SkyView System Installation Guide - Dynon Avionics

SV-EMS-220/221 Installation and Configurationresistors, they need not be exactly 30 kΩ. Additionally, both 1/4W and 1/2W resistors areacceptable to use.If, after setting the PULS/REV R and L values as described in the EngineInformation Section, you see higher than expected RPM or unstable values, youmay need to increase the series resistance to as high as 150 kΩ.Trigger Coil (Rotax 912, except 912 iS)The Rotax 912 engines have a 5 th trigger coil for the purposes of electrically monitoring revcounts. This trigger coil outputs to a two-wire harness. Connect either of the two wires toground; connect the other white wire to SV-EMS-220 Pin 32 (Standard RPM Left Input). If youobserve erratic tachometer readings or momentary “spikes” in the display - particularly athigher RPM – install a 60K resistor inline (in series) between the trigger coil and SV-EMS-220 Pin32, White/Green wire). Set Pulses / Revolution (PPR) to 1: SETUP MENU > EMS SETUP > ENGINEINFORMATION > PUL/REV (PIN C37 P32/34)Rotax 914The Rotax 914 uses a Turbo Control Unit (TCU), which provides an RPM output < 10V.Connect Pin 13 of the TCU to SV-EMS-220 Pin 34 (Low Voltage RPM Left Input).Connect Pin 26 of the TCU to any of Pins 3, 5, 13, 16, 17, or 30 (Ground).Do not install a resistor in the wires between the TCU and the SV-EMS-220.Set Pulses / Revolution (PPR) to 1: SETUP MENU > EMS SETUP > ENGINE INFORMATION >PUL/REV (PIN C37 P32/34)Alternator Wire (Jabiru)The most common tachometer pickoff location for Jabiru 2200 and 3300 engines is one of thealternator wires. Connect one of the two white alternator wires through a 1 amp fuse to SV-EMS-220 Pin 32 (Standard RPM Left Input). Set Pulses / Revolution (PPR):Jabiru 22000A – 5Jabriu 3300 w/3-phase alternator – 4Jabiru 3300 w/single-phase – 6SETUP MENU > EMS SETUP > ENGINE INFORMATION > PUL/REV (PIN C37 P32/34)Other Ignition SystemsThe SV-EMS-220/221’s Standard Voltage RPM inputs can read frequency-based RPM signals,provided the peak voltages goes at least 5.1 volts above ground, and crosses back down below2.0V relative to ground. If the peak voltage exceeds 50 volts, use the included 30 kΩ resistors asdescribed in the P-lead pickoff (Lycoming and Continental) Section above.For signals that have a peak voltage of 12V or lower —such as Light Speed ignition outputs—use the low voltage RPM inputs. These inputs require that the peak voltage goes at least 2.1volts above ground, and crosses back down below 0.8V relative to ground to be counted as apulse.SkyView System Installation Guide - Revision O 7-33