MGL Avionics EMS-1 Installation Manual
MGL Avionics EMS-1 is a versatile engine monitoring system designed for various aircraft applications. This 2 1/4” (57mm) color display instrument replaces multiple individual monitoring devices, providing a comprehensive and easy-to-read interface. Its compact size and advanced features make it ideal for both light and heavy aircraft, offering real-time data on RPM, EGT/CHT, fuel flow, pressure, temperature, and more. The EMS-1 also supports integration with external RDAC units for enhanced data acquisition and remote monitoring capabilities.
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Vega EMS-1 Universal Engine Monitoring System Operating Manual – English 1.05 Introduction The Vega EMS-1 is a 2 1/4” (57mm) universal engine monitor color display instrument. The EMS-1 contains all the necessary functionality to replace several engine monitoring instruments. All information is displayed in an easy to read format on a high resolution wide viewing angle 1.8” 1000cd/m2 sunlight readable color display. The EMS-1 light weight, small size and high level of functionality makes it an excellent choice for all types of engines. The EMS-2 can also interface directly to UL Power engines via the RS232 port. The EMS-1 can also be interfaced via the CAN bus to an optional external RDAC unit (Remote Data Acquisition Computer). This allows for easier installation as the RDAC unit is normally mounted in the engine compartment. Vega EMS-1 Operating Manual Page 2 1 Features • • • • • • • • • Large 1.8” high resolution 160x128, sunlight readable, wide viewing angle, 1000 cd/m2 TFT LCD display The engine display screen is automatically configured to optimize screen space depending on what engine parameters have been selected Optional External RDAC (Remote Data Acquisition Computer) interfacing via the CAN bus Standard 2 1/4” (57mm) aircraft enclosure (can be front or rear mounted) Rotary control plus 2 independent buttons for easy menu navigation and user input An external output activates when a alarm condition has been reached Includes a RS232 serial output for interfacing to external equipment e.g dataloggers etc. Wide input supply voltage range of 8 to 30V DC 1 year limited warranty EGT/CHT • • • • • • • • Can measure up to 4 thermocouple channels using the internal electronics or up to 12 thermocouple channels using an optional external RDAC EGT/CHT Temperatures can be displayed in ºC or ºF from -100ºC to 1200ºC (-148ºF to 2192ºF) High accuracy: Built in thermocouple linearization curves and cold junction compensation Includes an EGT/CHT trend graph display of each thermocouple channel Records maximum EGT/CHT temperature reached for each channel Includes an engine leaning feature Includes an engine cruise feature Special Rotax 912/914 engine monitor mode utilizing the standard built in Rotax NTC CHT probes RPM • • • • Single or dual RPM measurement Includes a magneto check function RPM can be displayed in RPM or in percentage Records maximum RPM reached for each channel Fuel Flow (Uses RPM 2 Input) • • Single fuel flow measurement Fuel flow can be displayed in L/hr or in G/hr Fuel Level • • • Analog inputs can be used to measure fuel level Fuel level can be displayed in Litres or Gallons Standard automotive fuel level senders can be used, even with odd shaped tanks due to a comprehensive, multi-point calibration system Analog Inputs • • • • • • • • • • • • • Can measure up to 4 Analog channels Analog channels are universal and can be configured to measure Pressure, Temperature or Current Current measurement requires a MGL Avionics Closed Loop Current Sensor Pressure can be measured using standard automotive resistive senders (e.g. VDO 2, 5 and 10Bar), Rotax 4-20mA senders as well as voltage output pressure senders (e.g. UMA) Temperature can be measured using standard automotive resistive senders (e.g. VDO, Westach) as well as the MGL Avionics precision LM335 semiconductor sensor Fuel level can be measured using standard automotive fuel level senders, even with odd shaped tanks due to a comprehensive, multi-point calibration system High accuracy: Built in linearization curves for common senders Analog channels can be programmed to a user defined curve for custom senders Supports the Rotax 4-20mA pressure sender as used in the 912/914 engines Temperatures can be displayed in ºC or ºF Pressure can be displayed in psi or bar Fuel level can be displayed in Litres or Gallons Records minimum and maximum values reached for each channel Vega EMS-1 Operating Manual Page 3 Manifold Pressure • • • Manifold pressure can be displayed in millibar (mB) or in inches of Mercury (“Hg”). Records maximum MAP reached in permanent memory MGL Avionics RDAC-XF MAP required Timers • • • • • • Displays both UTC (Zulu time) and local time Time is maintained by an internal lithium battery which can be replaced by the user Includes a settable Hobbs meter which is password protected Includes an engine running and flight timer Includes a programmable maintenance timer for scheduled routine engine maintenance Provides a 50 entry flight log that stores the start time and duration of each of the last 50 flights. The flight timer can either be started automatically or by using a front push button Volts • • • Can measure voltages up to 30V (compatible with both 12V and 24V aircraft supplies) Contains a programmable low/high voltage alarm to automatically detect alternator failures and bad batteries Records maximum and minimum Volts reached in permanent memory Current (RDAC connection) • • Uses the MGL Avionics Closed Loop Current Sensor to measure the aircrafts current load. Records maximum and minimum current reached in permanent memory UL Power ECU Display • • • Displays engine information from the UL Power ECU (Engine Control Unit) The EMS-1 has a dedicated UL Power ECU display screen Displays warning messages from the UL Power ECU Vega EMS-1 Operating Manual Page 4 2 Layout Sunlight readable color graphic display: Backlight can be adjusted in the menu system F1 / Up Button: Menu System: Softkey button Normal Display: Start / Stop the flight timer (Manual flight only) 2 1/4” enclosure. Can be front or rear mounted F2 / Down Button: Menu System: Softkey button Normal Display: Enable/disable Engine Leaning and Cruise mode Rotary Control (Up/Down) & Enter Button: Press the rotary control during the normal display screens to access the menu system. Rotate anti/clockwise for up/down menu scrolling. Rotate the rotary control during the normal display mode to view the Timers, Trend Graphs and the Max Values display. 3 Main Displays The EMS-1 display screen is automatically configured to optimize screen space depending on which engine parameters have been selected. The Timers display, Trend graph and Max Values display can be selected by rotating the rotary control. RPM / MAP / Volts / Fuel flow display section Analog Channel section (Pressure / Temperature / Current / Volts / MAP/ Fuel Level) EGT/CHT display section Vega EMS-1 Operating Manual Page 5 RPM / MAP / Volts / Fuel Flow display section The RPM / MAP / Volts display section will maximize the space according to which parameters are enabled. Single RPM displayed Volts only displayed MAP only displayed Single RPM and Volts displayed Single RPM and MAP displayed Dual RPM displayed, RPM 2 in percent Single RPM and Fuel flow Analog Channel section (Pressure / Temperature / Current / Volts / MAP / Fuel Level) The Analog channels display section will maximize the space according to which parameters are enabled. MAP and Current can also be displayed in a bargraph format. If more then 2 parameters are displayed then the EMS-1 will alternate the display at 2 second intervals. EGT/CHT display section The Vega EMS-1 supports up to 4 thermocouples (using the internal electronics) and up to 12 thermocouples (using the optional external RDAC). The EGT/CHT section will automatically try and maximize the display area according to the number of EGTs/CHTs selected. The EGT/CHT parameters can be configured in the “EGT SETUP” and “CHT SETUP” menu. The EGT/CHT number will highlight to the indicated the temperature value if “HIGHEST” is selected. The EGT highlight color is magenta, and the CHT color is cyan. High Alarm High Caution Maximum temperature reached indicator Temperature unit EGT group indicator Indicates highest value if “HIGHEST” is selected or the highlighted bar value if “SCANNING” is selected CHT group indicator Vega EMS-1 Operating Manual Page 6 3.1 Timers display LOCAL: Local time normally includes an offset from UTC time. The time offset can be setup in the “TIMERS SETUP” menu. UTC: This is also know as Zulu or GMT time. The UTC time can be set in the “TIMERS SETUP” menu. FLIGHT: The flight time is automatically reset to zero when a new flight is started (manual or automatic flight detection). The “:” will flash when a flight is active. The flight timer can be started pressing the F1/UP key (Manual flight mode). HOBBS: The Vega EMS-1 contains a password protected Hobbs timer. The Hobbs time can be set to the current known engine time in the “TIMERS SETUP” menu. The Hobbs timer will only increment when the RPM is greater then the “HOBBS RPM”. MAINT: (Maintenance Timer) This timer is set in engine hours and it will count down to zero when the engine RPM is greater then the “HOBBS RPM” value as set in the “TIMERS SETUP”. A good use for this function is to set the hours until your next spark plug change or engine inspection. The purpose of this function is to assist you in determining remaining hours until maintenance will be required. It is not intended as a replacement for the aircraft's maintenance log. It is therefore important that the aircraft's maintenance log be maintained in the normal manner. You should further use your own discretion in performing maintenance earlier than indicated should any aircraft performance problems arise. A maximum of 999 hours can be entered as a maintenance interval. A reminder message will appear on startup when zero hours are remaining. The reminder message will disappear after the pilot presses any key. Engine running time for the purpose of the mainteance timer is defined as the run time where the engine RPM is greater than the “HOBBS RPM” value as set in the “TIMERS SETUP”. Vega EMS-1 Operating Manual Page 7 3.2 EGT/CHT Trend Graph display This display can be accessed by rotating the rotary control during the normal display mode. The trend graph displays the last 160 seconds of EGT/CHT temperature readings. 3.3 Maximum Values display This display can be accessed by rotating the rotary control during the normal display mode. Press the F1/Up button when the max values display is showing to reset the maximum values. Note: The maximum values are stored in non-volatile memory and are recalled on power-up. 3.4 Engine leaning mode EGT information is also very useful for fuel mixture control. As the fuel mixture is leaned, so the exhaust gasses get hotter. This rise in temperature is a sign of increased combustion efficiency as the optimum mixture setting is approached. If the leaning progresses past a certain point however, the temperature will begin to drop. This temperature drop is the result of reduced energy output from the diminished fuel flow. The best operating mixture for aircraft engines is in the vicinity of this peak EGT reading. The EMS-1 has a special Leaning mode, which easily identifies the peak EGT condition allowing you to adjust your fuel mixture for best performance. Fuel mixture should be adjusted once you have decided on a suitable cruise power setting (typically 70%). Press the F1/Up button on the main display to enable the engine leaning mode. The "LEAN" label is displayed at the top of the main display to clearly differentiate it from the normal operating mode. As the fuel mixture is slowly leaned past the point at which the temperature begins to drop (by more than 10°C/15°F), the absolute EGT temperatures will change to show the EGT reading relative to this peak. The sequential order as each cylinder peaks is also shown. Leaning mode can be canceled by pressing the F1/Up button again. Vega EMS-1 Operating Manual Page 8 3.5 Engine cruise mode Once in the cruise, press the F2/Down button to enable the Cruise Mode. The "CRUISE" label is displayed at the top of the main display to clearly differentiate it from the normal operating mode. All EGT and CHT readings are immediately sampled as reference temperatures for the cruise. The display then shows EGT and CHT values relative to this reference temperature. Cruise mode can be canceled by pressing the F2/Down button again. 3.6 Magneto check function Press the F2/Down button once you have reached your normal run-up RPM. The display will show the RPM deviation from when the magneto function was activated. Any RPM drops will be displayed as a negative RPM value, a positive reading indicates an increase in RPM. Switch the mag to left or right. The EMS-1 should display a negative (drop in) RPM. Then switch the mags to “Both”. The EMS-1 reading should go back to zero or near zero. A problem should show up as an excessive drop in one mag and the return to zero or close to zero incorrectly. The EMS-1 will return to the normal display after 60 seconds or if any key is pressed. 3.7 Start / Stop flight display Press the F1/Up button during the normal display mode to manually start/stop a flight. This key is only active if the EMS-1 is setup to select the manual flight option under the “TIMERS” setup menu. Vega EMS-1 Operating Manual Page 9 4 Menu System Press the rotary control button during the normal display mode to enter the menu system. Use the rotary control to navigate through the menu system. Vega EMS-1 Operating Manual Page 10 4.1 Exiting the menu system Press the F1/Up button to exit the menu system when the “EXIT” soft key is shown. All changes made during navigation of the menu system will be saved in non-volatile memory upon exiting. The instrument will not save any changes if you remove power before exiting the menu system. 4.2 Flight Timer View Flight Log: Use the rotary control to view the next flight log entry. Erase Flight Log: Use this function to erase the flight log stored in the EMS-1. FLIGHT: Select whether you want the EMS-1 to automatically detect a flight or whether the pilot must press the F1/Up button to start/stop a flight. We recommend you select automatic flight detection either on RPM1 or RPM2. T/O RPM: This menu option is only shown if the “RPM1” or "RPM2" flight mode is selected. Enter the RPM take off threshold that you want the flight timer to start incrementing. Vega EMS-1 Operating Manual Page 11 4.3 RPM 1 Setup menu option Display: Select if you want the RPM to be displayed in “RPM”, “PERCENT” or “OFF”. RPM 100%: Select the maximum value that you want the RPM to correlate to 100%. This is only shown if “Percent” is selected for display. Display Max: Select the maximum RPM that you want the RPM dial to show. This can give you increased display resolution. Display Min: Select the minimum RPM that you want the RPM dial to show. This can give you increased display resolution. High Alarm: This enables or disables the RPM high alarm. High Alarm: Enter the RPM threshold for when the high alarm must be activated. Any RPM value above this value will activate the alarm. High Caution: Enter the RPM value for the high caution. This is the lower value of the upper yellow band. Low Caution: Enter the RPM value for the low caution. This is the upper value of the lower yellow band. Vega EMS-1 Operating Manual Page 12 Low Alarm: This enables or disables the RPM low alarm. Low Alarm: Enter the RPM threshold for when the low alarm must be activated. Any RPM value below this value will activate the alarm. Pulses/Rev: Enter the number of pulses per RPM. For engines with an uneven number of cylinders like three cylinder four stroke engines you can enter values containing fractions (usually 1.5 in this example). Most four stroke engines would generate one pulse for every two revolutions per cylinder. A four cylinder automotive four stroke engine would thus generate 2 pulses per revolution. A typical Rotax DCDI two stroke engine would generate 6 pulses per revolution. The well known Rotax 912/914 engine generates one pulse per revolution. Increment: Select the step size between successive RPM values eg. if the RPM value is 4003 RPM and the “RPM INCREMENT” is 5 then the actual value shown is 4005 RPM. Label: Enter a label to suit your channel so you can identify it easily. Data: Select the data source of the RPM signals. Options include internal (using the internal electronics within the EMS-1) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the RDAC unit. Vega EMS-1 Operating Manual Page 13 4.4 RPM 2 / Fuel Flow Setup menu option The RPM-2 input can be used for RPM or fuel flow. If RPM is selected for “MODE” Mode: Select if you want to display “RPM2” or “FUEL FLOW” or “OFF” Display: Select if you want the RPM to be displayed in “RPM”, “PERCENT” or “OFF”. RPM 100%: Select the maximum value that you want the RPM to correlate to 100%. This is only shown if “Percent” is selected for display. Display Max: Select the maximum RPM that you want the RPM dial to show. This can give you increased display resolution. Display Min: Select the minimum RPM that you want the RPM dial to show. This can give you increased display resolution. High Alarm: This enables or disables the RPM high alarm. High Alarm: Enter the RPM threshold for when the high alarm must be activated. Any RPM value above this value will activate the alarm. Vega EMS-1 Operating Manual Page 14 High Caution: Enter the RPM value for the high caution. This is the lower value of the upper yellow band. Low Caution: Enter the RPM value for the low caution. This is the upper value of the lower yellow band. Low Alarm: This enables or disables the RPM low alarm. Low Alarm: Enter the RPM threshold for when the low alarm must be activated. Any RPM value below this value will activate the alarm. Pulses/Rev: Enter the number of pulses per RPM. For engines with an uneven number of cylinders like three cylinder four stroke engines you can enter values containing fractions (usually 1.5 in this example). Most four stroke engines would generate one pulse for every two revolutions per cylinder. A four cylinder automotive four stroke engine would thus generate 2 pulses per revolution. A typical Rotax DCDI two stroke engine would generate 6 pulses per revolution. The well known Rotax 912/914 engine generates one pulse per revolution. Increment: Select the step size between successive RPM values eg. if the RPM value is 4003 RPM and the “RPM INCREMENT” is 5 then the actual value shown is 4005 RPM. Label: Enter a label to suit your channel so you can identify it easily. Data: Select the data source of the RPM signals. Options include internal (using the internal electronics within the EMS-1) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the RDAC unit. If Fuel Flow is selected for “MODE” Mode: Select if you want to display “RPM2” or “FUEL FLOW” or “OFF” Unit: Select if you want fuel flow displayed in L/Hr or G/Hr Vega EMS-1 Operating Manual Page 15 Label: Enter a label to suit your fuel flow input so you can identify it easily. K-Factor: The K-Factor is the number of pulses generated by the fuel flow sender for one Litre of fuel. The dual range fuel flow sender supplied by MGL Avionics has a K-Factor of 7000 in the low flow mode (jet installed) and 1330 for the high flow mode (no jet installed). You can use the K-Factor to calibrate your fuel flow sender. See the installation section for more details on how to calibrate and install the fuel flow sender. Mode: Select if you want to measure fuel flow using a fuel flow sender or by using fuel injectors. Injector: Select whether the EMS-1 fuel flow input is connected to the high or low side fired fuel injector. Data: Select the data source of the RPM signals. Options include internal (using the internal electronics within the EMS-1) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the RDAC unit. Vega EMS-1 Operating Manual Page 16 4.5 EGT / CHT Setup (Thermocouple Setup) EGT / CHT Channels: Select the number of EGT or CHT channels you want to use. Choices are from 1 to 4 (1 to 12 if using the optional RDAC) . The temperature display will configure itself to make best possible use of the available display size. Please note that the minimum number of EGT & CHT channels that can be displayed is 1 and the maximum number of EGT and CHT channels that can be displayed is 4 (12 if using the optional RDAC). Display: A selection between “HIGHEST” or “SCANNING” can be selected. If “HIGHEST“ is selected then the current highest thermocouple temperature is displayed. If “SCANNING” is selected then the unit will cycle through each thermocouple at a one second interval. Display Max: Select the maximum temperature that you want the EGT/CHT bargraph to show. This can give you increased display resolution. Display Min: Select the minimum temperature that you want the EGT/CHT bargraph to show. This can give you increased display resolution. High Alarm: This enables or disables the EGT/CHT high alarm. High Alarm: Enter the temperature threshold for when the high alarm must be activated. Any temperature above this value will activate the alarm. Vega EMS-1 Operating Manual Page 17 High Caution: Enter the temperature value for the high caution. Probe: Select if you are using a K-type, J-type or E-type thermocouple probe for this channel. All probes supplied by MGL Avionics are K-Type. J-types are sometimes used with American made CHT probes. All EGT probes are K-type. E-type probes are seldom used. Temp Unit: Select whether you want the temperature to be displayed in degrees Celsius (ºC) or degrees Fahrenheit (ºF). Data: Select the data source of the themocouples. Options include internal (using the internal thermocouple amplifier and Vega connector) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the external RDAC unit. 4.5.1 Special Rotax 912/914 probe mode In this mode the Analog Channel 3 and Analog Channel 4 (or RDAC AUX 1 and AUX 2 analog input channels) become the Rotax CHT channel 1 and CHT channel 2 respectively. All CHT setups must still be done under the “CHT SETUP” menu. Vega EMS-1 Operating Manual Page 18 4.6 Analog CH1 to CH4 Setup The 4 analog channels are universal analog input channels that can be used for pressure, temperature or current. Only “CHANNEL 1” Setup is shown below, follow the same steps for Channel 2, 3 & 4 4.6.1 Pressure Setup Mode: Select the function for the analog channel. Options are “PRESSURE”, “TEMP”, “CURRENT” or “OFF”. Type: Select if you are using a resistive, voltage or current pressure sender. If the “RESISTIVE” pressure sender is selected Sender: Select what type of resistive pressure sender you are using. Select “VDO” for VDO / resistive senders, “USER” for a custom sender. Model: Select which VDO pressure sender you are using. A selection between a VDO 2, 5 or 10 Bar can be selected. Vega EMS-1 Operating Manual Page 19 If the “VOLTAGE” pressure sender is selected Sender: Select the type of voltage sender you are using. Select “UMA” for UMA senders, "0.5-4.5V" for voltage senders, or “USER” for a custom voltage sender. Model: For UMA senders select the UMA model number. If the “CURRENT” pressure sender is selected Sender: Select the type of current sender you are using. Select “4-20mA” for Rotax 912/914 4-20mA sender or “USER” for a custom 4-20mA sender. Pressure @ 4mA: Enter the pressure specified at 4mA output. Pressure @ 20mA: Enter the pressure specified at 20mA output. Menu options for all sender types If the “USER" pressure sender is selected Calibrate Sender: If the sender type is set to “USER”, then use this menu option to calibrate your pressure sender. See section 4.2.3 for more information. Label: Enter a label to suit your pressure channel so you can identify it easily. Unit: Select whether you want to display the pressure in Bar, psi or psi(0.1). The psi(0.1) is for low range pressure senders e.g. UMA 7PSI. Display Max: Select the maximum pressure that you want the bargraph to show. This can give you increased display resolution. Display Max: Select the minimum pressure that you want the bargraph to show. This can give you increased display resolution. High Alarm: This enables or disables the pressure high alarm. High Alarm: Enter the pressure threshold for when the high alarm must be activated. Any pressure above this value will activate the alarm. High Caution: Enter the pressure value for the high caution. This is the lower value of the upper yellow band. Vega EMS-1 Operating Manual Page 20 Low Caution: Enter the pressure value for the low caution. This is the upper value of the lower yellow band. Low Alarm: This enables or disables the pressure low alarm. Low Alarm: Enter the pressure threshold for when the low alarm must be activated. Any pressure below this value will activate the alarm. Data: Select the data source of the pressure signal. Options include internal (using one of the analog channels within the EMS1) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the RDAC unit. 4.6.2 Temperature Setup Mode: Select the function for the analog channel. Options are “PRESSURE”, “TEMP”, “CURRENT” or “OFF”. Sender: Select what type of sender you are using. Select “VDO 120” for a VDO 120 degree NTC sender, Select “VDO 150” for a VDO 150 degree NTC sender, “WESTACH” for Westach 339 NTC sender, “MGL” for a MGL NTC sender, “LM335” for a MGL precision temperature sender or “USER” for a custom sender. If the sender type is set to “USER" CALIBRATE SENDER: If the sender type is set to “USER”, then use this menu option to calibrate your pressure sender. See section 4.2.3 for more information. Vega EMS-1 Operating Manual Page 21 If the sender type is set to “LM335" LM335: If the sender type is set to LM335, then use this menu option to calibrate your LM335 precision temperature sender. If recalibration is required then adjust the value until the temperature matches the reference ambient temperature. Please note that the LM335 can only be calibrated in degrees Celsius irrespective if the EMS-1 is setup to display temperature in Fahrenheit. Menu options for all sender types Label: Enter a label to suit your temperature channel so you can identify it easily. Temp Unit: Select whether you want the temperature to be displayed in degrees Celcius (ºC) or in degrees Fahrenheit (ºF). Display Max: Select the maximum temperature that you want the bargraph to show. This can give you increased display resolution. Display Min: Select the minimum temperature that you want the bargraph to show. This can give you increased display resolution. High Alarm: This enables or disables the temperature high alarm. High Alarm: Enter the temperature threshold for when the high alarm must be activated. Any temperature above this value will activate the alarm. High Caution: Enter the temperature value for the high caution. This is the lower value of the upper yellow band. Low Caution: Enter the temperature value for the low caution. This is the upper value of the lower yellow band. Low Alarm: This enables or disables the temperature low alarm. Low Alarm: Enter the temperature threshold for when the low alarm must be activated. Any temperature below this value will activate the alarm. Data: Select the data source of the temperature signal. Options include internal (using one of the analog channels within the EMS-1) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the RDAC unit. Vega EMS-1 Operating Manual Page 22 4.6.3 Calibrating the user defined pressure,temperature and current senders 1. Enter the number of points that you want to calibrate. 2. Enter the display reading that you want to show when the sender is at that actual display reading. 3. Enter the ADC (analog to digital converter) reading that corresponds to this display reading. The ADC reading is shown at the top of the display if you are applying the actual stimulus from the temperature, pressure or current sender. You can also manually enter this value if the ADC value is known or pre-calculated. 4. Continue entering display and ADC values until all the points have been entered. 5. Verify the above calibration by checking the temperature, pressure or current display versus the actual applied sender stimulus. 4.6.4 Current Setup (requires a MGL Avionics Closed Loop Current Sensor) Mode: Select the function for the analog channel. Options are “PRESSURE”, “TEMP”, “CURRENT” or “OFF”. Label: Enter a label to suit your current channel so you can identify it easily. Display Max: Select the maximum current that you want the bargraph to show. This can give you increased display resolution. Display Min: Select the minimum current that you want the bargraph to show. This can give you increased display resolution. High Alarm: This enables or disables the current high alarm. High Alarm: Enter the current threshold for when the high alarm must be activated. Any current above this value will activate the alarm. Vega EMS-1 Operating Manual Page 23 High Caution: Enter the current value for the high caution. This is the lower value of the upper yellow band. Low Caution: Enter the current value for the low caution. This is the upper value of the lower yellow band. Low Alarm: This enables or disables the current low alarm. Low Alarm: Enter the current threshold for when the low alarm must be activated. Any current below this value will activate the alarm. Zero Sensor: Select this function to indicate to the EMS-1 that zero current is flowing through the MGL Avionics Closed Loop Current sensor. This is best done with the MGL Closed Loop Current sensor disconnected from the main current supplying conductor. Gain: Adjust the gain factor until the current is reading correctly. It will be best if a multimeter can be inserted in series with the current supplying conductor and the gain calibration adjusted until the EMS-1 matches that of the multimeter. Please see the MGL Avionics Closed Loop Current Sensor documentation for more information. Data: Select the data source of the current signal. Options include internal (using one of the analog channels within the EMS-1) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the RDAC unit. 4.6.5 Fuel Level Setup Vega EMS-1 Operating Manual Page 24 Mode: Select the function for the analog channel. Options are “PRESSURE”, “TEMP”, “CURRENT”, “FUEL LEVEL” or “OFF”. Label: Enter a label to suit your fuel level channel so you can identify it easily. Unit: Select whether you want the fuel level to be displayed in Litres or in Gallons. Litre Res: Select the resolution of the Litre unit. 1L or 0.1L Tank Size: Enter the size of the fuel tank in your system. It is recommended to choose a size that is slightly less than actual size so you can compensate for sender inaccuracies and give you a measure of reserve fuel. Low Alarm: Enter your desired minimum fuel value that you would like to trigger the fuel low alarm. The fuel low alarm will result in the flashing of the fuel level display and remaining fuel readout. You can also connect a warning lamp to the external alarm output (see installation diagram). Note that the fuel low level will be displayed as a red bar on your fuel level display. This level is over and above your “silent” fuel reserve. Low Caution: Enter the fuel level value for your fuel caution. Note that the fuel caution level will be displayed as a yellow bar on your fuel level display. Low Alarm: Select whether to turn the fuel tank 1 low level alarm on or off. Calibrate Tank: See section 4.5.5.1 on how to calibrate the fuel level senders. Tank Filter: Select the damping factor for the fuel level. A selection of none, low, med or high can be made. Data: Select the data source of the current signal. Options include internal (using one of the analog channels within the EMS-1) or from an optional external RDAC unit. RDAC Address: Select the CAN address of the RDAC unit. Vega EMS-1 Operating Manual Page 25 4.6.5.1 Calibrating the fuel level senders The fuel level sender needs to be calibrated before it can be used with this system. The calibration allows the system to learn the shape of your tank as well as any errors your fuel level sender or installation has. Regardless of your use of a fuel flow sender, you can install a fuel level sender into your fuel tank. These level senders are inexpensive and are available as after market replacement fittings from a car spares outlet. We recommend the senders available from VDO. Be aware that some makes of cheap level senders can prove troublesome, as the lever arms tend to be sticky. This prevents the floats from floating on the surface of the fuel at all times. As a consequence, this will lead to incorrect fuel level indication. Adjusting calibration points automatically Select “SENDER” for the mode menu item. Once you have installed a fuel level sender into your tank, make sure the float can travel all the way from empty to full position without hindrance of any kind. The calibration procedure should be carried out with your aircraft in flight attitude. This means you need to lift the tail if you have a tail-dragger or lift the nose wheel if you have a weight shift trike. Calibration procedure Start the calibration procedure with an empty tank. Add five Litres of fuel (our reserve quantity) using a suitable measure. Make sure the measure is suitably accurate. This is now the “level sender reading at 0 Lt” position. Move the highlight to this position and wait until the sender reading has stabilized (You will see the sender ADC reading at the top). This could take up to a minute so have patience. ENSURE THAT THE FLOAT IS NOT SUBMERGED AND IS FLOATING ON TOP OF THE FUEL LEVEL. Should this number not react to changes of your level sender position, then you have a problem. Please check your wiring according to the installation section of this manual. You should expect the number to change in the region of at least 20 to 60 counts per calibration position. If the number does not change with fuel level or only changes a very small amount – check your installation. Something is not right! • If you see the number changing then everything is well. Once it has stabilized and the highlight is on the 0 L position, press the rotary control to transfer the reading from the sender to the calibration point. • Now you are ready for the next step. Add the required amount of fuel to get to the next level (In our case 9 Lt – this is 20% tank capacity). Once done, wait for the reading to stabilize and press the rotary control again after you have moved the highlight to the “9 L” position. • Proceed in a similar manner until you have reached the last calibration position at 100% tank capacity. You are done! To finish your calibration, exit the calibration function. The instrument uses the 6 calibration points to work out a correction curve that takes into account the tolerances of your fuel level sender and the shape of your fuel tank. This results in an incredibly accurate and usable fuel level display that far exceeds that available from ordinary dial type gauges. Vega EMS-1 Operating Manual Page 26 Adjusting calibration points manually You may want to set individual calibration points manually. For example you may find that your fuel level is over reading at a specific fuel level. Correcting the tank level reading for this area can be simply done by adjusting the calibration point. You can do this by moving the float level with your hands to the desired position and then performing the calibration as outlined above, or you can use the manual option. Select “MANUAL” for the mode menu item. Then highlight the point you want to change manually and press the rotary control. Use the up or down keys or the rotary control to adjust the value. Press the rotary control when done. Note: The calibration positions may be edited by using the rotary control. This allows you, in theory, to copy calibration settings from one instrument to another. We however recommend that you do go though the calibration procedure even if the two aircraft are identical in all respects. Tolerances do exist and the calibration cancels these out. Accurate fuel level displays are a vital safety factor for an aircraft and a very useful feature for peace of mind during cross county flights. Notes on Slope error Sender value is a value determined by the EMS-1. It is used to calculate fuel level, fuel endurance estimate and current range estimate. The fuel tank setup sender value can e ither increase in value as fuel is added or decrease in value if fuel is added. This is dependent on the type of fuel level sender used. However should the second reading be l arger than the first reading all readings will have to be larger than the previous readings. Likewise should the second reading be smaller than the first reading all readings will have to be smaller than the previous reading. If this is not the case the wording "Slope error" will be displayed. This could happen when fuel was removed instead of added between steps, no fuel was added between steps or when the fuel level sender was moved in the wrong direction e.g. moving the fuel level sender manually when it is not inserted in to the fuel tank. Determine the cause of the error if you should get a slope error message. If you do not know the cause of your error it is best to start from scratch. It should be remembered that accuracy in the fuel tank calibration is extremely important to enable your EMS-1 to display the correct data. Vega EMS-1 Operating Manual Page 27 4.7 Volts Setup Display: Select is you want the Volts to be displayed as a numeric only value at the top of the display or if you want to have it displayed as a bargraph. Select “OFF” to disable the volts display. Label: Enter a label to easily identify your Volts reading. Display Max: Select the maximum value that you want the volts bargraph to show. This can give you increased display resolution. The bargraph is only shown if the current display is disabled. Display Min: Select the minimum value that you want the volts bargraph to show. This can give you increased display resolution. The bargraph is only shown if the current display is disabled. High Alarm: This enables or disables the volts high alarm. High Alarm: Enter the voltage threshold for when the high alarm must be activated. Any voltage above this value will activate the alarm. High Caution: Enter the voltage for the high caution. This is the lower value of the upper yellow band. Low Caution: Enter the voltage for the low caution. This is the upper value of the lower yellow band. Vega EMS-1 Operating Manual Page 28 Low Alarm: This enables or disables the volts low alarm. Low Alarm: Enter the voltage threshold for when the low alarm must be activated. Any voltage below this value will activate the alarm. Cal: Measure the battery voltage with a multimeter and then adjust this value to match that of the multimeters volts reading. Vega EMS-1 Operating Manual Page 29 4.8 MAP Setup (Manifold Setup) Display: Select is you want the MAP to be displayed as a numeric only value at the top of the display or if you want to have it displayed as a bargraph. Select “OFF” to disable the MAP display. Label: Enter a label to easily identify your MAP reading. MAP Unit: Select if you want the manifold pressure displayed in mB (millibars) or “Hg (inches of mercury). Display Max: Select the maximum pressure that you want the manifold bargraph to show. This can give you increased display resolution. Display Min: Select the minimum pressure that you want the manifold bargraph dial to show. This can give you increased display resolution. High Alarm: This enables or disables the manifold pressure high alarm. High Alarm: Enter the pressure threshold for when the high alarm must be activated. Any pressure above this value will activate the alarm. High Caution: Enter the pressure value for the high caution. This is the lower value of the upper yellow band. Vega EMS-1 Operating Manual Page 30 Low Caution: Enter the pressure value for the low caution. This is the upper value of the lower yellow band. Low Alarm: This enables or disables the manifold pressure low alarm. Low Alarm: Enter the pressure threshold for when the low alarm must be activated. Any pressure below this value will activate the alarm. Filter: This function can be used to select the signal filter time constant. Selections are "NONE", “FAST” or “SLOW”. This selection influences the rate at which your manifold pressure can change its reading. Cal: The sender in the RDAC is shipped uncalibrated. To calibrate the manifold pressure, compare and adjust the calibration factor until the manifold reading is the same as the barometic pressure. The manifold pressure can only be calibrated in mB. RDAC Address: Select the CAN address of the RDAC unit. Vega EMS-1 Operating Manual Page 31 4.9 Current Setup (MGL Avionics Closed Loop Current Sensor and RDAC required) Display: Select to enable or disable the RDAC current display. Label: Enter a label to easily identify your Current reading. High Alarm: This enables or disables the current high alarm. High Alarm: Enter the current threshold for when the high alarm must be activated. Any current above this value will activate the alarm. High Caution: Enter the current value for the high caution. Low Caution: Enter the current value for the low caution. Low Alarm: This enables or disables the current low alarm. Low Alarm: Enter the current threshold for when the low alarm must be activated. Any current below this value will activate the alarm. Vega EMS-1 Operating Manual Page 32 Zero Sensor: Select this function to indicate to the EMS-1 that zero current is flowing through the MGL Avionics Closed Loop Current sensor. This is best done with the MGL Closed Loop Current sensor disconnected from the main current supplying conductor. Gain: Adjust the gain factor until the current is reading correctly. It will be best if a multimeter can be inserted in series with the current supplying conductor and the gain calibration adjusted until the EMS-1 matches that of the multimeter. Please see the MGL Avionics Closed Loop Current Sensor documentation for more information. RDAC Address: Select the CAN address of the RDAC unit. Vega EMS-1 Operating Manual Page 33 4.10 Timers Setup Set UTC Time: This function is used to set the internal real time clock. The time to be entered must be UTC in order for the system to operate correctly. Do not enter local time (unless it is the same as UTC). UTC is the same as Greenwich Mean Time (GMT) or Zulu time. UTC Offset: Enter the UTC offset for your location. The UTC offset can be adjusted in half an hour increments. RTC Trim: This allows you to adjust a trimming factor that will increase the accuracy of the built in clock. SET HOBBS TIME: This function allows you to set the engine Hobbs meter to any value. Typically, you would use this function to set the Hobbs meter to the current known engine time. Use the rotary control to change the value. Press the rotary control to accept and exit the menu option. If the Hobbs code is set to another value beside zero, then the pilot will be prompted to enter the Hobbs access code before allowing him to change the Hobbs time. This feature is useful for charted and flying school planes. Vega EMS-1 Operating Manual Page 34 HOBBS CODE: This menu option allows you to change the Hobbs access code. You will first be prompted to enter the current code followed by entering in a new code followed by re-entering the new code. If the new code and the re-entered code is the same, then the Hobbs access code will be changed. Default code is 0000. SET MAINT TIMER: This function allows you to set an engine maintenance timer. This timer is set in engine hours and it will count down to zero when the engine RPM is greater then the “HOBBS RPM”. A good use for this function is to set the hours until your next spark plug change or engine inspection. Use the rotary control to change the value. H/M Start: Select what source will start the Hobbs and Maintenance timers. A selection between Power, RPM 1 or RPM 2 can be made HOBBS RPM: Enter the RPM limit in which the Hobbs timer/Maintenance timer must start incrementing. Vega EMS-1 Operating Manual Page 35 4.11 ECU Setup (Engine Control Unit) Type: Select the ECU that is connected to the EMS-2. Select “NONE” for standard EMS-2 functionality or “UL POWER” for UL Power engines. 4.11.1 UL Power ECU Connect the UL Power Engine to the EMS-2 using the RS232 port. ECU/AIR TEMP (UL Power ECU only): Select whether you want the temperature to be displayed in degrees Celcius (ºC) or in degrees Fahrenheit (ºF). UL Power display screen A dedicated display screen will be shown when the UL Power is selected for the ECU type. Ignition 1 Indicator Green = On Red = Off Ignition 2 Indicator Green = On Red = Off RPM Fuel Flow Alternating display area EGT Display CHT display Vega EMS-1 Operating Manual Page 36 Alternating Display Area Oil pressure, Oil Temperature, Fuel Pressure, OAT, Throttle position, ECU temperature, air temperature, Volts and optional current is displayed here. Warning Messages from the UL Power ECU UL Power ECU Oil Pressure is mapped to the EMS-2 Analog CH 1, UL Power ECU Oil Temperature to the EMS-2 Analog CH 2 and the UL Power ECU Fuel Pressure to the EMS-2 Analog CH3. These channels need to be setup accordingly. The MGL Avionics RDAC can be used to measure CHT, EGT and MAP. The EMS2 also supports the UL Power Aux box UL Power recommended settings: Oil Pressure : max 8 bar (115psi) - normal 2 to 5 bar (30 – 75 psi) above 2000rpm - minimum 0.7 bar Oil Temperature: Max 120°C (248°F) - Min 50°C (122°F) - Normal between 80°C and 100 °C (175°F – 212°F) Fuel Pressure: max 3.8 bar (55psi) - normal 3 bar (43,5 psi) - minimum 2.4 bar (35 psi) Map: Max 1.1 bar (33 inch/kg) – Min. 0.3 bar (9 inch/kg) EGT: max 860°C (1580°F) - Min. 400°C (700°F) - Normal between 700°C and 800°C (129°F – 1470°F) CHT: max 180°C (356F°) - Max. continuous 160°C (320°F) - Min. 50°C (125°F) Vega EMS-1 Operating Manual Page 37 4.12 COMM Setup (Communication Setup) Serial Out: Select “ON” to enable the RS232 serial output. Unit Address: Enter the EMS-1 unit address. Baud Rate: Select the desired baud rate of the serial output. The transmission format is set to 8 data bits, No parity, 1 stop bit. The baud rate can be changed in the Communication Menu. 4.12.1 Protocol Format STX, Address, Message type, Length, Data payload, Checksum, ETX STX: Start of text (0x02) Address: unsigned char (8bit), Unit address (range 0-255) Message Type: unsigned char (8bit), Specifies the message type Length: unsigned char (8bit), Length of the data payload (does not include the STX, Address, message type, checksum or ETX) Data payload: Data Checksum: unsigned char (8bit), XOR of all bytes starting from the unit address to the end of the data payload. The checksum is seeded with 0xa5. (does not include the STX or ETX) ETX: End of text (0x03) Vega EMS-1 Operating Manual 4.12.2 Data payload Message type=1 Data Length=69 bytes Output Rate=1Hz Unused channels will read 0 Local Time: Unsigned Long (32 bit), Time is seconds since 1 January 1970 Hobbs Hours: Unsigned Int (16 bits), Hobbs hours Hobbs Minutes: Unsigned char (8 bits), Hobbs decimal minutes Maintenance Time: Unsigned Int (16 bits), Maintenance time in hours Volts: Unsigned Int (16 bits), Volts in 0.1V RPM 1: Unsigned Long (32 bit), RPM 1 value RPM 1 (%): Unsigned Int (16 bit), RPM 1 value in percentage RPM 2: Unsigned Long (32 bit), RPM 2 value RPM 2 (%): Unsigned Int (16 bit), RPM 2 value in percentage Analog Channel Type: Unsigned Int (16 bits) CH4 (4 bits), CH3 (4 bits), CH2 (4 bits), CH1 (4 bits) 0=Off 1=Pressure 2=Temperature 3=Current 4=Fuel Level Analog Channel 1: Signed Int (16 bits) Pressure in 0.1psi Temperature in Degrees C Current in 0.1A Fuel Level in Liters Analog Channel 2: Signed Int (16 bits) Pressure in 0.1psi Temperature in Degrees C Current in 0.1A Fuel Level in Liters Analog Channel 3: Signed Int (16 bits) Pressure in 0.1psi Temperature in Degrees C Current in 0.1A Fuel Level in Liters Analog Channel 4: Signed Int (16 bits) Pressure in 0.1psi Page 38 Vega EMS-1 Operating Manual Temperature in Degrees C Current in 0.1A Fuel Level in Liters Manifold Pressure: Signed Int (16 bits), Manifold pressure in mBar Current: Signed Int (16 bits), Current in 0.1A CJC: Signed Int (16 bit), Cold junction temperature in Degrees Celsius TC1: Signed Int (16 bit), Thermocouple channel 1 in Degrees Celsius TC2: Signed Int (16 bit), Thermocouple channel 2 in Degrees Celsius TC3: Signed Int (16 bit), Thermocouple channel 3 in Degrees Celsius TC4: Signed Int (16 bit), Thermocouple channel 4 in Degrees Celsius TC5: Signed Int (16 bit), Thermocouple channel 5 in Degrees Celsius TC6: Signed Int (16 bit), Thermocouple channel 6 in Degrees Celsius TC7: Signed Int (16 bit), Thermocouple channel 7 in Degrees Celsius TC8: Signed Int (16 bit), Thermocouple channel 8 in Degrees Celsius TC9: Signed Int (16 bit), Thermocouple channel 9 in Degrees Celsius TC10: Signed Int (16 bit), Thermocouple channel 10 in Degrees Celsius TC11: Signed Int (16 bit), Thermocouple channel 11 in Degrees Celsius TC12: Signed Int (16 bit), Thermocouple channel 12 in Degrees Celsius Fuel flow: Unsigned Int (16 bits), Fuel Flow in 0.1Liters per Hour Page 39 Vega EMS-1 Operating Manual 4.13 MISC Setup (Miscellaneous Setup) Backlight: Select this menu option to adjust the backlight brightness. Security Setup: Select this menu option if you want to password protect the menu system. Information: This menu option displays information about the unit. Page 40 Vega EMS-1 Operating Manual Page 41 Default Settings: Select this menu option to reset all the settings to factory defaults. 4.14 ADC Values This menu displays the ADC values of the various sensors. 5 Loading factory default settings Press and hold the F1/Up button and rotary control during power up to load the preprogrammed factory default settings. The following screen will be displayed: Factory default settings can also be loaded in the Miscellaneous setup menu. Vega EMS-1 Operating Manual Page 42 6 Error Messages Unit settings CRC error. Load default settings to restore to factory defaults. If the error message still persists then it could possibly be a non-volatile memory failure in which case the instrument will then have to be returned to the factory. Internal flash CRC error. The instrument does a firmware check on the program when power is applied to the instrument . If the program is corrupt in any way then the internal flash CRC error will be displayed. Reload the instruments firmware and load default settings. If the error message still persists then it could possibly be an internal flash memory failure in which case the instrument will then have to be returned to the factory. Hobbs / Maintenance Timer CRC error. Try entering new values for the Hobbs meter and Maintenance timer and see if the error message disappears. If the error message still persists then it could possibly be a non-volatile memory failure in which case the instrument will then have to be returned to the factory. Calibration constants CRC error. The instrument could possibly have a non-volatile memory failure in which case the instrument will then have to be returned to the factory. Max Values CRC error. Load default settings to restore to factory defaults. If the error message still persists then it could possibly be a non-volatile memory failure in which case the instrument will then have to be returned to the factory. The red cross over the display means the EMS-1 has lost communications with the external RDAC unit. Check the wiring between the EMS-1 instrument and the RDAC unit. This error message is only available when the external RDAC is selected as the data source. Vega EMS-1 Operating Manual Page 43 7 Specifications Operating Temperature Range Storage Temperature Range Humidity Power Supply Current Consumption Display Alarm Output ADC Dimensions Enclosure Weight Non-volatile memory storage -10ºC to 60ºC (14ºF to 140ºF) -20ºC to 80ºC (-4ºF to 176ºF) <85% non-condensing 8 to 30Vdc Approx. 80mA @ 13.8V (backlight highest setting), 36mA @13.8V (backlight lowest setting) 1.8” 160x128 pixel active matrix TFT display. 1000 cd/m2 Sunlight readable with anti-glare coating LED Backlight is user configurable Open collector transistor switch to ground Maximum rating 0.25A 12 bit see Vega series dimensional drawing 2 1/4” (57mm) ABS, black in color, front or rear mounting. Flame retardant. Approx. 120 grams (Instrument excluding cables) 100000 write cycles RPM Inputs RPM input 1 RPM input 2 Sensor Output Voltage Range: 0-99999 RPM. Minimum signal for stable display: 5Vpp. Fully A/C coupled, maximum voltage +/- 40V. RF noise filter plus Schmitt trigger based input Range: 0-99999 RPM. TTL level input Required input voltage swing: less than 1.5V to more than 3.5V. Maximum input voltage range -5V to +18V RF noise filter and Schmitt-trigger based input. +5Vdc. Max 50mA Fuel Flow Input Sensor Output Voltage RF noise filter plus Schmitt trigger based input External pull up resistor may be required +5Vdc. Max 50mA Type J-type, K-type and E-Type Measurement range EMS-1 Internal amplifier K-Type: -100ºC to 1200ºC (-148ºF to 2192ºF) J-Type: -100ºC to 1100ºC (-148ºF to 2012ºF) E-Type: -100ºC to 800ºC (-148ºF to 1472ºF) Fuel Flow input Thermocouples Technology Measurement accuracy Inputs Common mode voltage range Channels Fully cold junction compensated using a precision internal temperature reference and built in thermocouple linearization tables +/- 5 degrees typical over full temperature range, subject to quality of probe used. We recommend MGL Avionics EGT and CHT probes Differential, can use grounded and isolated probes -2V to +3V 4 using the internal electronics, 12 using the optional external RDAC Analog Input Channels Analog Input Channels 4 Total. 3 (With dipswitch programmable pullup resistor), 1(With fixed pull up resistor) Vega EMS-1 Operating Manual Page 44 Pressure Sender Input VDO Resistive Sender: The EMS-1 supports the VDO 2, 5 and 10 Bar senders. VDO pressure senders used to measure fuel pressure require the fuel isolation kit available from VDO. Rotax 4-20mA Sender: The EMS-1 supports the 4-20mA pressure sender as used in Rotax 912/914 engines. Voltage Output Pressure Senders: e.g. UMA senders that output a voltage signal. A 0.5-4.5V sender selection is also available. Pressure Sensors UMA N/T 1EU07G(M): 7PSI (0.5Bar) for carburated engine (Rotax) UMA N/T 1EU35G(M): 35PSI (2.4Bar) for carburated engine (Lycoming/Continental) UMA N/T 1EU100G(M): 100PSI (6.9Bar) for injected (Lycoming / Continental) (M) is MGL modified senders The EMS-1 includes linearisation curves for the UMA N/T 1EU07, N/T 1EU35, N/T 1EU70, N/T 1EU70A, N/T 1EU100 and N/T 1EU150 pressure senders User defined senders: EMS-1 has a user sender calibration feature that can be customized for senders not listed above. Temperature Sender Input VDO Resistive Senders: VDO 120ºC and VDO 150ºC thermistor senders supported. MGL NTC Resistive Sender: Echlin TS920SA (32040) automotive temperature sender Temperature Sensors MGL Precision LM335 semiconductor: Based on ON Semiconductors LM335 temperature sensor Westach Resistive Senders: Westach 399 thermistor series temperature senders. User defined senders: The EMS-1 has a user sender calibration feature that can be customized for senders not listed above Fuel Level Sender Input Fuel level input Fuel level senders supported Analog channel input pull up resistor Maximum voltage: 5V, 5mA maximum current Any resistive type with common ground and capacitive probes with active voltage outputs up to 5V level (push pull or pull up). The analog channel dip switch should be disabled and an external 1k resistor should be connected between the fuel level input and the +5V sensor power 1k5 (Can be disabled via the internal dip switches) Vega EMS-1 Operating Manual Page 45 Current Sensor Current Sensors MGL Avionics Closed Loop Current Sensor Voltage measurement range Voltage resolution Up to 32Vdc 0.1V OAT Temperature Sender type Semiconductor LM335 (ON Semiconductor) Internal battery type CR2032 Volts OAT Probe RTC 8 Operating the alarms The alarm output can be used to switch an external alarm indicator. The external alarm switch is an open collector transistor switch to ground with a maximum rating of 0.25A DC. It is possible to wire the alarm contacts of several Stratomaster instruments in parallel should this be desired. To avoid false activation of the alarms, the alarm function is only active 10 seconds after the instrument has powered up. 9 Firmware Upgrading The EMS-1 can be upgraded in the field by connecting the RS232 port to a PC and running the firmware update program. Note that only the RS232 port can be used to upgrade the firmware. Please see the Vega firmware upgrading document for more information. 10 Changing the internal battery The EMS-1 uses an internal Lithium battery to supply power to run the internal clock. If you find the EMS-1 looses time when you switch off main power you should replace the battery. This battery is of type CR2032. It is used in many calculators and similar equipment and is easy to obtain. Remove the 2 securing nuts next to the D-15 connector and remove the unit from its enclosure. The battery holder is located on the circuit board behind the display. Observe correct polarity when installing a new battery. The side marked “+” will be viewable once the battery is inserted. Vega EMS-1 Operating Manual Page 46 11 Installation 11.1 Connection Diagram The use of an external 1A fuse is recommended. Connect the supply terminals to your aircrafts power supply. The EMS-1 can be used on both 12V and 24V without the use of any pre-regulators. Ensure that the supply voltage will not drop below 8V during operation as this may result in incorrect readings. Vega EMS-1 Operating Manual Page 47 Please note: The +5V Sensor power output line is unprotected and intended only for the supply of a hall-effect, optical or gear tooth sensors. Connecting any voltages (such as the 12V supply) to this line could destroy the instrument. The +5V line may supply currents of up to 50mA. Should your sensor require greater currents you must supply it from another source. Please note: It is essential that a single wire be connected from the minus terminal of the instrument to the engine block. This wire must not be used to share currents with other electrical users as this can affect accuracy of readings. 11.2 EGT/CHT Installation The EMS-1 provides for up to 4 thermocouple inputs when using the internal eletronics and up 12 thermocouple inputs when using the optional external RDAC. K, J as well as E-type probes can be used. K types are used for EGT probes while CHT probes can either be J or K type. E-type probes are seldom used. Probe types are selected in the various “TC SETUP” menus of the EMS-1. Important: Incorrect selection of probe type will lead to an incorrect temperature display. The EMS-1 will accept both grounded and isolated thermocouple probes. Your only consideration in case of the more common grounded configurations is that you need to ensure that the thermocouple mounting position (exhaust flange, etc.) is at the same electrical potential as the negative supply line of the EMS-1. The thermocouple amplifier is a precision device providing full cold junction compensation. This results in very accurate measurements providing you install high quality probes. Here are some guidelines: EGT Probes: Select probes that are made from 316 stainless steel and that use glass-fiber insulated conductors. Teflon insulated conductors as found in many cheap probes introduce errors as the insulation melts moving the measuring point towards the mounting bolt which transfers a lot of heat to the exhaust material. This results in under reading probes. Stay away from probes that use simple plastic heat shrink sleeving – it does not last. Choose probes that use a generous amount of stainless steel spring as strain relief. The bolt itself should be stainless steel as well or it will rust very quickly. CHT Probes: These are made from washers to fit spark-plug bases. Temperatures are considerably lower so most thermocouple cables will work without problems. The biggest area of concern should be the connection of the thermocouple cable to the washer. This often breaks after the spark plug has been changed a few times. Choose a probe that is suitably reinforced at this point for a long and trouble free life. EGT and CHT probes supplied by MGL Avionics are of the highest quality. We recommend that you consider using our probes if at all possible. EGT and CHT probes use wire made from iron and other basic metals. As a result these probes are not able to withstand much flexing of the wires due to engine vibrations. Avoid making nice looking coils or similar constructions that will result in excessive vibration or flexing of the wire. Route the cables from the probe points tightly along suitable engine mounting points eliminating any chance of unnecessary wire flexing during engine operation. Warning: Four stroke engines produce much hotter exhaust gases compared to two stroke engines. Do not use EGT probes made from lower grade stainless steel (for example 310), these probes will not withstand the high temperatures and can fail as the metal gets very soft at 800 degrees C. Many four strokes (such as the Rotax 912) will produce exhaust gases of up to 850 degrees C. Vega EMS-1 Operating Manual Page 48 11.2.1 Extending the leads of thermocouple probes Thermocouple leads as used with the EGT and CHT probes can be extended either with ordinary copper cable or with special K-Type extension cable. The choice of either depends on your desired accuracy. If it is possible in your installation to ensure that both ends of a copper extension cable will be at the same temperature (or very close), then it is quite possible to use the copper cable. In most open-air installations this will be the case. Should this not be possible or you require best possible accuracy at all times, you can obtain a special K-type extension cable. This cable is made from the same metals as your probes cable and uses ordinary plastic sleeving as insulation. In either case, ensure that the cable is not routed close to sources of electromagnetic interference of any kind. The voltages present in this cable are very small and are subject to changes applied by external fields. This can lead to false temperature indications. You can check your installation by using a hand-held transmitter, such as an air band radio. If you transmit a signal, no change in temperature reading should occur. 11.2.2 Notes on thermocouple connections using the supplied harness For maximum accuracy of the thermocouple temperature measurement, please ensure that either end of the harness cable (where used for thermocouple probes) is at fairly even temperature (minimise the temperature difference between the connector side of the cable and the side where you connect the thermocouple). If required, shorten the cable to fulfil this need. Note: Always install EGT probes starting on Channel 1 followed by the CHT probes without skipping any channels in between. 11.3 RPM Installation The RPM 1 input is quite universal. The RPM 1 input can be used with signals from about 5Vpp to as much as 100Vpp. The input is also AC coupled for easy installation. A noise filter is included that results in the input ignoring any high frequency noise signals as long as this is below the detection threshold of about 2.5Vpp (Please see dipswitch settings below) The input impedance of the rev counter input is approximately 10Kohm. You can use series resistors as well as load resistors for applications that have unusual signals. The RPM 2 input is intended as a Rotor input or a RPM input from sensors that can output a TTL signal. A noise filter is included that results in the input ignoring any noise signals as long as this is below the detection threshold of about 1.5V. (Please see dipswitch settings below). The required input voltage swing must be less than 1.5V to more than 3.5V. The 220Ohm ballast resistor can be connected across the RPM input to ground to reduce noise or secondary pulses on the RPM line (This is often used with Rotax engines). The ballast resistor must not be inserted for direct magneto pickups as the magneto pulse may have low energy in particular at idle. After you have connected the RPM input terminals to the signal sources you will need to set the number of pulses per revolution under the “RPM SETUP” menus. The calibration itself depends on your engine and rotor type and what kind of signal you are using. Installation of the EMS-1 is quite straight forward in most cases. The drawing in section 10.1 shows a typical EMS-1 installation. Please see the engine RPM connection guide for connecting popular engine types to the EMS-1. 11.3.1 Adjusting RPM sensitivity (RPM 1 Input only) The EMS-1 has a sensitivity adjustment trimmer at the rear of the instrument. Adjust this trimmer using a small screwdriver such that you get stable RPM readings over the entire RPM band of your engine. If your sensitivity is too high, you may get unstable RPM readings (usually at higher RPM as electrical noise in the ignition system increases). If the sensitivity is too low the RPM reading may remain at zero. Fully clockwise = maximum sensitivity. Vega EMS-1 Operating Manual Page 49 11.3.2 RPM 1 Input Dipswitch settings Setting dipswitch 4 to the “ON” position (default) enables a high frequency filter in the RPM 1 signal path. Some installations (direct coupling to a Magneto device for example) will require this to be switched “OFF”. Dipswitch 4 is the closest switch to the edge of the PCB. 11.3.3 Engine RPM connection guide Engine Connection / Sensor Pulses per revolution 220 Ohm Ballast resistor Rotax 447 Connect the grey wire from the engine to the RPM input 6 Certain installations, see note below Rotax 503 Connect the grey wire from the engine to the RPM input 6 Certain installations, see note below Rotax 582 Connect the grey wire from the engine to the RPM input 6 Certain installations, see note below Rotax 618 Connect the grey wire from the engine to the RPM input 6 Certain installations, see note below Rotax 912 (S) Connect the rev counter wires (blue/yellow and white/yellow). One of the two wires needs to be connected to ground (engine block) and the other to the RPM input. 1 Insert ballast resistor Rotax 914 Connect the rev counter wires (blue/yellow and white/yellow). One of the two wires needs to be connected to ground (engine block) and the other to the RPM input. 1 Insert ballast resistor Engines with magnetos UMA Tach Sensor T1A9-1 (Slick) T1A9-2 (Bendix) 1 pulse per revolution on 4-cylinder, 2 pole magnetos Certain installations Connect the red or orange/white wire to 12V, the 1.5 pulses per revolution black or blue/white and braid to ground. Connect on 6-cylinder, 2 pole magnetos the white (signal) to the RPM input HKS engine Connect the orange wire from the CDI unit to the RPM input 1 no MTH engine Connect the green wire from ignition sensor to the RPM input 2 no Werner engine Connect the yellow wire from ignition sensor to the RPM input 2 no UL Power Connect the ECU pin 9 to the RPM input 2 no Note: Some Rotax engines may require that a 220 ohm ballast resistor is fitted between the rpm input and the ground terminal. This resistor should be fitted if you cannot obtain stable RPM throughout the range regardless of any setting of the rpm counter sensitivity adjustment. Vega EMS-1 Operating Manual Page 50 11.3.4 Connecting the EMS-1 to automotive engines Conventional contact breaker ignition system Use the tacho line if your system has such a signal Connect rev counter input of EMS-1 to this line. Ensure you have a connection from the EMS-1 ground to the engine block. Connect rev counter input of EMS-1 to this line. Ensure you have a connection from the EMS-1 ground to the engine block. Electronic ignition system with conventional ignition coil Vega EMS-1 Operating Manual Page 51 11.3.5 Various other pickup / sensor installation possibilities Hall-effect sensor Typical hall effect sensor installation detects the passing of a magnet suitably fixed to prop flanges or shafts. Gear tooth sensor The gear tooth sensor is a popular pickup used on the pre-rotation gear of a gyro plane (rotor speed indication). Optical Reflective Pickup The optical reflective pickup can provide a simple means of contactless RPM sensing in difficult installations. Vega EMS-1 Operating Manual Page 52 11.4 Temperature senders VDO Resistive senders: The EMS-1 supports the VDO 120ºC and 150ºC thermistor automotive senders. The internal pull up resistor dip switch for the resistive temperature sender input must be in the “ON” position. MGL NTC resistive senders: A suitable sender with the same thread used by Rotax can be obtained from MGL Avionics (manufacturer Echlin). The internal pull up resistor dip switch for the resistive temperature sender input must be in the “ON” position. Most NTC senders require a single wire connected as shown in the installation diagram. The sender is grounded via the engine block. The ground terminal of the gauge input should be connected to the engine block. Some NTC senders have two wires. In this case it is not required that the sender housing itself is connected to the engine block. Wire the second wire to the reference ground terminal. MGL Precision senders (On Semiconductors LM335): These are senders containing a semiconductor temperature measurement device. They can be used for water or oil temperature. These senders are available in two types: an encapsulated version with a brass housing suitable for Rotax thread; a second uncommitted version contains only the sensor itself. This can be conveniently mounted inside an existing sender housing after you remove the original insides of the sender. This is intended to give you a solution for unusual or difficult to obtain senders. The internal pull up resistor dip switch for the resistive temperature sender input must be in the “ON” position. Connect the green wire to ground and the red wire to the analog input channel. Westach Resistive senders: The EMS-1 supports the Westach 399 series senders. The internal pull up resistor dip switch for the resistive temperature sender input must be in the “ON” position. User defined senders: The EMS-1 has a user sender calibration feature that can be customized for senders not listed above. 11.5 Pressure senders VDO Resistive senders: The EMS-1 includes linearisation curves for the VDO 2, 5 and 10 Bar pressure senders. The internal pull up resistor dip switch for the resistive pressure sender input must be in the “ON” position. 4-20mA Pressure Senders: The EMS-1 supports the 4-20mA pressure sender as used in Rotax 912/914 engines The supplied 100Ohm 1/4W resistor must be connected across the analog input channel to ground. The internal pull up resistor dip switch for the 4-20mA current sender input must be in the “OFF” position. Only channel 1 to 3 can be used for the 4-20mA pressure sender if using the internal measurement circuit and only the OILP, AUX 1 and AUX 2 can be used if using the external RDAC. Voltage output pressure senders: The EMS-1 includes linearisation curves for the UMA N/T 1EU07, N/T 1EU35, N/T 1EU70, N/T 1EU70A, N/T 1EU100 and N/T 1EU150 pressure senders. The EMS-1 also has a 0.5-4.5V sender selection. The internal pull up resistor dip switch for the 0.5-4.5V sender input must be in the “OFF” position. User defined senders: The EMS-1 has a user sender calibration feature that can be customized for Resistive, 420mA as well as Voltage output senders. Vega EMS-1 Operating Manual Page 53 11.5.1 UMA Voltage output pressure sender Pinout: White/Orange: +12Vdc White: Signal White/Blue: Ground Shield: Ground 11.5.2 ROTAX 912/914 4-20mA Pressure sender The sensor cable is approximately 3m long and has 3 leads. The black lead is not to be connected and has no function. The Red lead from the sensor has to be connected to the positive bus via a fuse or circuit breaker . The white lead (Output signal) has to be connected directly to the EMS-1 analog input channel. The supplied 100Ohm 1/4W resistor must be connected across the analog input channel to ground. The internal pull up resistor dip switch for the 4-20mA current sender input must be in the “OFF” position. Vega EMS-1 Operating Manual Page 54 11.6 Fuel flow sender installation The fuel flow sender allows the EMS-1 to provide instantaneous readout of hourly fuel usage. Please note that the installation of the fuel Flow sender should be done in such a fashion that dirt or debris from the fuel tank cannot lodge inside the flow sender. These will not block you fuel flow but may lead to the impeller inside the sender jamming. It is usually sufficient to mount the flow sender AFTER the fuel filter but before the fuel pump. It is a good idea to provide a small reservoir such as a primer bulb between the flow sender and the fuel pump. As indicated in the recommended installation drawing, it can be of advantage to install the flow sender in such a fashion that the inlet points slightly down and the outlet points slightly up. This prevents vapor from forming a bubble inside the flow sender. We strongly recommend mounting the flow sender in such a fashion that the impeller rests on only one bearing. This is achieved if you mount the sender such that the surface with the arrow faces upwards. Mounting the sender like this results in the best performance at low flow rates as only very little friction is present. The flow sender is delivered with a small jet that can be installed in the flow sender inlet. Installation of this jet is recommended for engines with fuel flow rates lower than about 30 Litres per hour. This would apply to most small two and four stroke engines. The EMS-1 is shipped with the fuel flow sender calibration set for the jet installed. In a good installation you can expect about +/- 3% maximum flow reading error with this factor. You can calibrate the flow sender yourself to a higher degree of accuracy if you so desire. Recommended procedure to calibrate the fuel flow sender: Note: You must disable the fuel level sender if you have one installed, and enable the calculated fuel level sender. 1. Fill your tank exactly to a known level (for example 50 Litres). 2. Set your fuel level to 50 Litres. 3. Fly your aircraft for a period that you know will use approximately 20 Litres of fuel. The exact fuel burn is not important; just burn about 20 Litres of your fuel. At the end of your flight the instrument should give you a reading of how much fuel you have left – the reading should be about 30 Litres left. 4. Now place your aircraft in exactly the same position that you used when you first filled the tank and refill the tank to 50 Litres using a measuring jug. You should find that you need 20 Litres of fuel to refill to 50 Litres. 5. If you find that the instrument under or over reads the fuel used, you should perform a simple adjustment of the fuel flow sender calibration factor. Example: Actual fuel used: 21.5 Litres, FF-5 fuel burn calculated 29.7 Litres left in the tank. This means the EMS-1 measured 5029.7 = 20.3 Litres. We are under reading by 1.2 Litres. Default calibration factor in Fuel setup menu = 7000. Let the corrected calibration factor be X. X = (20.3 * 7000) / 21.5 X = 6609.3 The closest setting you can enter as factor is 6609. Enter it into the unit and you are done! Repeat the above procedure to verify that your flow sender is now reading correctly. Please note: Before you calibrate the flow sender ensure there are no problems with your installation. We find the senders are very accurate if everything is installed and working properly. If your fuel burn indication is out by a large amount you have a problem that you should not attempt to fix by fiddling with the calibration factor! Please ensure that no fuel vapor can be trapped inside the sender housing in the form of bubbles. Due to the low fuel flow rates the bubbles will prevent the tiny impeller from turning freely, you can verify the turning of the impeller. You should notice three dark spots that are just visible in the inside of the fuel flow sender. These are small magnets that are attached to the impeller. With fuel flowing you should see the magnets turning. The best defense against vapor bubbles is to install the flow sender in such a way that the bubbles can escape. The easiest way is to point the outlet slightly upwards and the inlet (with the jet) slightly Vega EMS-1 Operating Manual Page 55 downwards. Another possible problem is the fuel sender jet. When you install it, do not damage it. Use a drill bit of suitable diameter (5.5mm) to push the jet all the way, the opening of the jet must be just in front of the impeller. YOU NEED TO APPLY SOME FORCE TO INSERT THE JET ALL THE WAY (about 24mm). THE JET MUST BE LOCATED RIGHT IN FRONT OF THE IMPELLOR. YOU CANNOT PUSH THE JET TOO FAR. Using other Flow Senders It is quite possible to use flow senders other than the MGL Avionics fuel flow sender. In this case ensure that the sender outputs a 5V TTL square wave or a similar signal. The EMS-1 interface electronics will adapt to a variety of different voltages and pulse shapes as it contains a Schmitt-trigger input stage. The calibration factor can be entered in a wide range making the unit particularly suited to other flow senders. The supply output terminal for the sender provides a positive, regulated 5 volt output. This may be used to power the flow sender provided the sender will not draw more than 40 mA of current. Should your sender require a higher voltage or more current, you must supply the sender from a different power source. Exceeding the rating on the MGL Avionics fuel flow sender supply terminal can affect the operation on the unit negatively or even damage it. Some senders require a pull-up resistor to the 12V supply line. We find most installations of these senders require a 4K7 pull-up resistor. Recommended Calibration Factors for the MGL Avionics dual range flow sender: With jet installed = 7000. Recommended for flow rates below 30 Litres/hour maximum Without jet installed = 1330. Recommended for flow rates above 30 Litres/hour Please refer to the leaflet included with the flow sender for information on pressure drop versus flow rate, wetted materials etc. It is your responsibility to ensure that the flow sender used is compatible with the fuels you intend using. We have found the MGL Avionics fuel flow sender to be very compatible with automotive fuels used in South Africa, many of which contain methanol. 100LL AVGAS also appears not to harm the sender in any way. We have exposed a sender continuously to our automotive fuels for the duration of two years without any noticeable ill effect on the sender. However, despite this MGL Avionics or its appointed agents cannot assume responsibility for any incident or damage, even loss of life by whatsoever cause connected with the fuel flow sender or the EMS-1 instrument. Usage of this or other senders is your own sole responsibility. If you do not agree with the above statement you must not use the fuel flow sender. Note to Pilots: (Even though this is the installation manual) You must always have a visual indication of the fuel level available, either by means of a sight glass, direct tank observation or a known, reliable secondary fuel level gauge. As pilot in command of an aircraft it is your responsibility to ensure that you have sufficient fuel to reach your intended destination. Always ensure that you have a generous amount of reserve fuel and never use your reserve fuel except in an emergency if it is unavoidable. Vega EMS-1 Operating Manual Page 56 11.7 Fuel level senders The EMS-1 permits the connection of standard automotive fuel level senders. These senders can be obtained at automotive spares outlets at reasonable cost. When you choose a float level sender, ensure that you select a model that is sturdy and promises reliable and long lifetime. In particular, select a model that does not have any metal parts that can rust. The EMS-1 can interface to a large variety of these fuel level senders. It does not matter if the sender resistance increases or decreases with the fuel level as long as it changes. The calibration procedure outlined in the “Fuel Level Setup” section describes in great detail the procedure to follow. In essence, the calibration procedure will measure the resistance of the fuel level sender at various fuel levels and then work out the readings in between those known settings. Typical fuel level senders that can be used with the EMS-1 have resistance ranges in the region of 100 ohms to 500 ohms. Connect the flange of the sender to the negative supply (ground). You can connect capacitive senders as well. These generally come in two types: The first emulates a normal resistive probe and is simple to connect and use as a result. The second type has a voltage level output. These can be used if the voltage can be set to a range of about 0-5V. Higher voltage levels will result in the instrument assuming a problem. We recommend using VDO float based fuel level senders. Capacitive types can be used provided they have a voltage output not exceeding 5V. The analog inputs have an internal 1K5 resistor pull-up to +5V. Please note that capacitive senders may exhibit large errors as they are very sensitive to the composition of the fuel used. We do not recommend using capacitive senders with automotive fuels for this reason. Note: It might be advantageous to disable the internal pull up resistor via the analog dipswitch and provide a calculated external resistor connected between the analog channel input and the +5V sensor power. This can lead to an increased ADC resolution providing a better fuel tank indication. The internal pull up resistor in the EMS-1 is 1k5 ohms. Safety Hazard! Please take note: Be careful when installing fuel level senders into fuel tanks. Ensure that the fuel tank is completely empty when you proceed with the installation. Ensure that the fuel tank is well ventilated and does not contain any fuel vapors – these are highly explosive when mixed with air. Ensure that at all times the ground connection (the connection of the fuel level sender mounting flange) is securely connected to the aircraft frame (in case of a metal frame) and to the negative terminal of the battery. In addition the negative terminal of the battery must at all times be connected to the supply ground terminal of the EMS-1. Please note – this wiring is critical and must never break in flight. It would be possible to create electrical sparks in the fuel tank if your wiring is faulty or incorrect. The consequences of this can be imagined. This has nothing to do with the EMS-1 itself but is a general hazard for any automotive fuel level sender installation. If you have no experience with electrical wiring, PLEASE delegate the task to a qualified automobile electrician or electronics technician. If you need to remove the EMS-1, please first disconnect and secure the fuel level sender wire before disconnecting anything else. Vega EMS-1 Operating Manual Page 57 11.8 Analog Channels Dipswitch settings Use a small screwdriver to change the switch direction. Dipswitch 1 2 3 4 Function Analog Input Channel 1 Pull up resistor (On=Enable, OFF=Disable) Analog Input Channel 2 Pull up resistor (On=Enable, OFF=Disable) Analog Input Channel 3 Pull up resistor (On=Enable, OFF=Disable) Enables a high frequency filter in the RPM 1 signal path (On=Enable, OFF=Disable) 11.9 Manifold Pressure Installation (RDAC Only) Standard polyester or silicon hosing with an inside diameter of 3-4mm is suitable as pressure hosing. For high pressure applications the hose should be clamped onto the connector to avoid it slipping off due to expansion of the hose. For applications where a pressure leak may prove troublesome, such as a typical engine manifold application, a restrictor valve should be inserted into the hose so that only very little gas leakage will be present in a case of failure or if the instrument is removed with the engine running. In the case of the 912 and 914 Rotax engines there is a pipe connecting the two manifolds where this connection can be made. 11.10 Closed Loop Current Sensor The MGL Avionics magnetic closed loop current sensor provides a 0.5V to 4.5Vdc output voltage which is proportional to a 50A bi-directional input current. Advantages of closed loop current sensors over conventional current measurements techniques is that they provide the highest accuracy, are ideal for noisy electrical environments and they provide complete electrical isolation f rom the current carrying conductor. Please see the MGL Avionics Closed Loop Current Sensor manual for connection information Vega EMS-1 Operating Manual Page 58 11.11 Senders that are grounded in the engine block Single wire senders require that their mounting arrangement (thread) has a very good electrical contact with the engine block. Avoid the use of any sealant or tapes as these may cause a bad electrical connection. Further to this it is very important that the engine block has a good electrical connection to the negative supply terminal of the EMS-1. Any voltage drop caused by other equipment on the ground wire will cause incorrect readings. The best way to ensure a good connection is to wire a single connection between the EMS-1 ground terminal (any of these terminals) and the engine block. Do not wire this anywhere else and do not allow any other equipment to use this wire as a current return path. 11.12 External RDAC (Remote Data Acquisition) Connection (Optional) The EMS-1 can use an external RDAC unit as the source for the analog signals. Using an external RDAC may be beneficial as it will reduce the wiring from the engine compartment to the cockpit. Only the CAN High and CAN Low connections need to be made between the RDAC unit and the EMS-1 in order for this to work. Select “RDAC” for the data source in the various setup menus if using the external RDAC option. The RDAC unit is optional and is purchased separately. EMS-1 Analog Channel 1 = RDAC OILT EMS-1 Analog Channel 2 = RDAC OILP EMS-1 Analog Channel 3 = RDAC AUX1 EMS-1 Analog Channel 4 = RDAC AUX2 Vega EMS-1 Operating Manual Page 59 11.13 Cable connections Main connector (D15HD connector: Unit Female, Cable Male) D15HD Pin 1 Color Red 2 Black 3 White/Blue Stripe White/Black Stripe Green Yellow 4 5 6 7 9 10 11 12 13 14 15 Orange Red/White Stripe Grey Blue Purple Pink Brown White Function 8-30Vdc power via power switch / circuit breaker and fuse. Ground. Connect the ground to the engine block, and the engine block to the battery negative. Do not connect the EMS-1 ground directly to the battery negative. This must be routed via the engine block. RS232 Transmit data (Firmware upgrading) RS232 Receive data (Firmware upgrading) Analog Input 2 RPM 2 Input (Rotor RPM / TTL signal sensor sources) / Fuel flow Input Analog Input 1 Analog Input 4 Analog Input 3 RPM 1 Input (Engine RPM) CAN Low (Used for optional external RDAC) CAN High (Used for optional external RDAC) +5Vdc Power out Sensor power Alarm Output (Open collector) Thermocouple (EGT/CHT) connector (D9 connector: Unit Male, Cable Female) In case of MGL Avionics K-Type probes + = Yellow probe lead, - = Red probe lead D9 Female Pin 5 4 3 2 9 8 7 6 Color Blue Orange Green Purple Red Brown Yellow White Function TC Channel 1 + TC Channel 2 + TC Channel 3 + TC Channel 4 + TC Channel 1 TC Channel 2 TC Channel 3 TC Channel 4 - Vega EMS-1 Operating Manual 12 Dimensions Page 60 Vega EMS-1 Operating Manual Page 61 13 Cleaning The unit should not be cleaned with any abrasive substances. The screen is very sensitive to certain cleaning materials and should only be cleaned using a clean, damp cloth. Warning: The EMS-1 is not waterproof, serious damage could occur if the unit is exposed to water and/or spray jets. 14 Warranty This product carries a warranty for a period of one year from date of purchase against faulty workmanship or defective materials, provided there is no evidence that the unit has been mishandled or misused. Warranty is limited to the replacement of faulty components and includes the cost of labor. Shipping costs are for the account of the purchaser. Note: Product warranty excludes damages caused by unprotected, unsuitable or incorrectly wired electrical supplies and or sensors, and damage caused by inductive loads. 15 Disclaimer Operation of this instrument is the sole responsibility of the purchaser of the unit. The user must make themselves familiar with the operation of this instrument and the effect of any possible failure or malfunction. This instrument is not certified by the FAA. Fitting of this instrument to certified aircraft is subject to the rules and conditions pertaining to such in your country. Please check with your local aviation authorities if in doubt. This instrument is intended for ultralight, microlight, home built and experimental aircraft. Operation of this instrument is the sole responsibility of the pilot in command (PIC) of the aircraft. This person must be proficient and carry a valid and relevant pilot’s license. This person has to make themselves familiar with the operation of this instrument and the effect of any possible failure or malfunction. Under no circumstances does the manufacturer condone usage of this instrument for IFR flights. IMPORTANT NOTICE: You must make your own determination if the products sold by MGL Avionics are safe and effective for your intended applications. MGL Avionics makes no representations or warranties as to either the suitability of any of the products we sell as to your particular application or the compatibility of any of the products we sell with other products you may buy from us or anywhere else, and we disclaim any warranties or representations that may otherwise arise by law. Also, we offer no specific advice on how to install any of the products we sell other than passing along anything that may have been provided to us by the manufacturer or other issues. If you are in need of further information or guidance, please turn to the manufacturer, FAA Advisory Circulars and guidance materials, the Experimental Aircraft Association, or other reputable sources. Continuing development sometimes necessitates specification changes without notice. Vega EMS-1 Operating Manual Page 62 Other instruments in the Stratomaster Vega series AHRS-1 AHRS-3 ALT-5 ASI-4 ASI-4HS ASV-1 ASV-1HS EMS-1 FF-4 INFO-1 MAG-1 MAP-3 RPM-1 TC-4 TP-3 Artificial Horizon and Magnetic Compass Indicator Self contained Artificial Horizon and Magnetic Compass Indicator Altimeter and Vertical Speed Indicator (VSI) Airspeed Indicator (ASI) Airspeed Indicator (ASI High Speed) Altimeter, Airspeed (ASI) and Vertical Speed Indicator (VSI) Altimeter, Airspeed (ASI High Speed) and Vertical Speed Indicator (VSI) Engine Monitoring System Fuel Computer Information Display (G-Force meter, UTC and Local Time, Slip Indicator, Outside Air Temperature (OAT), Battery Voltage, Current and charge display, Flight Timer & Flight Log, Stopwatch, Countdown Timer and Alarm) Magnetic Compass Indicator Manifold Pressure and RPM Indicator Universal Engine / Rotor RPM Indicator 4 Channel Thermocouple (EGT/CHT) Indicator 4 Channel Universal Analog Input (Pressure/Temperature/Current/Volts) Indicator ">

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Key features
- Color display
- Multi-parameter monitoring
- External RDAC interface
- Compact size
- Sunlight readable
- Engine leaning & cruise mode
- Magneto check
- Flight timer
- Maintenance timer
- Alarm functions
Frequently asked questions
The EMS-1 is a universal engine monitor, so it can be used with various types of engines. It directly interfaces with UL Power engines via the RS232 port and can be integrated with other engines using the optional external RDAC unit.
Yes, the EMS-1 can measure single fuel flow and display it in Liters/hour or Gallons/hour via the RPM2 input. You can use either a fuel flow sender or, for injectors, select the high or low side fired fuel injector.
The EMS-1 has a comprehensive menu system for configuring various parameters. You can select the number of EGT/CHT channels, configure alarm thresholds, calibrate sensors, and customize other options based on your engine type and installation.