Dynon Avionics SkyView System Installation Guide - Manual (Page 151)

SV-EMS-220/221 Installation and Configuration
SkyView System Installation Guide – Revision S 7-39
If, after setting the PULS/REV R and L values as described in the Engine
Information Section, you see unstable RPM, you may need to increase the series
resistance. We recommend increasing the resistance in increments of
approximately 30 kΩ – approx. 30 kΩ, approx. 60 kΩ, approx. 90 kΩ, approx. 120
kΩ, and approx. 150 kΩ. Try each value in sequence. A higher resistance value is
not “better”, as too high a resistance can reduce the amplitude of the RPM signal
to the point where you may see no, or low, RPM.
Trigger Coil (Rotax 912, except 912 iS)
The Rotax 912 engines have a 5
th
trigger coil for the purposes of electrically monitoring rev
counts. This trigger coil outputs to a two-wire harness. Connect either of the two wires to
ground; connect the other white wire to SV-EMS-220 Pin 32 (Standard RPM Left Input). If you
observe erratic tachometer readings or momentary “spikes” in the display - particularly at
higher RPM – install a 60K resistor inline (in series) between the trigger coil and SV-EMS-220 Pin
32, White/Green wire). Set Pulses / Revolution (PPR) to 1: SETUP MENU > HARDWARE
CALIBRATION > EMS CALIBRATION > TACHOMETER CALIBRATION > PUL/REV (C37 P32/34)
Rotax 914
The 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 SETUP MENU > HARDWARE CALIBRATION > EMS CALIBRATION
> TACHOMETER CALIBRATION > PUL/REV (C37 P32/34)
Alternator Wire (Jabiru)
The most common tachometer pickoff location for Jabiru 2200 and 3300 engines is one of the
alternator 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 – 5
Jabiru 3300 w/3-phase alternator – 4
Jabiru 3300 w/single-phase – 6
SETUP MENU > HARDWARE CALIBRATION > EMS CALIBRATION > TACHOMETER CALIBRATION >
PUL/REV (C37 P32/34)
Other Ignition Systems
The 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 below
2.0V relative to ground. If the peak voltage exceeds 50 volts, use the included 30 kΩ resistors as
described 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 2.1