SkyView System Installation Guide - Dynon Avionics

SV-EMS-220/221 Installation and ConfigurationEngine Sensor and Transducer InstallationThis section explains the steps required to install and connect all sensors and transducerssupplied by Dynon Avionics. Additionally, connection instructions are given for some sensorsand transducers that Dynon Avionics does not sell, like the tachometer, fuel level, flaps, trim,and contacts.All sensors and transducers must be properly defined, mapped, and configured asdescribed in the EMS Sensor Definitions, Mapping, and Settings Section of thisguide.Remember to configure the measurement units for your Engine Page as describedin the How to Configure Displayed Units Section.Engine Sensor Accuracy and GroundingIt is vitally important that all engine sensors, your Dynon SkyView display, your SV-EMS-220/221 module, and electrical system all share the same ground, and that there is virtually nomeasurable voltage between these grounds.Large currents flow between your alternator and the rest of your aircraft. The ground for thesecurrents is shared with your sensors. Because of the large currents involved, resistance ingrounds that cannot be seen with a simple multimeter can still lead to significant voltageoffsets. This can lead to errors in sensor readings.These large currents exist in other places in the aircraft as well, such as between the batteryground cable and its connection to the airframe, and along the grounding points for theavionics bus. It is important that all of these ground paths be appropriately sized for the loadsinvolved, and that the connections be clean, solid, and devoid of contamination.In particular, be sure to connect a ground wire between your engine block or avionics groundblock and any of the SV-EMS-220/221’s ground pins.Please note that running a ground wire from the EMS to the engine block may not entirely solvegrounding issue, as this adds just a small wire in parallel with another much larger wire, and theload will get transferred to this smaller wire, which itself is resistive due to its small size, andthus no real effect will be seen.Though dealing with grounding issues can be time consuming and frustrating, errors that areseen on your Dynon Engine Monitor are caused by points in the aircraft where there isinsufficient grounding. This can lead to weak starting, hot wires, and corrosion. Fixing theEngine Monitor readings by having a good ground will also lead to a healthier aircraft electricalsystem overall.7-28 SkyView System Installation Guide - Revision O