ULPOWER UL350 Operating Manual

Also see for UL260: Operating manual

ULPOWER UL350 Operating Manual Manual pdf 11 page image

Operating Manual ULPOWER UL260,UL350,UL390,UL520M0310: OM 260 - 520A01 Revision No: 00 Date: 2019-04-01 Page: 9 of 22Check lightThe ECU contains a table of data, referred to as a ‘3-dimensional fuel map’. The map itself containsthe mixture and timing control for operations up to 18.000 ft, based on data received from fivedifferent senders1.CPS -Crank Shaft Position Sensor/RPM ,This sensor gives info on the crankshaft position, the RPM and position of each cylinder’spiston and valves. This allows the ECU to calculate when to trigger the sparkplugs/advance/retard the engine for smooth running.2.TPS – Throttle Position Sensorgives info on the %age power setting and also to know if ‘accelerating’3.OTS – Oil Temperature SensorThis lets the ECU know whether it is a hot start or a cold start and to manage the engineaccordingly with fuel to air ratio (rich or lean) and advance/retard. Based on this input, theECU can automatically adjust the mixture to ensure easy starting and smooth running untilthe engine is at operating temperature4.ATS – Airbox/inlet manifold Air temperature sensor5.APS – Air Pressure Sensor(air pressure is taken near the air filter and linked via a hose to the ECU where the sensor ishoused).Ambient Air Pressure and AirBox(manifold) temperature By knowing the ambient airpressure and temperature it is possible to calculate the air density to determine the correctamount of fuel to add for the ‘right mixture’If one of the above-mentioned sensors fails or becomes disconnected, the engine will continue torun, but not as efficiently as it will be using ‘default values’. A warning light (check light) willcome on providing increased pilot awareness.If the warning is intermittent, it may indicate a poor or loose connection or a break in a wire.It is worth noting that if the ECU’s goes into error mode you may find an increase in fuel burn.When back on the ground, you can use the ULRead diagnostic software to find out what caused thecheck light to come up. Fix the problem before next flight.NoteIt is very important that your check light is installed in accordance with the installation manual.You can test this by switching power “ON” to the ECU; If installed correctly the check light willcome up for 2 seconds. You can do an additional test by disconnecting one of the sensors; if theinstallation is ok, the check light will come up.