Perun Airsoft V3 Optical User manual

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V3 Optical
Manual
Table of contents
1. Basic information ............................................................................................................ 2
2. Programming................................................................................................................... 2
2.1. Programming firing modes.............................................................................................. 3
2.2. Active brake (AB)............................................................................................................. 3
2.3. Precocking ....................................................................................................................... 4
2.4. Li-Po protection............................................................................................................... 5
2.5. Double shot ..................................................................................................................... 5
2.6. Calibration mode............................................................................................................. 5
3. Troubleshooting .............................................................................................................. 6

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1. Basic information
Perun V3 Optical allows you to replace traditional, mechanical switches in version 3
gearboxes with modern, microcontroller steered MOSFET electronic device based on optical
switches. Complete lack of moving parts provides great reliability in any situation and allows
you to be confident, that your replica will not fail you in the heat of the action. Perun V3
Optical will also enhance your weapon with lots of features it did not have before.
Warranty –1 year from the purchase date
Allowed battery voltage - 7V to 17V, which permits use of the following battery types:
Li-Po, 2 to 4 cells (7.4V to 14.8V)
NiMH/NiCd, 8 to 10 cells (9.6V to 12V)
Li-Fe, 3 to 4 cells (9.9V to 13.2V)
Perun V3 should never be run without a fuse!
Power consumption when idle: 1 mA
Do not leave your replica with the battery plugged in for a longer period of time (more than a
few days), because of the risk of complete battery discharge (which will permanently damage
the battery).
2. Programming
Video showing different features of Perun V3 Optical and explaining
how to use them is available under the link below or the QR code shown
here: https://youtu.be/Z-3x6Ax3GAg
Enter the programming mode by quickly switching the selector from
“SEMI” to “AUTO” and back twice or the other way round, from “AUTO”
to “SEMI” and back twice. In order to be able to enter the programming
mode, the selector must have been at rest for at least two seconds. Successful entering into
the programming mode is signaled by a sound signal.
Whether we enter the programming mode starting from “SEMI” or “AUTO” selector position
is relevant, if we are about to program firing mode (safe, semi, burst or auto). In case of
other settings (AB, precocking etc.), it does not matter where the selector initially was.
After entering the programming mode, the settings are being changed by pressing the
trigger correct amount of times and then saving the settings by holding the trigger until a
confirmation in a form of a sound signal can be heard.
In case of features available after 7, 8, 10, 11 and 12 trigger pulls, one long sound signal
means, that if we hold the trigger now to save the settings, the feature was disabled so far
and now will be enabled. Three short sound signals would mean the opposite –the feature
was enabled until now and after saving the settings it will be disabled. Pressing the trigger
more than 12 times and saving allows to exit programming mode without making any
changes.

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2.1. Programming firing modes
Programming firing modes –enter the programming mode for “SEMI” or “AUTO” selector
position and pull the trigger 0 to 6 times, then hold the trigger until a sound signal can be
heard to save the settings.
Perun V3 allows the mechanical trigger lock to be retained. Because of that, with selector in
“SAFE” position the replica will always remain safe (provided that the mechanical lock works
properly). On both other selector settings („SEMI” and „AUTO”) any firing mode can be set,
independently.
For example, to change firing mode for selector in “SEMI” position, quickly switch from
“SEMI” to “AUTO” and back to “SEMI” twice. Entering the programming mode will be
confirmed by a sound signal.
After entering the programming mode choose firing mode:
Safe –save changes right after entering the programming mode.
Single shot (semi) –pull the trigger once.
2-5 round burst –pull the trigger 2-5 times.
Full auto –press the trigger 6 times.
Save changes by pulling and holding the trigger until a sound signal can be heard. All the
changes will be stored in memory and valid also after disconnecting and connecting the
battery again.
2.2. Active brake (AB)
Active brake –enter programming mode for any selector position, pull the trigger 7 times,
and hold the trigger until a sound signal can be heard to save the settings.
Active break (AB) is a feature, which if enabled, stops the motor after each shot (in single fire
mode) or after the last shot of a burst. This prevents main spring from remaining
compressed and in case of replicas with lower muzzle energy and high rate of fire, prevents
the problem of unwanted double shots in single fire mode.
Note that the use of active brake makes the motor heat up faster and accelerates wear of
motor brushes. Therefore it is recommended to only keep AB on, if it is necessary. If not, it is
much better to turn it on only at the end of the day, to fire just a few shots in single fire
mode, so that the spring will remain uncompressed during storage.
While precocking is enabled, the AB setting is irrelevant.

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2.3. Precocking
Precocking –enter programming mode for any selector position, pull the trigger 8 times, and
hold the trigger until a sound signal can be heard to save the settings.
When precocking mode is enabled, the piston will remain in rear position after each shot
with spring compressed and ready to fire. This works for single fire, burst and full-auto.
With the use of optical sensor, microcontroller checks sector gear’s position and rotational
speed. In case of replicas with high rate of fire, when the trigger is released Perun V3 will not
power the motor any longer and only apply some active braking to set the piston in the right
position, not letting it to overspin. In slower configurations, it calculates what amount of
power would be just enough to set the piston in the rear position, taking into account the
momentum of the motor and gears, and transfers that amount of power to the motor. This
saves battery energy and decreases wear to motor brushes. Battery voltage and number of
shots fired before the trigger was released is also taken into account.
The process is automatic, but due to some differences between replicas, fine adjustment is
possible, by the way of precocking power feature described below.
It is recommended to turn precocking off at the end of the day and fire a few shots in single
fire mode with AB on, so that the spring will remain uncompressed during storage.
Precocking power –enter programming mode for any selector position and pull the trigger 9
times. Change the precocking power by switching the selector between “SEMI” and “AUTO”
positions. Hold the trigger until a sound signal can be heard to save the settings.
To precisely adjust the precocking power in replicas with different motors, main springs and
gears, there is a possibility to choose one of 5 precocking power levels, where the 1. is
recommended for replicas with highest rate of fire and 5. for those with lowest RPS rate.
Correct precocking power level should be individually selected for each replica through
experiment, so that both in single fire mode, as well as in full-auto the trigger will remain in
rear position. If precocking is enabled, but time between pulling the trigger and shot being
fired is too long, select a higher precocking power level. This should be done, until optimal
trigger response in achieved. Should a too high precocking power level be selected,
malfunctions like overspin may occur, or a necessity to pull the trigger twice to fire a shot. In
that case, choose lower precocking power level. In case of replicas with extremely high rate
of fire use of precocking may lead to malfunctions even at precocking level 1, especially in
full-auto firing mode. This may happen if motor’s and gear’s speed is too great, for the active
brake be able to stop them on time. In that case, we suggest to disable precocking and turn
AB on instead, since the trigger response will be quick anyway.

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2.4. Li-Po protection
Li-Po protection –enter programming mode for any selector position, pull the trigger 10
times, and hold the trigger until a sound signal can be heard to save the settings.
Batteries should never be discharged below certain level. Perun V3 offers a feature which
warns its user that his Li-Po battery is almost completely discharged and should be changed.
With Li-Po protection enabled, Perun will automatically detect number of Li-Po cells in
connected battery and if voltage for that number of will drop below safe limits, short sound
signals will be heard every 30 seconds.
2.5. Double shot
Double shot –enter programming mode for any selector position, pull the trigger 11 times,
and hold the trigger until a sound signal can be heard to save the settings.
When double shot feature is enabled, if single fire mode is used, shots will be fired both
after the trigger has been pulled and relased.
2.6. Calibration mode
Calibration mode - enter programming mode for any selector position, pull the trigger 12
times, and hold the trigger until a sound signal can be heard to save the settings.
Enabling this function will make Perun V3 enter calibration mode at next start-up. This
feature is meant mainly for technicians and more information about it can be found in
installation manual.

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3. Troubleshooting
Problem
Possible cause
Solution
Perun V3 cannot pass
the calibration
procedure
successfully (a long
sound signal is heard
at the end of
procedure and
calibration is initiated
at next start-up).
Improper selector
sticker position.
Change selector sticker position.
Loose selector lever (in
AK replicas).
Remove any slack, so that even slight selector
lever movement will result in selector plate
movement.
Selector plate sensor
malfunction.
Send Perun V3 back for repair.
Perun V3 does not
detect any difference
between „SEMI” and
„AUTO” selector
positions.
Selector plate sensor
needs to be calibrated.
Enable calibration procedure at next start-up the
following way:
1) remove gearbox from the body,
2) connect the motor, so that sound signals can
be heard; fasten the motor to a heavy object,
so that it will not jump around in case a signal
to fire was received by Perun V3,
3) plug-in the battery,
4) enter the programming mode by touching the
selector plate sensor and pulling it away
twice,
5) pull the trigger 12 times and save the setting,
so that at next start-up Perun V3 will enter
calibration mode,
6) disconnect the battery and motor,
7) put gearbox back in body, put back pins and
screw the pistol grip,
8) connect the motor,
pass the calibration procedure.
Loose selector lever (in
AK replicas).
Remove any slack, so that even slight selector
lever movement will result in selector plate
movement.
Selector plate sensor
malfunction.
Send Perun V3 back for repair.
Semi-automatic fire
does not work
(replica only fires
bursts or fully
automatic).
Burst has been
programmed on
„SEMI” selector
position.
Program semi-automatic fire on „SEMI”.
Sector gear optical
sensor and/or sector
gear LED diode are
covered with grease.
Remove grease from optical sensor and diode.
Sector gear optical
sensor and/or sector
gear LED diode are
damaged.
Send Perun V3 back for repair.

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Problem
Possible cause
Solution
Perun V3 emits sound
signals right after the
battery has been
plugged in, which
means that
protection against
accidental firing and
start-up was
triggered. It enables if
Perun V3 will detect
trigger to be pressed
at start-up
Trigger was held during
the start-up.
Release the trigger, replica will start to function
normally.
Trigger sensor needs
calibration.
Enable calibration procedure at next start-up the
following way:
1) disassemble gearbox and remove Perun V3
from it,
2) connect the motor, so that sound signals can
be heard; fasten the motor to a heavy object,
so that it will not jump around in case a signal
to fire was received by Perun V3,
3) place a large piece of plastic between trigger
optical sensor and trigger diode,
4) plug-in the battery,
5) enter the programming mode by touching the
selector plate sensor and pulling it away
twice,
6) simulate pulling the trigger 12 times by
removing the piece of plastic from between
the trigger sensor and diode and putting it
back, then save the settings by removing the
piece of plastic for a longer time, so that at
next start-up Perun V3 will enter calibration
mode,
7) disconnect the battery and motor,
8) put gearbox back in body, put back pins and
screw the pistol grip,
9) connect the motor,
10) go through the calibration procedure.
Replica fires a 2-
round burst in semi-
auto mode.
Motor and battery are
too strong for the main
spring, which causes
overspin.
Enable AB or precocking.
Perun V3 will not
shoot or emit any
sounds.
Blown fuse.
Check what was the reason the fuse had blown. In
such situation never run Perun V3 without fuse!
Disconnected motor
connector.
Squeeze the connector, so that it is tighter and
connect it back to the motor.
Incompatible battery T-
deans socket.
T-deans plugs and sockets from various
manufacturers may sometimes not work together
reliably. Although the plug may seem to fit the
socket nicely, the conductive surfaces may not
contact each other, cutting the power off. In that
case try with another battery, most preferably
with T-deans socket made by different
manufacturer.

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Problem
Possible cause
Solution
Battery and/or the
motor heat up very
much.
The battery has a too
low capacity (mAh)
and/or “C”parameter.
Use a battery with higher capacity and/or “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 positioned
askew in the pistol grip.
Remove the cause of the friction.
The same battery
and/or motor didn’t
heat up earlier.
Low-resistance MOSFET transistor and wiring used in Perun V2 provide
resistance much lower than mechanical contacts and some other MOSFET
circuits. According to Ohm’s law, that allows more current to be drawn from
the battery and directed to the motor. This makes the trigger response and
rate of fire faster, but higher current draw also leads to increased heating of
electronic elements. This may become too demanding for previous battery
and/or motor and a need to change to new ones may arise.