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Full feature description 

All the settings are set independently for “SEMI” and “AUTO” selector positions, except for Li

-Po 

alarm and Master reset, which work for both selector positions. 

Video manual is available here:

 

https://youtu.be/OxTmKhq7bs8

 

Function and 

LED color

 

Description

 

Firing mode

 

 

Green 

Choose one of the firing modes for any selector position: safe, semi, 2-5 shot burst 
and, auto. 
 
No sound signal, steady green light 

 safe 

1 short single signal and blink 

 semi 

2-5 short signals and blinks 

 2-5 round burst 

1 long signal and blink - auto 

AB

 

 

Blue 

Active  brake  (AB)  stops  the  motor  after  the  shot,  preventing  the  spring  from 
remaining in a compressed state and eliminates double shots on semi in replicas with 

high  rate  of  fire  (“overspin”). 

5  levels  of  braking  strength  are  available 

  from  1 

(weakest braking) to 5 (the strongest). Braking can be also completely disabled. It is 
advised not to use braking all the time, if not necessary, or to use it on the lowest 
possible  level,  because  strong  braking  negatively  impacts  the  service  life  of  motor 
brushes and causes increased heating. 

Tip: 

Switch to semi, fire a single shot and hold the trigger after the shot. This will cause 

a second single shot with the strongest AB setting to be fired after 2 seconds, making 
sure the main spring remains uncompressed. It is advised to do that when you finish 
shooting for the day. 

 
No sound signal while LED glows blue means, that the active brake is disabled. 1 to 5 
signals indicate braking levels from 1 (the weakest) to 5 (the strongest). 

 

Attention!

 While precocking is on, the AB setting becomes irrelevant. However, any 

programmed AB setting will be stored in memory and will become effective as soon as 
precocking is disabled.

  

Precocking

 

 

Yellow 

When shooting on semi, precocking keeps the piston in the rear position, ready for 
the  shot. This  decreases  the  time  between  pulling  the  trigger  and  the  actual  shot, 
increasing realism, and giving an advantage in CQB fights. Precocking level must be 
set individually to each replica and according to user preferences. Precocking power 
is automatically adjusted to battery voltage and semi or automatic shots. 

Tip: 

To release the spring after using precocking, switch to semi, fire a single shot, and 

hold the trigger after the shot. This will cause a second single shot with the strongest 
AB setting to be fired after 2 seconds, making sure your spring remains uncompressed. 
It is advised to do that when you finish shooting for the day. 

 
No sound signal while LED glows yellow means, that the precocking is disabled. 1 to 8 
signals indicate precocking levels from 1 (the weakest) to 8 (the strongest). 

Attention!

 The AB setting does not affect the functioning of precocking, it is ignored if 

precocking is enabled.

 

Binary trigger

 

 

Purple and 
teal blinking 
alternately 

The binary trigger allows the semi shots to be triggered not only after the pull but also 
after the release of the trigger. 

Tip: 

Hold the trigger for 2 seconds to cancel the second shot. 

 
No sound signal while LED blinks purple and teal alternatively means, that the binary 
trigger is disabled. 1 signal indicates activation of the binary trigger. 

Summary of Contents for ETU++

Page 1: ...rent battery types Reading this manual will help you fully exploit this unit s potential and in case of encountering any problems you can look here for solutions Manufacturer Perun Barwicka 8 St 60 192 Poznań Poland e mail info perunairsoft pl Table of contents 1 Technical data 2 2 Features and programming 2 3 Factory settings 4 4 Diagnostic system 5 5 Switch check 7 6 Custom DIY projects 7 ...

Page 2: ...e of a short circuit or when a gearbox jam is detected The fuse does not wear out or need to be replaced Battery connector type Perun ETU comes with an already soldered T Plug connector Power consumption when idle Don t leave the battery connected to the replica when you are not using it When idle battery connected replica not shooting ETU consumes 0 75mA To put it in context this would drain a ha...

Page 3: ...cate braking levels from 1 the weakest to 5 the strongest Attention While precocking is on the AB setting becomes irrelevant However any programmed AB setting will be stored in memory and will become effective as soon as precocking is disabled Precocking Yellow When shooting on semi precocking keeps the piston in the rear position ready for the shot This decreases the time between pulling the trig...

Page 4: ...s disabled 1 to 5 signals indicate interval levels from 1 the shortest to 5 the longest Li Po and Li Ion alarm Teal Li Po and Li Ion alarm informs the user that battery voltage has fallen below 3 7V per cell at which the battery should not be further used and must be recharged The unit automatically detects the number of cells in the battery and determines a safe voltage range The need for battery...

Page 5: ...The unit will start functioning normally after the battery is reconnected unless there still is a short circuit that will be detected at the next start up Trigger pull detected during start up Yellow and purple blinking alternately The unit detected that the trigger was being held during start up This can also indicate a short circuit of the signal wiring or mechanical malfunction of the trigger m...

Page 6: ...erably with a T deans socket made by a different manufacturer Battery and or the motor heat up very much The battery has a too low capacity mAh and or the C parameter Use a battery with higher capacity and or the C parameter The motor is too weak Use a stronger motor possibly with neodymium magnets Increased motor load caused by excessive friction for example caused by improper shimming motor posi...

Page 7: ...or gear Green The sector gear switch was closed Checking the trigger and selector sensor can be done by simply pulling the trigger or switching the selector between SEMI and AUTO positions This can be done without any disassembly of the replica In order to check the sector gear switch it s best to open the gearbox and remove everything out of it except for the switches and the sector gear make sur...

Page 8: ...wide variety of models Therefore use any switches that will best suit your project Here is a short description of what does ETU expect from each of the switches Selector When the switch is closed ETU sees it as AUTO and when it s open it sees SEMI This is pretty much irrelevant however as the firing modes in ETU are freely programmable Please note that the safe mode can only be achieved either by ...

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