative braking, causing very fast

motor retardation, and inherently also does active freewheeling.

-The code supports features to prevent sync loss.

There are tuneable parameters that can make the code run well even in the most demanding

situations, although default settings will work excellently in normal operating environments.

-The code also supports a beacon functionality, where the ESC will start beeping after a given

time of zero throttle. This can be very useful for finding lost crafts.

2. User Guide

1). Wire Diagram

Summary of content (5 pages)

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www.foxtechfpv.com BLHeli_S 4-in-1 ESC User Manual 1. Product Features: --Adopted EFM8BB21F16 chip, 50MHz performance frequency -Designed for superior performance in multirotors, and uses hardware generated motor pwm for smooth throttle response and silent operation. -Smaller size, lighter weight, more convenient to install -The code supports regular 1-2ms pulse width input, as well as Oneshot125 (125-250us), Oneshot42 (41.7-83.3us) and Multshot (5-25us).
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www.foxtechfpv.com 2).Beeps - Normal operation: 3).
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www.foxtechfpv.com 3. Programming parameters and instructions ** Startup power differs with different ESC. Usually, bigger ESC has bigger startup power. Dark grey cell is the default set. If error occurs during saving/re set process due to some reason, e.g power disconnected, low voltage etc, default settings will be re loaded. 1).Startup power Can be set to relative values from 0.031 to 1.5. This is the maximum power that is allowed during startup.
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www.foxtechfpv.com 5). Demag compensation Demag compensation is a feature to protect from motor stalls caused by long winding demagnetization time after commutation. The typical symptom is motor stop or stutter upon quick throttle increase, particularly when running at a low rpm. As mentioned above, setting high commutation timing normally helps, but at the cost of efficiency. Demag compensation is an alternative way of combating the issue. First of all, it detects when a demag situation occurs.
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www.foxtechfpv.com -Arming sequence: The figure below shows an example of throttle value versus time. At power on, the ESC beeps 3 beeps. When throttle signal is detected, it beeps one low tone beep. This signals the start of the arming sequence. Then, when or if throttle is zero, it beeps one high tone beep. This signals the end of the arming sequence. Also, if 100% throttle is detected during the arming sequence, the ESC starts throttle calibration.