SV-EMS-220 Installation and Configuration
SkyView System Installation Guide - Revision K 7-29
as possible to the spot where you tap into the P-lead. This minimizes the length of cable
carrying high voltage spikes. Six-cylinder Lycoming engines sometimes need more inline
resistance to prevent false readings by the SV-EMS-220. If you supply your own resistors, they
need not be exactly 30 kΩ. Additionally, both 1/4W and 1/2W resistors are acceptable to use.
If, after setting the PULS/REV R and L values as described in the Engine
Information Section, you see higher than expected RPM or unstable values, you
may need to increase the series resistance to as high as 150 kΩ.
Trigger Coil (Rotax)
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 to the standard RPM Left input on the SV-EMS-220. If you observe
erratic tachometer readings or momentary “spikes” in the display - particularly at higher RPM –
a 60K resistor installed inline (in series) in this wire may help.
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 the
standard RPM Left input on the SV-EMS-220.
Digital Ignition and Other Pickoffs
The SV-EMS-220’s standard RPM inputs can read frequency-based RPM signals, provided the
peak voltage 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. Like the other methods above,
you must know the number of pulses per revolution for your RPM transducer.
Low Voltage RPM Inputs
If you have an RPM source that outputs frequency-based RPM signals that are smaller than 10
volts above ground—such as Light Speed ignition outputs—use the low voltage RPM inputs.
These inputs require that the peak voltage goes at least 2.1 volts above ground, and crosses
back down below 0.8V relative to ground to be counted as a pulse.
Manifold Pressure Sensor
The manifold pressure sensor is an
integral assembly consisting of three
pins, a rubber seal, and a connector
housing. Strip 3/16” insulation off the
ends of the three wires listed at right.
Slide the three rubber seals onto the
three wires and the pins onto the ends
of the wires. Crimp the 3 included pins
onto the ends of the wires, ensuring that
Table 33–Manifold Pressure Sensor Pins
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