RS Flight Systems SCU 9iS Manual

System control unit

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Installation / Operation

Manual

SCU 9iS

System Control Unit

Version: 2.0

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Summary of Contents for RS Flight Systems SCU 9iS

Page 2: Table Of Contents
Contents Preface .............................3 System Description ..........................3 Technical Specifications ........................5 Mechanical Installation ........................7 Drawings SCU 9iS Main Unit ....................8 Drawings SCU Display Panel ....................9 Drawings SCU Front Panel ....................10 Drawings SCU Front Panel ....................12 Electrical Installation ........................13 Lane A / Lane B / Lane C Connector ................... 14 Auxiliary Connector ......................
Page 3: Preface
Preface Thank you for purchasing a System Control Unit from RS Flight Systems. 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:...
Page 4 Figure 2-1: Top view of the SCU 9iS Figure 2-2: SD Card Cover In combination with either of the two optional extension units (Front Panel including switches or Display Panel without switches), the following additional functions are offered: • Indication of the most important engine parameters, engine status and ECU faults •...
Page 5: Technical Specifications
-20 to +70 Temperature Range -4 to +158 < 7,620 m Operating Altitude < 25,000 ft Humidity < 95 %, non-condensing Table 3-1: Technical Specification SCU 9iS and SCU9iS BB Installation / Operation Manual 30.03.2025 | V2.0 System Control Unit...
Page 6 SCU Display Panel SCU Front Panel Mechanical 90 x 66 x 23.5 mm 150 x 66 x 97.5 mm Dimensions 3.54 x 2.6 x 0.93 in 5.91 x 2.6 x 3.84 in (width, height, depth) Panel Cutout 82 x 58 mm, 12 mm corner radii 142 x 58 mm, 12 mm corner radii (width x height) 3.23 x 2.28 in, 0.47 in corner radii...
Page 7: Mechanical Installation
Figure 4-9 and Figure 4-11 ) and are mounted on the aircraft instrument panel using four M4 Philips headed screws included in the package. Three-dimensional CAD-models of all units are available on the RS Flight Systems website: www.rs-flightsystems.com As waste heat is dissipated via free convection, leave at least a 5 mm gap from the exterior surfaces (excluding the mounting face) to any other object.
Page 8: Drawings Scu 9Is Main Unit
Drawings SCU 9iS Main Unit Figure 4-1: SCU 9iS Main Unit (front view) Figure 4-2: SCU 9iS Main Unit BB (front view) Figure 4-3: SCU 9iS Main Unit (side view) Figure 4-4: SCU 9iS Main Unit BB (side view) Figure 4-5: SCU 9iS Main Unit (iso view) Figure 4-6: SCU 9iS Main Unit BB (iso view) 30.03.2025 | V2.0...
Page 9: Drawings Scu Display Panel
Drawings SCU Display Panel Figure 4-7: SCU Display Panel (top view) Figure 4-8: SCU Display Panel (side view) Figure 4-9: SCU Display Panel (front view) Installation / Operation Manual 30.03.2025 | V2.0 System Control Unit...
Page 10: Drawings Scu Front Panel
Figure 4-10: SCU Display Panel (isometric view) Drawings SCU Front Panel Figure 4-11: SCU Front Panel (front view) 30.03.2025 | V2.0 Installation / Operation Manual -10- System Control Unit...
Page 11 Figure 4-12: SCU Front Panel (top view) Figure 4-13: SCU Front Panel (side view) Figure 4-14: SCU Front Panel (isometric view) Installation / Operation Manual 30.03.2025 | V2.0 System Control Unit -11-...
Page 12: Drawings Scu Front Panel
Drawings SCU Front Panel Figure 4-15: SCU Front Panel V2 drawing isometric view For the SCU Front Panel V2, please refer to the Installation / Operation Manual SCU Front Panel V2. 30.03.2025 | V2.0 Installation / Operation Manual -12- System Control Unit...
Page 13: Electrical Installation
Female Mini-DIN 6 GNSS Antenna Table 5-2: SCU 9iS Main Unit BB connectors Place the GNSS antenna in a spot where it has maximum optical visibility of the sky, e.g. the glare shield on top of the instrument panel. Poor GNSS reception has no adverse impact on the operation of the unit yet may impair recordings of position, ground speed and UTC data.
Page 14: Lane A / Lane B / Lane C Connector
AS27500. AWG22 (0.34 mm²) is a sufficient cross section for power supply of the SCU. Preassembled wiring harnesses are available as accessories for simplifying the installation. For part numbers see Chapter 5.7 or contact RS Flight Systems directly. Ensure that proper grounding connections are made and that the various ground potentials are not connected outside of the Main Unit.
Page 15 Pin Number Signal Name Function PWR_IN positive SCU power supply CANL_A CAN Low, connect to HIC A, Pin 5 EXT_PWR_ACT do not connect EXT_DIN2 do not connect negative SCU power supply, ground AC_GND EXT_DIN0 do not connect CANH_A CAN High, connect to HIC A, Pin 6 EXT_DIN1 do not connect LS_OUT1...
Page 16: Auxiliary Connector
Auxiliary Connector The Auxiliary Connector is used for general I/O purposes. It offers regulated 12 V (Pin 13) and 5 V (Pin 11) reference voltages for sensors and can supply a maximum of 100 mA each. Both supplies are referenced to a common ground (Pins 5 and 12) isolated from the aircraft supply potentials. The analog inputs also refer to the same potential.
Page 17 An extinguishing diode across the relay coil is not needed and a suitable relay is available as an accessory (see Chapter 5.7). The Starter relay is intended for use on unmanned aircraft. Feel free to contact RS Flight Systems for different sensor and actuator configurations. Installation / Operation Manual 30.03.2025 | V2.0...
Page 18: External Connector
Power Output (9-32 V) Table 5-8: External Connector pinout Feel free to contact RS Flight Systems for your needs regarding I/O applications. Examples are automatically controlled LANE and fuel pump switches, temperature-controlled fan activation (Intercooler, Oil cooler), UAV applications and many more.
Page 19: Front Panel Out Connector
(see Chapter 5.7). The pinout of the Front panel out connector is listed in Table 5-9. The Front Panel out connector is only available on the SCU 9IS Main Unit. Pin Number...
Page 20 The Start/Backup Power LED (pin 5) can be connected in parallel to the Start Power Relay in order to show the pilot the status of Start Power Relay function. For the connection of the generator LEDs please refer to the manual of the generator. Pin Number Signal Name Function...
Page 21: Wiring Diagram Scu
Wiring Diagram SCU Main Bus Lane A Aircraft GND Power Supply Ground HIC A CAN_LOW_1_LA CAN Low A CAN High A CAN_HIGH_1_LA Aircraft GND CAN_GND_1_LA Lane B HIC B CAN_LOW_1_LB CAN Low B CAN High B CAN_HIGH_1_LB CAN_GND_1_LB Aircraft GND Lane C Third party display...
Page 22: Available Accessories
Available Accessories Part No. Name Description Shielded cables for the connection of the SCU Lane A, B and C to 10-135 Wiring Harness Kit SCU BRP Rotax 912/915 iS engines. Including power supply wires. Open wire ends at the side of the ECU. Length 2 m / 6.5 ft. Wiring Harness SCU Prewired shielded harness for the connection of the Front Panel or 10-148...
Page 23: Operation
Operation Startup Power Relay Function For the Rotax 912iS / 914iS / 915iS / 916iS engines, the spring-loaded “Start Power Switch” (SPS), as specified in the BRP-Powertrain installation manual, has to be activated prior to engine start. As soon as START has been commanded and the engine is running, the SPS must be released. The function of the SPS is to temporarily feed aircraft battery power to the Engine Control Unit (ECU), so that engine start is possible.
Page 24: Single Lever Power Control
Single Lever Power Control option is only available in combination with a mt propeller governor type P-853-XX and a hydraulic constant speed propeller (e.g. mt propeller MTV-6, MTV-34). For installation of the SLPC please refer to chapter 6.2. Feel free to contact RS Flight Systems for different SLPC configurations.
Page 25 Two manual SLPC test versions are available at the RS Flight Systems website: RM02.01 for the 912iS and RM12.01 for the 915iS / 916iS. In both versions the requested RPM value can be selected with two push buttons on the SCU Display Panel or SCU Front Panel.
Page 26: Display Function
Display Function If connected, the SCU shows engine and status information on the Display Panel. During SCU boot process the firmware version is displayed, after activating the CAN Lanes, the recommended throttle position is shown. After engine start, engine status information in sub menu 1 – 10 is available according to Figure 6-6.
Page 27 Menu LH indicator RH indicator Manifold pressure MAP [mbar] Engine RPM [rpm] Throttle position sensor TPS [%] Engine RPM [rpm] Oil temperature OILt [°C] Oil pressure OILp [bar] Coolant temperature CHT [°C] Ambient temperature AMBt [°C] Fuel flow FF [l/h] Fuel pressure FP [bar] Exhaust gas temperature EGT1 [°C] Exhaust gas temperature EGT2 [°C]...
Page 28: Advanced Fuel Pressure Offset Configuration
Advanced Fuel Pressure Offset Configuration By creating a “EMU912IS.CFG” file on the SD card with a common text editor offset options can be selected. The .CFG file is formatted as the following example: UNITS=Metric RPM=CRANKSHAFT MAN=HPA SEC=MAP FPO=2 To change offset setting, exchange the Fuel Pressure Offset (FPO) definition “2” with a value according to Table 6-3: Fuel Pressure Offset, save file to SD card and reboot SCU.
Page 29: Flight Data Recording
2000 hours (TBO of the engine). If a SDXC card with 64 GB or more is used it must be formatted with FAT32. The SCU 9iS Main Unit BB is equipped with a 128 GB SDXC card. An adapter to connect the Black Box to a card reader is available for OEMs at RS Flight Systems on request.
Page 30 Figure 6-8: EMDS Data Screen Figure 6-9: EMDS Fault Matrix Screen 30.03.2025 | V2.0 Installation / Operation Manual -30- System Control Unit...
Page 31: Software Update
Figure 6-10: EMDS Limits Screen Figure 6-11: EMDS generated Google Earth View Software Update The SCU allows for easy conduction of software updates through the SD memory card interface. The software is delivered in compressed .zip-files with the following exemplary structure: SCU_915iS_SW_RS11.1C.zip ->...
Page 32 (“INSTALL.LOG”) is created and stored on the memory card and the update files are deleted. The standard software versions are listed in Table 6-4. Feel free to contact RS Flight Systems for customized software versions with individual SLPC algorithms.
Page 33: Abbreviations And Terms
Abbreviations and Terms Abbreviation Description Active Aircraft Voltage Auxiliary American Wire Gauge Brightness Computer Aided Design Controller Area Network Cylinder Head Temperature CONF Configuration Coolant Temperature Direct (non-alternating) Current Do Not Connect Engine Control Unit ECU Voltage Exhaust Gas Temperature EMDS Engine Management Debriefing Station Engine Management Unit...
Page 34 Unified National Thread - Coarse Coordinated Universal Time 30.03.2025 | V2.0 Installation / Operation Manual -34- System Control Unit...
Page 36 RS Flight Systems GmbH Oberer Luessbach 29-31 82335 Berg | Germany +49 8178 8681 – 300 contact@rs-flightsystems.com www.rs-flightsystems.com SCU 9iS | Version: 2.0 © Copyright 2025 RS Flight Systems GmbH...

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