RS Flight Systems SCU Front Panel V2 User manual

Installation / Operation
Manual
SCU Front Panel V2
Version: 1.02 © Copyright 2022 RS Flight Systems GmbH

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Installation / Operation Manual
SCU Front Panel V2
Contents
1. Preface..............................................................................................................................................3
2. System Description...........................................................................................................................3
3. Technical Specifications....................................................................................................................5
4. Electrical Installation ........................................................................................................................9
5. Operation....................................................................................................................................... 12
5.1 Starting, Aux Fuel, Battery Backup:....................................................................................... 12
5.2 Display Panel: ........................................................................................................................ 13

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1. Preface
Thank you for purchasing an RS Flight Systems SCU Front Panel V2. We are pleased that you have
chosen our product and are confident that it will meet all your expectations. In case of questions or
problems with the unit, feel free to contact us:
RS Flight Systems GmbH
Oberer Luessbach 29-31
82335 Berg | Germany
Phone: [phone]
E-Mail: [e-mail]
2. System Description
The SCU Front Panel V2 is an optional extension unit specifically developed for the RS Flight Systems
System Control Unit (SCU) for BRP Rotax iS engines.
Its main functions are:
-Indication of the most important engine parameters, engine status and ECU faults
-Simple and self-explanatory operation via three push buttons
-All necessary indicator lights for Rotax iS engine operation
-All necessary switches for Rotax iS engine operation
The switching characteristics of the SCU Front Panel V2 differ from the ones for the Rotax 912 and 914
engine series. Therefore, the different engine series have an altered starting procedure. For the
starting procedure, see chapter 5. Operation. The SCU Front Panel V2 includes the control of LANE A
and LANE B as well as the Main Fuel Pump and the Auxiliary Fuel Pump via a turning switch. Further,
the System Control Unit (SCU) is controlled by the Start SCU Front Panel V2 via a key turning switch.
The SCU Front Panel V2 is shown in Figure 2-1 and Figure 2-2.
The scope of delivery consists of:
-1x Preassembled SCU Front Panel V2
-2x Start Key
-2x Ring Cable Lug 0.5-1.0mm² M3
-4x Ring Cable Lug 1.1-2.5mm² M3
-16x Ring Cable Lug 0.5-1.1mm² M4
-10x Ring Cable Lug 1.1-2.5mm² M4

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Installation / Operation Manual
SCU Front Panel V2
Figure 2-1: SCU Front Panel V2 front view
Figure 2-2: Front Panel V2

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3. Technical Specifications
The technical specifications of the SCU Front Panel V2 are listed in Table 3-1Table 3-1: Technical
specification. The dimensions of the panel cut-out can be seen in Figure 3-1.
SCU Front Panel V2
Mechanical
Dimensions
(width, height, depth)
206 x 66 x 130 mm
8.11 x 2.6 x 5.12 in
Panel Cutout
Dimensions
(width, height)
198 x 58 mm, 12mm corner radius
7.8 x 2.28 in, 0.47in corner radius
Mounting Depth
excl. Connectors
91.9 mm
3.62 in
Maximum Panel
Thickness
6 mm
0.23 in
Mounting
4 x M4 Screws
Total Mass
0.577 kg
1,272 lbs
Supply Voltage
12 V and 3.3 V, supplied by the SCU Main Unit
Lane A/B LEDs supplied by ECU / HIC connector
Power Consumption
typ. 0.5 W
Operating Altitude
< 7,620 m
< 25,000 ft
Operating
Temperature Range
-20 to +70 oC
-4 to +158 °F
Humidity
< 95 %, non-condensing
Table 3-1: Technical specification
The mechanical dimensions are shown in in the drawings in Figure 3-1 , Figure 3-2 and Figure 3-3.

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Installation / Operation Manual
SCU Front Panel V2
Figure 3-1: SCU Front Panel V2 drawing front view
Figure 3-2: SCU Front Panel V2 drawing top view

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Figure 3-3: SCU Front Panel V2 drawing side view
Figure 3-4: SCU Front Panel V2 drawing isometric view

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Installation / Operation Manual
SCU Front Panel V2
The switching logic is listed in Table 3-2 and Table 3-3 . “On” means the corresponding pin numbers
are electrically conductive. “-“ means the corresponding pin numbers are electrically non-conductive.
Name
BAT ON
SCU ON
LANE A
LANE B
Backup BAT
GND
Name
Position
Pin
1/2
3/4
5/6
7/8
9/10
11/12
OFF
0°
-
-
-
-
-
On
BATTERY
ON
45°
On
-
-
-
On
-
ENGINE
POWER
90°
On
On
On
On
On
-
Table 3-2: Start Switch Key switching arrangement
Name
LANE A
LANE B
Fuel Pump Main
Fuel Pump AUX
Starter
Name
Position
Pin
1/2
3/4
5/6
7/8
013
/014
OFF
0°
-
-
-
-
-
LANE A
+ FP Main
45°
On
-
On
-
-
Lane A+B
+ FP Main
90°
On
On
On
-
-
PUSH
90°
On
On
On
-
On
Lane B
+ FP Aux
135°
-
On
-
On
-
Table 3-3: Lane Switch Knob switching arrangement

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4. Electrical Installation
The Switches of the Front Panel V2 are connected to the Rotax HIC connectors A and B. The detailed
pinout is listed in Table 4-1 and shown in the sketches in Figure 4-1 and Figure 4-2.
Pin Start
Key Switch
Connector
Pin
Signal Name
Signal Description
Current /
Wire Size
1
-
-
BAT
BAT Supply
2
-
-
BAT
BAT Signal
3
-
-
SCU
SCU Supply
4
-
-
SCU
SCU Signal
5
HIC A
1
LANE_SEL_SW_A_1
Lane A Supply
7,5 A
6
Lane Switch
2
LANE_SEL_SW
Lane A Signal
7,5 A
7
HIC B
1
LANE_SEL_SW_B_1
Lane B Supply
7,5 A
8
Lane Switch
4
LANE_SEL_SW
Lane B Signal
7,5 A
9
-
-
BAT_BCKP
BATTERY BACKUP
Supply
10
-
-
BAT_BCKP
BATTERY BACKUP
Signal
11
-
-
GND
EMS GND
AWG 22
12
-
-
GND
Aircraft GND
AWG 22
Table 4-1: Start Switch Key pinout

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Installation / Operation Manual
SCU Front Panel V2
Pin Lane
Switch
Connector
Pin
Signal Name
Signal Description
Current /
Wire Size
1
HIC A
7
LANE_SEL_SW_A_2
Lane A Supply
7,5 A
2
Start Key
Switch
6
LANE_SEL_SW
Lane A Signal
7,5 A
3
HIC B
9
LANE_SEL_SW_B_2
Lane B Supply
7,5 A
4
Start Key
Switch
8
LANE_SEL_SW
Lane B Signal
7,5 A
5
HIC A
3
SIG_FUEL_PUMP_1
Fuel Pump Main Signal
10 A
6
HIC A
9
GND_FUEL_PUMP_1
Fuel Pump Main Supply
10 A
7
HIC B
11
GND_FUEL_PUMP_2
Fuel Pump AUX Supply
10 A
8
HIC B
3
SIG_FUEL_PUMP_2
Fuel Pump AUX Signal
10 A
013
HIC B
4
CONN_STARTER_REL_SW
Starter Signal
5 A
014
HIC B
12
SUPP_START_SWITCH
Starter Supply
5 A
Table 4-2: Lane Switch Knob pinout

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Figure 4-1: SCU Front Panel V2 wiring diagram
Figure 4-2: Display Panel LED connector wiring diagram
11 9 7 5 3 1
12 10 8 6 4 2
1
kΩ
7 5 3 1
8 6 4 2
013 014
SCU LED
To SCU
To Bat. Rel.
To Main Bus
Bat. Bckp Aux FP
Fuse Box
To SCU Front Panel out
To Main Bus
To Bckp Bat. Rel.
See LED conector pinout
SCU LED
To SCU Front Panel out
1 2 3 4 5 9
To Main Bus

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Installation / Operation Manual
SCU Front Panel V2
5. Operation
This chapter describes operational procedures for the SCU Front Panel V2.
5.1 Starting, Aux Fuel, Battery Backup:
•Start Switch in “OFF”position: both grounds “Aircraft” and “EMS” are shorted to avoid
different potentials during refueling and ground handling.
•Start Switch in “BATTERY ON” position: The master relay is activated.
•Start Switch in “ENGINE POWER” position: the SCU is powered. 1 sec later, the SCU activates
the Start Power Relay and supplies the ECU with power. Also, the Backup Battery Switch is
enabled in this position.
•Lane Switch in “LANE A” position: The ECU LANE A is activated, and the Main Fuel Pump is
supplied with power.
•Lane Switch in “LANE A+B” position: The ECU LANE A and B are supplied with power, and the
Main Fuel Pump is supplied with power. Hold this position for at least 1 sec. every time you
pass it.
•Lane Switch in “LANE A+B” position pushed: The starter relay of the engine is activated. The
“ENGINE START” position is spring loaded. After starting the engine, maintain in position
“LANE A+B”. The Start Power Relay is automatically switched off by the SCU 3 sec. after the
engine has reached 1500 rpm.
•Lane Switch in “LANE B” position: The ECU LANE B is supplied with power, and the Auxiliary
Fuel Pump is supplied with power.
•The Auxiliary Fuel Pump can alternatively be switched on by switching the toggle switch
“AUX FUEL PUMP” to “ON”.
•The Backup Battery, if needed, can be utilized by switching the “BATTERY BACKUP” toggle
switch to “ON”. This is only possible in “ENGINE POWER” position of the Engine Switch.
•Both Lane A and Lane B can independently be switched off by turning either the Start Switch
or the Lane Switch to the “OFF” position.
Regarding the Lane check please refer to the Operators Manual by Rotax.

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5.2 Display Panel:
•After switching the Start Switch to “ENGINE POWER”, the Display Panel will light up and
briefly show the SCU’s software version. The Display Panel will then switch to the startup
mode
•Startup mode: In the first line, engine failure information is shown.
In the second line are shown: CMD (commanded RPM for SLPC) and RPM (actual engine
rpm).
In the last line the recommended throttle position for engine startup is displayed.
•Normal operation mode: In the first line, engine failure information is shown.
In the second line engine data is displayed.
With the “MCR” (Master Caution Release) button, all displayed engine failure information
will be deleted.

RS Flight Systems GmbH
Oberer Luessbach 29-31
82335 Berg | Germany
[phone]
[e-mail]
www.rs-flightsystems.com
SCU Front Panel V2 | Version: 1.02
© Copyright 2022 RS Flight Systems GmbH