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9.5

Fuel Level

miniDaqu — Manual

4. Daqu channel configuration: Use Nesis/Aetos/Emsis/Blu to enter Daqu

channel configuration values. Consult values given in tables 14 and 15.
All steps so far are necessary to get raw readings from sensor. In the
active (capacitive) case, the readings will be voltages in 0-5 V range. In
the case of resistive sensor the readings will be resistances in the 0-200
(400) Ohm range.

5. Finally, these raw readings must be converted into liters/US gallons.

This step is called the tank calibration. This is not covered in this
manual. Please refer to the Nesis/Aetos/Emsis/Blu manual for more
details.

9.5.2

Installation

Before installing fuel level sensor into fuel tank, ensure that the tank is com-
pletely empty. Make sure to ventilate the tank – fuel vapours are highly
explosive. Fuel level sensor must be grounded at all times. Ground connec-
tion must never break to prevent any electrical sparks near or inside the fuel
tank. When removing fuel level sensor, make sure to disconnect other wires
before the ground wire. When (re)installing fuel level sensor, connect the
ground wire first.

9.5.3

Resistive Fuel Level Sensors

Connection principles for resistive sensors were already given in section 3.3,
starting on page 16.

Typical configuration for a sensor from Figure 27 is shown in Table 14. The
filter time shall be set to maximum.

This softens the response.

Several

resistance ranges can be selected from the sensor list. Select the one, which
fits your sensor the most. The most frequent one is

Res 400 Ohm

, but

Res

160 Ohm

is also often used.

Channel A can be also used for same purpose, but channel A is using weaker
measuring current, which may yield to problems with sensors where mech-
anism is in contact with fuel. Channel A works fine with reed-relay based
sensors, where mechanism is protected from fuel.

9.5.4

Active Sensors

In most cases, active fuel level sensors are capacitive ones. They require some
input power to operate. Please consult the sensor manual for correct voltage.

©

Kanardia

2019-2022

42

Содержание miniDaqu

Страница 1: ...miniDaqu Engine Management System Manual Kanardia d o o June 2022 Revision 1 4...

Страница 2: ......

Страница 3: ...creativecommons org licenses by sa 3 0 In short the license gives you right to copy reproduce and modify this document if you cite Kanardia d o o as the author of the original work you distribute the...

Страница 4: ...t Disposal of Waste Electrical and Electronic Equipment This electrical item cannot be disposed of in normal waste Check with your local authority for kerbside collection or recycle them at a recyclin...

Страница 5: ...history of this document Rev Date Description 1 0 January 2019 Initial release 1 1 March 2019 Unified DB9 markings 1 2 July 2020 Digital PNP sensor schema fix 1 3 June 2021 Clarify description of outp...

Страница 6: ...miniDaqu Manual Kanardia 2019 2022 4...

Страница 7: ...Connectors and Cables 13 2 2 1 Kanardia CAN Bus Connector 13 2 2 2 ECU Connector 15 3 Wiring in General 15 3 1 Connection Wires 16 3 2 Daqu Ground Pin GND 16 3 3 Resistive Sensors 16 3 4 Thermocouple...

Страница 8: ...S 25 6 1 ECU CAN Bus Connection 25 6 2 Configuration 25 6 3 Automatic Start Power Switch 25 6 3 1 Installation 26 6 3 2 Configuration 27 6 3 3 Operation 28 7 ULPower Engines 28 7 1 ECU and AUX Paramet...

Страница 9: ...on 38 9 3 2 Configuration 39 9 4 Current 39 9 4 1 Installation 40 9 4 2 Configuration 40 9 5 Fuel Level 40 9 5 1 General Principles 41 9 5 2 Installation 42 9 5 3 Resistive Fuel Level Sensors 42 9 5 4...

Страница 10: ...and 5 mm outer diameter intake manifold pressure connector Mini version a k a Mini Daqu is used for some modern engines equipped with digital output from their ECU Here most engine sensors are con ne...

Страница 11: ...protocol 1 2 Technical Specifications Table 1 lists technical specifications and figures 1 and 2 shows principal di mensions of Daqu Description Value Weight without cables 90 g Size 76 x 44 x 30 mm O...

Страница 12: ...imensions and connection clearence of mini Daqu Front View 1 3 Power Supply Daqu gets its power supply via CAN bus cable which is typicall connected to some display like Nesis Aetos Emsis Digi This me...

Страница 13: ...g channel with 0 to 30 V input used to read higher voltage levels Only one such channel is available and is used to measure the system voltage Note this is NOT power source for Daqu Daqu is just measu...

Страница 14: ...No not connect any power source to these pins Daqu is powered via CAN bus cable and does not require external power connection over the pins 12 V output pin shall be only used to provide power for so...

Страница 15: ...posed to fluids or moisture Do not put Daqu under coolant expansion bottle Please consider that flying trough rain delivers vast amount of water into engine compartment If Daqu is in engine compartmen...

Страница 16: ...RPM out Figure 3 Details of the mini Daqu connectors The left is used for Kanardia CAN bus and the right connects to an engine ECU D SUB 9 connector is needed The pinout of the connector is given in...

Страница 17: ...ded On the other side of the cable are free ends The pinout of the connector is given in table 3 This connector also host two pins which can drive an external relay This can be used for automatic star...

Страница 18: ...gh aircraft engine block will not damage Daqu but will create unnecessary ground loops which in turn may cause incorrect readings from the engine sensors especially resis tive ones Daqu ground pin sho...

Страница 19: ...ard Daqu must be used 3 5 Analog Active Sensors Active sensors require external power to operate and provide some active signal Some sensors require 12 V and some 5 V to operate These sensors are ofte...

Страница 20: ...5 V on maximal load 0 25 4 75 V output range Sensor outputs 0 25 V when not loaded and 4 75 V on maximal load Figure 6 illustrates an example of active sensor with voltage output connected to an E ch...

Страница 21: ...GND is not required 3 6 Potentiometers Some resistive sensors are in fact potentiometers fuel level trim etc They can be connected as variable resistors or as variable voltage dividers 3 6 1 Variable...

Страница 22: ...ve sensors require external power to operate They produce a step like signal which can be viewed at as pulses Daqu measures time between these pulses Such sensors are used for measuring rotor RPM and...

Страница 23: ...llustrates a typical connection for the PNP case Here an addi tional 2 2 k resistor is needed between GND and signal Do not use higher resistance because internal pull up resistor must be overriden 4...

Страница 24: ...ements are higher the indirect solution must be used Figure 12 illustrates a direct connection to the alarm pins 4 2 Indirect Connection In the cases where load exceeds 150 mA an indirect load connect...

Страница 25: ...1 2 1 BAT V GND 3 5 V 4 AUX 5 6 F1 F 2 FUEL P E2 7 FL 2 GND 8 E1 9 FL 1 Y1 10 ROTOR GND 12 V 11 12 Relay NC NO NC NO DB9 ECU DB9 KANARDIA Open wires Engine ECU DB9 Wire Colour Function 6 Black CAN A L...

Страница 26: ...tal pulses on the pins 5 and 9 of the Kanardia CAN bus connector See Figure 3 and Table 2 It creates one digital pulse per RPM Third party instrument can connect to these pins and detect pulses in ord...

Страница 27: ...ation Manual documentaiton for more details Both lanes are connected to the Daqu Engine ECU connector see section 2 2 Lane A comes from Rotax HIC A connector and Lane B comes from Rotax HIC B connecto...

Страница 28: ...e of the switch is to provide startup power for engine ECU Once engine runs the switch must be turned off as engine provides its own power for ECU This means that two additional operations are require...

Страница 29: ...first pole and power second pole The signal lines must be protected with a flyback diode unless such diode is already built in the relay Use a diode which reverse voltage VR is rated higher than the s...

Страница 30: ...he relay on engine stop Avionics must be turned off and then back on in order to activate automatic start relay again If Daqu fails to engage relay due to some malfunction and you can t start the engi...

Страница 31: ...ock view of ECU connection over RS 232 protocol Figure 20 illustrates an example with one ECU connected to Daqu using CAN bus The AUX box is optional AUXBOX MAP ECU A Baro pressure 120R 120R CAN TPS M...

Страница 32: ...rameters provided by ECU and AUX box with exemp tion of auxilary values Please note that some additional sensors can be connected to Daqu too 7 2 ECU CAN Bus Connection Please note that GND is not con...

Страница 33: ...h ECU1 CAN High Pin 8 CAN B Low ECU2 CAN Low Pin 4 CAN B High ECU2 CAN High Pin 1 GND N C 7 3 ECU RS 232 Connection The serial port interface can be connected to only one ECU Daqu receives data stream...

Страница 34: ...ons ULPower RS 232 when ECU is connected using RS 232 serial connection ULPower CAN 125 kb s when ECU is connected using CAN The communi cation speed is 125 kb s This speed was used ECUs delivered unt...

Страница 35: ...UX 5 6 F1 F 2 FUEL P E2 7 FL 2 GND 8 E1 9 FL 1 Y1 10 ROTOR GND 12 V 11 12 DB9 ECU DB9 KANARDIA Open wires Engine ECU DB9 Pin Wire Colour Function Function 6 1 Black GND CC m DB 9 male CAN A LOW 8 5 Bl...

Страница 36: ...embrane and on the other side is atmospheric or better said surround ing pressure hence term vented This surrounding pressure serves as reference This is what you usually need to measure oil or fuel p...

Страница 37: ...s enter bar value during channel configuration 9 1 4 Variable Voltage Sensors with variable voltage output were described in section 3 5 1 Connec tion example is given on Figure 6 It shows an active s...

Страница 38: ...Function Fuel pressure Sensor 4 20 mA Int Res Report time 0 5 1 0 s Filter 2 0 s Max value at 20 mA 10 depends on sensor Table 9 Typical fuel pressure configuration for sensors with current output Max...

Страница 39: ...10 Rotax iS engine with vented gage fuel pressure sensor Option Selection Setting Channel Any E or F Function Fuel P cmp Sensor Active 0 5 4 5 V Report time 0 5 1 0 s Filter 2 0 s Max value at 4 5 V...

Страница 40: ...then calculated as F S M 9 3 Voltage Daqu can measure voltages from 0 to 30 V DC on the channel C The system voltage is usually measured on this channel Some engines Rotax iS for example transmit the...

Страница 41: ...system bus source 9 3 2 Configuration The table 12 shows correct channel settings Option Selection Setting Channel C only Function Voltage Sensor Voltage Report time 0 5 1 0 s Filter 1 0 s Table 12 C...

Страница 42: ...rovides sensor ground and connects to GND pin White wire provides signal and connects to one of E or F channels See Figure 26 for proper connection schema C 1 2 1 BAT V GND 3 5 V 4 AUX 5 6 F1 F 2 FUEL...

Страница 43: ...t must be also calibrated to indicate fuel level in the tank properly The tank calibration procedure is not part of this secion Please also note that some sensors capacitive ones usually require senso...

Страница 44: ...rks near or inside the fuel tank When removing fuel level sensor make sure to disconnect other wires before the ground wire When re installing fuel level sensor connect the ground wire first 9 5 3 Res...

Страница 45: ...Filter 2 5 s Table 14 Typical fuel level configuration In the case of capacitive sensors some special sensor specific calibration pro cedure is usually required consult the sensor manual for more det...

Страница 46: ...l fuel level configuration for a capacitive sensor 9 5 5 Tank Shape Calibration After sensor was installed properly connected and calibrated when neces sary and appropriate channel was configured tank...

Страница 47: ...ariable resistance The correspond ing channel is configured something like shown by Table 16 Option Selection Setting Channel Any E or F Function Pitch trim Sensor Res 400 Ohm 5 kOhm 10 kOhm Report ti...

Страница 48: ...given in section 3 7 Two schematics were given one for NPN sensor Figure 10 and the other for PNP sensor Figure 11 Let s assume that sensors is applied to a rotor and it is counting teeths in the roto...

Страница 49: ...shaft directly from engine drive with two pulses per shaft revolution The shaft turns rotor via reductor Reductor s ratio is 5 814 Your case will be different 9 8 Fuel Flow Fuel flow sensors are activ...

Страница 50: ...general Sensor shall not be installed close to hot parts like exhaust system Some sensors use NPT fittings tapered Always respect maximal torque allowed when tightening the fitting Never use Teflon t...

Страница 51: ...n during the design production storage and handling it may happen that the Product will be defective in some way Please read the following sections about the warranty and the limited opera tion to get...

Страница 52: ...ty of any kind Software distributed by Kanardia with or without the Kanardia s brand name including but not limited to system software is not covered under this Lim ited Warranty Refer to the licensin...

Страница 53: ...s of profits on contracts loss of the use of money loss of an ticipated savings loss of business loss of opportunity loss of goodwill loss of reputation loss of damage to or corruption of data or any...

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