PowerBox Systems Royal SR2 User manual

INSTRUCTION MANUAL
10/2021
PowErBox
royAl sr2

2PowerBox-Systems − World Leaders in RC Power Supply Systems
Dear PowerBox customer,
The PowerBox Royal SR2 once again sets new technical standards, offering a con-
vincing array of features which until now have been the exclusive preserve of pro-
fessional aviation. P² servo bus, 26 channels, 12-axis gyro, two pairs of regulators
and a full-color screen - these are just a few of the technical renements which the
PowerBox Royal SR2 offers the ambitious pilot.
The PowerBox Royal SR2 is housed in a high-quality, extremely compact case with
integral aluminum heat-sink. The large cooling area dissipates the heat generated
by the four regulators, which are wired in pairs to provide energy for all 26 ser-
vos. Both regulator pairs can be set to any of four different voltages. This makes it
possible to combine standard 6V servos with high-performance HV types, without
additional regulator modules.
For the rst time all the data relating to all the model’s servos can be monitored, and
their parameters adjusted¹ from the transmitter. This development has been made
possible by the introduction of our P²-BUS protocol, whose aim was to maintain
complete control of all the components in the model. The PowerBox Royal SR2 has
four fully independent P²-BUS interfaces, which can be set to two different voltage
levels.
These interfaces can be used to connect servos with an integral P²-BUS, or conven-
tional servos with the new P²-ServoBridge. The P²-ServoBridge is an adapter which
converts the P²-BUS into a PWM signal for normal servos; it also has an integral
innitely variable electronic fuse.
This has allowed us to implement a bus system in the model which is signicantly
superior to standard PWM wiring in respect of security and performance.
All data relating to the receivers and power supply system are displayed on the
full-color screen, and all settings are available in a carefully structured, bi-lingual
menu which is easily understood.
The TFT screen is also housed in a high-quality aluminum case, and is clearly legible
even in full sunshine.
Connecting the optional iGyro SAT converts the PowerBox Royal SR2 into a 12-axis
gyro which has few equals in terms of functionality. The gyro can be set up to suit
even the most complicated of models in just a few minutes. After this, the correct
gyro gain is set from the transmitter in a test-ight using a rotary control. A whole
series of supplementary Expert settings is available to allow the pilot to ne-tune
the gyro effect to suit his unique individual preferences.
Naturally a GPS III sensor can also be connected to the PowerBox Royal SR2. This

www.powerbox-systems.com 3
unit provides automatic gyro gain adjustment in relation to airspeed.
The PowerBox Royal SR2’s 26 outputs are provided with an ample power supply,
and they can also be assigned individually to various functions. All outputs can be
allocated direct and gyro channels as well as door sequencer functions.
The PowerBox Royal SR2 has an automatic servo-matching function which is a
new development. This system makes it possible to match a maximum of three
servos to each other automatically in just a few seconds using ve points. All you
have to do is select the servos which are inter-connected mechanically, and start
the automatic procedure.
Of course, each output can also be adjusted manually using the servo-matching
function and the graphic-based menu.
The nal aspect of the system is its pair of integrated door sequencers. In addition
to a retractable undercarriage, it is possible - for example - to implement a latched
opening canopy control system without additional devices. The rst door sequen-
cer can be set up in just a few minutes with the help of a Setup Assistant, and three
modes are available.
Additional special settings are equally easy to set up thanks to the on-screen dia-
grams in which the entire timed sequence can be seen at a glance.
The PowerBox Royal SR2 can be set up and controlled virtually completely² from
PowerBox and Jeti transmitters! Telemetry for every aspect of battery and receiver
data is available for all supported systems. If a GPS III is connected to the unit, GPS
data are also available - in so far as your radio control system supports this.
² Except sequencer and setup assistant

4PowerBox-Systems − World Leaders in RC Power Supply Systems
TABLE OF CONTENTS
1. INITIAL INSTALLATION: GENERAL SEQUENCE OF OPERATIONS ...................................7
2. INSTALLATION, CONNECTIONS..........................................................................................7
3. SWITCHING ON AND OFF ..............................................................................................10
4. MAIN MENU .................................................................................................................. 12
5. GENERAL SETTINGS.....................................................................................................13
6. SETUP ASSISTENT .......................................................................................................14
7. SERVO MATCHING........................................................................................................19
8. DOORSEQUENZER.........................................................................................................23
9. OUTPUT MAPPING .......................................................................................................29
10. P² SERVOBUS................................................................................................................30
11. INPUT MAPPING........................................................................................................... 33
12. IGYRO ...........................................................................................................................34
13. GYRO SETTINGS - BEFORE THE FIRST FLIGHT.............................................................37
14. SPECIFICATION ............................................................................................................39
15. SET CONTENTS.............................................................................................................39
16. DIMENSIONS.................................................................................................................40
17. ACCESSORIES...............................................................................................................41
18. SERVICE NOTE ..............................................................................................................42
19. GUARANTEE CONDITIONS............................................................................................ 42
20. LIABILITY EXCLUSION..................................................................................................43

www.powerbox-systems.com 5
royAl sr2

6PowerBox-Systems − World Leaders in RC Power Supply Systems
FEATURES
+ 26 channels
+ High-performance battery backer with high continuous load capacity
+ Four P2-BUS outputs with full telemetry support for servos
+ 2.4” TFT-screen, legible in sunlight
+ Bi-lingual menu system
+ Consistent duplication of all power electronics
+ Redundant electronic switch
+ Servo matching for all 26 outputs
+ Auto matching function
+ Two independent door sequencers with Setup Assistant
+ The latest integrated iGyro technology, using the iGyroSAT as gyro sensor
+ Twelve independent gyro outputs for: 4x aileron, 4x elevator, 4x rudder
+ Individual gain control for all twelve gyro outputs
+ Special regulatory algorithm for xed-wing models
+ System detects all transmitter mixers
+ Four selectable output voltages: 6.0 V, 7.4 V, 7.8 V or unregulated
+ Two different voltage levels – left and right side separated adjustable
+ Graphic menu diagrams ensure ultra-simple programming
+ Fast basic setup procedure using the sophisticated Assistant
+ Optional GPS III for speed-dependent gyro compensation
+ Telemetry data for PowerBox P²BUS, Futaba S.BUS2, Jeti Ex-BUS, Spektrum
SRXL2, Multiplex M-Link, JR DMSS und Graupner HoTT
+ Transmission of battery, receiver and GPS* data
+ Virtually all features can be controlled from PowerBox and Jeti transmitters
+ Selectable servo frame rate: 10ms, 12ms, 14ms, 16ms, 18ms
+ Servo feedback current suppression
+ Latest 32-bit micro-processor for precise, high-speed signal processing
+ High-performance machined heat-sink for optimised heat diffusion
+ Machined, anodised aluminium switch and screen case
+ Compact dimensions
*with GPS III connected

www.powerbox-systems.com 7
1.INITIAL INSTALLATION: GENERAL SEQUENCE OF OPERATIONS
When installing the unit it is important to keep to the standard sequence described
below, and adhere to the subsequent setup stages, as this ensures that your ins-
tallation of the Royal SR2 will be swift and problem-free. The individual points are
explained in full in the remainder of these instructions:
- Mounting the PowerBox, switch and screen
- Connecting the receiver and batteries
- Settings in the General Settings menu
- Setting up all the functions at the transmitter
- Carrying out the Setup Assistant
- Carrying out the Door Sequencer Assistant1
- Assigning all remaining functions in Output Mapping
- Setting up all control surface travels, ight modes, Dual-Rate, Expo etc. at the
transmitter
- Using Servo Matching to equalise servos operating in parallel
- Learning the stick end-points in the iGyro menu 2
- iGyro set-up ight 2
- Fine-tuning the iGyro 2
1 not required if wheel doors are not present
2not required without a gyro
2. INSTALLATION, CONNECTIONS
a) Mounting
The PowerBox Royal SR2 should be mounted in the model on a robust sub-struc-
ture using the four screws, rubber grommets and brass eyelets supplied in the
set. The installed location is not important, but if an iGyroSAT is to be used, the
sensor must be installed perpendicular to the model’s centreline. Ideally the TFT
screen should be in a clearly visible location. The very bright screen lighting ma-
kes it easy to read even in full sunshine, so no special provisions have to be made
here. The screen is connected to the socket marked Display on the side of the
PowerBox.

8PowerBox-Systems − World Leaders in RC Power Supply Systems
The switch should be mounted in the fuselage side. As with previous units, a
wooden doubler should be glued to the inside of the switch aperture - especially
if the fuselage is made of GRP - in order to avoid subjecting the switch to pow-
erful vibration. The set includes a template for the switch aperture. An exposed
switch is often undesirable in scale models, and for such applications we offer
an alternative switch in the shape of the MagSensor. However, please note that
the SensorSwitch is required for the programming procedure - unless you are
using a Core or Jeti RC system - and for this reason it should always be available
for use. The SensorSwitch is plugged into the socket marked Switch on the side
of the PowerBox.
b) Receivers
Once you have installed the PowerBox Royal SR2, the screen and the switch, it is
time to connect the receivers. In principle all SRS PowerBox systems are totally
reliable when used with a single receiver. However, in view of the low cost of a
second receiver compared with the value of the model, we always recommend
installing a second receiver.
Ideally the receivers should be spaced well apart inside the model, as this increa-
ses the likelihood that at least one receiver will have good reception at all times
- even under difcult reception conditions. It is permissible to extend the serial
bus connection between receiver and backer to any length, as the signal is digital,
and therefore extremely resistant to external inuences.
The PowerBox Royal SR2 can be used with a wide range of radio control sys-
tems: PowerBox CORE P²BUS, Futaba S.BUS2, Jeti EX-BUS, Spektrum SRXL2,
Multiplex M-Link and Graupner Hott. The rst four systems share one common
feature: servo signals and telemetry data are carried on a bus system, and this
allows the receivers to be connected to the Royal SR2 using a single patch lead
each. Multiplex and Hott systems require an additional connection between the
telemetry output of the PowerBox and the receiver’s telemetry input.
The Royal SR2 automatically detects the system to which it is connected. Ho-
wever, when the radio is rst switched on it may take a few seconds before the
system is unambiguously recognised. Once detected, the unit stores the system
type, and it will start immediately next time it is switched on.
• PowerBox CORE
Connect one or two receivers to RX1 and RX2 at the P²BUS output. If only one
receiver is to be used, it must be connected to RX1 to provide telemetry trans-

www.powerbox-systems.com 9
mission. If a GPS III is connected to the FastTrack input, the Competition also
delivers GPS data to the transmitter.
• Jeti EX-BUS
One output of the receivers you intend to use must be set to EX-BUS. The frame
rate should be set to 10ms, and the Failsafe function must be OFF. If you intend
to use only one receiver, then it must be connected to RX1 to transmit telemetry
data. If a GPS III is connected to the FastTrack input, the Competition also deli-
vers GPS data to the transmitter. Only the REX-Type receivers are supported
• Futaba S.BUS2
Connect one or two receivers to RX1 and RX2 at the S.BUS2 output. If only one
receiver is to be used, it must be connected to RX1 to provide telemetry transmis-
sion. This receiver must also be dened as the telemetry receiver at the transmit-
ter. In order to receive telemetry data you must carry out a Load New process in
the Telemetry Sensor menu; this action completely erases the sensor list. Now
select Slot 16 in the sensor list, and select PowerBox. The telemetry data now
appear in Slot 16 or later. If a GPS III is connected to the FastTrack input, the
Competition also delivers GPS data to the transmitter.
• Spektrum SRXL 2
Connect one or two SPM4651T satellites to the Royal SR2 using the optional
adapter lead set (#9192). If only one receiver is to be used, it must be connected
to RX1 to provide telemetry transmission. At the transmitter you will now see the
battery data displayed under PowerBox Sensor. If a GPS III is connected to the
FastTrack input, the Competition also delivers GPS data to the transmitter.
By default the Competition works in DX18 compatibility mode.
• Multiplex M-Link
Set the B/D sockets of the receivers you intend to use to SRXL V2. This gives you
sixteen channels. The Failsafe function must be OFF.
To use telemetry you must disable the Telemetry function of one receiver using
Multiplex Launcher. The Tele output of the PowerBox should be connected to the
Sensor input of the other receiver.
Note: do not attempt to register the PowerBox as a sensor at the transmitter;
this function is not implemented.

10 PowerBox-Systems − World Leaders in RC Power Supply Systems
If a GPS III is connected to the FastTrack input, the Competition also delivers GPS
data to the transmitter.
• Graupner Hott
Set one output of both receivers to SUMD-OF16. For example, if the receiver is a
GR16/24, this will be output 8. Connect these outputs to the RX1 and RX2 inputs
of the PowerBox. If a GPS III is connected to the FastTrack input, the Competition
also delivers GPS data to the transmitter.
For the telemetry function you must connect the TELE output of the PowerBox to
the Telemetry input of one receiver.
c) Connecting the batteries
It is possible to use 2S LiPo, 2S LiIon, 2S LiFePo or 5S NiMH batteries with the
Royal SR2. We recommend that you use our PowerPaks, which feature integral
charge electronics. The fundamental rule regarding battery size is that one bat-
tery on its own should be capable of powering the model reliably.
If you intend to assemble your own batteries please note that correct polarity is
vitally important. The unit does not include reverse polarity protection, as this
would involve performance losses.
3. SWITCHING ON AND OFF
This is the procedure for switching the PowerBox on: hold the SET button pressed
in until the LED glows red. Continue to hold it pressed in while you also press but-
tons I and II briey to conrm the switching process. This method enables you to
switch the batteries on individually; for example, in order to check that both packs
are working properly, and deliver sufcient current when all the control surfaces
are moved.
The same procedure is used to switch off.
Note: connecting a battery to the PowerBox with incorrect polarity, even very
briey, will immediately destroy the voltage regulators!
Note: only one receiver (Bind A or Bind B) can transmit telemetry!

www.powerbox-systems.com 11
The TFT screen now displays the following image:
Analogue battery voltage display, with recorded minimum value. The momen-
tary value is indicated by the red line, while the grey line indicates the minimum
voltage which occurred during the ight. The scale of the analogue display is
automatically adjusted to suit the battery type you have selected. The supple-
mentary digital display indicates the exact value.
The two analogue markers show the current being drawn from the right and
left battery. The digital current gure shows the sum of the currents at both
inputs.
Shows the voltage present at the output.
The consumed capacity is displayed separately for both batteries. It can also
be reset from the transmitter if you assign a channel to this function.
All status messages are displayed at this point: receiver status and lost fra-
mes; gyro and GPS status if connected.

12 PowerBox-Systems − World Leaders in RC Power Supply Systems
4. MAIN MENU
To access the menu you need to hold the SET button pressed in for about 2 - 3
seconds, after which you can select the desired menu using buttons I and II. Within
the individual menus the selected menu point is always displayed in red.
Press the SET button once you have selected a menu point. You can now alter the
values and settings using buttons I and II.
The “Rotary Menu” shown above contains the following sub-menus:
• iGyro
Here you will nd all the settings relating to the iGyro. These features are only
available if an iGyroSAT is connected to the unit.
• Matching
If you have servos which are mechanically inter-connected, you can use this sub-
menu to adjust them to match each other using a ve-point curve. You will also
nd the Auto Matching function here.
• Sequenzer
At this point you can set up the two independent door sequencers, either manual-
ly or with the help of the Assistant.
• Output
In this menu you can assign all 22 outputs directly to any transmitter channel, to
a Gyro output or to one of the two sequencers.

www.powerbox-systems.com 13
• Input
The transmitter channels are assigned to the iGyro or sequencer here.
• General
This menu is used to alter fundamental settings such as the language or frame
rate.
• Assistent
Always use the Setup Assistant when you are preparing a new model for its rst
ight. This is where the transmitter input channels are determined, the model
type selected, and the servos assigned to the outputs. In just a few minutes the
primary functions can be ready for use, and the Assistant procedure makes it
much easier to set up the gyro functions at a later stage.
5. GENERAL SETTINGS
Before you start using the primary functions (with the help of the Setup
Assistant) and connect the servos, you should enter the basic settings
in the General Settings menu.
• Radio control system
This menu point cannot be selected manually. As already mentioned, the unit au-
tomatically detects the radio control system. If you have already connected your
receivers and bound them to the transmitter, you will see at this point the radio
control system it has detected.

14 PowerBox-Systems − World Leaders in RC Power Supply Systems
• Regulator output
Here you can select your preferred output voltage: you can choose between 6.0V,
7.4V, 7.8V and unregulated output.
We recommend the 7.8V option even for HV servos, as this setting ensures that
your servos operate with constant torque and transit speed for a long period after
switching on. The higher voltage of the batteries, which is only present for a brief
period after charging, is reduced to a level which the battery can maintain for
longer.
• Frame rate
The default setting for this is 16ms, at which all current servo types operate reliab-
ly. Digital servos can deliver better performance if you set the frame rate to 12ms.
Older analogue servos, on the other hand, may become hot if the frame rate is set
too low, and will not be able to nd their commanded position accurately.
• Capacity reset channel
Enter a channel at this point which you wish to use to reset the consumed battery
capacity. The capacity is reset when the selected channel is moved to +100%.
• Language
Select German or English as menu language.
• Reset options
This menu point takes you to a sub-menu in which you can reset various settings
individually or jointly.
6. SETUP ASSISTENT
The Setup Assistant is designed to help you complete basic channel
and servo assignments quickly and easily. We recommend that you
continue to use the Setup Assistant even if you are very familiar with
the workings of PowerBox products. You should also use the Assistant
even if you (temporarily) do not wish to use an iGyroSAT.
On the one hand the Assistant simplies operations, because the menu initially re-
fers to outputs in general terms, such as DIRECT-xy, but once you have completed
the Assistant it uses specic designations, for example, Right aileron … etc.
On the other hand it is possible to retro-t an iGyroSAT without having to re-program
the battery backer.

www.powerbox-systems.com 15
All assignments are already complete, and even the servo matching is maintained.
Before you select the Setup Assistant, establish all the primary functions at the
transmitter, ideally with 50% travel. Mixers such as delta, tailerons and thrust vector
must also be programmed at the transmitter before you start. Check the functions
using your transmitter’s servo monitor. At this stage servo centre positions and di-
rections of rotation do not matter.
If you also intend to use an iGyroSAT, you should now install the gyro sensor in
a suitable position, perpendicular to the fuselage centreline, and connect it to the
socket marked FastTrack on the Royal SR2. If you are also using a GPS III as tele-
metry sensor (and for gyro speed compensation), this should also be connected to
the FastTrack input using a Y-lead.
Select the Assistant widget in the Main Menu, and you will see the following dis-
plays:
In the rst display you select the wing type (Normal / Delta) and the tail type
(Normal, Tailerons or V-tail). You can also determine whether the model has a thrust
vector system (Single or Dual).
On the next screen you enter the number of servos you wish to assign to individual
control surfaces. The Assistant supports a maximum of three servos per control
surface. This means: if your model is tted with six aileron servos, enter 3 for the
right aileron and 3 for the left aileron.
Note: When setting up the PowerBox Royal SR2 for the rst time, please keep
to this sequence:
Setup Assistant (basic setup) –> Sequencer Assistant –> manual output
assignment of all other functions.

16 PowerBox-Systems − World Leaders in RC Power Supply Systems
You will now see further screen displays which vary according to the data you have
already entered. The following illustrations show the aileron channel as an example,
based on the above data:
The left-hand picture shows the empty display. Now move the aileron stick at the
transmitter: the PowerBox checks the input: in this example four channels should
move.
The right-hand picture shows which channels have been detected, and the outputs
to which you should connect the servos. Bearing in mind that your individual trans-
mitter’s channel sequence may not be as shown above, you may need to move the
transmitter stick briey and repeatedly until the detected channels appear after the
appropriate functions.
Repeat the procedure with the elevator and rudder functions. After this you will be
asked to enter the Gain channel for the iGyro.
Note: If multiple servos are mechanically coupled to a single control surface,
disconnect the linkage to servos 2 and / or 3, as the servos are not yet matched
to each other, and you could stall them!

www.powerbox-systems.com 17
You need to assign a channel with +/-100% travel to a rotary control at the transmit-
ter. Even if you have not connected an iGyroSAT, this action is recommended as it
will make it easier to retro-t the gyro.
If you have selected a thrust vector function, you will see a second query regarding
the sensitivity of the thrust vector control system. This is the method the Assistant
uses to set up the basis for a simple but effective method of adjusting gyro gain in
ight.
Once you have assigned the Gain control, press Continue to conrm your choice.
If no iGyroSAT is connected, this concludes the Setup Assistant.
If an iGyroSAT is connected, the next step is to establish the installed orientation
of the iGyroSAT:

18 PowerBox-Systems − World Leaders in RC Power Supply Systems
This is accomplished by moving the model in the directions shown in the graphic
display: rst move the tail of the model up and down two or three times. You will
see that the elevators follow this movement every time - the direction of effect is
not important at this stage.
At the end of the movement hold the model’s tail up and wait until the elevators
return to neutral (centre).
Now repeat the procedure with the rudder (yaw) axis: move the tail to left and right
two or three times – then hold the tail to the right until the rudder returns to neutral.
The Assistant now continues to the process of establishing the directions of effect
(“sense”) and learning the transmitter control end-points. Before you carry out this
procedure, it is essential to set the direction of effect and the end-points of the pri-
mary functions at the transmitter.
Note: This procedure can be awkward to carry out with larger models. However,
there is a simple trick which makes learning the installed position easier: don’t
x the iGyroSAT in the model until after the learning process is complete. During
the learning procedure you simply move the iGyroSAT in the appropriate directi-
on, rather than the model itself!
Note: At any time you can repeat the procedure in the Gyro menu for setting the
direction of effect and the end-points. This is absolutely essential in any case if
you adjust the travels or directions of effect of the primary functions while you
are setting up the model.

www.powerbox-systems.com 19
In this menu the system learns the aileron, elevator and rudder sticks as you hold
each stick in the direction shown on the screen, and press the SET button.
The Setup Assistant is now nished, but you can still assign additional outputs ma-
nually, carry out the Door Sequencer Assistant, or match multiple servos.
.
7.SERVO MATCHING
The Servo Matching function can be used to adjust all 22 outputs in
travel and direction using ve points. Its purpose is to match the travels
of multiple servos which are mechanically interconnected, or which
control multiple functions using only a single channel. For example, the
rudder may be coupled to a steerable nosewheel.
The servo matching procedure is divided up over two screen displays: in the rst
you set and initialise the channel which is to be adjusted.
• Initialising
First centre your transmitter stick, then select Initialise: now move the stick to
both end-points. The screen displays the movement as a bar, and when the mo-
vement is complete, the small red markers remain in place at the end-points.
Note: In contrast to earlier versions of the PowerBox Assistant, it is now pos-
sible to repeat the Setup Assistant at any time. The system retains previously
entered settings, and only overwrites the entries you have changed.

20 PowerBox-Systems − World Leaders in RC Power Supply Systems
• Reversing the output
If you simply wish to reverse the output without adjusting any individual point, just
use the SET button to select Reverse output.
• Manual Matching
Select this menu point if you want to adjust the travel of the selected servo ma-
nually using ve points. The Royal SR2 switches to this display:
The procedure is very simple: use buttons I and II to select the point on the curve
which you wish to change, then press the SET button. The servo automatically
moves slowly to the corresponding point. Now you can alter the servo curve at
this point using buttons I and II.
You don’t need to use the transmitter to maintain the servo position; this makes
accurate settings easier.
Once you have adjusted the curve point to the desired position, press the SET
button again, and the servo slowly travels back to the position corresponding to
the actual stick position.
If you now move the stick, you will see at Input the servo position corresponding
to the transmitter stick position, and at Output the servo position now present at
this servo.
When you have completed all the adjustments, use button I or II to move to End.
Note: This action causes all the servos which are assigned to this input chan-
nel to move to the selected position. If this were not so, mechanically linked
servos would immediately stall each other!